UNITED STATES
SECURITIES AND EXCHANGE COMMISSIONWashington, D.C. 20549

FORM 10-K

|(Mark One) |                                                                                         
|---------- | ----------------------------------------------------------------------------------------
|ý          | ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934    
|           | For the fiscal year ended December 29, 2007                                             
|o          | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|           | For the transition period
from                              to                          

Commission File Number
000-50080

SI International, Inc.(Exact Name of Registrant as Specified in Its Charter)

|Delaware(State of Other Jurisdiction of
Incorporation or Organization)            |  | 52-2127278(I.R.S. Employer
Identification No.)
|--------------------------------------------------------------------------------- |  | ----------------------------------------------
|12012 Sunset Hills Road, Reston, Virginia(Address of Principal Executive Offices) |  | 20190-5869(Zip Code)                          

Registrant's Telephone Number, Including Area Code:(703) 234-7000

Securities to be registered pursuant to Section 12(b) of the Act:

Title of Each Class

Name of Each Exchange on Which RegisteredCommon Stock, $0.01 par value per share

Nasdaq Stock Market LLC


Securities
to be registered pursuant to Section 12(g) of the Act:

None(Title of Class)

Indicate
by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities
Act. Yes o    No ý

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the
Act. Yes o    No ý

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15 (d) of the Securities
Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days. Yes ý    No o

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be
contained, to the best of registrant's knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to
this Form 10-K. o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting
company. See definition of "accelerated filer," "large accelerated filer" and "smaller reporting company" in Rule 12b-2 of the Exchange Act. (Check one):

|Large accelerated filer o |  | Accelerated filer ý |  | Non-accelerated filer o |  | Smaller reporting company o
|------------------------- |  | ------------------- |  | ----------------------- |  | ---------------------------

Indicate
by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the
Act). Yes o    No ý

The aggregate market value of SI International, Inc. Common Stock held by non-affiliates of the registrant as of June 30, 2007 was
$417,249,801.

As
of February 29, 2008, there were 13,202,414 shares of SI International, Inc. Common Stock outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Certain portions of the definitive proxy statement to be used in connection with SI International, Inc.'s annual meeting of stockholders, which is expected
to be filed not later than 120 days after the registrant's fiscal year ended December 29, 2007, will be incorporated by reference into Part III of this
Form 10-K.



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SI INTERNATIONAL, INC.  FORM 10-K

|PART I   |  |                                                                                                                  |  |   
|-------- |  | ---------------------------------------------------------------------------------------------------------------- |  | --
|ITEM 1   |  | Business                                                                                                         |  | 3 
|ITEM 1A  |  | Risk Factors                                                                                                     |  | 17
|ITEM 1B  |  | Unresolved Staff Comments                                                                                        |  | 31
|ITEM 2   |  | Properties                                                                                                       |  | 31
|ITEM 3   |  | Legal Proceedings                                                                                                |  | 32
|ITEM 4   |  | Submission of Matters to a Vote of Security Holders                                                              |  | 32
|PART II  |  |                                                                                                                  |  |   
|ITEM 5   |  | Market for the Company's Common Equity and Related Stockholder Matters and Issuer Purchases of Equity Securities |  | 33
|ITEM 6   |  | Selected Financial Data                                                                                          |  | 35
|ITEM 7   |  | Management's Discussion and Analysis of Financial Condition and Results of Operations                            |  | 36
|ITEM 7A  |  | Quantitative and Qualitative Disclosures About Market Risk                                                       |  | 47
|ITEM 8   |  | Financial Statements and Supplementary Data                                                                      |  | 48
|ITEM 9   |  | Changes in and Disagreements with Accountants on Accounting and Financial Disclosure                             |  | 48
|ITEM 9A  |  | Controls and Procedures                                                                                          |  | 48
|ITEM 9B  |  | Other Information                                                                                                |  | 50
|PART III |  |                                                                                                                  |  |   
|ITEM 10  |  | Directors, Executive Officers and Corporate Governance                                                           |  | 51
|ITEM 11  |  | Executive Compensation                                                                                           |  | 51
|ITEM 12  |  | Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters                   |  | 51
|ITEM 13  |  | Certain Relationships and Related Transactions, and Director Independence                                        |  | 52
|ITEM 14  |  | Principal Accountant Fees and Services                                                                           |  | 52
|PART IV  |  |                                                                                                                  |  |   
|ITEM 15  |  | Exhibits and Financial Statement Schedules                                                                       |  | 52
|         |  | Signatures                                                                                                       |  | 53

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BUSINESS INFORMATION

Throughout this document, we occasionally distinguish SI International, Inc., as a company separate from its subsidiaries, and
SI International, Inc., as a company combined with its subsidiaries. In order to clarify which entity we are referring to in various discussions, we use the terms
"SI International, Inc." and "SI International" to refer to SI International, Inc. without its subsidiaries. All other references, including "SI," "the Company,"
"we" and "us" refer to SI International and its subsidiaries.

Some of the statements under Item 1. "Business," Item 7. "Management's Discussion and Analysis of Financial Condition and Results of Operations,"
and elsewhere in this Form 10-K constitute forward looking statements. These statements involve known and unknown risks, uncertainties, and other factors that may cause our actual
results, levels of activity, performance or achievements to be materially different from any future results, levels of activity, performance or achievements expressed or implied by such forward
looking statements. In some cases, you can identify these statements by forward looking words such as "anticipate," "believe," "could," "estimate," "expect," "intend," "may," "plan," "potential,"
"should," "will," and "would" or similar words. You should read statements that contain these words carefully because they discuss our future expectations, contain projections of our future results of
operations or of our financial position, or state other forward looking information. We believe that it is important to communicate our future expectations to our investors. However, there may be
events in the future that we are not able to predict accurately or control. The factors listed in the section captioned Item 1A. "Risk Factors," as well as any cautionary language in this
Form 10-K, provide examples of risks, uncertainties, and events that may cause our actual results to differ materially from the expectations we describe in our forward looking
statements.

Although we believe that the expectations reflected in the forward looking statements are reasonable, we cannot guarantee future results, levels of activity,
performance or achievements. You should not place undue reliance on these forward looking statements, which apply only as of the date of this Form 10-K. Subsequent events and
developments may cause our views to change. However, while we may elect to update these forward looking statements at some point in the future, we specifically disclaim any obligation to do
so.

PART I

Item 1.    Business:

SI International, Inc. was organized as a Delaware corporation under the name of "SI International, Incorporated" on October 14, 1998.
SI International conducts operations both in its own name and through subsidiaries, each of which is located in the U.S. but some of which have international operations.

Overview

We are a provider of mission critical information services, technology and network solutions primarily to the Federal Government. Our business is guided by our
experienced team of eight executive officers and over thirty other corporate officers who manage and are responsible for successfully growing our business. As of the end of fiscal year 2007, we
employed approximately 4,500 employees. Approximately 78% of our employees hold Federal Government security clearances or have passed National Agency Checks.

Approximately
13% of our employees hold Top Secret security clearances. A significant portion of our employees who hold Top Secret security clearances also hold Sensitive Compartmental
Information clearances, which permit us to bid on highly classified projects.

Our
broad set of contract vehicles gives us extensive reach and enables us to deliver a full range of our services and solutions to the Federal Government. The strength of our service
offerings and

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information
technology expertise allows us to maintain substantial relationships with clients, some of whom have been clients of ours, or of one of our acquired businesses, for over 20 years.
In fiscal 2007 and fiscal 2006, we derived approximately 79% and 80%, respectively, of our revenue from contracts on which we acted as prime contractor. Acting as a prime contractor provides us with
stronger client relationships, as well as the visibility and access to new work, that are not available when acting as a subcontractor. Our total backlog as of December 29, 2007 was
approximately $1.45 billion, of which approximately $180 million was funded. See "Backlog" for a discussion of how we calculate backlog.

The Federal Government technology services market

The ongoing transformation of the Federal Government's information systems and communication networks is creating an increase in its demand for information
technology, or IT, services. INPUT, an independent market research firm, believes overall IT spending will continue to grow as a critical foundation for federal service delivery over the next five
years. Federal agencies have been put on notice that a more rigorous demand for program results will be the hallmark of the federal IT business climate. According to INPUT, the federal market demand
for vendor-furnished information systems and services is projected to increase by $20.4 billion from $65.2 billion in government fiscal 2007 to $85.6 billion in government fiscal
2012, a compound annual growth rate of approximately 5.6% over the five-year period.

We
expect that the Federal Government's need for the types of IT services that we provide will continue to grow in the foreseeable future, as a result of the high priority placed by the
Federal Government on the transformation of its IT programs. INPUT forecasts that the percentage of IT spending that is contracted out by the Federal Government will reach a high of over 86% of total
IT spending in government fiscal 2012.

We
believe the following industry trends will also continue to drive the Federal Government technology services market:

Continued focus on mission-critical initiatives

Since the events of September 11, 2001, the Federal Government has made the transformation of its IT infrastructure a major priority. According to INPUT,
the Federal Government IT services "commercial"
segment, which is comprised of outsourcing, professional services, systems integration and processing services, is projected to grow from $27.3 billion in government fiscal 2007 to
$36.9 billion in government fiscal 2012, representing a projected compounded annual growth rate of 6.2%.

Increased spending on homeland security and intelligence

In the wake of the terrorist attacks on September 11, 2001, there has been an increased emphasis on homeland security, intelligence and national defense,
including protecting critical infrastructure. Information sharing and border security initiatives will drive Department of Homeland Security IT spending growth over the next several years. According
to INPUT, the total addressable IT budget for the Department of Homeland Security is projected to grow from $4.5 billion in government fiscal 2007 to $6.1 billion in government fiscal
2012, representing a compound annual growth rate of 6.1%. During the 2007-2012 forecast period, INPUT expects to see additional federal funding for homeland security and terrorism
prevention to cover nuclear detection, border protection, and high-tech screening capabilities. Although the total amount to be spent for intelligence applications is classified, based on
available information, INPUT estimated that the addressable Federal Government IT spending in the intelligence community may have been as much as $9.4 billion in government fiscal 2007, and may
grow to $14.0 billion by government fiscal 2012 representing a compounded annual growth rate of 8.3%. System integration professional services from the intelligence community is expected to
grow from

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$1.6 billion
in 2007 to $2.5 billion in 2012, at a compounded annual growth rate of 9.6%. We believe that there will continue to be increases in spending on federal intelligence
activities, which are expected to represent significant additional opportunities for us.

Implementing defense transformation

According to INPUT, for the Department of Defense, or DoD to meet the goals of defense transformation over the next five years, information technology will be
leveraged to allow decision makers to act quickly. Ensuring timely and trusted information is available where needed is the cornerstone of defense transformation. Even as DoD focuses on military
operations in Iraq and Afghanistan, it must prepare for future challenges and conflicts through technological transformations. During the 2007-2012 forecast period, DoD will launch efforts
to develop an information sharing environment. Agency spending in IT security will also grow as the DoD implements secure information sharing and collaboration schemas to drive efficiency and speed of
delivery. The addressable IT spending, which is the amount that is contracted out, for the U.S. Air Force, our single largest client in terms of revenue is projected by INPUT to grow from
$5.8 billion in government fiscal 2007 to $7.8 billion in government fiscal 2012, representing a compounded annual growth rate of 6.0%.

Enterprise architectural planning initiatives continue to be emphasized

Office of Management and Budget, or OMB, is directing agencies to develop Enterprise Architectures to reflect where the business will be in the next three to five
years. Beginning with the fiscal 2009 budget submission, agencies are expected to adhere to a more structured way of characterizing government-wide projects that can be mapped to the
Federal Enterprise Architecture Reference models. Systems consolidation, security, and information sharing top the list of technology factors that are shaping the federal information technology market
and influencing enterprise architecture development. Implementing an enterprise architecture strategy requires a deep understanding of business processes and systems. Departments need help to perform
the analysis and design necessary for a successful implementation and will look to IT service providers to assist them in these efforts. According to INPUT, the professional services market, which is
comprised of software development, design and consulting, education and training, and the professional services associated with systems integration, is projected to grow from $13.3 billion in
government fiscal 2007 to $17.6 billion in government fiscal 2012, representing a projected compounded annual growth rate of 5.9%. Over the past few years, many major government programs,
modernization, and reform initiatives, including homeland security solutions, have depended on the use of professional services. INPUT expects this trend to continue over the next several years.

Increased Federal Government reliance on outsourcing

The most important industry trend for our business has been the Federal Government's increasing use of service providers to execute support processes and
functions that were traditionally performed by Federal Government employees. The current administration has made competitive sourcing a major initiative of its management agenda. According to the
President's Management Agenda, which was issued in 2001 and for which progress reports continue to be issued, nearly half of all Federal Government employees perform tasks that are available in the
commercial marketplace. According to INPUT, outsourcing through the use of outside providers to provide Federal Government services is projected to be the fastest growing market, increasing from
$13.8 billion in government fiscal 2007 to $19.0 billion in government fiscal 2012, representing a projected compounded annual growth rate of 6.6%. INPUT expects that DoD budgets will
continue to grow over the next several governmental fiscal years and anticipates that each of the defense agencies will move toward outsourcing more of the IT functions that are not core to the
war-fighting mission. Business process outsourcing, or BPO, is a relationship in which a contractor is responsible for performing an entire business operations function,

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including
the information systems outsourcing that supports it. INPUT projects that Federal Government BPO spending will grow from $598 million in government fiscal 2007 to $894 million
in government fiscal 2012, which represents a compounded annual growth rate of 8.4%.

The
Federal Government has also simplified the process for procurement of contractor provided services, which has contributed to the growth in the use of outsourcing. Through changes
that began with the Federal Acquisition Streamlining Act of 1994, or FASA 94, the Federal Government has developed a variety of accelerated contracting methods. Federal governmental agencies have
increasingly been able to rely on multiple contracting vehicles to procure needed services in an expedient manner.

We
believe that the rapid pace of technological innovations and the Federal Government's increasing reliance on complex IT infrastructure, combined with a decline in the size of the
Federal Government workforce, make it increasingly difficult for many governmental agencies to operate and upgrade their IT systems. We expect that these trends, when combined with the increasing
simplicity of procurement, which are described in greater detail below, will contribute to the Federal Government's increased use of service providers to fulfill a larger portion of its IT
responsibilities, and we believe that we will continue to gain new engagements to the extent that the Federal Government increases its reliance on outsourcing for its IT needs.



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Our Core Strengths

We strategically built our business to respond specifically to the federal IT marketplace. We believe that our core strengths position us to respond to the
long-term trends and changing demands of our market.

Our Experienced Management Team

Our President and Chief Executive Officer, or CEO, S. Bradford Antle, who has been with us since 1999 and has served as our CEO since September 2005, brings more
than 27 years of management experience in our industry. Mr. Antle also serves as a member of the Board of Directors. Ray J. Oleson, who founded our company in 1998 and served as our
Chief Executive Officer from 1998 through September 2005, continues to serve as Executive Chairman of the Board.

To
further support our growth, our nine business units are incorporated into the Strategic Programs Group, the IT Solutions Group, and the Mission Services Group. Each of these Business
Groups is headed by an Executive Vice President, who reports to Mr. Antle.

Mike
Becraft is the Executive Vice President of the Mission Services Group. He is responsible for a major portion of work with the Department of Homeland Security, Department of State,
and U.S. Army. Mr. Becraft has more than 39 years of Federal civilian government and military experience. He joined us in 2003 as Senior Vice President of Homeland Security.

Harry
Gatanas is the Executive Vice President of the Strategic Programs Group, where he oversees a significant portion of our business with the DoD and the Intelligence community.
Mr. Gatanas is a retired U.S. Army general with over 34 years of experience in the military and intelligence community, including serving as the Acquisition Executive at the National
Security Agency, and as the Commanding General of the U.S. Army White Sands Missile Range.

Marylynn
Stowers is the Executive Vice President of the IT Solutions Group. She oversees a significant portion of business that addresses federal IT modernization. Ms. Stowers has
more than 26 years of experience providing IT services to the Federal Government, such as Department of Homeland Security, Department of State, Department of Treasury, Internal Revenue Service,
and the Intelligence community.

Our Corporate Culture

Our corporate culture is based on respect for clients, personnel, business partners and management. We view our commitment to this culture of respect as a
cornerstone of our company. We believe that our culture helps us build the relationships necessary to gain an in-depth understanding of our clients' needs, business practices and IT and
network systems. In addition, we believe our culture is a factor in helping our employee turnover rate remain low compared to other companies in our industry, in helping us to maintain client domain
knowledge and in providing consistent service to our clients. Further, we believe that our commitment to respect, combined with quality of performance, is an important factor in retaining clients and
winning new referrals.

Focus on Information Technology Services

We deliver a full spectrum of IT services and solutions that address challenges common to many Federal Government agencies and commercial companies. Our
capabilities position us to capitalize on the Federal Government's increasing demand for IT services. We integrate our technical areas of expertise into comprehensive solutions covering IT
applications, systems engineering, network and telecommunications engineering and outsourcing. Our focus on end-to-end IT solutions allows us to

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leverage
our knowledge and experience to provide best practices across many Federal Government agencies and industries. Our key focus areas are:



In
providing IT and network solutions to our customers, our skilled employees use their advanced technological training and extensive experience to implement our
state-of-the-practice solutions.

Knowledge of Federal Government Contracting and Federal Agencies

We believe that our in-depth knowledge of Federal Government contracting and the governmental agencies we serve and their procurement processes allows
us to provide better solutions for our clients' needs. Our experienced team of executive officers and senior managers brings to us their many years of experience and extensive contacts in the
industry. They provide us with an understanding of our clients' needs and procedures, as well as valuable mission-specific information. We believe that the insight provided by our officers and
managers allows us to design solutions that are responsive to our clients' mission-critical needs.

Successful Integration of Acquired Businesses

We believe that a critical component of our success is our ability to identify, acquire and integrate companies that build or expand our suite of services to
serve our clients' needs more effectively. We have substantial experience acquiring and successfully integrating acquired entities. We believe that this experience provides a basis for our disciplined
approach to identifying acquisition candidates and integrating acquired companies. By integrating corporate infrastructures such as marketing and sales, accounting, human resources and internal
networks, we can save the expense of redundant functions. In addition, by integrating operations, we establish a corporate-wide mission which can reduce internal competition and promote
the cross-selling of newly augmented skill sets to increase our client base.

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Within
the 15-month period from January 1999 through March 2000, we identified, acquired and integrated four federal IT companies with aggregate revenues of approximately
$105 million, measured for the 12 months prior to their respective acquisition dates. In January 2004, we acquired Matcom International Corporation, or Matcom; in December 2004, we
acquired Bridge Technology Corporation, or Bridge; in February 2005, we acquired Shenandoah Electronic Intelligence, Inc., or SEI; in February 2006, we acquired Zen Technology, Inc., or
Zen, and in June 2007, we acquired LOGTEC, Inc., or LOGTEC. We successfully integrated each of these acquisitions into our organization; and, we built and expanded our services and solutions
capabilities and our client relationships. We applied our disciplined acquisition processes to integrate the acquired companies and successfully grew these businesses.

Our Growth Strategy

We have implemented the following strategies in order to reach our goal of becoming a leading provider of IT and network solutions to our clients:



Our Areas of Practice

We provide IT and network solutions in the following eight practice areas to supplement the needs of our clients in the areas of Defense Transformation, Homeland
Defense, Mission Critical Outsourcing and Federal IT Modernization.



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Clients

We provide our services primarily to Federal Government clients such as the U.S. Air Force (including particularly the Air Force Space Command and Air Force
Materiel Command), the U.S. Army, U.S. Navy, the Department of State, the Department of Homeland Security, Department of Agriculture, Department of Energy, Federal Retirement Thrift Investment Board,
and the defense intelligence community. In fiscal 2007, we derived approximately 99% of our total revenue from Federal Governmental agencies and approximately 1% of our total revenue from commercial
clients.

We
derived approximately 46% of our total revenue in fiscal 2007 and 47% of our total revenue in fiscal 2006 from the DoD and the Intelligence community. In fiscal years 2007 and 2006,
work we performed under our Command, Control, Communications, Computer, Intelligence, Information, Technology, Surveillance, and Reconnaissance, or C4I2TSR, contract vehicle represented approximately
17% and 21%, respectively, of our total revenue. The primary customer under the C4I2TSR contract vehicle is the U.S. Air Force Space Command, however, other Federal government entities typically
exercising independent decision making and funding authority use C4I2TSR. No other contract vehicle (exclusive of GSA multiple award schedules) accounted for in excess of 10% of our total revenues in
fiscal years 2007 and 2006. We derived approximately 53% of our total revenue in fiscal 2007 and 52% of our total revenue in fiscal 2006 from federal civilian government agencies. Our largest clients
on the civilian side of the government are the Department of Homeland Security, Department of State and the Federal Retirement Thrift Investment Board. Fiscal 2007 revenue from civilian agencies
organically grew by approximately 14% when compared to fiscal 2006. We believe our contract base is well diversified. In fiscal 2007 and fiscal 2006, we derived approximately 79% and 80%,
respectively, of our revenue from contracts on which we acted as prime contractor and derived approximately 21% and 20%, respectively, of our revenue from contracts on which we acted as a
subcontractor.

We
often subcontract portions of work to be performed under a contract or task order under which we are the prime contractor. Approximately 20% of our total revenue for fiscal 2007 and
19% of our total revenue for fiscal 2006 was generated by work performed by subcontractors. The subcontractors are sometimes responsible for critical portions of the contracted services. Our
subcontracting arrangements typically specify that all terms of the primary contract pass down to the subcontractor. We are not dependent upon any one subcontractor or group of subcontractors to
provide a substantial degree of work for us. In addition, it is typical that a subcontractor on one engagement may be a competitor or a client in other situations. We believe that cultivating good
relationships with our subcontractors is necessary to maintain our competitive position as well as to facilitate meeting performance obligations under our contracts.

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Backlog

Backlog is our estimate of the amount of revenue we expect to realize over the remaining life of awarded contracts and task orders we have in hand as of the
measurement date. Our total backlog consists of funded and unfunded backlog. We define funded backlog as estimated future revenue under government contracts and task orders for which funding has been
appropriated by Congress and authorized for expenditure by the applicable agency, plus our estimate of the future revenue we expect to realize from our commercial contracts. Unfunded backlog is the
difference between total backlog and funded backlog. Unfunded backlog reflects our estimate of future revenue under awarded government contracts and task orders for which either funding has not yet
been appropriated or expenditure has not yet been authorized. Our total backlog does not include estimates of revenue from government-wide acquisition contracts, or GWAC contracts, or
General Services Administration, or GSA, schedules beyond awarded or funded task orders, but our unfunded backlog does include estimates of revenue beyond awarded or funded task orders for other types
of indefinite delivery, indefinite quantity, or ID/IQ, contracts, such as our contract with the U.S. Air Force Space Command.

Our
total backlog as of December 29, 2007 was approximately $1.45 billion, of which approximately $180 million was funded. There can be no assurance that we will
receive the amounts we have included in our backlog or that we will ultimately recognize the full amount of our funded backlog as of December 29, 2007.

We
believe that backlog is not necessarily indicative of the future revenue that we will actually receive from contract awards that are included in calculating our backlog. We assess the
potential value of contracts for purposes of backlog based upon several subjective factors. These subjective factors include our judgments regarding historical trends (i.e., how much revenue we
have received from similar contracts in the past), competition (i.e., how likely are we to successfully keep all parts of the work to be performed under the contract) and budget availability
(i.e., how likely is it that the entire contract will receive the necessary funding). If we do not accurately assess each of these factors, or if we do not include all of the variables that
affect the revenue that we recognize from our contracts, the potential value of our contracts, and accordingly, our backlog, will not reflect the actual revenue received from contracts and task
orders. As a result, there can be no assurance that we will receive amounts included in our backlog or that monies will be appropriated by Congress or otherwise made available to finance contracts and
task orders included in our backlog. Many factors that affect the scheduling of projects could alter the actual timing of revenue on projects included in backlog. There is always the possibility that
the contracts could be adjusted or cancelled. We adjust our backlog on a quarterly basis to reflect modifications to or renewals of existing contracts, awards of new contracts or approvals of
expenditures. See Item 1A. "Risk FactorsThe calculation of our backlog is subject to numerous uncertainties, and we may not receive the full amounts of revenue estimated under the
contracts included in our backlog, which could reduce our revenue in future periods."

Employees

As of December 29, 2007, we had approximately 4,500 employees. Approximately 78% of our employees hold Federal Government security clearances or have
passed National Agency Checks. Approximately 13% of our employees hold Top Secret security clearances. A significant portion of our employees who hold Top Secret security clearances also hold
Sensitive Compartmental Information clearances, which permit us to bid on highly classified projects. We have no unionized employees and do not have any collective bargaining agreements. However,
current contracts or contracts that we may pursue may require us to have unionized employees. We believe we have a good relationship with our employees.

In
addition to attracting and retaining qualified technical personnel, we believe that our success will depend on the continued employment of our executive and senior management team and
its ability

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to
generate new business and execute projects successfully. We believe that the personal reputations of our management team members and the business relationships between individual members of our
management team and governmental officials involved in the procurement process and related areas are critical elements of obtaining and maintaining client engagements in our industry, particularly
with agencies performing classified operations. To create and maintain these client relationships, identify potential business opportunities and establish our reputation among our current and
potential clients, we depend on our senior management team. The loss of any of our senior executives could cause us to lose client relationships or new business opportunities, which could materially
adversely affect our business.

Competition

We compete for contracts in highly competitive markets against a large number of companies both large and small. Because of the large number of companies
competing in these markets, we do not repeatedly compete against the same companies. We may team with other companies to perform work under contracts when we feel that our combined resources may
create a competitive advantage. However, our competitors may compete more effectively than we can for various reasons, including that they are larger than us, have greater financial and other
resources, have better or more extensive relationships with governmental officials involved in the procurement process, or have greater brand or name recognition.

As
a result of the diverse requirements of the Federal Government and our commercial clients, we frequently form teams with the companies in our markets in order to compete for large
procurements, while bidding against them in other situations.

In
each of our practice areas, we generally bid against companies of varying sizes and specialties, from small businesses to multi-billion dollar corporations. Because of the current
industry trend toward consolidation, some of these companies may emerge better able to compete with us. Therefore, it is essential that we differentiate ourselves from these companies. We believe that
our technical abilities, client relationships, past performance, cost containment, reputation and ability to provide quality personnel give us a strong presence in the markets we serve. In addition,
we believe that our culture of respect for and commitment to our clients and business partners greatly aids our business. While we believe these factors help to set us apart from other companies in
our markets, we may not be able to continue to maintain our competitive position, as new companies enter the marketplace and alliances and consolidations among competitors emerge. Some companies in
our markets have longer operating histories, greater financial and technological capabilities, greater brand or name recognition and/or larger client bases than we have.

Government Contracting and Regulatory Processes

For fiscal 2007, approximately 99% of our revenue was derived from work performed under Federal Government contracts. The government contracting process differs
in many ways from commercial contracting, and involves a high degree of Federal Government regulation and oversight.

Historically,
agencies of the Federal Government wishing to procure services from contractors have been required to prepare a request for proposal, known as an RFP, or some similar form
of solicitation. The RFP is typically an extensive document describing the services desired and the terms and conditions that form the final agreement, including the criteria the soliciting agency
will use to select the service provider. Interested parties submit proposals in response to the RFP, which the agency evaluates, often requesting additional information and multiple discussions with
offerors prior to final award of the contract.

Over
the years, the Federal Government has taken steps to streamline the procurement process. Federal Governmental agencies are now more likely to use flexible contract vehicles that
permit a

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number
of firms to compete for specific orders. The General Services Administration Multiple Award Schedule Program, or GSA MAS Program, is an example of a flexible contract vehicle employed by the
Federal Government. Under the GSA MAS Program, GSA contracts with multiple vendors to provide goods and services, at predetermined prices, to specified authorized buyers. GSA schedules are listings of
services and products, along with their respective prices, offered by approved contractors. The schedules are maintained by the GSA for use by any federal agency or other authorized entity. A
contractor must successfully complete a pre-qualification process in order to be selected by the GSA for inclusion of the contractor's goods or services on a GSA Schedule. When an agency
selects services under a GSA schedule contract, the soliciting agency, or the GSA on its behalf, conducts a bidding process, limited to qualified GSA schedule contractors. The process typically
involves substantially less time and cost than the historical, non-GSA bidding process.

In
addition to the GSA MAS Program, we also hold other ID/IQ contracts with other individual agencies, which are generally known as task order contracts. These are essentially umbrella
contracts that set forth the basic terms and conditions under which the agency may order goods and services from one, and in some cases, more than one, contractor. Contractors undergo a competitive
pre-selection process to become eligible to perform work under ID/IQ contracts. A procuring agency then issues task orders for goods or services to be performed or provided under a
contract. From time to time we are also a party to GWACs, which are ID/IQ contracts that permit the aggregation of multiple agencies' requirements in a single contract, in order to encourage
contractors to offer the best possible prices and to reduce the costs associated with multiple acquisitions.

When
task orders are issued under multiple award ID/IQ contracts or GWACs, each awardee typically has an opportunity to be considered for the task order. The agency desiring contract
services may conduct a competition among the interested awardees, resulting in the issuance of a task order to a single contractor. These contracts have increased competition and pricing pressure by
concentrating work under fewer contracts, and requiring competition both prior to the initial award of the contract and throughout the term of the contract in order to obtain task orders for the
services we provide, requiring that we make sustained post-award marketing efforts to realize revenue under each such contract. In our experience, the key factors in competing successfully
for these task orders are technical merit, cost, relevant past performance considerations and client trust. However, even if we are qualified to work on a particular new contract or a contract subject
to renewal, we might not be awarded business because of the Federal Government's policy and practice of procuring goods and services from multiple contractors in order to maintain a diverse base of
contractors. In addition, ID/IQ contracts and GWACs do not obligate the Federal Government to purchase goods or services above the minimum levels set forth in the contract.

For
single-award large scale contracts, such as those targeted by our Major Program initiative, interested contractors submit information indicating their desire to perform the required
services. The agency then solicits competitive proposals or bids from qualified contractors by providing them with a formal RFP or similar solicitation. The RFP typically describes the desired
services, terms and conditions, and evaluation criteria the agency will use. Offerors then submit proposals in response to
the RFP, and the agency evaluates the proposals and makes the award determination. Agencies are encouraged to award contracts on a "best value" basis. This means that the contractor selected for the
award should, in the agency's judgment, provide the greatest overall benefit in response to the requirement, including technical merit, cost and relevant past performance considerations. The entire
acquisition process can sometimes take a year or more.

The
government contracts for which we compete typically have multiple year terms, and if we are unable to win a particular contract, we generally will be foreclosed from competing again
for that contract until its expiration several years later. In addition, upon the expiration of a contract, if the client requires further services of the type provided by the contract, there is
frequently a competitive rebidding process.

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The
competitive process presents a number of risks, which are described in greater detail under Item 1A. Risk Factors below.

Laws and Regulations Affecting Our Business

Federal Government contracts are subject to a number of federal laws and regulations, including the Federal Acquisition Regulation, or FAR, and Cost Accounting
Standards. These statutes and regulations contain several rules that may affect us significantly.

The
Anti-Deficiency Act prohibits Federal Government employees from committing government funds, by contract or otherwise, in excess or in advance of appropriations, unless
authorized by a specific statute. Since Congress usually appropriates funds on a fiscal year basis, many of our contracts are funded by the applicable agency annually as Congress makes appropriations
for future fiscal years. In addition, since funds are often allocated to agencies by the OMB, many of our contracts are incrementally funded.

Disappointed
bidders and contractors excluded from competing for government contracts and task orders may submit a protest to a contracting officer or the GAO within time limits
specified under FAR and GAO bid protest rules. The U.S. Court of Federal Claims also has bid protest jurisdiction. Performance under a contract being protested may be suspended while the protest is
pending, and in cases where the contract is found to have been improperly awarded, the contract may be terminated.

Certain
FAR clauses, such as the Limitation of Cost and Limitation of Funds clauses, limit the Federal Government's liability for expenditures or obligations beyond those authorized by
the applicable contract. In many cases, contracts are awarded for only one year with a number of successive option years (in many cases, four). Agencies are not obligated to exercise these option
years, but in our experience most renewal options under our contracts have been exercised. In addition, certain FAR clauses allow the Federal Government to terminate contracts for convenience
(i.e., at will), although the Federal Government is obligated to pay for costs incurred.

Larger
contracts may also be subject to the Truth in Negotiations Act and Cost Accounting Standards. The Truth in Negotiations Act requires us to provide current, accurate and complete
cost or pricing data in connection with the negotiation of a contract, modification or task order that is not subject to full and open competition or other exceptions to the Act. Cost Accounting
Standards are applicable to certain contracts and require the contractor to apply consistent accounting practices and comply with specific cost accounting criteria. The FAR "Contract Cost Principles
and Procedures" sets forth the rules regarding the allocability and allowability of costs incurred in connection with Federal Government contracts.

The
FAR restricts government contractors from participating in procurements when there is an Organizational Conflict of Interest, or OCI, and establishes rules for avoiding, mitigating
and neutralizing conflicts of interest in the issuance of contracts by the Federal Government. Virtually all government contracts, including ours, are subject to the OCI rules. An OCI may arise
because the nature of the work to be performed by a contractor has the potential, absent some restriction on future activities, to result in an unfair competitive advantage to the contractor or impair
the contractor's objectivity in performing the contract or providing assistance or advice to the Federal Government. The government contracting officer is responsible for resolving any significant
potential OCIs before a contract award is made. Federal Government contractors have an obligation to manage and, if necessary, report an OCI to the contracting officer. We have a
company-wide policy regarding care in the acceptance of and compliance with contractual OCI provisions, which includes awareness training programs and coordination and reporting systems.
We review new contracts and task orders at the time we receive them for potential OCI issues. Accordingly, we believe that as a result of the systems we have in place, our backlog will not be affected
by OCI issues.

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Our
books and records are subject to audit by the Defense Contract Audit Agency, or DCAA, and other governmental audit agencies to ensure that the costs and hourly rates for which we
invoice the Federal Government under cost reimbursable and time and materials contracts are in compliance with the Cost Principles, Cost Accounting Standards and FAR invoicing regulations. Each fiscal
year, we must submit final cost data to the Federal Government indicating our actual costs incurred for the prior year, exclusive of certain costs that are not recoverable by Federal Government
contractors. This data is audited, and subject to adjustments by the auditing agency based upon established guidance, which may affect our recovery on cost reimbursable contracts for prior fiscal
years. These audits may also result in assessment of penalties, interest costs and, in extreme cases, debarment. The Federal
Government retains a portion of the fee earned by us under cost reimbursable contracts until contract completion and audit by the DCAA. Audits of our business units by the DCAA have been completed for
all fiscal years through 2004 without material adjustments. In the opinion of management, the audits for other fiscal years through fiscal year 2007 will not result in adjustments that would have a
material adverse effect on our financial position or results of operations; however, future material adjustments are possible.

Our
conduct and performance is also subject to the False Claims Act. The False Claims Act prohibits contractors from knowingly submitting false or fraudulent claims to the Federal
Government. We have established standards of conduct for our employees and a reporting mechanism that any of our employees can use to report inappropriate or illegal activities.

From
time to time we may engage in activities that require us to comply with the various U.S. Government export control laws and regulations administered by the U.S. Department of State,
U.S. Department of Commerce, U.S. Treasury Office of Foreign Assets Control, and the Bureau of Customs and Border Protection. We have dedicated personnel assigned to maintain and coordinate our
compliance activities in this area.

Copies
of our Annual Report on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, and amendments to those
reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended ("Exchange Act"), are available free of charge on the Investor Relations section
of our website atwww.si-intl.comas soon as reasonably practicable after we electronically file the material with, or furnish the material
to, the Securities and Exchange Commission, or SEC.

You
may obtain a printed copy of any of the foregoing materials from us by writing to us at SI International, Inc., 12012 Sunset Hills Road, Suite 800, Reston,
Virginia 20190, Attention: Investor Relations.

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Item 1A.    Risk Factors

Risks Related to Our Industry

We depend on contracts with the Federal Government for most of our revenue, and our business would be seriously harmed if the government ceased doing business with us or
significantly decreased the amount of business it does with us.

We derived approximately 99% of our total revenue in both fiscal 2007 and in fiscal 2006 from Federal Government contracts, either as a prime contractor or a
subcontractor. This includes 45.5% and 46.6% of our total revenue in fiscal 2007 and in fiscal 2006, respectively, that we derived, either as a prime contractor or a subcontractor, from contracts with
agencies of the DoD and Intelligence community. We expect that we will continue to derive most of our revenue for the foreseeable future from work performed under Federal Government contracts. If we
were suspended or otherwise prohibited from contracting with the Federal Government generally, or with any significant agency of the DoD or the Intelligence community, or if our reputation or
relationship with the Federal Government or any significant agency of the DoD or the Intelligence community were impaired, or if any of the foregoing otherwise ceased doing business with us or
significantly decreased the amount of business it does with us, our business, prospects, financial condition and operating results would be materially adversely affected.

The
following chart provides certain information regarding contracts (exclusive of GSA multiple award schedules) or individual task orders (inclusive of task and delivery orders issued
on GSA multiple
award schedules) that represented in excess of 10% of our total revenues for fiscal years 2007 and 2006:

|                                                                                                                                         |  |                              |  | Percent of Revenues in |  |      | 
|---------------------------------------------------------------------------------------------------------------------------------------- |  | ---------------------------- |  | ---------------------- |  | ---- | 
|
|
|Command, Control, Communications, Computer, Intelligence, Information, Technology, Surveillance, and Reconnaissance,or C4I2TSR, contract |  | U.S. Air Force Space Command |  | 17.1                   |  | 21.4 | 

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Although
our contract with the Department of Homeland Security known as the Service Center Operations Team, or SCOT, contract represented less than 10% of our revenues in fiscal year
2007, it remained an important contract. The SCOT contract was recompeted during 2007, and if we had failed to win the SCOT contract recompete, or any of our other significant contracts, our business
would be materially and adversely affected. However, we were successful in winning an award under the SCOT successor contract called the Service Center Operations Support Services, or SCOSS, contract.
The SCOSS contract has a one-year base period and two one-year options with a ceiling value of approximately $225 million, if all options and award terms are exercised.

Our business could be adversely affected by changes in budgetary priorities of the Federal Government.

Because we derive a significant portion of our revenue from contracts with the Federal Government, we believe that the success and development of our business
will continue to depend on our successful participation in Federal Government contract programs. Changes in Federal Government budgetary priorities could directly affect our financial performance. A
significant decline in government expenditures, a shift of expenditures away from programs that call for the types of services that we provide, or a change in Federal Government contracting policies
could cause Federal Governmental

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agencies
to reduce their expenditures under contracts, to exercise their right to terminate contracts at any time without penalty, not to exercise options to extend contracts, or to delay or not enter
into new contracts. Any of those actions could seriously harm our business, prospects, financial condition or operating results. Moreover, although our contracts with governmental agencies often
contemplate that our services will be performed over a period of several years, Congress usually must approve funds for a given program each government fiscal year and may significantly reduce or
eliminate funding for a program. Significant reductions in these appropriations by Congress could have a material adverse effect on our business. Additional factors that could have a serious adverse
effect on our Federal Government contracting business include:



Our contracts with the Federal Government may be terminated or adversely modified prior to completion, which could adversely affect our business.

Federal Government contracts generally contain provisions, and are subject to laws and regulations, that give the Federal Government rights and remedies not
typically found in commercial contracts, including provisions permitting the Federal Government to:



The
Federal Government may terminate a contract with us either "for convenience" (for instance, due to a change in its perceived needs or its desire to consolidate work under another
contract) or if we default by failing to perform under the contract. If the Federal Government terminates a contract with us for convenience, we generally would be entitled to recover only our
incurred or committed costs, settlement expenses and profit on the work completed prior to termination. If the Federal Government terminates a contract with us based upon our default, we generally
would be denied any

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recovery
for undelivered work, and instead may be liable for excess costs incurred by the Federal Government in procuring undelivered items from an alternative source and other damages as authorized
by law. As is common with government contractors, we have experienced and continue to experience occasional performance issues under some of our contracts. We may in the future receive
show-cause or cure notices under contracts that, if not addressed to the Federal Government's satisfaction, could give the government the right to terminate those contracts for default or
to cease procuring our services under those contracts.

Our
Federal Government contracts typically have terms of one or more base years and one or more option years. Many of the option periods cover more than half of the contract's potential
term. Federal governmental agencies generally have the right not to exercise options to extend a contract. A decision to terminate or not to exercise options to extend our existing contracts could
have a material adverse effect on our business, prospects, financial condition and results of operations.

The
Company is required under certain contracts to provide a performance bond. The market for performance bonds was severely impacted by certain corporate failures in recent years, the
events of September 11, 2001, and continues to be impacted by general economic conditions. Consequently, the sureties for the Company's performance bond program may require additional
collateral to issue or renew performance bonds in support of certain contracts. The Company is also dependant on the financial health of the surety companies that it relies on to issue its performance
bonds. An inability to obtain new or renew existing performance bonds could result in limitations on the Company's ability to bid for new or renew existing contracts which could have a material
adverse effect on the Company's financial condition and results of operations.

Certain
of our Federal Government contracts also contain "organizational conflict of interest" clauses that could limit our ability to compete for certain related follow-on
contracts. For example, when we work on the design of a particular solution, we may be precluded from competing for the contract to install that solution. While we actively monitor our contracts to
avoid these conflicts, we cannot guarantee that we will be able to avoid all organizational conflict of interest issues.

If we fail to establish and maintain important relationships with government entities and agencies, our ability to successfully bid for new business may be adversely affected.

To develop new business opportunities, we primarily rely on establishing and maintaining relationships with various government entities and agencies. We may be
unable to successfully maintain our relationships with government entities and agencies, and any failure to do so could materially adversely affect our ability to compete successfully for new
business.

We derive significant revenue from contracts and task orders awarded through a competitive acquisition process. If we are unable to win new awards or successfully compete for
renewal contracts, our business and prospects may be adversely affected.

A significant number of our contracts and task orders with the Federal Government are awarded through a competitive process. We expect that much of the business
that we will seek in the foreseeable future will continue to be awarded through competitive bidding of new contracts and task orders and contracts subject to renewal. Recently, members of Congress and
administration officials have authorized changes to the procurement process intended to increase competition among suppliers to the Federal Government. Budgetary pressures and reforms in the
procurement process have caused many Federal Government clients to increasingly purchase goods and services through ID/IQ, contracts, including GSA contracts, and other GWACs. These contracts have
increased competition and pricing pressure by concentrating work under fewer contracts, and requiring competition both prior to the initial award of the contract and throughout the term of the
contract in order to obtain task orders for

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the
services we provide, requiring that we make sustained post-award marketing efforts to realize revenue under each such contract.

The
competitive process presents a number of risks, including the following:



The
government contracts for which we compete typically have multiple year terms, and if we are unable to win a particular contract, we generally will be foreclosed from competing again
for that contract until its expiration several years later. If we are unable to win new contract awards, our business and prospects will be adversely affected. In addition, upon the expiration of a
contract, if the client requires further services of the type provided by the contract, there is frequently a competitive rebidding process. There can be no assurance that we will win any particular
bid or recompetition bid, or that we will be able to replace business lost upon expiration or completion of a contract, and the termination or nonrenewal of any of our significant contracts or a
substantial portion of our other contracts could materially adversely affect our operating results.

Our business may suffer if our facilities or our employees are unable to obtain or retain the security clearances or other qualifications needed to perform services for our
clients.

Many of our Federal Government contracts require employees and facilities used in specific engagements to hold security clearances and to clear agency checks and
Defense Security Service, or
DSS, checks. Many of our contracts require us to employ personnel with specified levels of education, work experience and security clearances. Depending on the level of clearance, security clearances
can be difficult and time-consuming to obtain. If our employees or our facilities lose or are unable to obtain necessary security clearances or successfully clear necessary agency or DSS
checks, we may not be able to win new business and our existing clients could terminate their contracts with us or decide not to renew them. To the extent we cannot obtain or maintain the security
clearances necessary for our facilities or our employees working on a particular contract or to the extent our facilities or our employees do not successfully clear necessary agency checks or DSS
checks, we may not derive the revenue anticipated from the contract, and our operating results could be materially adversely affected.

We must comply with a variety of laws, regulations and procedures and our failure to comply could harm our operating results.

We must observe laws and regulations relating to the formation, administration and performance of Federal Government contracts which affect how we do business
with our clients and impose added

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costs
on our business. For example, the Federal Acquisition Regulation and the industrial security regulations of the DoD and related laws include provisions that:



Some
of our activities are subject to the export control laws and regulations administered by the Department of State, Department of Commerce, Treasury Office of Foreign Assets Control,
and the Bureau of Customs and Border Protection. Additionally, we are subject to industrial security regulations of the DoD and other federal agencies that are designed to safeguard against
foreigners' access to classified information. If we were to come under foreign ownership, control or influence, we could lose our facility security clearances, which could result in our Federal
Government customers terminating or deciding not to renew our contracts, and could impair our ability to obtain new contracts.

In
addition, our employees often must comply with procedures required by the specific agency for which work is being performed, such as time recordation or prohibition on removal of
materials from a location.

Our
failure to comply with applicable laws, regulations or procedures, including federal procurement regulations and regulations regarding the protection of classified information, could
result in contract termination, loss of security clearances, suspension or prohibition from contracting with the Federal Government, civil fines and damages and criminal prosecution and penalties, any
of which could materially adversely affect our business.

The Federal Government may revise its procurement or other practices in a manner adverse to us.

The Federal Government may revise its procurement practices or adopt new contracting rules and regulations, such as cost accounting standards. It could also adopt
new contracting methods relating to GSA contracts, GWACs or other government-wide contracts, or adopt new standards for contract awards intended to achieve certain social or other policy
objectives, such as establishing new set-aside programs for small or minority-owned businesses. In addition, the Federal Government may face restrictions from new legislation or
regulations, as well as pressure from government employees and their unions, on the nature and amount of services the Federal Government may obtain from private contractors. These changes could impair
our ability to obtain new contracts or contracts under which we currently perform when those contracts are put up for recompetition bids. Any new contracting methods could be costly or
administratively difficult for us to implement, and, as a result, could harm our operating results. For example, on June 30, 2007, a rule enacted by the U.S. Small Business Administration came
into effect concerning the small business certification that companies must provide under contract vehicles with small business set-asides. Under certain circumstances, this rule may
require companies to recertify as small businesses after they have been acquired by larger companies. A company that cannot recertify as a small business may experience decreased task orders awarded
under contract vehicles, including on contracts with small business set-aside requirements. Additionally, recent changes in the acquisition regulations concerning the process for awarding
time and materials and labor hour service contracts may make it more difficult to obtain such contracts in the future.

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Our contracts and administrative processes and systems are subject to audits and cost adjustments by the Federal Government, which could reduce our revenue, disrupt our
business or otherwise adversely affect our results of operations.

Federal governmental agencies, including the DCAA, routinely audit and investigate government contracts and government contractors' administrative processes and
systems. These agencies review our performance on contracts, pricing practices and cost structure. They also review our compliance with applicable laws, government regulations, policies and standards
and the adequacy of our internal control systems and policies, including our purchasing, property, estimating, compensation and management information systems. Any costs found to be improperly
allocated to a specific contract will not be reimbursed, and any such costs already reimbursed must be refunded. Moreover, if any of our administrative processes and systems are found not to comply
with the applicable requirements, we may be subjected to increased government scrutiny or required to obtain additional governmental approvals that could delay or otherwise adversely affect our
ability to compete for or perform contracts. Therefore, an unfavorable outcome to an audit by the DCAA or another government agency, such as the DSS, which verifies security compliance, could
materially adversely affect our competitive position and result in a substantial reduction of our revenues. If a government investigation uncovers improper or illegal activities, we may be subject to
civil and criminal penalties and administrative sanctions, including termination of contracts, forfeitures of profits, suspension of payments, fines and suspension or debarment from doing business
with the Federal Government. In addition, we could suffer serious harm to our reputation if allegations of impropriety were made against us.

Failure to maintain strong relationships with other government contractors could result in a decline in our revenue.

We derived approximately 21% of our total revenue in fiscal 2007 and 20% of our total revenue in fiscal 2006 from contracts under which we acted as a
subcontractor or from "teaming" arrangements in which we and other contractors bid together on particular contracts or programs. As a subcontractor or team member, we often lack control over
fulfillment of a contract, and poor performance on the contract could tarnish our reputation, even when we perform as required. We expect to continue to depend on relationships with other contractors
for a portion of our revenue in the foreseeable future. Moreover, our revenue and operating results could be materially adversely affected if any prime contractor or teammate chooses to offer a client
services of the type that we provide or if any prime contractor or teammate teams with other companies to independently provide those services.

The calculation of our backlog is subject to numerous uncertainties, and we may not receive the full amounts of revenue estimated under the contracts included in our backlog,
which could reduce our revenue in future periods.

Backlog is our estimate of the amount of revenue we expect to realize over the remaining life of the awarded contracts and task orders we have in hand as of the
measurement date. Our total backlog consists of funded and unfunded backlog. We define funded backlog as estimated future revenues under government contracts and task orders for which funding has been
appropriated by Congress and authorized for expenditure by the applicable agency under our contracts, plus estimated future revenues we expect to receive under signed purchase orders with commercial
clients. Unfunded backlog is the difference between total backlog and funded backlog. Unfunded backlog reflects our estimate of future revenues under awarded government contracts and task orders for
which either funding has not been appropriated or expenditures have not been authorized. Our total backlog does not include estimates of revenue from GWAC or GSA schedules beyond contract or task
order awards, but our unfunded backlog does include estimates of revenue beyond contract or task order awards for other types of ID/IQ contracts, including our C4I2TSR contract with the U.S. Air Force
Space Command.

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The
calculation of backlog is highly subjective and is subject to numerous uncertainties and estimates, and there can be no assurance that we will in fact receive the amounts we have
included in our backlog. Our assessment of a contract's potential value is based upon factors such as historical trends, competition and budget availability. In the case of contracts which may be
renewed at the option of the applicable agency, we generally calculate backlog by assuming that the agency will exercise all of its renewal options; however, the applicable agency may elect not to
exercise its renewal options. In addition, federal contracts typically are only partially funded at any point during their term, and all or some of the work to be performed under a contract may remain
unfunded unless and until Congress makes subsequent appropriations and the procuring agency allocates funding to the contract. Our estimate of the portion of backlog from which we expect to recognize
revenues in fiscal 2007 or any future period is likely to be inaccurate because the receipt and timing of any of these revenues is dependent upon subsequent appropriation and allocation of funding and
is subject to various contingencies, such as timing of task orders, many of which are beyond our control. In addition, we may never receive revenues from some of the engagements that are included in
our backlog and this risk is greater with respect to unfunded backlog.

The
actual receipt of revenues on engagements included in backlog may never occur or may change because a program schedule could change, the program could be canceled, the governmental
agency could elect not to exercise renewal options under a contract or could select other contractors to perform services, or a contract could be reduced, modified or terminated. We adjust our backlog
on a quarterly basis to reflect modifications to or renewals of existing contracts or task orders, awards of new contracts or task orders, or approvals of expenditures. Additionally, the maximum
contract value specified under a government contract or task order awarded to us is not necessarily indicative of the revenues that we will realize under that contract. We also derive revenues from
ID/IQ contracts, which
typically do not require the government to purchase a specific amount of goods or services under the contract other than a minimum quantity which is generally very small. If we fail to realize revenue
included in our backlog, our revenues and operating results for the then current fiscal year as well as future reporting periods could be materially adversely affected.

Loss of our GSA contracts or GWACs would impair our ability to attract new business.

We are a prime contractor under several GSA contracts and GWAC schedule contracts. We believe that our ability to continue to provide services under these
contracts will continue to be important to our business because of the multiple opportunities for new engagements each contract provides. If we were to lose our position as prime contractor on one or
more of these contracts, we could lose substantial revenues and our operating results could suffer. GSA contracts and other GWACs typically have a one or two-year initial term with
multiple options exercisable at the government client's discretion to extend the contract for one or more years. We cannot be assured that our government clients will continue to exercise the options
remaining on our current contracts, nor can we be assured that our future clients will exercise options on any contracts we may receive in the future.

If subcontractors on our prime contracts are able to secure positions as prime contractors, we may lose revenue.

For each of the past several years, as the GSA schedule contracts and GWACs have increasingly been used as contract vehicles, we have received substantial revenue
from government clients relating to work performed by other information technology providers acting as subcontractors to us. In some cases, companies that have not held GSA schedule contracts or
secured positions as prime contractors on GWACs have approached us in our capacity as a prime contractor, seeking to perform services as our subcontractor for a government client. Some of these
providers that are currently acting as subcontractors to us may in the future secure positions as prime contractors. If one or more of our current subcontractors are awarded prime contractor status in
the future, it could reduce or eliminate

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our
revenue for the work they were performing as subcontractors to us. Revenue derived from work performed by our subcontractors represented approximately 20% of our revenue for fiscal 2007 and 19% of
our revenue for fiscal 2006.

Risks Associated with International Operations

Our international business exposes us to additional risks including exchange rate fluctuations, foreign tax and legal regulations and political or economic instability that
could materially adversely affect our operating results.

In connection with providing services to our clients, we are sometimes required to engage in international operations (including international operations under
U.S. government contracts). Conducting international business subjects us to risks associated with operating in and selling to foreign countries, including:



To
the extent that our customers request us to provide services and support outside of the United States, these and other risks associated with international operations are likely to
increase. Although such risks have not harmed our operating results in the past, no assurance can be given that such risks will not materially adversely affect our operating results in the future.

Risks Related to Our Business

We may lose money or generate less than anticipated profits if we do not accurately estimate the cost of our performance under fixed price or time and materials contracts.

Some of our contracts require that we perform on a fixed price basis. We derived 37.7% of our total revenue in fiscal 2007 and 28.0% of our total revenue in
fiscal 2006 from fixed price contracts. A fixed price contract generally provides that we will receive a specified price for our performance under the contract, regardless of the cost to us of such
performance. This requires that we accurately estimate the cost that we will incur to perform our obligations under any contract at the time that we submit our proposal to the applicable government
agency. When making proposals for engagements on a fixed price basis, we rely on our estimates of costs and timing for completing the projects. These estimates

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are
subject to numerous variables and uncertainties, and there can be no assurance that the costs of performing under any fixed price contract will not exceed, perhaps substantially, our estimates.
Any increased or unexpected costs or unanticipated delays in connection with the performance of fixed price contracts, including costs and delays caused by factors outside our control, could make
these contracts less profitable than anticipated or could cause us to incur losses, which could be substantial, on these contracts. In the past, we have from time to time incurred losses on some fixed
price contracts and our profits on some fixed price contracts have been less than anticipated. Our operating results could be materially adversely affected if the actual costs of performing under
these contracts exceed our estimates.

Many
of our contracts are performed on a time and materials basis. A time and materials contract typically provides that we are paid a fixed hourly rate for direct labor costs expended
and reimbursed for allowable materials, costs and expenses. We derived 34.7% of our total revenues in fiscal 2007 and 40.2% of our total revenues for fiscal 2006 from time and materials contracts.
While time and materials contracts are generally subject to less uncertainty than fixed price contracts, to the extent that our actual labor costs are higher than the contract rates, we may lose money
on the contract. Additionally, recent changes in federal acquisition rules concerning the procedures for authorizing time and material and labor hour service contracts may affect our ability to obtain
time and material contracts in the future.

Our margins and operating results may suffer if cost reimbursable contracts increase as a percentage of our total government contracts.

In general, cost reimbursable contracts are the least profitable of our government contracts. Our cost reimbursable contracts generally provide for reimbursement
of costs, which are determined to be reasonable, allowable and allocable to the contract, as well as payment of a fee representing the profit margin negotiated between us and the contracting agency,
which may be fixed or performance based. Our time and materials contracts generally are more profitable than our cost reimbursable contracts. Cost reimbursable contracts contributed 27.6% and 31.8% of
our total revenues in fiscal 2007 and fiscal
2006, respectively. To the extent that cost reimbursable contracts represent an increased proportion of our total government contracts, our operating results could be materially adversely affected.

Our markets are highly competitive, and many of the companies we compete against have substantially greater resources.

We operate in highly competitive markets that include a large number of participants and involve intense competition to win contracts. Many of our competitors may
compete more effectively than we can because they are larger, have greater financial and other resources, have better or more extensive relationships with government officials involved in the
procurement process and have greater brand or name recognition. In order to stay competitive in our industry, we must attract and retain the highly skilled employees necessary to provide our services
and keep pace with changing technologies and client preferences. In addition, some of our competitors have established alliances or strategic relationships among themselves or with third parties in
order to increase their ability to address client needs. As a result, new competitors or alliances among competitors may emerge and compete more effectively than we can. There is also a significant
industry trend towards consolidation which may result in the emergence of larger companies that may be better able to compete with us. If we are unable to compete effectively, our business could be
materially adversely affected.

Our failure to attract and retain qualified employees, including our executive and senior management team, may adversely affect our business.

Our continued success depends to a substantial degree on our ability to recruit and retain the technically skilled personnel we need to serve our clients
effectively. Our business involves the

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development
of tailored technology solutions for our clients, a process that relies heavily upon the expertise and services of our employees. Competition for skilled personnel, especially those with
Top Secret or SCI clearances, in the information technology services industry is intense, and technology service companies often experience high attrition among their skilled employees. Recruiting and
training these employees requires substantial resources. Our failure to attract and retain technical personnel could increase our costs of performing our contracts, reduce our ability to meet our
clients' needs, limit our ability to win new business and constrain our ability to grow.

Certain
types of services are subject to the Service Contract Act and the Davis-Bacon Act. These Acts require that the contractor pay to all personnel assigned to the contract at least
the prevailing wage and fringe benefits, as established by and in accordance with the regulations promulgated by the Department of Labor. We have an established policy pursuant to which we evaluate
RFP's that include Service Contract Act and Davis-Bacon Act requirements and, in the event of an award to us, ensure our compliance with these requirements.

We may be affected by intellectual property infringement claims.

Our business operations may rely on intellectual property. Our employees develop some of the software solutions and other forms of intellectual property that we
use to provide IT solutions to our customers, but we also may license technology from other entities. Typically, under Federal Government contracts, our customers may claim rights in the intellectual
property we develop, making it impossible for us to prevent their future use of our intellectual property. We are and may in the future be subject to claims from our employees or third parties who
assert that certain software solutions and other forms of intellectual property that we used in delivering services and solutions to our customers infringe upon intellectual property rights of such
employees or third parties. If our vendors, employees or third parties assert claims that we or our customers are infringing on their intellectual property, we could incur substantial costs to defend
these claims. In addition, if any of these infringement claims are ultimately successful, we could be required to:



Employee misconduct could adversely affect our business and reputation, as well as expose us to other risks and losses.

While we endeavor to ensure that our employees adhere to all applicable laws and regulations governing their conduct, as well as to our polices, including our
Code of Ethics and Business Conduct, we may be unable to prevent our employees from engaging in misconduct, fraud or other improper activities that could adversely affect our business and reputation.
Although we take steps to ensure that our employees do not engage in misconduct, such steps may not be effective and we may incur substantial costs in investigating any allegations of misconduct in
addition to any penalties that may be imposed should misconduct be found to exist. Such penalties may include civil and/or criminal liability, loss of security clearances, or suspension and debarment
under various federal government laws and regulations such as those concerning procurement, the protection of classified information, export
compliance, the pricing of labor and other costs in government contracts, time card fraud and violations of the Anti-Kickback Act.

26

---



A substantial majority of our historical growth has been due to acquisitions and we may have difficulty identifying and executing future acquisitions on favorable terms, which
may adversely affect our results of operations and stock price.

A substantial majority of our historical growth was the result of acquisitions, and the selective pursuit of acquisitions remains one of our key growth
strategies. We cannot assure you that we will be able to identify and execute suitable acquisitions in the future on terms that are favorable to us, or at all.

We
may encounter other risks in executing our acquisition strategy, including:



In
connection with any future acquisitions, we may decide to consolidate the operations of any acquired business with our existing operations or to make other changes with respect to the
acquired business, which could result in special charges or other expenses. Our results of operations also may be adversely affected by expenses we incur in making acquisitions and, in the event that
any goodwill resulting from
present or future acquisitions is found to be impaired, by goodwill impairment charges. As of December 29, 2007, we had approximately $265.5 million of goodwill resulting from
acquisitions on our balance sheet and, to the extent we make future acquisitions, the amount of goodwill could increase, perhaps substantially. Any of the businesses we acquire may also have
liabilities or adverse operating issues.

In
addition, our ability to make future acquisitions may require us to obtain additional financing and we may be materially adversely affected if we cannot obtain additional financing
for any future acquisitions. To the extent that we seek to acquire other businesses in exchange for our common stock, fluctuations in our stock price could have a material adverse effect on our
ability to complete acquisitions and the issuance of common stock to acquire other businesses could be dilutive to our stockholders. To the extent that we use borrowings to acquire other businesses,
our debt service obligations could increase substantially and relevant debt instruments may, among other things, impose additional restrictions on our operations, require us to comply with additional
financial covenants or require us to pledge additional assets to secure our borrowings.

We may have difficulty integrating the operations of any companies we acquire, which may adversely affect our results of operations.

The success of our acquisition strategy will depend upon our ability to successfully integrate any businesses we may acquire in the future. The integration of
these businesses into our operations may result in unforeseen events or operating difficulties, absorb significant management attention and require significant financial resources that would otherwise
be available for the ongoing development of our business. These integration difficulties could include the integration of personnel with disparate business backgrounds, the transition to new
information systems, coordination of geographically dispersed organizations, loss of key employees of acquired companies and reconciliation of different corporate cultures. For these or other reasons,
we may be unable to retain key clients or to retain or renew contracts of acquired companies. Moreover, any acquired business may fail to generate the

27

---



revenue
or net income we expected or produce the efficiencies or cost-savings that we anticipated. Any of these outcomes could materially adversely affect our operating results.

If we are unable to manage our growth, our business may be adversely affected.

Sustaining our growth has placed significant demands on our management, as well as on our administrative, operational and financial resources. If we continue to
grow, we must improve our operational, financial and management information systems and expand, motivate and manage our workforce. If we are unable to do so, or if new systems that we implement to
assist in managing any
future growth do not produce the expected benefits, our business, prospects, financial condition or operating results could be materially adversely affected.

Systems failures may disrupt our business and have an adverse effect on our results of operations.

Any systems failures, including failure of network, software or hardware systems, whether caused by us, a third-party service provider, unauthorized intruders and
hackers, computer viruses, natural disasters, power shortages or terrorist attacks, could cause loss of data and interruptions or delays in our business or that of our clients. In addition, the
failure or disruption of mail, communications or utilities could cause us to interrupt or suspend our operations or otherwise harm our business. Our property and business interruption insurance may be
inadequate to compensate us for losses that may occur as a result of any system or operational failure or disruption, and insurance to cover these types of risks may not be available in the future on
terms that we consider acceptable, if at all.

The
systems and networks that we maintain for our clients, although redundant in their design, could also fail. If a system or network we maintain were to fail or experience service
interruptions, we might experience loss of revenue or face claims for damages or contract termination. Our liability insurance may be inadequate to compensate us for damages that we might incur and
liability insurance to cover these types of risks may not be available in the future on terms that we consider acceptable, or at all.

Security breaches in government systems that we develop, integrate, maintain or manage could adversely affect our business and reputation, as well as expose us to other risks
and losses.

Many of the systems we develop, integrate, maintain or manage involve protecting information relating to national security and other sensitive government
functions. A security breach in one of these systems could result in damage to our customers, as well as expose us to unknown risks or losses that could exceed the policy limits of our insurance.
Additionally, such a security breach could substantially harm our reputation, including rendering us ineligible for work on sensitive or classified projects.

If our subcontractors fail to perform their contractual obligations, our performance as a prime contractor and our ability to obtain future business could be materially and
adversely impacted.

Approximately 20% of our total revenue for fiscal 2007 and 19% of our total revenue for fiscal 2006 was generated by work performed by subcontractors who perform
a portion of the work we are obligated to deliver to our clients. A failure by one or more of our subcontractors to satisfactorily deliver on a timely basis the agreed-upon supplies and/or
perform the agreed-upon services may materially and adversely affect our ability to perform our
obligations as a prime contractor. In extreme cases, a subcontractor's performance deficiency could result in the Federal Government terminating our contract for default. A default termination could
expose us to liability for excess costs of reprocurement by the government and have a material adverse effect on our ability to compete for future contracts and task orders.

28

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Our indebtedness and debt service obligations may increase substantially and we will be subject to restriction under debt instruments.

As of December 29, 2007, we had approximately $94.3 million of term debt and $20.0 million of revolving credit debt outstanding under our
credit facility. In addition, as of December 29, 2007, we had $40.0 million available for borrowing under the revolving credit facility. On February 13, 2008, we amended and
restated the credit facility, increasing the amount available under the revolving line of credit to $140.0 million and reducing our outstanding term debt from approximately $94.3 million
to $60.0 million. After the closing of the amended and restated credit facility, we had outstanding term debt of $60.0 million and approximately $56.7 million of revolving credit
debt outstanding.

Our
leverage may increase as a result of any future acquisitions and, accordingly, the amount of our indebtedness will likely increase, perhaps substantially.

Our
indebtedness could have significant negative consequences, including:



Our
credit facility bears interest at variable rates based upon prevailing market interest rates, which exposes us to the risk of increased interest rates. Also, our credit facility
requires that we comply with various financial covenants and impose restrictions on us, including restrictions on, among other things, our ability to incur additional indebtedness or liens, make
acquisitions and pay dividends on our capital stock.

Our
ability to make scheduled payments of the principal of, to pay interest on, or to refinance, our debt will depend primarily on our future performance, which to a certain extent is
subject to the economic, financial, competitive and other factors beyond our control. There can be no assurance that our business will continue to generate sufficient cash flow from operations in the
future to service our debt or meet our other cash needs. If we are unable to generate this cash flow from our business, we may be required to refinance all or a portion of our existing debt, sell
assets or obtain additional financing to meet our debt obligations and other cash needs. We cannot assure you that any such refinancing, sale of assets or additional financing would be possible on
terms that we would find acceptable.

If
we fail to comply with the financial covenants in our credit facility, our lenders may exercise remedies, including requiring immediate repayment of all outstanding amounts. These
financial covenants are calculated according to the definition of terms contained in the documents governing the credit facility, which may differ from calculations using generally accepted accounting
principles, or GAAP. The financial covenants in our credit facility include the following:



29

---





The
borrowings and other amounts due under our credit facility are secured by substantially all of our current and future tangible and intangible assets, including accounts receivable,
inventory and capital stock of our existing or future subsidiaries. Our ability to obtain other debt financing may therefore be adversely affected because the lenders under our credit facility will
have a prior lien on our assets to secure amounts we owe to them. In addition, upon the occurrence of specified events of default under the credit facility, the lenders would be entitled to demand
immediate repayment of all borrowings and other amounts outstanding under the credit facility and to realize upon the collateral pledged under the credit facility to satisfy our obligations to them.

The
credit facility also requires us to comply with certain covenants, including, among others, provisions:



Risks Related to Our Common Stock

Provisions of our charter and bylaws and Delaware law make a takeover of our company more difficult.

Our basic corporate documents and Delaware law contain provisions that might enable our management to resist an attempt to take over our company. For example, our
Board of Directors can issue shares of common stock and preferred stock without stockholder approval, and the board could issue stock to dilute and adversely affect various rights of a potential
acquiror. Other provisions of our charter and bylaws that could deter or prevent a third party from acquiring us include:



30

---





We
are subject to Section 203 of the Delaware General Corporation Law that, subject to exceptions, would prohibit us from engaging in any business combination with any interested
stockholder, as defined in that section, for a period of three years following the date on which that stockholder became an interested stockholder.

The
board could use these and other provisions to discourage, delay or prevent a change in the control of our company or a change in our management. These provisions might also
discourage, delay or prevent an acquisition of our company at a price that you may find attractive. These provisions could also make it more difficult for you and our other stockholders to elect
directors and take other corporate actions and could limit the price that investors might be willing to pay for shares of our common stock.

Future sales of shares of our common stock and the resulting dilution that would occur with such sales could cause the market price of our common stock to decline.

Sales of a substantial number of shares of common stock in the public market in the course of any offering made pursuant to a registration statement, including
any subsequent registration statement, or the perception that such sales could occur, could materially adversely affect the market price of our common stock and make it more difficult for us to sell
equity securities in the future at a time and price we deem appropriate. As of February 29, 2008, we had 13,202,414 shares of common stock outstanding.

SI International's stock price may fluctuate significantly due to one or any combination of factors including volatility in the stock market or in our operating performance or
prospects.

The stock market in general and the market for technology stocks, in particular, has been volatile. Additionally, our revenue and operating results may vary from
quarter to quarter and may fall below the expectations of securities analysts and investors. SI International's stock price may decrease significantly due to one or any combination of factors,
including those listed in our "Risk Factors" section and others such as:



Item 1B.    Unresolved Staff Comments:

None.

Item 2.    Properties:

As of December 29, 2007, we leased 28 offices and one warehouse at various U.S. locations for an aggregate of approximately 500,000 square feet in 15
states and the District of Columbia, none of which we sublease to third parties.

31

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Our
corporate offices are located at 12012 Sunset Hills Road, Reston, Virginia in approximately 68,000 square feet of leased space.

Our
other major offices are located in Colorado Springs, Colorado, Harrisonburg, Virginia, and in the Washington DC metropolitan area.



All
of our offices are in new, or modern, well-maintained buildings. The facilities are substantially utilized and are adequate for present operations. We do not own any real
estate.

Item 3.    Legal Proceedings:

We are a party to litigation and legal proceedings that we believe to be a part of the ordinary course of our business. While we cannot predict the ultimate
outcome of these matters, we currently believe that any ultimate liability arising out of these proceedings will not have a material adverse effect on our financial position. We may become involved in
other legal and governmental, administrative or contractual proceedings in the future.

The
SEI acquisition agreement provides for a purchase price adjustment based upon the working capital of SEI as of the closing date. Subsequent to the closing date, we received a payment
of $1.6 million in connection with services performed prior to the closing date that SEI had not previously billed, and was not authorized to bill, its customer as of the closing date. The SEI
selling stockholders have asserted that they are entitled to a credit in connection with the calculation of working capital adjustment in an amount equal to the amount received by us for this
post-closing payment. We believe that, in accordance with GAAP, the SEI selling stockholders should not receive the benefit of the post-closing payment. In accordance with the
terms of the SEI acquisition agreement, the parties have jointly submitted the issue to an independent accounting firm for resolution. We anticipate that this matter will be resolved before the end of
2008.

Item 4.    Submission of Matters to a Vote of Security Holders:

The Company had no matters submitted to stockholders for their consideration during the fourth quarter ended December 29, 2007.

32

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PART II

Item 5.    Market for the Company's Common Equity and Related Stockholder Matters and Issuer Purchases of Equity Securities:

Since November 12, 2002, SI International's common stock has been publicly traded on the NASDAQ Stock Market under the symbol "SINT." Prior to
November 12, 2002, SI International's common stock was not publicly traded. The high and low sales prices of SI International's common stock for the time period indicated below, as reported by
the NASDAQ Stock Market, were:

High

LowYear ended December 29, 2007:First Quarter

$
33.50

$
25.01Second Quarter

$
33.76

$
26.36Third Quarter

$
34.87

$
26.35Fourth Quarter

$
31.05

$
24.55Year ended December 30, 2006:First Quarter

$
35.50

$
27.39Second Quarter

$
36.26

$
28.17Third Quarter

$
32.15

$
26.41Fourth Quarter

$
35.00

$
30.34


As
of February 29, 2008, there were approximately 163 holders of record of our common stock. As of February 29, 2008, the closing price of our common stock was $24.88.

We
have never declared or paid any cash dividends on our common stock. We currently intend to retain earnings, if any, to support our growth strategy and do not anticipate paying cash
dividends in the foreseeable future.

33

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Comparative Stock Price Performance Graph

The comparisons on the following graph and table are required by the Securities and Exchange Commission and are not intended to forecast
or be indicative of possible future performance of our common stock. The information contained in this table shall not be deemed to be "soliciting material" or to be "filed" with the Securities and
Exchange Commission, nor shall it be incorporated by reference into any previous or future filings under the Securities Act of 1933 or the Exchange Act.

The
following graph compares the cumulative total stockholder return on our common stock from November 12, 2002 (the first trading in common stock of SI International) through
December 28, 2007, with the cumulative total return on (i) the NASDAQ Stock MarketU.S. index and (ii) a
peer group composed of SI International and the following other Federal Government Service Providers with whom we compete: CACI International Inc., Dynamics Research Corp., ManTech
International Corp., MTC Technologies Inc., NCI, Inc., SRA International Inc., ICF International, Inc. and Stanley, Inc.

The
graph assumes an investment of $100 on November 12, 2002 in each of SI International, the NASDAQ Stock MarketU.S. index and the members of our peer group. The
comparison also assumes that all dividends are reinvested and all returns are market-cap weighted. The historical information set forth below is not necessarily indicative of future
performance.

Comparison of Cumulative Total Return Among SI International, Inc.,  The NASDAQ Stock MarketU.S. Index and Federal Government Services  Provider Index

GRAPHIC

December 29, 2007SI International

$
194.00NASDAQ Stock Market U.S. Index


198.17Federal Government Services Provider Index


167.29


34

---



Item 6.    Selected Financial Data:

The selected financial data presented below for our 2007, 2006, 2005, 2004, and 2003 fiscal years are derived from our audited consolidated financial statements
included in this Form 10-K. You should read the selected financial data presented below in conjunction with the consolidated financial statements, the notes to the consolidated
financial statements and with "Management's Discussion and Analysis of Financial Condition and Results of Operations" included elsewhere in this Form 10-K. Our fiscal year is based
on the calendar year and ends each year on the Saturday closest to, but not falling after, December 31 of that year.All fiscal years shown below other than 2005,
include 52 weeks. Fiscal 2005 includes 53 weeks.

|                                                    |                                     | Fiscal Year
SI International, Inc. |        
|--------------------------------------------------- | ----------------------------------- | ---------------------------------- | -------
|
|
|Statement of Operations Data:                       |                                     |                                    |        
|Revenue                                             |                                     | $                                  | 510,820
|Costs and expenses:                                 |                                     |                                    |        
|                                                    | Cost of services                    |                                    |        
|                                                    | Selling, general and administrative |                                    |        
|                                                    | Depreciation and amortization       |                                    |        
|                                                    | Amortization of intangible assets   |                                    |        
|                                                    |                                     |                                    |        
|Total operating expenses                            |                                     |                                    | 472,186
|                                                    |                                     |                                    |        
|Income from operations                              |                                     |                                    | 38,634 
|Other income (expense)                              |                                     |                                    | 258    
|Interest expense, net                               |                                     |                                    | (7,154 
|                                                    |                                     |                                    |        
|Income before provision for income taxes            |                                     |                                    | 31,738 
|Provision for income taxes                          |                                     |                                    | 12,445 
|                                                    |                                     |                                    |        
|Net income                                          |                                     |                                    | 19,293 
|                                                    |                                     |                                    |        
|Net income attributable to common stockholders      |                                     | $                                  | 19,293 
|                                                    |                                     |                                    |        
|Earnings per common share:                          |                                     |                                    |        
|                                                    | Basic                               |                                    | $      
|                                                    | Diluted                             |                                    |        
|Balance Sheet Data (at period end):                 |                                     |                                    |        
|Cash and cash equivalents                           |                                     | $                                  | 13,129 
|Working capital                                     |                                     |                                    | 60,562 
|Total assets                                        |                                     |                                    | 461,447
|Total debt, including capital lease obligations     |                                     |                                    | 114,525
|Total stockholders' equity                          |                                     |                                    | 260,703
|Other Financial Data:                               |                                     |                                    |        
|Capital expenditures                                |                                     |                                    | 6,029  
|Net cash provided by (used in) operations           |                                     |                                    | 19,233 
|Net cash used in investing activities               |                                     |                                    | (71,701
|Net cash provided by (used in) financing activities |                                     |                                    | 46,140 

35

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Item 7.    Management's Discussion and Analysis of Financial Condition and Results of Operations:

The following discussion and analysis should be read in conjunction with the Item 6. "Selected Consolidated Financial Data," the consolidated financial
statements and related notes included elsewhere in this Form 10-K, and the forward-looking disclaimer language in italics before Item 1. "Business".

Our fiscal year is based on a calendar year and ends each year on the Saturday closest to, but not falling after, December 31 of that year. As a result,
our fiscal year may be comprised of 52 or 53 weeks.Our 2005 fiscal year had 53 weeks. Our 2007, 2006, 2004 and 2003 fiscal years each had
52 weeks.

Overview

We are, first and foremost, a provider of information technology, or IT, and network solutions to the Federal Government. Our clients include the U.S. Air Force,
U.S. Army, U.S. Navy, Department of State, Department of Homeland Security, Department of Energy, Department of Agriculture, National Institutes of Health, Federal Retirement Thrift Investment Board,
National Guard Bureau, and the Intelligence community. We combine our technology and industry expertise to provide a full spectrum of state-of-the-practice
solutions and services, from design and development to implementation and operations, which assist our clients in achieving mission success. We believe that our company is distinguishable from our
peers within the federal IT sector in several important respects.

We
employ a "Rapid Response  Rapid Deployment®" methodology that enables the rapid standing up of innovative solutions and the incorporation of
additional capabilities in rapid succession. This capability allows us to respond to urgent IT imperatives quickly, often in a matter of months, and within a well defined budget. We can, therefore,
provide solutions for current IT needs, while establishing a platform for advancing long-term transformational objectives. We possess a proven ability to respond to high priority
information technology and network needs through innovation, and an enviable reputation for timely delivery of robust solutions on assignments
where failure is not an option. Our solutions enable clients to respond to new mandates, expand the scope of their missions, and reengineer underlying business processes. We have a demonstrated
ability of turning troubled IT projects into winning outcomes and realized exceptional growth from high-quality client engagements. We also utilize mature and proven processes to manage
and market large-scale ID/IQ contracts, such as C4I2TSR. We employ a diverse, innovative team that effectively utilizes small business partners' unique skills and expertise for mission critical IT
projects.

Fiscal 2007 Review and Fiscal 2008 Outlook

During the past year, we experienced continued growth in our four key focus areas: Defense Transformation, Homeland Defense, Federal IT Modernization, and
Mission-Critical Outsourcing. Virtually all of our engagements with the DoD either directly support, or are closely related to DoD Transformation goals. We will continue aligning our programs and
capabilities along our focus areas of Homeland Defense, Federal IT Modernization, Mission-Critical Outsourcing, and Defense Transformation given these sectors most accurately reflect our customer's
highest priorities. The Federal Government's increased use of technology drove our growth in 2007. We expect that government initiatives involving information sharing, "net-centric"
warfare, and business process transformation will be among our customer base's key focus areas in 2008.

In
June 2007, we acquired LOGTEC, which enhanced our ability to provide a full spectrum logistics support, acquisition support, program management and related information technology
services across the complete systems life-cycle with core competencies in systems support, data management, network design and maintenance, systems integration, financial management,
engineering test & evaluation, or T&E, acquisition management supply and maintenance support. We service programs for the Army, Navy and Department of Defense such as the Defense Logistics
Agency, Defense Finance

36

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and
Accounting Service, Naval Air Depots and Headquarters, Army Materiel Command. Our logistics teams are playing a key role in implementing the Base Re-alignment & Closure
Commission's recommendations; assisting elements of each service as they re-locate and sustain operations.

For
each of fiscal 2007 and fiscal 2006, we received approximately 99% of our revenues from services we provided to various departments and agencies of the Federal Government, both
directly and through other prime contractors, and approximately 1% of our total revenues from work performed for commercial entities. The following table shows our revenues from the client groups
listed as a percentage of total revenue. Revenue data for the DoD includes revenues generated from work performed under engagements for both the DoD and the Intelligence community.

Fiscal Year2007

2006

2005Department of Defense

45.5
%
46.6
%
46.9
%Federal civilian agencies

53.3
%
51.9
%
51.2
%Commercial entities

1.2
%
1.5
%
1.9
%Total revenue

100.0
%
100.0
%
100.0
%


We
have derived a substantial majority of our revenues from governmental contracts under which we act as a prime contractor. We also provide services indirectly as a subcontractor. The
following table shows our revenues as prime contractor and as subcontractor as a percentage of our total revenue for the following periods:

Fiscal Year2007

2006

2005Prime contract revenue

78.8
%
79.6
%
75.4
%Subcontract revenue

21.2
%
20.4
%
24.6
%Total revenue

100.0
%
100.0
%
100.0
%


Our
services are provided pursuant to three types of contracts: cost reimbursable, time and materials and fixed price contracts. The following table shows our revenues from each of these
types of contracts as a percentage of our total revenue for the following periods:

Fiscal Year2007

2006

2005Cost reimbursable

27.6
%
31.8
%
30.0
%Time and materials

34.7
%
40.2
%
43.8
%Fixed price

37.7
%
28.0
%
26.2
%Total

100.0
%
100.0
%
100.0
%


Our
fixed price revenues, as a percentage of total revenues, increased to approximately 37.7% in fiscal 2007. This increase was primarily due to our contract with the U.S. Patent and
Trademark Office which began in 2007 along with additional fixed price task orders or programs with the Air Force, the Office of Personnel Management, Department of Homeland Security and the
Department of State.

Under
cost reimbursable contracts, we are reimbursed for costs that are determined to be reasonable, allowable and allocable to the contract, and pay a fee representing the profit margin
negotiated between us and the contracting agency, which may be fixed or performance based. Under cost reimbursable contracts we recognize revenues and an estimate of applicable fees earned as costs
are incurred. We consider fixed fees under cost reimbursable contracts to be earned in proportion to the allowable costs incurred in performance of the contract. For performance-based fees under cost

37

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reimbursable
contracts, we recognize the relevant portion of the expected fee to be awarded by the client at the time such fee can be reasonably estimated, based on factors such as our prior award
experience and communications with the client regarding performance. In general, cost reimbursable contracts are the least profitable of our government contracts.

Under
time and materials contracts, we are reimbursed for labor at fixed hourly rates and generally reimbursed separately for allowable materials, costs and expenses. To the extent that
our actual labor costs under a time and materials contract are higher or lower than the billing rates under the contract, our profit under the contract may either be greater or less than we
anticipated or we may suffer a loss under the contract. We recognize revenues under time and materials contracts by multiplying the number of direct labor hours expended by the contract billing rates
and adding the effect of other billable direct costs. In general, we realize a higher profit margin on work performed under time and materials contracts than cost reimbursable contracts. As discussed
above, in our Risk Factors, changes to the acquisition regulations applicable to time and material and labor hour service contracts may result in the awarding of fewer such contracts, or a reduction
in the term of such contracts.

Under
fixed price contracts, we perform specific tasks for a fixed price. Compared to cost reimbursable and time and materials contracts, fixed price contracts generally offer higher
profit margin opportunities but involve greater financial risk because we bear the impact of cost overruns in return for the full benefit of any cost savings. We generally do not undertake complex,
high-risk work, such as long-term software development, under fixed price terms. Fixed price contracts may include either a product delivery or specific service performance
over a defined period. Revenue on fixed price contracts that provide for the Company to render services throughout a period is recognized as earned according to contract terms as the service is
provided on a proportionate performance basis. While a substantial number of these contracts are generally less than six months in duration, we have several multi-year contracts of this
type in which the customer has the option to extend the contractual term beyond the current term.

If
we anticipate a loss on a contract accounted for under SOP 81-1,Accounting for Performance of Construction-Type and Certain
Production-Type Contracts(SOP 81-1), we provide for the full amount of anticipated loss at the time of that determination. Projected losses on
all other contracts are recognized as the services and materials are provided.

Our
most significant expense is cost of services, which consists primarily of direct labor costs for program personnel and direct expenses incurred to complete contracts, including cost
of materials and subcontract efforts. Our ability to predict accurately the number and types of personnel, their salaries, and other costs, can have a significant impact on our direct cost.

The
allowability of certain direct and indirect costs in federal contracts is subject to audit by the client, usually through the DCAA. Certain indirect costs are charged to contracts
and paid by the client using provisional, or estimated, indirect rates, which are subject to later revision, based on the government audits of those costs.

We
actively monitor our relationships with our clients during our engagements, as well as the quality of the service we provide, to assist in our efforts to win recompetition bids. In
addition, we strive to maintain good relationships with a wide variety of government contractors.

38

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Results of Operations

The following table sets forth certain items from our consolidated statements of operations as a percentage of revenues for the periods indicated.

Fiscal Year2007

2006

2005Revenue

100.0
%
100.0
%
100.0
%Costs and expenses:Cost of services

63.7

62.9

61.9Selling, general and administrative

27.2

27.0

28.5Depreciation and amortization

0.7

0.6

0.5Amortization of intangible assets

0.8

0.7

0.6Total operating expenses

92.4

91.2

91.5Income from operations

7.6

8.8

8.5Interest expense, net

(1.4
)
(1.6
)
(1.5
)Income before provision for income taxes

6.2

7.2

7.0Provision for income taxes

2.4

2.8

2.7Net income

3.8
%
4.4
%
4.3
%


Fiscal year 2007 compared with fiscal year 2006

Revenue.Substantially all of our revenue is derived from services and solutions provided to the Federal Government,
primarily by our employees and, to a lesser extent, our subcontractors. Revenues from work under Federal Government contracts increased 10.9% to $504.8 million from $455.3 million for
the
same period in 2006. This increase was attributable to the projects added from the LOGTEC acquisition in June 2007, organic growth in our civilian agency business from new contract awards, successful
recompetition wins on existing programs, and new contracts from and growth within existing programs. Commercial and other revenues decreased 10.4% to $6.0 million in 2007 from
$6.7 million in 2006. This decrease was attributable to our continued focus on opportunities for the Federal Government. We expect revenue growth to continue primarily from Federal Government
civilian and defense organizations.

Cost of services.Cost of services includes direct labor and other direct costs, such as materials and subcontracts, incurred
to provide our services and solutions to our customers. Generally, changes in cost of services are correlated to changes in revenue as resources are consumed in the production of that revenue. The
increase in cost of services from fiscal 2006 to fiscal 2007 was attributable primarily to the increase in revenue along with startup costs incurred with a new contract. As a percentage of revenue,
cost of services were 63.7% for fiscal 2007 as compared to 62.9% for fiscal 2006. Cost of services will continue to increase in conjunction with revenue growth.

Selling, general and administrative expenses.Selling, general and administrative expenses include facilities, selling, bid
and proposal, indirect labor, fringe benefits and other discretionary costs. The increase in selling, general and administrative expenses from fiscal 2006 to fiscal 2007 was primarily attributable to
the expected growth of support functions necessary to facilitate and administer the growth in cost of services as well as the integration of LOGTEC. In fiscal 2007, selling, general and administrative
expenses were 27.2% of revenue compared to 27.0% of revenue in fiscal 2006. We believe in future years, indirect costs will continue to grow, but should decrease as a percentage of revenue.

39

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Depreciation and Amortization.Depreciation and amortization includes the depreciation of computers, furniture and other
equipment, the amortization of third party software we use internally, and leasehold improvements. As a percentage of revenue, depreciation was 0.7% for fiscal 2007 as compared to 0.6% for the same
period in fiscal 2006.

Amortization of Intangible Assets.Amortization of intangible assets includes the amortization of intangible assets acquired
in connection with our acquisitions in accordance with SFAS 142,Goodwill and Other Intangible Assets. Identifiable intangible assets are
amortized over their estimated useful lives. Non-compete agreements are generally amortized straight-line over the term of the agreement, while contracts and related client
relationships are amortized using an accelerated method over their estimated useful lives. For the year ended December 29, 2007, amortization of intangible assets was $4.0 million,
compared to $3.1 million for the year ended December 30, 2006. This increase was attributable primarily to the LOGTEC acquisition. As a percentage of revenue amortization of intangible
assets was 0.8% for the year ended December 29, 2007 compared to 0.7% for the year ended December 30, 2006.

Income from operations.The decrease in income from operations from fiscal 2006 to fiscal 2007 was attributable primarily to
the increase in operating costs as described above. As a percentage of revenue, income from operations was 7.6% for fiscal 2007 as compared to 8.8% in fiscal 2006. We expect short-term
fluctuations in our operating margins from time to time, such as when we incur substantial start-up costs associated with new customer contracts.

Interest expense, net.Interest expense is primarily related to outstanding borrowings under our credit facility, the
amortization of loan origination fees, and, to a lesser extent, our interest rate swap agreements. The decrease in interest expense from fiscal 2006 to fiscal 2007 was attributable primarily to a
$1.1 million write off of loan origination fees in 2006 due to the prepayments on the term loan partially offset by increased borrowings under our Amended Credit Agreement in connection with
the LOGTEC acquisition in June 2007. As a percentage of revenue, interest expense was 1.4% for fiscal 2007 as compared to 1.6% for the same period in fiscal 2006. Interest expense included
$0.6 million and $1.8 million of amortization and write-off of deferred financing costs during fiscal years 2007 and 2006, respectively.

Provision for income taxes.Our effective tax rate is typically greater than the federal statutory rate of 35% due primarily
to state income tax rates and certain nondeductible expenses. Our fiscal year 2007 tax provision represents an effective tax rate of 39.2%. Our fiscal 2006 tax provision represents an effective tax
rate of 38.9%.

Fiscal year 2006 compared with fiscal year 2005

Revenue.Substantially all of our revenue is derived from services and solutions provided to the Federal Government,
primarily by our employees and, to a lesser extent, our subcontractors. Revenues from work under Federal Government contracts increased 16.7% to $455.3 million from $390.3 million for
the same period in 2005. This increase was attributable to the acquisition and integration of Zen in the first quarter of 2006, new contract awards, successful recompetition wins on existing programs
and growth within existing programs in our three focus areas: Federal IT Modernization/Mission-Critical Outsourcing, Defense Transformation, and Homeland Defense. Commercial and other revenues
decreased 11.8% to $6.7 million in 2006 from $7.6 million in 2005. This decrease was attributable to our continued focus on opportunities for the Federal Government. We expect revenue
growth to continue primarily from Federal Government civilian and defense organizations.

Cost of services.Cost of services includes direct labor and other direct costs, such as materials and subcontracts, incurred
to provide our services and solutions to our customers. Generally, changes in cost of services are correlated to changes in revenue as resources are consumed in the production of

40

---



that
revenue. Please note that in our reported financial statements prior to the second quarter ended July 1, 2006, we referred to cost of services as "direct costs". The increase in cost of
services from fiscal 2005 to fiscal 2006 was attributable primarily to the increase in revenue. As a percentage of revenue, cost of services were 62.9% for fiscal 2006 as compared to 61.9% for fiscal
2005. Cost of services will continue to increase in conjunction to revenue growth.

Selling, general and administrative expenses.Selling, general and administrative expenses include facilities, selling, bid
and proposal, indirect labor, fringe benefits and other discretionary costs. Please note that in our reported financial statements prior to the second quarter ended July 1, 2006, we referred to
selling, general and administrative expenses as "indirect costs". The increase in selling, general and administrative expenses from fiscal 2005 to fiscal 2006 was primarily attributable to the
expected growth of support functions necessary to facilitate and administer the growth in cost of services as well as the integration of Zen. In fiscal 2006, selling, general and administrative
expenses were 27.0% of revenue compared to 28.5% of revenue in fiscal 2005. We believe in future years, indirect costs will continue to grow, but should decrease as a percentage of revenue.

Depreciation and Amortization.Depreciation and amortization includes the depreciation of computers, furniture and other
equipment, the amortization of third party software we use internally, and leasehold improvements. As a percentage of revenue, depreciation was 0.6% for fiscal 2006 as compared to 0.5% for the same
period in fiscal 2005.

Amortization of Intangible Assets.Amortization of intangible assets includes the amortization of intangible assets acquired
in connection with our acquisitions in accordance with SFAS 142, Goodwill and Other Intangible Assets. Identifiable intangible assets are amortized over their estimated useful lives.
Non-compete agreements are generally amortized straight-line over the term of the agreement, while contracts and related client relationships are amortized using an accelerated
method over their estimated useful lives. For the fiscal year ended December 30, 2006, we amortized $3.1 million of intangible assets which we capitalized in connection with the
acquisitions of Zen, SEI, Bridge and Matcom. For the fiscal year ended December 31, 2005, we amortized $2.3 million of intangible assets which we capitalized in connection with the
acquisitions of SEI, Bridge, and Matcom.

Income from operations.This increase in income from operations from fiscal 2005 to fiscal 2006 was attributable primarily to
the increase in revenue. As a percentage of revenue, income from operations was 8.8% for fiscal 2006 as compared to 8.5% in fiscal 2005. We anticipate that this trend of improving operating margins
will continue, but we also expect short-term fluctuations in our operating margins from time to time, such as when we incur substantial start-up costs associated with new
customer contracts.

Interest expense, net.Interest expense is primarily related to interest expense incurred under our outstanding borrowings
under our credit facility and, going forward, to a lesser extent, our interest rate swap agreement. The increase in interest expense from fiscal 2005 to fiscal 2006 was attributable primarily to the
increased borrowings under our Amended Credit Agreement in connection with the Zen acquisition and the $1.1 million write off of loan origination fees due to the prepayments on the term loan.
As a percentage of revenue, interest expense was 1.7% for fiscal 2006 as compared to 1.5% for the same period in fiscal 2005. Interest expense included $1,821,000 and $705,000 of amortization and
write-off of deferred financing costs during fiscal years 2006 and 2005, respectively.

Provision for income taxes.Our effective tax rate is typically greater than the federal statutory rate of 34% due primarily
to state income tax rates and certain nondeductible expenses. Our fiscal year 2006 tax provision represents an effective tax rate of 38.9%. Our fiscal 2005 tax provision represents an effective tax
rate of 39.3%.

41

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The
following table sets forth certain items from our consolidated statements of operations.

|                                    |  | Fiscal Year |         | Percentage Change |  
|----------------------------------- |  | ----------- | ------- | ----------------- | -
|
|Revenue                             |  | $           | 510,820 |                   | $
|Cost of services                    |  |             | 325,695 |                   |  
|Selling, general and administrative |  |             | 138,854 |                   |  
|Depreciation and Amortization       |  |             | 3,590   |                   |  
|Amortization of Intangible Assets   |  |             | 4,047   |                   |  
|                                    |  |             |         |                   |  
|Income from Operations              |  |             | 38,634  |                   |  
|Other Income                        |  |             | 258     |                   |  
|Interest Expense, net               |  |             | (7,154  | )                 |  
|Provision for Income Taxes          |  |             | 12,445  |                   |  
|                                    |  |             |         |                   |  
|Net Income                          |  | $           | 19,293  |                   | $
|                                    |  |             |         |                   |  

Supplemental Quarterly Information

The following table sets forth quarterly unaudited consolidated financial data for the fiscal quarters of 2007 and 2006, expressed in dollars and as a percentage
of total revenues for the respective periods. We believe that this unaudited financial information includes all adjustments, consisting only of normal recurring adjustments, necessary for a fair
presentation of the information for each period. All of the fiscal quarters reflected in the following table had thirteen weeks. Some unevenness of revenue from quarter to quarter exists primarily
because of the timing of purchases of materials necessary to perform certain obligations under our C4I2SR contract with U.S. Air Force Space Command.

|                           |                                   | Fiscal Year 2007(1) |         | Fiscal Year 2006 |  
|-------------------------- | --------------------------------- | ------------------- | ------- | ---------------- | -
|
|
|Revenue                    |                                   | $                   | 113,700 |                  | $
|Costs and expenses:        |                                   |                     |         |                  |  
|                           | Cost of services                  |                     |         | 70,892           |  
|                           | Selling, general & administrative |                     |         | 32,139           |  
|                           | Depreciation and amortization     |                     |         | 794              |  
|                           | Amortization of intangible assets |                     |         | 748              |  
|                           |                                   |                     |         |                  |  
|Total operating expenses   |                                   |                     | 104,573 |                  |  
|                           |                                   |                     |         |                  |  
|Income from operations     |                                   |                     | 9,127   |                  |  
|Other income (expense)     |                                   |                     | 71      |                  |  
|Interest expense, net      |                                   |                     | (1,397  | )                |  
|Provision for income taxes |                                   |                     | 3,067   |                  |  
|                           |                                   |                     |         |                  |  
|Net income                 |                                   | $                   | 4,734   |                  | $
|                           |                                   |                     |         |                  |  
|Revenue                    |                                   |                     | 100.0   | %                |  
|                           |                                   |                     |         |                  |  
|Costs and expenses:        |                                   |                     |         |                  |  
|                           | Cost of services                  |                     |         | 62.3             |  
|                           | Selling, general & administrative |                     |         | 28.3             |  
|                           | Depreciation and amortization     |                     |         | 0.7              |  
|                           | Amortization of intangible assets |                     |         | 0.7              |  
|                           |                                   |                     |         |                  |  
|Total operating expenses   |                                   |                     | 92.0    |                  |  
|                           |                                   |                     |         |                  |  
|Income from operations     |                                   |                     | 8.0     |                  |  
|Other income (expense)     |                                   |                     | 0.1     |                  |  
|Interest expense, net      |                                   |                     | (1.2    | )                |  
|Provision for income taxes |                                   |                     | 2.7     |                  |  
|                           |                                   |                     |         |                  |  
|Net income                 |                                   |                     | 4.2     | %                |  
|                           |                                   |                     |         |                  |  

---

42

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Liquidity and Capital Resources

General.Short-term liquidity requirements generally consist of financing working capital, investing in capital
expenditures, and the need to fund debt service. We expect to meet these requirements through a combination of cash flow from operations and borrowings under our credit facility.

We
anticipate that our long-term liquidity requirements, including any further acquisitions, will be funded through a combination of cash flow from operations, borrowings
under our credit facility, additional secured or unsecured debt or the issuance of common or preferred stock, each of which may be initially funded through borrowings under our credit facility.

Cash and Cash Equivalents.We consider cash on deposit and all highly liquid investments with original maturities of three
months or less to be cash and cash equivalents. Cash and cash equivalents, including marketable securities, as of the end of fiscal year 2007, fiscal year 2006 and fiscal year 2005 were
$13.1 million, $19.5 million and $34.0 million, respectively.

Cash Flow.The following table sets forth our sources and uses of cash for fiscal years 2007, 2006 and 2005.

Fiscal Year2007

2006

2005(in thousands)Net cash provided by operations

$
19,233

$
32,256

$
25,038Net cash used in investing activities


(71,701
)

(58,981
)

(74,821
)Net cash provided by financing activities


46,140


20,022


72,189Net (decrease) increase in cash

$
(6,328
)
$
(6,703
)
$
22,406


Our
operating cash flow is primarily affected by the overall profitability of our contracts, our ability to invoice and collect from our clients in a timely manner, and our ability to
manage our vendor payments. We bill most of our clients monthly after services are rendered. Cash provided by operations in fiscal year 2007 was attributable to net income of $19.3 million plus
depreciation, amortization and other non-cash items of $14.6 million offset by an increase in working capital of $14.7 million. Cash provided by operations in fiscal year
2006 was mainly attributable to net income of $20.2 million, plus depreciation, amortization and other non-cash items of $11.0 million. Cash used in operations in fiscal year
2005 was attributable to net income of $16.9 million plus depreciation, amortization and other non-cash items of $8.3 million.

Our
cash flow used in investing activities consists primarily of capital expenditures, the purchase and sale of marketable securities, and acquisitions. In fiscal 2007, we paid
$59.7 million to acquire LOGTEC, repaid a note payable to former owners for $6.0 million, and purchased capital assets totaling $6 million. In fiscal 2006, we paid
$48.4 million to acquire Zen, repaid a contract settlement and a note payable to former owners for $10.3 million, purchased $42 million of marketable securities, and purchased
capital assets totaling $8.5 million. We partially offset the cash use with $49.8 million of proceeds from the sale of marketable securities. In fiscal year 2005, we paid
$74.0 million for SEI, purchased $42.1 million of marketable securities, and purchased capital assets totaling $2.7 million. We partially offset the cash use
with $36.2 million of proceeds from the sale of marketable securities and $8.0 million of former owner payable.

Our
cash flow provided by financing activities consists primarily of borrowings under and payments on our credit facility and proceeds from the issuance and exercise of common stock.
Cash provided by financing activities for fiscal year 2007 was attributable to $25.0 million of proceeds from the issuance of term debt, $20.0 million of proceeds from borrowings under
our line of credit, $2.0 million of proceeds from the exercise of stock options and $0.3 million of income tax benefit from stock option

43

---



exercises,
net of $0.9 million repayment of term debt, payment of debt issuance fees of $0.1 million, and repayments of capital leases of $0.1 million. Cash provided by financing
activities for fiscal year 2006 was attributable to proceeds of $40.3 million from the sale of common stock, $30.0 million of proceeds from the issuance of term debt, $7.4 million
of proceeds from the exercise of stock options and $2.1 million of income tax benefit from stock option exercises, net of $59.1 million repayment of term debt, payment of debt issuance
fees of $0.6 million, and repayments of capital leases of $0.1 million. Cash provided by financing activities for fiscal year 2005 was attributable to proceeds of $100.0 million
from the term loan portion of our credit facility, proceeds of $3.7 million from the exercise of stock options and $1.6 million of income tax benefit from stock option exercises. Cash
provided by financing activities was partially offset by repayments of borrowings under the line of credit portion of our credit facility of $29.0 million, payment of debt issuance fees of
$3.2 million, partial repayment of the term loan portion of our credit facility of $0.8 million, and repayments of capital leases of $0.1 million.

Credit facility.Since 2002, we have maintained a credit facility with Wachovia Bank, National Association or Wachovia Bank,
acting as Administration Agent for a syndicate of lenders. The credit facility has been amended from time to time since 2002. The credit facility is secured by a pledge of substantially all of our
current and future tangible and intangible assets, as well as those of our current and future subsidiaries, including accounts receivable, inventory and capital stock.

On
February 9, 2005, we entered into our Amended and Restated Credit Agreement, which was subsequently amended by a First Amendment to the Amended and Restated Credit Agreement
dated February 27, 2006 and a Second Amendment to the Amended and Restated Credit Agreement or the Second Amendment, dated June 8, 2007. The Second Amendment, executed contemporaneously
with our closing of the LOGTEC acquisition, increased the amount of outstanding term debt by $25 million, to a total of approximately $95 million. Additionally, we borrowed approximately
$25 million under the revolving credit facility. As of December 29, 2007, we had approximately $94.3 million of term debt and $20.0 million of revolving credit debt
outstanding under our credit facility.

On
February 13, 2008, we entered into a Second Amended and Restated Credit Agreement or the Second Amended Credit Agreement. The amended and restated credit facility consists of a
revolving line of credit of up to $140.0 million and a term loan of $60.0 million. As of February 13, 2008, we had $60.0 million in term debt and approximately
$56.7 million of revolving credit debt outstanding. The Second Amended Credit Agreement also amended debt covenant thresholds and lowered the variable
rate margins that are be to be applied to London Interbank Offered Rate, or LIBOR, or to an alternative base rate in determining the periodic interest rate.

At
the time the Company borrows funds from either of the loan facilities under the Second Amended Credit Agreement, it may choose from two interest rate options. The Company may elect to
have the borrowings bear interest at floating rates equal to LIBOR plus a spread ranging from 85 to 150 basis points or an alternative base rate plus a spread ranging from zero to 50 basis points.
Under either the LIBOR or alternative base rate option, the exact interest rate spread will be determined based upon the Company's leverage ratio as defined in the Second Amended Credit Agreement.

The
term loan facility requires final payment in full on the term loan maturity date of February 13, 2013. The outstanding balance under the revolving line of credit facility will
accrue interest at a variable rate, with interest only payments being required until the facility matures on February 13, 2013. We may repay either or both of the term loan facility and the
revolving loan facility in whole or in part at anytime prior to their respective maturity dates.

44

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Tabular Disclosure of Contractual Obligations

Our contractual obligations as of December 29, 2007 are as follows (in thousands):

|                |  | Payment due by period |         | 
|--------------- |  | --------------------- | ------- | 
|
|
|Capital Lease   |  | $                     | 291     | 
|Operating Lease |  |                       | 57,964  | 
|Credit Facility |  |                       | 114,265 | 
|                |  |                       |         | 
|Total           |  | $                     | 172,520 | 
|                |  |                       |         | 

Purchase
obligations related to existing contracts are with the Federal Government and, in the event any contracts are terminated, we would have the ability to submit a termination claim
for outstanding purchases.

In
connection with our acquisition of LOGTEC in June 2007, we increased our total long-term debt to approximately $95 million. During the fiscal year ended
December 29, 2007, the Company made regular quarterly payments totaling $0.9 million of outstanding term debt under the credit facility after which the remaining principal balance as of
December 29, 2007, was approximately $94.3 million.

Effects of Inflation

We generally have been able to price our contracts in a manner to accommodate the rates of inflation experienced in recent years. Under our time and materials
contracts, labor rates are usually adjusted annually by predetermined escalation factors. Our cost reimbursable contracts automatically adjust for changes in cost. Under our fixed-price contracts, we
include a predetermined escalation factor, but we have generally have not been adversely affected by inflation.

Off-Balance Sheet Arrangements

During fiscal year 2007, we were not a party to any off-balance sheet arrangements.

Critical Accounting Policies and Estimates

Our significant accounting policies are described in Note 2 to our accompanying consolidated financial statements. We consider the accounting policies
included in this section to be critical to the understanding of our results of operations. Our critical accounting policies include the areas where we have made what we consider to be particularly
difficult, subjective or complex judgments in making estimates, and where these estimates can significantly impact our financial results under different assumptions and conditions. We prepare our
financial statements in conformity with accounting principles generally accepted in the United States. As such, we are required to make certain estimates, judgments and assumptions that we believe are
reasonable based upon the information available. These estimates, judgments and assumptions affect the reported amounts of assets and liabilities at the date of the financial statements and the
reported amounts of revenue and expenses during the periods presented. Actual results could be different from these estimates.

Revenue Recognition

The Company recognizes revenue when a contract has been executed, the contract price is fixed and determinable, delivery of services or products has occurred, and
collectibility of the contract price is considered probable and can be reasonably estimated. Revenue is earned under cost reimbursable, time and materials and fixed price contracts.

45

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Under
cost reimbursable contracts, the Company is reimbursed for allowable costs, and paid a fee, which may be fixed or performance-based. Revenues on cost reimbursable contracts are
recognized as costs are incurred plus an estimate of applicable fees earned. The Company considers fixed fees under cost reimbursable contracts to be earned in proportion of the allowable costs
incurred in performance of the contract. For certain cost reimbursable contracts that include performance based fee incentives, the Company recognizes the relevant portion of the expected fee to be
awarded by the customer at the time such fee can be reasonably estimated, based on factors such as the Company's prior award
experience and communications with the customer regarding performance. Other performance based fees are recognized upon customer approval.

Revenue
on time and materials contracts are recognized based on direct labor hours expended at contract billing rates and adding other billable direct costs. For fixed price contracts
that are based on unit pricing or level of effort, the Company recognizes revenue for the number of units delivered in any given fiscal period. For fixed price contracts in which the Company is paid a
specific amount to provide a particular service for a stated period of time, revenue is recognized ratably over the service period.

For
fixed price contracts that provide for the delivery of a specific product with related customer acceptance provisions, revenues are recognized upon product delivery and customer
acceptance. However, a significant portion of the Company's fixed price-completion contracts involve the design and development of complex, client systems. For those contracts that are within scope of
SOP 81-1,Accounting for Performance of Construction-Type and Certain Production-Type Contracts, revenue is
recognized on the percentage-of-completion method using costs incurred in relation to total estimated costs.

The
Company's contracts with agencies of the government are subject to periodic funding by the respective contracting agency. Funding for a contract may be provided in full at inception
of the contract or ratably throughout the contract as the services are provided. In evaluating the probability of funding for purposes of assessing collectibility of the contract price, the Company
considers its previous experiences with its customers, communications with its customers regarding funding status, and the Company's knowledge of available funding for the contract or program. If
funding is not assessed as probable, revenue recognition is deferred until realization is deemed probable.

Contract
revenue recognition inherently involves estimation, including the contemplated level of effort to accomplish the tasks under the contract, the cost of the effort, and an ongoing
assessment of progress toward completing the contract. From time to time, as part of the normal management processes, facts develop that require revisions to estimated total costs or revenues
expected. The cumulative impact of any revisions to estimates and the full impact of anticipated losses on any type of contract are recognized in the period in which they become known.

The
allowability of certain costs under government contracts is subject to audit by the government. Certain indirect costs are charged to contracts using provisional or estimated
indirect rates, which are subject to later revision based on government audits of those costs. Management is of the opinion that costs subsequently disallowed, if any, would not be significant.

Stock Based Compensation

In December 2004, the Financial Accounting Standards Board or FASB issued Statement of Financial Accounting Standards or SFAS No. 123R, Share Based
Payment.SFAS No. 123R addresses the accounting for share-based payment transactions in which an enterprise receives employee
services in exchange for (a) equity instruments of the enterprise or (b) liabilities that are based on the fair value of the enterprise's equity instruments or that may be settled by the
issuance of such equity instruments. SFAS No. 123R requires an entity to recognize the grant-date fair-value of stock options and other equity-based compensation issued
to employees in the income statement. The revised SFAS No. 123R generally requires that an entity account for those transactions using the fair-value-based

46

---



method,
and eliminates the intrinsic value method of accounting in APB Opinion No. 25,Accounting for Stock Issued to Employees, which was
permitted under SFAS No. 123,Accounting for Stock-Based Compensation, as originally issued. The revised SFAS No. 123R requires entities
to disclose information about the nature of the share-based payment transactions and the effects of those transactions on the financial statements. All public companies must use either the modified
prospective or the modified retrospective transition method.

Effective
January 1, 2006, the Company adopted the provisions of SFAS No. 123R using the modified prospective transition method. Due to the use of the modified prospective
method, prior interim periods and fiscal years do not reflect any restated amounts. As disclosed in the stock incentive plan section of Note 10, the Company accelerated the vesting of all
unvested stock options previously awarded to employees, officers and directors in December 2005. The Company had no unvested stock options on January 1, 2006. The Company issued 132,400 shares
of stock options and 75,200 shares of restricted stock during the fiscal year ended December 29, 2007. The stock compensation expense recognized during the fiscal year ended December 29,
2007 was $1.2 million. As of December 29, 2007, the total remaining unrecognized compensation expense related to unvested options and restricted stock awards was $2.4 million and
$2.0 million, respectively, which will be recognized over the weighted average period of 2.5 years.

Item 7A.    Quantitative and Qualitative Disclosures About Market Risk:

We are exposed to certain financial market risks, the most predominant being fluctuations in interest rates for borrowings under our credit facility. Interest
rate fluctuations are monitored by our management as an integral part of our overall risk management program, which recognizes the unpredictability of financial markets and seeks to reduce the
potentially adverse effect on our results of operations. As part of this strategy, we may use interest rate swap arrangements to manage or hedge
our interest rate risk. We do not use derivative financial instruments for speculative or trading purposes.

As
of December 29, 2007, we had $114.3 million outstanding under our credit facility. A 1% change in interest rates would have resulted in our interest expense fluctuating
by approximately $1.1 million for the twelve months ended December 29, 2007.

Effective
February 14, 2006, we entered into an interest swap agreement which reduced our exposure associated with the market volatility of floating LIBOR interest rates. This
agreement has a notional principal amount of $30.0 million divided into three tranches. As of December 29, 2007, the interest rates of these tranches ranged from 4.05% to 4.74%. This
agreement is a hedge against term debt, which bears interest at LIBOR plus a margin which has a current rate ranging from 6.89% to 8.75%. At stated monthly intervals, the difference between the
interest on the floating LIBOR-based debt and the interest calculated in the swap agreement are settled in cash. The estimated value of the swap at December 29, 2007 was three thousand dollars.
The swap matured on February 14, 2008.

Effective
August 13, 2007, we entered into a second interest swap agreement which further reduces our exposure associated with the market volatility of floating LIBOR interest
rates. This agreement has a notional principal amount of $30.0 million as of December 29, 2007, and had a rate of 5.045%. Effective February 13, 2008, the notional value increased
to $60.0 million. This agreement is a hedge against term debt, which bears interest at LIBOR plus a margin which has a current rate ranging from 6.89% to 8.75%. At stated three-month intervals,
the difference between the interest on the floating LIBOR-based debt and the interest calculated in the swap agreement are settled in cash. The estimated value of the swap at December 29, 2007
was a current liability of $1.8 million. The swap matures on August 13, 2010.

In
addition, historically, our investment positions have been relatively small and short-term in nature. We have typically made investments in a fund with an effective
average maturity of fewer than

47

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40 days
and a portfolio make-up consisting primarily of commercial paper and notes, variable rate instruments, and, to a lesser degree, overnight securities and bank instruments.
Since our initial public offering, the Board of Directors approved an investment policy that requires us to invest in relatively short-term, high quality, and high liquidity obligations.

Item 8.    Financial Statements and Supplementary Data:

The consolidated financial statements of SI International, Inc. are submitted on pages F-1 through F-32 of this report.

Item 9.    Changes in and Disagreements with Accountants on Accounting and Financial Disclosure:

None.

Item 9A.    Controls and Procedures:

Quarterly Assessment.We carried out an assessment as of December 29, 2007 of the effectiveness of the design and
operation of our disclosure controls and procedures and our internal control over financial reporting. This assessment was done under the supervision and with the participation of management,
including our Chief Executive Officer and Chief Financial Officer. Rules adopted by the SEC require that we present the conclusions of our Chief Executive Officer and Chief Financial Officer about the
effectiveness of our disclosure controls and procedures and the conclusions of our management about the effectiveness of our internal control over financial reporting as of the end of the period
covered by this Annual Report on Form 10-K.

CEO and CFO Certifications.Included as Exhibits 31.1 and 31.2 to this Annual Report on Form 10-K
are forms of "Certification" of our Chief Executive Officer and Chief Financial Officer. The forms of Certification are required in accordance with Section 302 of the Sarbanes-Oxley Act of
2002. This section of the Annual Report on Form 10-K that you are currently reading is the information concerning the assessment referred to in the Section 302 certifications
and this information should be read in conjunction with the Section 302 certifications for a more complete understanding of the topics presented.

Disclosure Controls and Procedures and Internal Control over Financial Reporting.Management is responsible for establishing
and maintaining adequate disclosure controls and procedures and internal control over financial reporting. Our disclosure controls and procedures are designed to provide reasonable assurance that
information required to be disclosed in our reports filed or submitted under the Exchange Act, such as this Annual Report on Form 10-K, is recorded, processed, summarized and
reported within the time periods specified in the SEC's rules and forms. Our disclosure controls and procedures are also designed to provide reasonable assurance that such information is accumulated
and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

Internal
control over financial reporting is a process designed by, or under the supervision of our Chief Executive Officer and Chief Financial Officer, and effected by our Board of
Directors, management and other personnel, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in
accordance with GAAP and includes those policies and procedures that:



48

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Limitations on the Effectiveness of Controls.Management, including our Chief Executive Officer and Chief Financial Officer,
do not expect that our disclosure controls and procedures or internal control over financial reporting will prevent all errors and all fraud. A control system, no matter how well conceived and
operated, can provide only reasonable, not absolute, assurance that the objectives of the control system are met. Further, the design of a control system must reflect the fact that there are resource
constraints, and the benefits of controls must be considered relative to their costs. Because of the inherent limitations in all control systems, no assessment of controls can provide absolute
assurance
that all control issues and instances of fraud, if any, within the Company have been detected. These inherent limitations include the realities that judgments in decision-making can be faulty, and
that breakdowns can occur because of simple error or mistake. Additionally, controls can be circumvented by the individual acts of some persons, by collusion of two or more people, or by management's
override of the control. The design of any system of controls also is based in part upon certain assumptions about the likelihood of future events, and there can be no assurance that any design will
succeed in achieving its stated goals under all potential future conditions; over time, controls may become inadequate because of changes in conditions, or the degree of compliance with the policies
or procedures may deteriorate. Because of the inherent limitations in a cost-effective control system, misstatements due to error or fraud may occur and not be detected.

Scope of the Assessments.The assessment by our Chief Executive Officer and Chief Financial Officer of our disclosure
controls and procedures and the assessment by our management of our internal control over financial reporting included a review of procedures and discussions with our Disclosure Control Committee and
others in the Company. In the course of the assessments, management sought to identify data errors, control problems or acts of fraud and to confirm that appropriate corrective actions, including
process improvements, were being undertaken. Management used the framework in Internal ControlIntegrated Framework issued by the Committee of Sponsoring Organizations of the Treadway
Commission or COSO, to assess the effectiveness of our internal control over financial reporting.

Our
internal control over financial reporting is also assessed on an ongoing basis by management and other personnel in our Accounting and Internal Audit departments. We consider the
results of these various assessment activities as we monitor our disclosure controls and procedures and internal control over financial reporting and when deciding to make modifications as necessary.
Management's intent in this regard is that the disclosure controls and procedures and the internal control over financial reporting will be maintained and updated (including improvements and
corrections) as conditions warrant. Among other matters, management sought in its assessment to determine whether there were any "material weaknesses" in the Company's internal control over financial
reporting, or whether management had identified any acts of fraud involving senior management, management, or other personnel who have a significant role in our internal control over financial
reporting. This information was important for management to use in its assessment generally, and also because Section 302 certifications require that our Chief Executive Officer and Chief
Financial Officer disclose that information to the Audit Committee of the Board of Directors and to our independent auditors and to report on related matters in this section of the Annual Report on
Form 10-K. In the Public Company Accounting Oversight Board's Auditing Standard No. 5, a "material weakness" is defined as a deficiency, or a combination of deficiencies, in
internal control over financial reporting, such that there is a reasonable possibility that a material misstatement of the company's annual or interim financial statements will not be prevented or
detected on a timely basis. A "deficiency" in internal control over

49

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financial
reporting exists when the design or operation of a control does not allow management or employees, in the normal course of performing their assigned functions, to prevent or detect
misstatements on a timely basis. A deficiency in design exists when (a) a control necessary to meet the control objective is missing or (b) an existing control is not properly designed
so that, even if the control operates as designed, the control objective would not be met. A deficiency in operation exists when a properly designed control does not operate as designed, or when the
person performing the control does not possess the necessary authority or competence to perform the control effectively. Management also sought to deal with other control matters in the assessment,
and in each case if a problem was identified, management considered what revision, improvement and/or correction was necessary to be made in accordance with our on-going procedures.

Evaluation of Disclosure Controls and Procedures.As of the end of the period covered by this report, we carried out an
evaluation, under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, of the effectiveness of the design and operation of
our disclosure controls and procedures. Based upon the evaluation, our Chief Executive Officer and our Chief Financial Officer have concluded that as of December 29, 2007 the Company's
disclosure controls and procedures were effective at the reasonable assurance level.

Management's Report on Internal Control over Financial Reporting.Our management is responsible for establishing and
maintaining adequate internal control over financial reporting, as such term is defined in Exchange Act Rules 13a-15(f) and 15d-15(f). Under the supervision and with the
participation of our management, including Chief Executive Officer and Chief Financial Officer, we conducted an evaluation of the effectiveness of our internal control over financial reporting as of
December 29, 2007 based upon the framework in Internal ControlIntegrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission or COSO. Based on
that evaluation, our management concluded that our internal control over financial reporting was effective as of December 29, 2007.

Ernst &
Young, LLP, an independent registered public accounting firm, also audited the effectiveness of our internal control over financial reporting, as stated in their
report that is included elsewhere herein.

Management's
assessment of and conclusion on the effectiveness of internal control over financial reporting did not include the internal controls of LOGTEC, which was acquired
June 8, 2007. Since the acquisition of LOGTEC, the Company has focused on extending its compliance program for disclosure controls and procedures and internal control over financial reporting
to include LOGTEC. In addition, the Company has established procedures to substantiate the financial information related to the LOGTEC business included in our consolidated financial statements.
LOGTEC constituted $14.5 million of our total assets as of December 29, 2007, and $34.5 million of our revenues for the year then ended. However, at this time, the Company has
elected not to include an assessment of LOGTEC in management's report on the effectiveness of the Company's internal control over financial reporting in the Company's Form 10-K for
the year ended December 29, 2007. This decision is in accordance with guidance from the Division of Corporation Finance and Office of the Chief Accountant of the Securities and Exchange
Commission providing that a company may elect not to include an acquired subsidiary in its management report on the effectiveness of the company's internal control over financial reporting for a
period of up to one year from the acquisition date. Our independent registered public accounting firm's attestation report regarding the effectiveness of our internal control over financial reporting
also did not include an evaluation of the internal control over financial reporting of LOGTEC.

Changes in Internal Control Over Financial Reporting.There were no changes in our internal control over financial reporting
for the fiscal year ended December 29, 2007 that have materially affected, or are reasonably likely to materially affect, our internal control for financial reporting.

Item 9B.    Other Information:

None.

50

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PART III

Item 10.    Directors, Executive Officers and Corporate Governance:

The information concerning our directors and executive officers required by Item 401 of Regulation S-K is included under the captions
"Election of Directors" and "Executive Officers," respectively, in the definitive proxy statement of SI International, Inc. for its 2008 annual meeting of stockholders to be filed with the SEC
pursuant to Regulation 14A promulgated under the Securities Exchange Act of 1934, as amended, or the 2008 Proxy Statement, and that information is incorporated by reference in this
Form 10-K.

The
information required by Item 405 of Regulation S-K concerning compliance with Section 16(a) of the Exchange Act is included under the caption
"Section 16(a) Beneficial Ownership Reporting Compliance" in our 2008 Proxy Statement, and that information is incorporated by reference in this Form 10-K.

The
information required by Item 406 of Regulation S-K concerning the Company's Code of Ethics is included under the caption "Election of Directors" in our 2008
Proxy Statement, and that information is incorporated by referenced in this Form 10-K.

The
information required by Item 407(c)(3) of Regulation S-K concerning the procedures by which Company stockholders may recommend nominees to the Company's
Board of Directors is included under the caption "Election of Directors" in our 2008 Proxy Statement, and that information is incorporated by referenced in this Form 10-K.

The
information required by Item 407(d)(4) of Regulation S-K concerning the report of the Audit Committee is included under the caption "Report of the Audit
Committee" in our 2008 Proxy Statement, and that information is incorporated by referenced in this Form 10-K.

The
information required by Item 407(d)(5) of Regulation S-K concerning the designation of an audit committee financial expert is included under the caption
"Election of Directors" in our 2008 Proxy Statement, and that information is incorporated by referenced in this Form 10-K.

Item 11.    Executive Compensation:

The information required by Item 402 of Regulation S-K concerning executive compensation is included under the captions "Compensation
Discussion and Analysis" and "Executive Compensation" in our 2008 Proxy Statement, and that information is incorporated by reference in this Form 10-K.

The
information required by Item 407(e)(4) of Regulation S-K concerning compensation committee interlocks is included under the caption "Election of Directors"
in our 2008 Proxy Statement, and that information is incorporated by reference in this Form 10-K.

The
information required by Item 407(e)(5) of Regulation S-K concerning the report of the Compensation Committee is included under the caption "Report of the
Compensation Committee" in our 2008 Proxy Statement, and that information is incorporated by reference in this Form 10-K.

Item 12.    Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters:

The information required by Item 201(d) of Regulation S-K concerning securities authorized for issuance under executive compensation
plans is included under the caption "Equity Compensation Plan Information" in our 2008 Proxy Statement, and that information is incorporated by reference in this Form 10-K.

51

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The
information required by Item 403 of Regulation S-K concerning stock ownership is included under the caption "Beneficial Ownership" in our 2008 Proxy
Statement, and that information is incorporated by reference in this Form 10-K.

Item 13.    Certain Relationships and Related Transactions, and Director Independence:

The information required by Item 404 of Regulation S-K concerning transactions with related persons is included under the caption
"Certain Relationships and Related Transactions" in our 2008 Proxy Statement, and that information is incorporated by reference in this Form 10-K.

The
information required by Item 407(a) of Regulation S-K is included under the caption "Election of Directors" in our 2007 Proxy Statement, and that
information is incorporated by reference in this Form 10-K.

Item 14.    Principal Accountant Fees and Services:

The information required by this Item 14 is included under the captions "Ratification of Appointment of Independent Registered Public Accounting Firm" in
our 2008 Proxy Statement, and that information is incorporated by reference in this Form 10-K.

PART IV

Item 15.    Exhibits and Financial Statement Schedules:







52

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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its
behalf by the undersigned, thereunto duly authorized, on the 12 day of March, 2008.

| |  | SI INTERNATIONAL, INC.
| |  | ----------------------
| |  | By:                   

Pursuant
to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the Registrant and in capacities and on the
dates indicated. Each person whose signature appears below hereby constitutes and appoints each of S. Bradford Antle and Thomas E. Dunn as his or her attorney-in-fact and
agent, with full power of substitution and resubstitution for him or her in any and all capacities, to sign any or all amendments to this report and to file same, with exhibits thereto and other
documents in connection therewith, granting unto such attorney-in-fact and agent full power and authority to do and perform each and every act and thing requisite and necessary
in connection with such matters and hereby ratifying and confirming all that such attorney-in-fact and agent or his or her substitutes may do or cause to be done by virtue
hereof.

|Signatures                                      |  | Title                                                                                                        |  | Date          
|----------------------------------------------- |  | ------------------------------------------------------------------------------------------------------------ |  | --------------
|                                                |  |                                                                                                              |  |               
|/s/S BRADFORD ANTLES. Bradford Antle            |  | President, Chief Executive Officer and Director (Principal Executive Officer)                                |  | March 12, 2008
|/s/THOMAS E. DUNNThomas E. Dunn                 |  | Executive Vice President, Chief Financial Officer and Treasurer (Principal Financial and Accounting Officer) |  | March 12, 2008
|/s/RAY J. OLESONRay J. Oleson                   |  | Executive Chairman of the Board                                                                              |  | March 12, 2008
|/s/MAUREEN A. BAGINSKIMaureen A. Baginski       |  | Director                                                                                                     |  | March 12, 2008
|/s/CHARLES A. BOWSHERCharles A. BowsherM        |  | Director                                                                                                     |  | March 12, 2008
|/s/JAMES E. CRAWFORD, IIIJames E. Crawford, III |  | Director                                                                                                     |  | March 12, 2008

53

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|/s/WALTER J. CULVERWalter J. Culver                            |  | Director |  | March 12, 2008
|-------------------------------------------------------------- |  | -------- |  | --------------
|/s/GENERAL R. THOMAS MARSHGeneral R. Thomas Marsh (USAF-Ret.)  |  | Director |  | March 12, 2008
|/s/GENERAL DENNIS J. REIMERGeneral Dennis J. Reimer (USA-Ret.) |  | Director |  | March 12, 2008
|/s/EDWARD H. SPROATEdward H. Sproat                            |  | Director |  | March 12, 2008
|/s/JOHN P. STENBITJohn P. Stenbit                              |  | Director |  | March 12, 2008

54

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INDEX TO EXHIBITS

|Exhibit No. |     | Description                                                                                                                                                                                                                                                                                                                                              
|----------- | --- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|            | 2.1 |                                                                                                                                                                                                                                                                                                                                                          
|            | 3.1 |                                                                                                                                                                                                                                                                                                                                                          
|            | 3.2 |                                                                                                                                                                                                                                                                                                                                                          
|            | 4.1 |                                                                                                                                                                                                                                                                                                                                                          
|            | 4.2 |                                                                                                                                                                                                                                                                                                                                                          
|            | 4.3 |                                                                                                                                                                                                                                                                                                                                                          
|            | 4.4 |                                                                                                                                                                                                                                                                                                                                                          
|10.1        |     | 2002 Amended and Restated Omnibus Stock Incentive Plan (filed as Annex B to the Company's Proxy Statement on Schedule 14A for the 2005 Annual Meeting of Stockholders filed on April 21, 2005 and incorporated
herein by reference).                                                                                                                     
|10.2        |     | January 2001 Nonqualified Stock Option Plan (filed as Exhibit 10.2 to the Company's Registration Statement on Form S-1/A (File No. 333-87964) filed on June 24, 2002 (the "First Amendment") and
incorporated herein by reference).                                                                                                                      
|10.3        |     | SI International, Inc. 2001 Service Award Stock Option Plan (filed as Exhibit 10.3 to the First Amendment and incorporated herein by reference).                                                                                                                                                                                                         
|10.4        |     | 1998 Stock Option Plan (filed as Exhibit 10.5 to the First Amendment and incorporated herein by reference).                                                                                                                                                                                                                                              
|10.5        |     | Non-Qualified Deferred Compensation Plan, as amended (filed as Exhibit 10.13 to the Company's 2004 10-K and incorporated herein by reference).                                                                                                                                                                                                           
|10.6        |     | Form of SI International, Inc. Stock Option Agreement Evidencing Grant of Stock Options Under the SI International, Inc. 2002 Amended and Restated Omnibus Stock Incentive Plan, Including Notice of Stock Option
Grant (filed as Exhibit 99.1 to the Company's Current Report on Form 8-K filed on March 17, 2005 and incorporated herein by reference).
|10.7        |     | Amended and Restated Credit Agreement, dated as of February 9, 2005 (filed as Exhibit 99.1 to the Company's Current Report on Form 8-K filed February 15, 2005 and incorporated herein by
reference).                                                                                                                                                    
|10.8        |     | First Amendment to Amended and Restated Credit Agreement, dated February 27, 2006 (filed as Exhibit 10.1 to the Company's Current Report on Form 8-K filed March 3, 2006 and incorporated herein by
reference).                                                                                                                                          
|10.9        |     | Second Amendment to Amended and Restated Credit Agreement, dated June 8, 2007 (filed as Exhibit 10.1 to the Company's Current Report on Form 8-K filed March 3, 2006 and incorporated herein by
reference).                                                                                                                                              
|10.10       |     | Second Amended and Restated Credit Agreement, dated as of February 13, 2008 (filed as Exhibit 99.1 to the Company's Current Report on Form 8-K filed February 19, 2008 and incorporated herein by
reference).                                                                                                                                            

55

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|10.11 |  | Amended and Restated Executive Employment Agreement with S. Bradford Antle (filed as Exhibit 10.10 to the Company's Quarterly Report on Form 10-Q filed on August 8, 2007 and incorporated herein by
reference).
|----- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|10.12 |  | Amended and Restated Executive Employment Agreement with Thomas E. Dunn (filed as Exhibit 10.11 to the Company's Quarterly Report on Form 10-Q filed on August 8, 2007 and incorporated herein by
reference).   
|10.13 |  | Executive Employment Agreement with Thomas E. Lloyd (filed as Exhibit 10.9 to the Third Amendment and incorporated herein by reference).                                                                        
|10.14 |  | Amended and Restated Executive Employment Agreement with Ray J. Oleson (filed as Exhibit 10.13 to the Company's Quarterly Report on Form 10-Q filed August 8, 2007 and incorporated herein by
reference).       
|10.15 |  | Executive Employment Agreement with Leslee H. Gault (filed as Exhibit 10.1 to the Company's Current Report on Form 8-K/A filed on October 2, 2006 and incorporated herein by reference).                        
|10.16 |  | Executive Employment Agreement with Harry D. Gatanas (filed as Exhibit 10.1 to the Company's Current Report on Form 8-K/A filed on November 14, 2005 and incorporated herein by reference).                     
|10.17 |  | Executive Employment Agreement with Marylynn Stowers (filed as Exhibit 10.1 to the Company's Current Report on Form 8-K/A on February 2, 2006 and incorporated herein by reference).                            
|10.18 |  | Executive Employment Agreement with P. Michael Becraft (filed as Exhibit 10.1 to the Company's Current Report on Form 8-K/A filed on February 24, 2006 and incorporated herein by reference).                   
|10.19 |  | Consulting Services Agreement with Walter J. Culver (filed as Exhibit 10.12 to the Company's Annual Report on Form 10-K for the fiscal year ended December 25, 2004 and incorporated herein by
reference).      
|10.20 |  | Form of Indemnification Agreement (filed as Exhibit 10.11 to the Third Amendment and incorporated herein by reference).                                                                                         
|21.1  |  | Subsidiaries of the registrant (*).                                                                                                                                                                             
|23.1  |  | Consent of Ernst & Young LLP (*).                                                                                                                                                                               
|31.1  |  | Certifications of Chief Executive Officer and Chief Financial Officer pursuant to Rule 13a 14(a) as adopted pursuant to Section 302 of the Sarbanes Oxley Act of 2002 (*).                                      
|32.1  |  | Certifications of Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes Oxley Act of 2002 (*).                             

---

56

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INDEX TO FINANCIAL STATEMENTS

|SI INTERNATIONAL, INC.                                                                                                                |  |    
|------------------------------------------------------------------------------------------------------------------------------------- |  | ---
|Report of Independent Registered Public Accounting Firm                                                                               |  | F-2
|Report of Independent Registered Public Accounting Firm on Internal Control over Financial Reporting                                  |  | F-3
|Consolidated Balance Sheets as of December 29, 2007 and December 30, 2006                                                             |  | F-4
|Consolidated Statements of Operations for the fiscal years ended December 29, 2007, December 30, 2006 and December 31, 2005           |  | F-5
|Consolidated Statements of Stockholders' Equity for the fiscal years ended December 29, 2007, December 30, 2006 and December 31, 2005 |  | F-6
|Consolidated Statements of Cash Flows for the fiscal years ended December 29, 2007, December 30, 2006 and December 31, 2005           |  | F-7
|Consolidated Statements of Comprehensive Income for the fiscal years ended December 29, 2007, December 30, 2006 and December 31, 2005 |  | F-8
|Notes to Consolidated Financial Statements                                                                                            |  | F-9

F-1

---





Report of Independent Registered Public Accounting Firm

The
Board of Directors and Stockholders of SI International, Inc.

We
have audited the accompanying consolidated balance sheets of SI International, Inc. and subsidiaries as of December 29, 2007 and December 30, 2006, and the
related consolidated statements of operations, stockholders' equity, cash flows and comprehensive income for the fiscal years ended December 29, 2007, December 30, 2006 and
December 31, 2005. Our audits also included the financial statement schedule listed in the index at Item 15(a)2. These financial statements and schedule are the responsibility of the
Company's management. Our responsibility is to express an opinion on these financial statements based on our audits.

We
conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to
obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in
the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement
presentation. We believe that our audits provide a reasonable basis for our opinion.

In
our opinion, the financial statements referred to above present fairly, in all material respects, the consolidated financial position of SI International, Inc. and subsidiaries
at December 29, 2007 and December 30, 2006, and the consolidated results of its operations and its cash flows for the fiscal years ended December 29, 2007, December 30,
2006 and December 31, 2005, in conformity with U.S. generally accepted accounting principles. Also, in our opinion, the related financial statement schedule, when considered in relation to the
basic financial statements taken as a whole, presents fairly, in all material respects, the information set forth therein.

We
also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), SI International, Inc.'s and subsidiaries' internal
control over financial reporting
as of December 29, 2007, based on criteria established in Internal ControlIntegrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission and
our report dated March 10, 2008 expressed an unqualified opinion thereon.

|                                |  |                     
|------------------------------- |  | --------------------
|                                |  |                     
|                                |  | /s/ERNST & YOUNG LLP
|McLean, Virginia
March 10, 2008 |  |                     

F-2

---





Report of Independent Registered Public Accounting Firm

The
Board of Directors and Stockholders of SI International, Inc.

We
have audited SI International, Inc. and subsidiaries' internal control over financial reporting as of December 29, 2007, based on criteria established in Internal
ControlIntegrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (the COSO criteria). SI International Inc.'s and subsidiaries' management is
responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying
section titledManagement's Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the company's internal
control over financial reporting based on our audit.

We
conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to
obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control
over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and
performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A
company's internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of
financial statements for external purposes in accordance with generally accepted accounting principles. A company's internal control over financial reporting includes those policies and procedures
that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide
reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and
expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention
or timely detection of unauthorized acquisition, use, or disposition of the company's assets that could have a material effect on the financial statements.

Because
of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future
periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

As
indicated in the accompanying section titledManagement's Report on Internal Control over Financial Reporting, management's assessment
of and conclusion on the effectiveness of internal control over financial reporting did not include the internal controls of LOGTEC, Inc., which is included in the 2007 consolidated financial
statements of SI International, Inc. and subsidiaries and constituted approximately 3% and 2% of total and net assets, respectively, as of December 29, 2007 and approximately 7% and 6%
of revenue and net income, respectively, for the fiscal year then ended. Our audit of internal control over financial reporting of SI International, Inc. and subsidiaries also did not include
an evaluation of the internal control over financial reporting of LOGTEC, Inc.

In
our opinion, SI International, Inc. and subsidiaries maintained in all material respects, effective internal control over financial reporting as of December 29, 2007,
based on the COSO criteria.

We
also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheets of SI International, Inc.
and subsidiaries as of December 29, 2007 and December 30, 2006, and the related consolidated statements of operations, stockholders' equity, cash flows and comprehensive income for the
fiscal years ended December 29, 2007, December 30, 2006 and December 31, 2005 and our report dated March 10, 2008 expressed an unqualified opinion thereon.

|                                |  |                     
|------------------------------- |  | --------------------
|                                |  |                     
|                                |  | /s/ERNST & YOUNG LLP
|McLean, Virginia
March 10, 2008 |  |                     

F-3

---





SI International, Inc. and Subsidiaries  Consolidated Balance Sheets  As of December 29, 2007 and December 30, 2006  (Amounts in thousands, except share data)

|                                           |                                                                                                                                                                                           | December 29, 2007 |         | December 30, 2006
|------------------------------------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------- | ------- | -----------------
|Assets                                     |                                                                                                                                                                                           |                   |         |                  
|Current assets:                            |                                                                                                                                                                                           |                   |         |                  
|                                           | Cash and cash equivalents                                                                                                                                                                 |                   | $       | 13,129           
|                                           | Accounts receivable, net                                                                                                                                                                  |                   |         | 117,098          
|                                           | Other current assets                                                                                                                                                                      |                   |         | 12,511           
|                                           |                                                                                                                                                                                           |                   |         |                  
|Total current assets                       |                                                                                                                                                                                           |                   | 142,738 |                  
|Property and equipment, net                |                                                                                                                                                                                           |                   | 15,080  |                  
|Intangible assets, net                     |                                                                                                                                                                                           |                   | 26,583  |                  
|Other assets                               |                                                                                                                                                                                           |                   | 11,572  |                  
|Goodwill                                   |                                                                                                                                                                                           |                   | 265,474 |                  
|                                           |                                                                                                                                                                                           |                   |         |                  
|Total assets                               |                                                                                                                                                                                           | $                 | 461,447 |                  
|                                           |                                                                                                                                                                                           |                   |         |                  
|Liabilities and stockholders' equity       |                                                                                                                                                                                           |                   |         |                  
|Current liabilities:                       |                                                                                                                                                                                           |                   |         |                  
|                                           | Accounts payable                                                                                                                                                                          |                   | $       | 26,000           
|                                           | Accrued expenses and other current liabilities                                                                                                                                            |                   |         | 35,172           
|                                           | Note payableline of credit                                                                                                                                                               |                   |         | 20,000           
|                                           | Note payableformer owner of acquired business                                                                                                                                            |                   |         |                 
|                                           | Current portion of long-term debt                                                                                                                                                         |                   |         | 1,004            
|                                           |                                                                                                                                                                                           |                   |         |                  
|Total current liabilities                  |                                                                                                                                                                                           |                   | 82,176  |                  
|Long-term debt, net of current portion     |                                                                                                                                                                                           |                   | 93,261  |                  
|Deferred income tax                        |                                                                                                                                                                                           |                   | 14,241  |                  
|Other long-term liabilities                |                                                                                                                                                                                           |                   | 11,066  |                  
|Stockholders' equity:                      |                                                                                                                                                                                           |                   |         |                  
|                                           | Common stock$0.01 par value per share; 50,000,000 shares authorized; 13,087,164 and 12,967,377 shares issued and outstanding as of December 29, 2007 and December 30, 2006,
respectively |                   |         | 131              
|                                           | Additional paid-in capital                                                                                                                                                                |                   |         | 188,308          
|                                           | Accumulated other comprehensive (loss) income                                                                                                                                             |                   |         | (1,094           
|                                           | Retained earnings                                                                                                                                                                         |                   |         | 73,358           
|                                           |                                                                                                                                                                                           |                   |         |                  
|Total stockholders' equity                 |                                                                                                                                                                                           |                   | 260,703 |                  
|                                           |                                                                                                                                                                                           |                   |         |                  
|Total liabilities and stockholders' equity |                                                                                                                                                                                           | $                 | 461,447 |                  
|                                           |                                                                                                                                                                                           |                   |         |                  

The
accompanying notes are an integral part of these consolidated balance sheets.

F-4

---





SI International, Inc. and Subsidiaries  Consolidated Statements of Operations  For the fiscal years ended December 29, 2007, December 30, 2006 and December 31, 2005  (Amounts in thousands,
except per share data)

|                                         |                                             | Fiscal Year |        
|---------------------------------------- | ------------------------------------------- | ----------- | -------
|
|Revenue                                  |                                             | $           | 510,820
|Costs and expenses:                      |                                             |             |        
|                                         | Cost of services                            |             |        
|                                         | Selling, general and administrative         |             |        
|                                         | Depreciation and amortization               |             |        
|                                         | Amortization of intangible assets           |             |        
|                                         |                                             |             |        
|Total operating expenses                 |                                             |             | 472,186
|                                         |                                             |             |        
|Income from operations                   |                                             |             | 38,634 
|Other income                             |                                             |             | 258    
|Interest expense, net                    |                                             |             | (7,154 
|                                         |                                             |             |        
|Income before provision for income taxes |                                             |             | 31,738 
|Provision for income taxes               |                                             |             | 12,445 
|                                         |                                             |             |        
|Net income                               |                                             | $           | 19,293 
|                                         |                                             |             |        
|Earnings per common share:               |                                             |             |        
|                                         | Basic                                       |             | $      
|                                         | Diluted                                     |             | $      
|                                         | Basic weighted-average shares outstanding   |             |        
|                                         | Diluted weighted-average shares outstanding |             |        

The
accompanying notes are an integral part of these consolidated statements.

F-5

---





SI International, Inc. and Subsidiaries  Consolidated Statements of Stockholders' Equity  For the fiscal years ended December 29, 2007, December 30, 2006 and December 31, 2005  (Amounts in
thousands, except share data)

|                                                          |  | Stockholders' equity | 
|--------------------------------------------------------- |  | -------------------- | 
|
|Balance, December 25, 2004                                |  | 11,047,533           | 
|Exercise of stock options                                 |  | 293,689              | 
|Amortization of deferred compensation                     |  |                     | 
|Stock-based compensation                                  |  |                     | 
|Option exercise tax effect                                |  |                     | 
|Other                                                     |  |                     | 
|Net income                                                |  |                     | 
|                                                          |  |                      | 
|Balance, December 31, 2005                                |  | 11,341,222           | 
|Exercise of stock options and vesting of restricted stock |  | 426,155              | 
|Offering proceeds, net of offering costs                  |  | 1,200,000            | 
|Stock-based compensation                                  |  |                     | 
|Option exercise tax effect                                |  |                     | 
|Unrealized gain on interest rate swap                     |  |                     | 
|Tax reserve adjustment                                    |  |                     | 
|Net income                                                |  |                     | 
|                                                          |  |                      | 
|Balance, December 30, 2006                                |  | 12,967,377           | 
|Exercise of stock options and vesting of restricted stock |  | 119,787              | 
|Stock-based compensation                                  |  |                     | 
|Option exercise tax effect                                |  |                     | 
|Unrealized loss on interest rate swap                     |  |                     | 
|Net income                                                |  |                     | 
|                                                          |  |                      | 
|Balance, December 29, 2007                                |  | 13,087,164           | 
|                                                          |  |                      | 

The
accompanying notes are an integral part of these consolidated statements.

F-6

---





SI International, Inc. and Subsidiaries  Consolidated Statements of Cash Flows  For the fiscal years ended December 29, 2007, December 30, 2006 and December 31, 2005  (Amounts in thousands)

|                                                   |                                                                                   | Fiscal Year                                                |       
|-------------------------------------------------- | --------------------------------------------------------------------------------- | ---------------------------------------------------------- | ------
|
|Cash flows from operating activities:              |                                                                                   |                                                            |       
|                                                   | Net income                                                                        |                                                            | $     
|                                                   | Adjustments to reconcile net income to net cash provided by operating activities: |                                                            |       
|                                                   |                                                                                   | Depreciation and amortization                              |       
|                                                   |                                                                                   | Amortization of intangible assets                          |       
|                                                   |                                                                                   | Loss on disposal of fixed assets                           |       
|                                                   |                                                                                   | Stock-based compensation                                   |       
|                                                   |                                                                                   | Deferred income tax provision                              |       
|                                                   |                                                                                   | Amortization of deferred financing costs and debt discount |       
|                                                   | Changes in operating assets and liabilities, net of effect of acquisitions:       |                                                            |       
|                                                   |                                                                                   | Accounts receivable, net                                   |       
|                                                   |                                                                                   | Other current assets                                       |       
|                                                   |                                                                                   | Other assets                                               |       
|                                                   |                                                                                   | Accounts payable and accrued expenses                      |       
|                                                   |                                                                                   | Deferred revenue                                           |       
|                                                   |                                                                                   | Other long-term liabilities                                |       
|                                                   |                                                                                   |                                                            |       
|                                                   | Net cash provided by operating activities                                         |                                                            |       
|                                                   |                                                                                   |                                                            |       
|Cash flows from investing activities:              |                                                                                   |                                                            |       
|                                                   | Purchase of property and equipment                                                |                                                            |       
|                                                   | Proceeds from sale of marketable securities                                       |                                                            |       
|                                                   | Purchase of marketable securities                                                 |                                                            |       
|                                                   | Former owner payable                                                              |                                                            |       
|                                                   | Cash paid for business acquisitions, net of cash assumed                          |                                                            |       
|                                                   |                                                                                   |                                                            |       
|                                                   | Net cash used in investing activities                                             |                                                            |       
|                                                   |                                                                                   |                                                            |       
|Cash flows from financing activities:              |                                                                                   |                                                            |       
|                                                   | Proceeds from issuance of common stock, net of offering costs                     |                                                            |       
|                                                   | Proceeds from exercise of stock options                                           |                                                            |       
|                                                   | Income tax benefit for stock option exercises                                     |                                                            |       
|                                                   | Borrowings under line of credit                                                   |                                                            |       
|                                                   | Repayments under line of credit                                                   |                                                            |       
|                                                   | Payments of debt issuance fees                                                    |                                                            |       
|                                                   | Proceeds from long-term debt                                                      |                                                            |       
|                                                   | Repayments of long-term debt                                                      |                                                            |       
|                                                   | Repayments of capital lease obligations                                           |                                                            |       
|                                                   |                                                                                   |                                                            |       
|                                                   | Net cash provided by financing activities                                         |                                                            |       
|                                                   |                                                                                   |                                                            |       
|                                                   | Net change in cash and cash equivalents                                           |                                                            |       
|Cash and cash equivalents, beginning of period     |                                                                                   |                                                            | 19,457
|                                                   |                                                                                   |                                                            |       
|Cash and cash equivalents, end of period           |                                                                                   | $                                                          | 13,129
|                                                   |                                                                                   |                                                            |       
|Supplemental disclosures of cash flow information: |                                                                                   |                                                            |       
|                                                   | Cash payments for interest                                                        |                                                            | $     
|                                                   | Cash payments for income taxes                                                    |                                                            | $     
|Supplemental disclosure of noncash activities:     |                                                                                   |                                                            |       
|                                                   | Equipment acquired under capital leases                                           |                                                            | $     

The
accompanying notes are an integral part of these consolidated statements.

F-7

---





SI International, Inc. and Subsidiaries  Consolidated Statements of Comprehensive Income  For the fiscal years ended December 29, 2007, December 30, 2006 and December 31, 2005  (Amounts in
thousands)

|                                                        |  | Fiscal Year
|------------------------------------------------------- |  | -----------
|
|Net income                                              |  | $          
|Unrealized (loss) gain on interest rate swap agreements |  |            
|                                                        |  |            
|Comprehensive income                                    |  | $          
|                                                        |  |            

The
accompanying notes are an integral part of these consolidated statements.

F-8

---





SI International, Inc.        Notes to Consolidated Financial Statements

1. Business:

Throughout this document, we occasionally distinguish SI International, Inc., as a company separate from its subsidiaries, and SI
International, Inc., as a company combined with its subsidiaries. In order to clarify which entity we are referring to in various discussions, we use the terms "SI International, Inc."
and "SI International" to refer to SI International, Inc. without its subsidiaries. All other references, including "SI," "the Company," "we" and "us" refer to SI International
and its subsidiaries.

SI
International was incorporated on October 14, 1998, under the laws of the state of Delaware. The Company is a provider of information technology and network solutions with the
Federal Government as a major client. The Company offers a broad spectrum of solutions and services, including design, development, implementation and operations to assist clients in achieving their
missions. The Company combines technological and industry experience to provide solutions through service offerings in the areas of program management and acquisition support, integrated solutions
development, information security, records management, learning solutions, systems engineering, network solutions and mission-critical outsourcing.

On
January 1, 2001, the Company separated its telecommunications operations, which it obtained pursuant to an acquisition in fiscal year 2000, by contributing the net assets of
the telecommunications operations to a sister company, SI Telecom. In October 2002, SI Telecom was merged back into SI International, such that SI Telecom became a wholly-owned
subsidiary of SI International. On December 15, 2006, SI International merged two of its wholly-owned subsidiaries, SI International Engineering Inc., a Colorado
corporation ("Engineering") and SI International Telecom Corporation, a Delaware corporation, into SI International as part of an internal consolidation of legal entities. The mergers
were completed according to an Agreement and Plan of Merger under which Engineering and SI International Telecom Corporation were merged into SI International, which continues as the
surviving corporation.

Since
November 12, 2002, our common stock has been publicly traded on the NASDAQ Stock Market under the symbol "SINT". The completion of the initial public offering in November of
2002 raised $47.1 million (after offering costs) in equity capital through the sale of 3,850,000 shares of common stock. On October 6, 2004, the Company completed its secondary offering
which raised $51.2 million (after offering costs) cash through the sale of 2,520,000 shares of common stock. On April 7, 2006, we raised $40.3 million (after offering costs)
through the sale of 1,200,000 shares of common stock.

2. Summary of significant accounting policies:

Principles of consolidation

The accompanying consolidated financial statements include the accounts of the Company and its wholly and majority-owned subsidiaries. All significant
intercompany transactions and accounts have been eliminated in consolidation.

Use of estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the

F-9

---



SI International, Inc.

Notes to Consolidated Financial Statements (Continued)

2. Summary of significant accounting policies: (Continued)

financial
statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Reporting periods

The Company's fiscal year ends on the Saturday closest to, but not falling after, December 31 of that year.Fiscal years 2006 and
2007 include 52 weeks. Fiscal year 2005 includes 53 weeks.The Company's quarters end on the Saturday nearest to the applicable quarterly month-end.

Cash and cash equivalents

The Company considers all investments with original maturities of three months or less at the date of purchase to be cash equivalents.

Marketable securities

During fiscal years 2006 and 2007, the Company invested in auction rate securities which are associated with municipal bond offerings. At the end of fiscal years
2006 and 2007, all of the auction rate securities invested in during the fiscal period were sold prior to the end of the fiscal year.

Revenue recognition

The Company recognizes revenue when a contract has been executed, the contract price is fixed and determinable, delivery of services or products has occurred, and
collectibility of the contract price is considered probable and can be reasonably estimated. Revenue is earned under cost reimbursable, time and materials and fixed price contracts.

Under
cost reimbursable contracts, the Company is reimbursed for allowable costs, and paid a fee, which may be fixed or performance-based. Revenues on cost reimbursable contracts are
recognized as costs are incurred plus an estimate of applicable fees earned. The Company considers fixed fees under cost reimbursable contracts to be earned in proportion of the allowable costs
incurred in performance of the contract. For certain cost reimbursable contracts that include performance based fee incentives, the Company recognizes the relevant portion of the expected fee to be
awarded by the customer at the time such fee can be reasonably estimated, based on factors such as the Company's prior award experience and communications with the customer regarding performance.
Other performance based fees are recognized upon customer approval.

Revenue
on time and materials contracts are recognized based on direct labor hours expended at contract billing rates and adding other billable direct costs. For fixed price contracts
that are based on unit pricing or level of effort, the Company recognizes revenue for the number of units delivered in any given fiscal period. For fixed price contracts in which the Company is paid a
specific amount to provide a particular service for a stated period of time, revenue is recognized ratably over the service period.

For
fixed price contracts that provide for the delivery of a specific product with related customer acceptance provisions, revenues are recognized upon product delivery and customer
acceptance. However, a significant portion of the Company's fixed price-completion contracts involve the design and development of complex, client systems. For those contracts that are within scope of
SOP 81-1,Accounting for Performance of Construction-Type and Certain Production-Type Contracts, revenue is

F-10

---



SI International, Inc.

Notes to Consolidated Financial Statements (Continued)

2. Summary of significant accounting policies: (Continued)

recognized
on the percentage-of-completion method using costs incurred in relation to total estimated costs.

The
Company's contracts with agencies of the government are subject to periodic funding by the respective contracting agency. Funding for a contract may be provided in full at inception
of the contract or ratably throughout the contract as the services are provided. In evaluating the probability of funding for purposes of assessing collectibility of the contract price, the Company
considers its previous experiences with its customers, communications with its customers regarding funding status, and the Company's knowledge of available funding for the contract or program. If
funding is not assessed as probable, revenue recognition is deferred until realization is deemed probable.

Contract
revenue recognition inherently involves estimation, including the contemplated level of effort to accomplish the tasks under the contract, the cost of the effort, and an ongoing
assessment of progress toward completing the contract. From time to time, as part of the normal management processes, facts develop that require revisions to estimated total costs or revenues
expected. The cumulative impact of any revisions to estimates and the full impact of anticipated losses on contracts accounted for under SOP 81-1 are recognized in the period in
which they become known. Projected losses on all other contracts are recognized as the services and materials are provided.

The
allowability of certain costs under government contracts is subject to audit by the government. Certain indirect costs are charged to contracts using provisional or estimated
indirect rates, which are subject to later revision based on government audits of those costs. Management is of the opinion that costs subsequently disallowed, if any, would not be significant.

Significant customers

Revenue generated from contracts with the Federal Government, both directly and through other prime contractors, accounted for a significant percentage of
revenues in the fiscal years 2007, 2006 and 2005.

% of revenues
Fiscal year2007

2006

2005Department of Defense

45.5
%
46.6
%
46.9
%Federal civilian agencies

53.3

51.9

51.2Commercial entities

1.2

1.5

1.9Total revenue

100.0
%
100.0
%
100.0
%


We
had only one contract that generated more than 10% of our revenue for fiscal years 2007, 2006 and 2005. For fiscal years 2007, 2006 and 2005, revenue from our C4I2SR contract with the
U.S. Air Force Space Command represented approximately 17%, 21% and 21%, respectively, of total revenue.

Concentrations of Credit risk

The Company's assets that are exposed to credit risk consist primarily of cash and cash equivalents and accounts receivable. Accounts receivable consist primarily
of billed and unbilled amounts, including indirect cost rate variances, due from various agencies of the Federal Government or prime contractors

F-11

---



SI International, Inc.

Notes to Consolidated Financial Statements (Continued)

2. Summary of significant accounting policies: (Continued)

doing
business with the Federal Government, and other commercial customers. The Company historically has not experienced significant losses related to accounts receivable and therefore, believes that
credit risk related to accounts receivable is minimal. The Company maintains cash balances that may at times exceed federally insured limits. The Company maintains this cash at high-credit
quality institutions and, as a result, believes credit risk related to its cash is minimal.

Accounts receivable and allowance for doubtful accounts

Accounts receivable are recorded at their face amount less an allowance for doubtful accounts. The Company maintains an allowance for doubtful accounts at an
amount that it estimates to be sufficient to cover the risk of collecting less than full payment on receivables. The Company reevaluates its receivables on a monthly basis, especially receivables that
are past due, and reassesses the allowance for doubtful accounts based on specific client collection issues.

Property and equipment

Property and equipment are stated at historical cost, net of accumulated depreciation and amortization. Depreciation and amortization are computed generally using
a straight-line method over the estimated useful lives of the related assets, as follows:

Software, computers and equipment

3-5 yearsFurniture and fixtures

5-7 yearsLeasehold improvements

Shorter of the estimated useful life of the asset or the lease term


Deferred financing costs

Costs incurred in raising debt are deferred and amortized as interest expense over the term of the related debt using the effective interest method. These
deferred costs are reflected as a component of other assets in the accompanying consolidated balance sheets. The deferred financing costs consist of the following (in thousands):

December 29,
2007

December 30,
2006Deferred loan costs

$
5,635

$
5,527Accumulated amortization


(3,987
)

(3,363
)Deferred financing costs, net

$
1,648

$
2,164


During
2006, the Company wrote off approximately $1,131,000 of deferred loan costs related to the prepayments of its term loan. Amortization of deferred financing costs was $624,000,
$690,000, and $705,000 in fiscal years 2007, 2006 and 2005, respectively.

Impairment of long-lived assets

Long-lived assets, including property and equipment, are reviewed for impairment whenever events or changes in circumstances indicate that the
carrying amount should be addressed pursuant to Statement of Financial Accounting Standards (SFAS) No. 144,Accounting for the Impairment or

F-12

---



SI International, Inc.

Notes to Consolidated Financial Statements (Continued)

2. Summary of significant accounting policies: (Continued)

Disposal of Long-Lived Assets and for Long-Lived Assets. Pursuant to SFAS No. 144, impairment is determined by comparing the carrying value of
these long-lived assets to an estimate of the future undiscounted cash flows expected to result from the use of the assets and eventual disposition. In the event impairment exists, a loss
is recognized based on the amount by which the carrying value exceeds the fair value of the asset, which is generally determined by using quoted market prices or valuation techniques such as the
discounted present value of expected future cash flows, appraisals, or other pricing models as appropriate. The Company believes that no such impairment existed during the fiscal years ended
December 29, 2007 and December 30, 2006. In the event that there are changes in the planned use of the Company's long-term assets or its expected future undiscounted cash
flows are reduced significantly, the Company's assessment of its ability to recover the carrying value of these assets could change.

Goodwill

Goodwill represents the excess of cost over net assets acquired resulting from the Company's acquisitions. Effective January 1, 2002, the Company adopted
SFAS No. 142,Goodwill and Other Intangible Assets. SFAS No. 142 requires the use of a non-amortization approach to account
for purchased goodwill and certain intangibles. Under the non-amortization approach, goodwill and certain intangibles are not amortized into results of operations, but instead are reviewed
for impairment at least annually and written down and charged to operations only in the periods in which the recorded value of goodwill and certain intangibles is more than its fair value. Each year,
the Company completed its annual impairment test of goodwill. The analyses indicated that no impairment of goodwill existed for either of the fiscal years ended December 29, 2007 and
December 30, 2006; however, future impairment reviews may result in the recognition of such impairment.

The
total amount of goodwill as of December 29, 2007 is $265.5 million, of which $219.3 million is expected to be deductible for income tax purposes in future
periods.

Intangible assets

Intangible assets consist of the following (in thousands):

December 29,
2007

December 30,
2006Contractual customer relationships

$
36,547

$
26,336Non-compete agreements


150


150Total intangible assets


36,697


26,486Less: accumulated amortization


(10,114
)

(6,068
)Intangible assets, net

$
26,583

$
20,418


Intangible
assets from acquisitions, which consist primarily of contractual customer relationships, are amortized utilizing an accelerated method over 6 to 14 years, based on
their estimated useful lives. The weighted-average amortization period of total intangible assets as of December 29, 2007 is 9.2 years. Amortization expense is estimated to be
$4.3 million, $3.8 million, $3.4 million, $2.9 million and $2.7 million for the fiscal years 2008, 2009, 2010, 2011 and 2012, respectively.

F-13

---



SI International, Inc.

Notes to Consolidated Financial Statements (Continued)

2. Summary of significant accounting policies: (Continued)

Fair value of financial instruments

The Company's financial instruments consist primarily of cash and cash equivalents, marketable securities, accounts receivable, accounts payable, credit
facilities, and long-term debt. In management's opinion, the carrying amounts of these financial instruments approximate their fair values at December 29, 2007 and
December 30, 2006.

Stock-based compensation

Effective January 1, 2006, the Company adopted the provisions of SFAS No. 123R,Share Based Paymentusing the modified prospective transition method. Due to the use of the modified prospective method, prior interim periods and fiscal years do not reflect any restated amounts. The Company accelerated
the vesting of all unvested stock options previously awarded to employees, officers and directors in December 2005; thus, the Company had no unvested stock options on January 1, 2006. Since
January 1, 2006, the Company has issued 303,425 stock options through December 29, 2007. The total stock compensation expense recognized during fiscal years 2007 and 2006 was
$0.7 million and $0.2 million, respectively. The total remaining unrecognized compensation expense related to the unvested options as of December 29, 2007 was $2.4 million,
which will be recognized over the weighted average period of 2.5 years.

From
January 1, 2006 through December 29, 2007, the Company has issued 108,025 shares of restricted stock to directors and employees under its 2002 Amended and Restated
Omnibus Stock Incentive Plan. The fair value of the restricted stock awards is determined based on the grant date stock price. The compensation expense for restricted stock awards is recognized on a
straight-line basis over the vesting term which is typically five years beginning on the date of grant. The total compensation expense recognized during fiscal years 2007 and 2006 was
$0.5 million and $0.1 million, respectively. The total remaining unrecognized compensation expense related to the unvested restricted stock awards as of December 29, 2007 was
$2.0 million, which will be recognized over the weighted average period of 2.5 years.

Prior
to the adoption of SFAS No. 123R, the Company accounted for stock-based compensation using the intrinsic value method prescribed in APB Opinion No. 25 and related
interpretations. Accordingly, compensation expense for stock options was measured as the excess, if any, of the fair market value of the Company's stock at the date of the grant over the exercise
price of the related option. The following table illustrates the effect on net income and earnings per share if the

F-14

---



SI International, Inc.

Notes to Consolidated Financial Statements (Continued)

2. Summary of significant accounting policies: (Continued)

compensation
costs for the Company's stock options had been determined based on SFAS No. 123,Accounting for Stock Based Compensation.

Fiscal Year2005Net incomeas reported

$
16,937Add: Total stock-based employee compensation expense as reported under intrinsic value method (APB No. 25) for all awards, net of tax


371Deduct: Total stock-based employee compensation expense determined under fair value based method (SFAS No. 123) for all awards, net of tax


(10,137
)Net incomePro forma

$
7,171Basic earnings per shareas reported

$
1.51Diluted earnings per shareas reported

$
1.45Basic earnings per sharePro forma

$
0.64Diluted earnings per sharePro forma

$
0.61


The
fair value of each option is estimated on the date of grant using the Black-Scholes option-pricing model with the following assumptions used for grants during the fiscal years ended
December 29, 2007, December 30, 2006 and December 31, 2005:

Fiscal Year2007

2006

2005Risk-free interest rate

4.48%-5.07%

4.53%-5.07%

3.99%-4.39%Expected life of options

5 years

5 years

5-7 yearsExpected stock price volatility

35%-44%

38%-44%

45%-50%Expected dividend yield

0%

0%

0%


The
risk-free interest rate is based on U.S. Treasury yields in effect at the time of grant over the expected term of the option. The expected life of options is derived from
the Company's historical option exercise data. The expected stock price volatility is based on the historical volatility of the Company's common stock.

Prior
to the adoption of SFAS No. 123R, the Company presented all tax benefits related to the exercise of stock options as operating cash flows in the consolidated statement of
cash flows. SFAS No. 123R requires the cash flows resulting from the tax benefits generated from tax deductions in excess of the compensation costs recognized for those options to be classified
as financing cash flows.

Income taxes

Income taxes are accounted for using an asset and liability approach that requires the recognition of taxes payable or refundable for the current year and
deferred tax liabilities and assets for the future tax consequences of events that have been recognized in the Company's financial statements or tax returns. The measurement of current and deferred
tax liabilities and assets are based on provisions of the enacted tax law; the effects of future changes in tax laws or rates are not considered. Net deferred

F-15

---



SI International, Inc.

Notes to Consolidated Financial Statements (Continued)

2. Summary of significant accounting policies: (Continued)

tax
assets are reduced, if necessary, by a valuation allowance for the amount of any tax benefits that, based on available evidence, are not expected to be realized.

Earnings per share

The Company has applied SFAS No. 128,Earnings Per Share, for all fiscal years presented in these
consolidated financial statements. SFAS No. 128 requires disclosure of basic and diluted earnings per share or EPS. Basic EPS is computed by dividing reported earnings available to common
stockholders by the weighted average number of shares outstanding without consideration of common stock equivalents or other potentially dilutive securities. Diluted EPS gives effect to common stock
equivalents and other potentially dilutive securities outstanding during the period.

The
following details the computation of net income per common share:

Fiscal Year2007

2006

2005Net income

$
19,293

$
20,153

$
16,937Weighted average share calculation:Basic weighted average shares outstanding


13,030


12,507


11,185Treasury stock effect of stock options and restricted stock


274


389


505Diluted weighted average shares outstanding


13,304


12,896


11,690


The
total number of weighted average common stock equivalents excluded from the diluted per share computations due to their anti-dilutive effects for the years ended
December 29, 2007, December 30, 2006 and December 31, 2005 were 270,548, 22,250, and 83,707, respectively.

Derivative Instrument and Hedging Activities

The Company accounts for derivative instruments and hedging activities in accordance with SFAS No. 133,Accounting for Derivative
Instruments and Hedging Activities, as amended. Derivatives are recognized as either assets or liabilities in the consolidated balance sheet, and gains and losses are
recognized based on changes in the fair values. Gains and losses on derivatives designated as a hedge, or deemed to be an effective hedge, are deferred in accumulated other comprehensive income in the
accompanying consolidated balance sheets, and then recognized upon contract completion. Gains and losses on derivatives that are not designated as a hedge, or that are not intended to be an effective
hedge, are recognized upon the changes in fair values and are recorded in the accompanying consolidated statements of operations. The classification of gains and losses resulting from the changes in
fair values is dependent on the intended use of the derivative and its resulting designation. The Company uses the change in variable cash flow method to measure the effectiveness of its hedges.

From
time to time, the Company will enter into interest rate swap agreements to manage exposure to fluctuations in rates on its variable rate debt. These agreements effectively allow the
Company to exchange variable rate debt for fixed rate debt. The Company enters into such derivative instrument agreements only to hedge cash flows. The Company does not hold or issue such financial
instruments for trading purposes, nor is it a party to leveraged derivatives.

F-16

---



SI International, Inc.

Notes to Consolidated Financial Statements (Continued)

2. Summary of significant accounting policies: (Continued)

Nonqualified Deferred Compensation Plan

The Company maintains a non-qualified defined contribution supplemental retirement savings plan for certain key employees whereby participants may
elect to defer and contribute a portion of their compensation, as permitted by the plan. The Company maintains supplemental retirement savings plan assets that are accounted for in accordance with
EITF Issue No. 97-14,Accounting for Deferred Compensation Arrangements Where Accounts are Held in a Rabbi Trust and Invested, and
the underlying assets are held in a Rabbi Trust. The participants can direct their investments in the nonqualified deferred compensation plan.

A
rabbi trust is a grantor trust established to fund compensation for a select group of management. The assets of this trust are available to satisfy the claims of general creditors in
the event of bankruptcy of the Company. The assets held by the Rabbi Trust, which are classified as trading securities, are recorded at fair value in the consolidated financial statements as
nonqualified deferred compensation
plan assets. The participants' investments are recorded at fair value as nonqualified deferred compensation plan obligations.

Segment reporting

SFAS No. 131,Disclosure about Segments of an Enterprise and Related Information, establishes standards for
the way that public business enterprises report information about operating segments in annual financial statements and requires that these enterprises report selected information about operating
segments in interim financial reports. SFAS No. 131 also establishes standards for related disclosures about products and services, geographic areas and major customers. Management has
concluded that the Company operates in one segment based upon the information used by management in evaluating the performance of its business and allocating resources and capital.

Reclassifications

Certain prior year amounts have been reclassified to conform to the presentation of the current year.

New accounting pronouncements

In July 2006, the Financial Accounting Standards Board (FASB) issued Interpretation No. 48,Accounting for Uncertainty in Income
Taxes, an interpretation of FASB Statement No. 109, Accounting for Income Taxes. FIN 48 provides guidance on recognition, derecognition, measurement,
classification, interest and penalties, accounting in interim periods, disclosure and transition. FIN 48 requires an entity to recognize the financial statement impact of a tax position when it
is more likely than not that the position will be sustained upon examination. The amount recognized is measured as the largest amount of benefit that is greater than fifty percent likely of being
realized upon ultimate settlement. In addition, FIN 48 permits an entity to recognize interest and penalties related to tax uncertainties either as income tax expense or operating expenses.

The
Company adopted the provisions of FIN 48 at the start of fiscal year 2007. The Company believes that its income tax filing positions will be sustained on audit and does not
anticipate any adjustments that will result in a material effect on its financial position, results of operations or cash flows. Therefore, there was no impact at the adoption of FIN 48 and no
reserves for uncertain income

F-17

---



SI International, Inc.

Notes to Consolidated Financial Statements (Continued)

2. Summary of significant accounting policies: (Continued)

tax
position have been recorded. The Company had recognized interest and penalties related to tax uncertainties as income tax expense and continued this treatment upon adoption of FIN 48.

The
Company is subject to U.S. federal income tax as well as to income tax of multiple state jurisdictions. Federal income tax returns of the Company are subject to IRS examination for
the 2003 through 2006 tax years. State income tax returns are subject to examination for a period of three to six years after filing.

In
September 2006, the FASB issued SFAS No. 157,Fair Value Measurements. SFAS No. 157 defines fair value, establishes a
framework for measuring fair value and expands disclosures about fair value measurements. SFAS No. 157 is effective for fiscal years beginning after December 15, 2007. The adoption of
SFAS No. 157 is effective with the start of fiscal year 2008 for the Company. The Company believes that the adoption of this statement will not have a material effect on its financial
condition, results of operations or cash flows. On February 12, 2008, the FASB issued FASB Staff Position No. FAS 157-2, Effective Date of FASB Statement No. 157 (the
FSP). The FSP amends FASB Statement No. 157, Fair Value Measurements (Statement 157), to delay the effective date of Statement 157 for nonfinancial assets and nonfinancial liabilities, except
for items that are recognized or disclosed at fair value in the financial statements on a recurring basis (that is, at least annually). For items within its scope, the FSP defers the effective date of
Statement 157 to fiscal years beginning after November 15, 2008, and interim periods within those fiscal years.

In
February 2007, the FASB issued SFAS No. 159,The Fair Value Option for Financial Assets and Financial LiabilitiesIncluding an amendment of
FASB Statement No. 115. SFAS No. 159 permits entities to choose to measure certain financial instruments and other items at fair value. The fair value option
generally may be applied instrument by instrument, is irrevocable, and is applied only to entire instruments and not to portions of instruments. SFAS No. 159 is effective for financial
statements issued for fiscal years beginning after November 15, 2007. The Company believes that the adoption of this statement will not have a material impact on its financial condition,
results of operations or cash flows.

In
December 2007, the FASB issued SFAS No. 141 (revised 2007),Business Combinations. SFAS No. 141R establishes principles
and requirements for how companies recognize and measure identifiable assets acquired, liabilities assumed, and any noncontrolling interest in connection with a business combination; recognize and
measure the goodwill acquired in a business combination; and determine what information to disclose to enable users of the financial statements to evaluate the nature and financial effects of the
business combination. SFAS No. 141R is effective for business combinations for which the acquisition date is on or after the beginning of the first annual reporting period beginning on
or after December 15, 2008. The Company has not yet evaluated what impact, if any, SFAS No. 141R will have on its results of operations or financial position.

3. Acquisitions:

On June 8, 2007, the Company acquired LOGTEC, Inc., an Ohio corporation ("LOGTEC"), pursuant to a Share Purchase Agreement dated May 23, 2007
(the "LOGTEC Agreement"). LOGTEC specializes in acquisition and program management, systems and network engineering and integration, software and web-based application development, data
management and warehousing, information assurance, and training. LOGTEC's largest clients include the Air Force Materiel Command (AFMC) and Naval Air Systems Command (NAVAIR).

F-18

---



SI International, Inc.

Notes to Consolidated Financial Statements (Continued)

3. Acquisitions: (Continued)

Under
the terms of the LOGTEC Agreement, the Company acquired all of the outstanding capital stock of LOGTEC for $59.7 million in cash, including $0.5 million of
transaction costs, of which $5.9 million was deposited in escrow for 15 months after closing in order to secure post-closing indemnity obligations of the sellers.
Additionally, the Company has made an election under Section 338(h)(10) of the Internal Revenue Code, which effects the after tax valuation of
the LOGTEC acquisition. The transaction was funded through $9.7 million of cash-on-hand, borrowings under our credit facility, which consisted of increasing the term
loan by $25 million and drawing $25 million under our revolving line of credit. LOGTEC's trailing revenue for the year ending December 31, 2006 was approximately
$54 million (unaudited).

Based
on the final valuation, management has allocated approximately $44.9 million of the purchase price to goodwill based primarily on the excess of the purchase price over the
estimated fair value of net assets acquired. Approximately $10.2 million of the purchase price has been assigned to the identifiable intangible assets of contractual customer relationships.
Each customer relationship, which includes each customer's contract, is being amortized on an accelerated basis over their remaining useful life of 10 years.

The
total purchase price paid, including transaction costs of $0.5 million, has been allocated as follows (in thousands):

Cash and cash equivalents

$
144Accounts receivable


12,269Other current assets


222Property and equipment


314Accounts payable and accrued expenses


(8,383
)Intangible assets


10,212Goodwill


44,894Total consideration

$
59,672


On
February 27, 2006, we completed the purchase of Zen Technology, Inc. (Zen), a provider of critical IT services, specializing in managed network services, information
assurance, software development and systems engineering, database and systems administration and IT consulting to various U.S. Government agencies. Pursuant to the terms of the Zen Agreement, we
acquired all of the outstanding capital stock of Zen for $60 million in cash. Approximately $47.8 million of the purchase consideration
has been allocated to goodwill based primarily on the excess purchase price over the estimated fair value of net assets acquired. In addition, approximately $6.9 million and $0.2 million
of the purchase price have been assigned to the identifiable intangible assets of contractual relationships and non-competition agreements, respectively. The contractual relationships are
being amortized on an accelerated basis over the remaining useful life of 9 years and the non-competition agreements are being amortized on a straight-line basis over
3 years.

On
February 9, 2005, we completed the purchase of Shenandoah Electronic Intelligence, Inc. (SEI). SEI is a provider of critical business process outsourcing primarily for
the Department of Homeland Security (DHS). SEI's services include: data and records management; applications processing; file and mail management; analytical support services; and secure optical card
processing at one of the largest facilities of its kind. Under the terms of the definitive stock purchase agreement, we acquired SEI for $75 million in cash, subject to certain adjustments
totaling approximately $0.6 million.

F-19

---



SI International, Inc.

Notes to Consolidated Financial Statements (Continued)

3. Acquisitions: (Continued)

Approximately
$52.6 million of the purchase consideration has been allocated to goodwill based primarily on the excess of the purchase price over the estimated fair value of net assets
acquired, and approximately $12.2 million of the purchase price has been assigned to identifiable intangible assets of contractual customer relationships. The contractual customer relationships
are being amortized on an accelerated basis over their estimated remaining life of 14 years.

The
following unaudited proforma combined condensed statements of operations (in thousands, except per share) set forth the consolidated results of operations of the Company for the
twelve months ended December 29, 2007 and December 30, 2006 as if the acquisitions of Zen and LOGTEC had occurred at the beginning of each period presented. This unaudited proforma
information does not purport to be indicative of the actual results that would actually have occurred if the combinations had been in effect for the twelve months ended December 29, 2007 and
December 30, 2006.

Twelve Months EndedDecember 29,
2007

December 30,
2006Revenue

$
538,256

$
523,356Net income

$
20,087

$
26,536Diluted earnings per share

$
1.51

$
2.06


The
operations of SEI, Zen, and LOGTEC have been included in the Company's statements of operations since the respective dates of acquisition.

4. Accounts receivable:

Accounts receivable consists of the following (in thousands):

December 29,
2007

December 30,
2006Billed accounts receivable

$
52,814

$
46,540Unbilled accounts receivable:Currently billable


58,700


41,192Unbilled retainages and milestones payments expected to be billed within the next 12 months


5,837


5,609Indirect costs incurred and charged to cost-plus contracts in excess of provisional billing rates (see Note 9)


1,030


136Total unbilled accounts receivable


65,567


46,937Allowance for doubtful accounts


(1,283
)

(1,505
)Accounts receivable, net

$
117,098

$
91,972


The
currently billable amounts included as unbilled accounts receivable as of December 29, 2007 and December 30, 2006 represent amounts which are billed during the first
quarter of the subsequent year. They are billings for services rendered prior to year-end, which are billed once necessary billing data has been collected and an invoice produced.

F-20

---



SI International, Inc.

Notes to Consolidated Financial Statements (Continued)

5. Property and equipment:

Property and equipment consist of the following (in thousands):

December 29,
2007

December 30,
2006Computers and equipment

$
12,338

$
11,899Software


4,628


2,972Furniture and fixtures


6,382


5,072Leasehold improvements


7,016


4,25730,364


24,200LessAccumulated depreciation and amortization


(15,284
)

(11,828
)Property and equipment, net

$
15,080

$
12,372


Property
and equipment includes assets financed under capital lease obligations of approximately $221,000 and $341,000, net of accumulated depreciation, as of December 29, 2007
and December 30, 2006, respectively. The increase in the value of Property and Equipment is primarily related to the furnishings in our new Colorado Springs facility.

6. Accrued expenses and other current liabilities:

Accrued expenses and other current liabilities consist of the following (in thousands):

December 29,
2007

December 30,
2006Accrued vacation

$
7,740

$
7,068Accrued compensation


11,412


8,169Accrued insurance


1,944


3,059Accrued subcontractor costs


5,947


805Fair value of interest rate swap


1,799


Accrued bonus


10


4,413Deferred revenue


2,338


1,081Other accrued liabilities


3,982


3,952Accrued expenses and other current liabilities

$
35,172

$
28,547


7. Income taxes:

The Company accounts for income taxes in accordance with SFAS No. 109,Accounting for Income Taxes, which
requires recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements or income tax returns. Under this
method, deferred tax assets and liabilities are determined based on the differences between the financial statement and the tax basis of assets and liabilities using enacted tax rates for the year in
which the differences are expected to reverse.

F-21

---



SI International, Inc.

Notes to Consolidated Financial Statements (Continued)

7. Income taxes: (Continued)

The
tax effect of significant temporary differences, which comprise the deferred tax assets and liabilities, are as follows (in thousands):

December 29,
2007

December 30,
2006Deferred tax assets (liabilities):Accounts payable and accrued expenses

$
2,452

$
1,981Allowance for doubtful accounts


133


156Net operating loss





222Deferred rent


877


873Lease payable


513


Deferred compensation


2,064


1,565Interest rate swap agreement


702


Stock compensation


811


529Deferred revenue


693


770Total deferred tax asset


8,245


6,096Prepaid expenses


(155
)

(32
)Intangible assets


(15,615
)

(11,372
)Unbilled revenue


(1,138
)

(810
)Depreciation and amortization


(502
)

(473
)Deferred Costs


(2,569
)

(832
)Other





(130
)Total deferred tax liability


(19,979
)

(13,649
)Net deferred tax liability

$
(11,734
)
$
(7,553
)


The
provision for income taxes consists of the following (in thousands):

Fiscal year2007

2006

2005Current provision:Federal

$
6,228

$
8,587

$
7,100State


1,225


1,612


1,349Deferred provision:Federal


4,480


2,228


2,269State


512


417


224Provision for income taxes

$
12,445

$
12,844

$
10,942


F-22

---



SI International, Inc.

Notes to Consolidated Financial Statements (Continued)

7. Income taxes: (Continued)

A
reconciliation of income taxes at the Federal statutory income tax rate to the provision for income taxes is as follows (in thousands):

2007

2006

2005Income taxes at the Federal statutory income tax rate

$
11,108

$
11,549

$
9,757State income taxes, net of Federal benefit


1,291


1,317


1,090Other, net


46


(22
)

95Provision for income taxes

$
12,445

$
12,844

$
10,942


8. Debt:

Debt consists of the following (in thousands):

December 29,
2007

December 30,
2006Credit facilities:Line of credit bears interest at LIBOR plus 200 to 275 basis points or a specified base rate plus 100 to 175 basis points (exact rate based upon the Company's leverage ratio), interest due monthly, principal due
February 9, 2010

$
20,000

$
Term loan, pursuant to the Second Amendment, as of December 29, 2007 bears interest at LIBOR plus 200 basis points or a specified base rate plus 100 basis points, with twelve consecutive quarterly principal and
interest payments of $250,904 starting on December 29, 2007, with the unpaid principal and interest of approximately $91.3 million due on February 9, 2011


94,265


70,206Total debt

$
114,265

$
70,206


Since
2002, the Company has maintained a credit facility with Wachovia Bank, National Association ("Wachovia Bank") acting as Administration Agent for a consortium of lenders. The credit
facility has been amended from time to time since 2002. The credit facility is secured by a pledge of substantially all of our current and future tangible and intangible assets, as well as those of
our current and future subsidiaries, including accounts receivable, inventory and capital stock. On February 9, 2005, we entered into our Amended and Restated Credit Agreement ("Amended Credit
Agreement"), which was subsequently amended by a First Amendment dated February 27, 2006 and the Second Amendment to the Amended and Restated Credit Agreement dated June 8, 2007,
contemporaneously with the closing of the LOGTEC acquisition. After the LOGTEC acquisition, the Amended Credit Agreement had outstanding term debt of approximately $95 million. Additionally,
the Company borrowed approximately $25 million under the revolving credit facility.

The
Company may repay either or both of the term loan facility and the revolving credit facility in whole or in part at anytime prior to their respective maturity dates. As we have the
intent to repay the

F-23

---



SI International, Inc.

Notes to Consolidated Financial Statements (Continued)

8. Debt: (Continued)

balance
on the revolving credit facility within the next twelve months, the outstanding balance has been classified as a current liability.

As
with the previous credit facilities, we are required to maintain compliance with financial and non-financial covenants including, maintaining certain leverage and fixed
charge ratios, as well as certain annual limits on our capital expenditures. These ratios will be calculated in accordance with the definitions and terms contained in the documents governing the
credit facility, which may be different than calculations pursuant to GAAP. At December 29, 2007, the Company was in compliance with its debt covenants.

In
connection with the execution of the Amended Credit Agreement on February 9, 2005, the Company incurred approximately $3.2 million financing costs. With respect to the
First Amendment, the Company incurred approximately $0.6 million in financing costs. With respect to the Second Amendment, the Company incurred approximately $0.1 million in financing
costs. Such costs associated with the credit facility were capitalized as deferred financing costs on the balance sheet and amortized over the six year term of the Amended Credit Agreement. Such costs
associated with the First Amendment and Second Amendment were being amortized over the remaining term of the Amended Credit Agreement.

During
the fiscal year ended December 29, 2007, the Company made regular quarterly payments totaling $0.9 million of outstanding term debt, after which the remaining
principal balance as of December 29, 2007 was approximately $94.3 million. The Company's quarterly payment obligation is $250,904 for twelve consecutive quarters starting from
December 29, 2007 through December 30, 2010, with a final payment of approximately $91.3 million on February 9, 2011.

The
annual maturities of long-term debt and the line of credit as of December 29, 2007 are as follows (in thousands):

Fiscal year

Maturity2008

$
1,0042009


1,0042010


21,0042011


91,253Thereafter


Total long-term debt


114,265


The
Company also had a note payable outstanding related to the acquisition of Zen with a face value of $6.0 million including imputed interest as of December 30, 2006 that
was paid in May 2007.

In
August 2007, the Company entered into a forward interest rate swap agreement under which it exchanged floating-rate interest payments for fixed-rate interest
payments. The agreement, covering a combined notional amount of debt totaling $30 million, as of December 29, 2007, provides for swap payments over a thirty-six month period,
and are settled on a quarterly basis. The weighted-average fixed interest rate provided by the agreement is 5.045 percent.

F-24

---



SI International, Inc.

Notes to Consolidated Financial Statements (Continued)

8. Debt: (Continued)

The
Company accounts for this interest rate swap agreement under the provisions of SFAS No. 133, and has determined that the swap agreement qualifies as an effective hedge.
Accordingly, the fair value of the interest rate swap agreement at December 29, 2007 of $1.8 million has been reported in accrued liabilities with an offset, net of an income tax effect,
included in accumulated other comprehensive loss in the accompanying consolidated balance sheets.

9. Commitments and contingencies:

Leases

As of December 29, 2007, the Company has noncancelable operating leases, primarily for real estate, that expire over the next ten years. Rental expense
during fiscal years 2007, 2006 and 2005 was approximately $9.5 million, $9.4 million and $8.1 million, respectively.

Future
minimum lease payments under noncancelable operating and capital leases as of December 29, 2007 are as follows (in thousands):

Fiscal year

Capital

Operating2008

$
129

$
10,1362009


79


9,9162010


67


9,4082011


16


7,8632012





6,940Thereafter





13,701Total minimum lease payments


291

$
57,964Lessinterest element of payment


(31
)Present value of future minimum lease payments


260Current portion


108Long-term capital lease

$
152


Subsequent
to the purchase of LOGTEC, the Company assumed certain capital and operating leases held at the time of purchase.

Contract cost audits

Payments to the Company on government cost reimbursable contracts are based on provisional, or estimated indirect rates, which are subject to audit on an annual
basis by the Defense Contract Audit Agency (DCAA). The cost audits result in the negotiation and determination of the final indirect cost rates that the Company may use for the period(s) audited. The
final rates, if different from the provisional rates, may create an additional receivable or liability for the Company. The Company's revenue recognition policy calls for revenue recognized on all
cost reimbursable government contracts to be recorded at actual rates unless collectibility is not reasonably assured. To the extent the indirect rate differential creates a liability for the Company,
the differential is recognized as a reduction to revenue when identified.

F-25

---



SI International, Inc.

Notes to Consolidated Financial Statements (Continued)

9. Commitments and contingencies: (Continued)

Litigation and claims

We are a party to litigation and legal proceedings that we believe to be a part of the ordinary course of our business. While we cannot predict the ultimate
outcome of these matters, we currently believe that any ultimate liability arising out of these proceedings will not have a material adverse effect on our financial position. We may become involved in
other legal and governmental, administrative or contractual proceedings in the future.

The
SEI acquisition agreement provides for a purchase price adjustment based upon the working capital of SEI as of the closing date. Subsequent to the closing date, we received a payment
of $1.6 million in connection with services performed prior to the closing date that SEI had not previously billed, and was not authorized to bill, its customer as of the closing date. The SEI
selling stockholders have asserted that they are entitled to a credit in connection with the calculation of working capital adjustment in an amount equal to the amount received by us for this
post-closing payment. We believe that, in accordance with GAAP, the SEI selling stockholders should not receive the benefit of the post-closing payment. In accordance with the
terms of the SEI acquisition agreement, the parties have jointly submitted the issue to an independent accounting firm for resolution. We anticipate that this matter will be resolved before the end of
2008.

10. Stockholders' equity:

Common stock

On April 7, 2006, we issued 1,200,000 shares of common stock in an underwritten public offering at an initial price to the public of $34.00 per share under
our shelf registration statement on Form S-3 (No. 333-113827) declared effective by the SEC on May 21, 2004. Net sale proceeds to the Company, after
deducting underwriting discounts and commissions, but before other expenses relating to the sale, totaled approximately $40.3 million. The Company used the net
proceeds from the sale together with cash on hand to pay down outstanding term debt under the First Amendment.

Stock incentive plans

In 2002, the Company adopted the 2002 Stock Incentive Plan, or the Plan, to grant stock options to purchase shares of its common stock to its employees and
employees of its affiliates. In March 2005, the Board of Directors increased the number of reserved shares by an additional 160,000 to a total number of 1,920,000 reserved shares. Further, in March
2005, the Board of Directors authorized the acceleration of vesting of certain stock awards under the Plan upon the occurrence of certain change of control events. With this change, future stock
awards may include provisions for acceleration of vesting upon the occurrence of certain change of control events. The Board of Directors also authorized the amendment of certain prior stock option
awards issued under the Plan such that the exercise price of each such award was greater than or equal to the closing market price of our common stock on NASDAQ as of March 11, 2005. With
respect to such designated prior stock option awards, the Board of Directors authorized an amendment to the stock option award to provide for the acceleration of vesting upon the occurrence of certain
change of control events.

In
April 2005, the Board of Directors voted to adopt the 2002 Amended and Restated Omnibus Stock Incentive Plan (the "Amended and Restated Plan") and the Amended and Restated Plan was
approved by our stockholders at the annual meeting of stockholders held in June 2005. The Amended

F-26

---



SI International, Inc.

Notes to Consolidated Financial Statements (Continued)

10. Stockholders' equity: (Continued)

and
Restated Plan amends and restates the Plan by (i) increasing the number of shares of common stock reserved and available under the Plan by 1,000,000 shares to a total share allocation of
2,920,000, (ii) permitting the grant of deferred shares, performance shares and performance units, (iii) prohibiting repricing of options without prior stockholder approval,
(iv) limiting the number of shares of common stock and performance units a participant may receive in any calendar year to 300,000 and 500,000, respectively, and adding other administrative
provisions to comply with the performance-based compensation exception to the deduction limit of Section 162(m) of the Internal Revenue Code of 1986, as amended; (v) eliminating the
provision that previously provided for an automatic increase in the number of shares reserved for issuance under the Amended and Restated Plan each fiscal year by a number equal to the lesser of
160,000 shares and an amount determined by the Board of Directors, (vi) providing that non-qualified stock option grants will be priced at one hundred percent (100%) of fair market
value; (vii) providing for minimum vesting periods of stock bonus awards, restricted common stock awards, stock appreciation rights, deferred shares, and other stock awards subject to the
possible acceleration of the vesting schedule at the discretion of the administrator; (viii) providing that future amendments to the Amended and Restated Plan that increase the number of shares
allocated, modify participation requirements, or materially increase benefits accruing to the participants under the Plan will be subject to stockholder approval; and (ix) making other
technical changes to the Plan.

On
December 13, 2005, the Board of Directors approved the accelerated vesting of unvested stock options previously awarded to employees, officers and directors as of
December 7, 2005 in light of new accounting regulations that were to come into effect January 1, 2006. Based on SFAS No. 123R, the Board took the action to accelerate the unvested
stock options with the belief that it was in the best interest of stockholders, as it reduced the Company's reported compensation expense in future periods. The acceleration generated compensation
expense of approximately $0.4 million determined under the intrinsic value method.

F-27

---



SI International, Inc.

Notes to Consolidated Financial Statements (Continued)

10. Stockholders' equity: (Continued)

The
Company's option activity and price information for the three-year period ended December 29, 2007 is as follows:

Options

Shares
exercisable

Weighted-average
exercise priceBalance, December 25, 2004

1,405,257



$
14.93Options exercisable at December 25, 2004



546,646


13.402005 grants

687,097




28.192005 exercises

(293,689
)



(12.73
)2005 forfeitures

(47,728
)



(18.00
)Balance, December 31, 2005

1,750,937



$
20.29Options exercisable at December 31, 2005



1,750,937


20.292006 grants

171,025




29.252006 exercises

(425,530
)



(17.33
)2006 forfeitures

(1,876
)



(27.76
)Balance, December 30, 2006

1,494,556



$
22.33Options exercisable at December 30, 2006



1,302,055


21.462007 grants

132,400




28.422007 exercises

(112,724
)



(17.67
)2007 forfeitures

(23,071
)



(27.71
)Balance, December 29, 2007

1,491,161



$
23.00Options exercisable at December 29, 2007



1,233,331


21.79


The
following table shows the number of options outstanding, the weighted average exercise price, the weighted average remaining life, and the options exercisable for each range of
exercise prices of options outstanding at December 29, 2007.

Range of
Exercise Price

Number of
Options
Outstanding

Weighted
Avg. Exercise
Price

Weighted
Average
Remaining Life

Options
Exercisable

Weighted
Avg. Exercise
Price$    1.58-      9.27

21,434

$
8.69

3.5

21,434

$
8.69$  10.81-    14.00

334,382

$
13.79

3.9

334,382

$
13.79$  16.40-    19.26

261,468

$
16.49

6.0

261,468

$
16.49$  20.55-    26.60

154,720

$
25.97

7.1

150,620

$
25.95$  26.80-    29.87

523,824

$
28.30

8.0

302,024

$
28.21$  30.36-    33.01

194,820

$
31.07

8.0

162,890

$
30.99$556.25-$556.26

513

$
556.26

0.1

513

$
556.26Total

1,491,161

$
23.00

6.8

1,233,331

$
21.79


Each
stock option grant establishes the vesting schedule applicable to the grant. The weighted-average remaining contractual life of the stock options outstanding and exercisable as of
December 29, 2007 was 6.3 years with the maximum contractual term of 10 years. The weighted-average remaining contractual life of the stock options outstanding and exercisable as
of December 30, 2006 was 7.2 years.

F-28

---



SI International, Inc.

Notes to Consolidated Financial Statements (Continued)

10. Stockholders' equity: (Continued)

The
weighted-average grant-date fair value of options granted during the fiscal years ended December 29, 2007, December 30, 2006 and December 31, 2005
was $11.27, $12.75 and $14.50 respectively. The total intrinsic value of options exercised during the fiscal years ended December 29, 2007, December 30, 2006 and December 31, 2005
was $1.4 million, $6.4 million and $4.9 million, respectively. The total intrinsic value was $8.1 million for both options outstanding and options exercisable as of
December 29, 2007.

Prior
to fiscal 2006, the Company's stock incentive plan consisted principally of stock options. During fiscal 2006, the Company revised its stock incentive arrangement to provide
restricted stock awards to directors and employees.

A
summary of non-vested stock options and restricted awards under the plan as of December 29, 2007, is presented below:

|                                                   |  | Stock options |   | Weighted
average
fair value |       | Restricted
awards |        | Weighted
average
fair value
|-------------------------------------------------- |  | ------------- | - | --------------------------- | ----- | ----------------- | ------ | ---------------------------
|Non-vested shares outstanding at December 30, 2006 |  | 166,250       |   | $                           | 12.75 |                   | 32,200 |                            
|Granted                                            |  | 132,400       |   |                             | 11.27 |                   | 75,200 |                            
|Vested                                             |  | (35,805       | ) |                             | 12.71 |                   | (7,063 | )                          
|Forfeited                                          |  | (5,015        | ) |                             | 12.24 |                   | (1,465 | )                          
|                                                   |  |               |   |                             |       |                   |        |                            
|Non-vested shares outstanding at December 29, 2007 |  | 257,830       |   | $                           | 11.97 |                   | 98,872 |                            
|                                                   |  |               |   |                             |       |                   |        |                            

During
its fiscal year ended 2001 and continuing into the fiscal year ended 2002, the Company issued options with exercise prices which were less than the fair value of SI
International's common stock at the date of option grant. Total deferred compensation related to these option grants was $518,000 for the fiscal year ended December 28, 2002 and $142,000 for
the fiscal year ended December 29, 2001. This deferred compensation was amortized over the vesting period of the related options. Such non-cash stock-based compensation expense
totaled $196,000 in fiscal year 2005 which amounted to the remaining compensation expense to be recognized for these option grants.

Stock repurchase program

During the Company's Board of Directors meeting on December 6, 2005, the Board authorized the repurchase of up to 300,000 shares of its common stock up to
an aggregate maximum dollar amount of $8 million. The Company has approximately 13.1 million shares outstanding as of December 29, 2007. Timing and volume of any purchases will be
guided by management's assessment of market conditions, securities law limitations, the number of shares of common stock outstanding, and alternative, potentially higher value uses for cash resources.
The repurchase plan may be suspended or discontinued at any time without prior notice.

11. Retirement plans:

SI International has a defined contribution 401(k) Retirement/Savings Plan (the Plan) to provide retirement benefits for all eligible employees of the Company.
Employees are eligible to participate in the Plan beginning on the first of the month following the start of employment and attainment of age 21. Under the Plan, eligible employees may contribute from
1% to 15% of pre-tax compensation. The

F-29

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SI International, Inc.

Notes to Consolidated Financial Statements (Continued)

11. Retirement plans: (Continued)

Plan
also allows for after-tax contribution up to 5% of compensation. The Company makes an annual matching contribution and, at its discretion, may make an annual profit-sharing
contribution. For fiscal years 2007 and 2006, there was no profit-sharing contribution made to the Plan by the Company. A profit-sharing contribution of $1.0 million was made by the Company for
fiscal year 2005. The Company's matching contribution to the Plan for fiscal years 2007, 2006 and 2005 was approximately $2.6 million, $2.1 million, and $1.8 million,
respectively.

Nonqualified Deferred Compensation Plan

The SI International Nonqualified Deferred Compensation Plan (the "Plan") provides a select group of management, members of the Board of Directors or highly
compensated employees ("Eligible Employees") of the Company with the opportunity to defer the receipt of certain pre-tax
cash compensation up to 50 percent of their base compensation, and up to 100 percent of their bonus and commissions. The Company may make a discretionary contribution in any amount on
behalf of one or more Participants at the end of each fiscal year. Company contributions vest after 3 years, and vesting is accelerated in the event of a change of control of the Company.
Participant deferrals and Company contributions will be credited with the rate of return based on the investment options and asset allocations selected by the Participant. Participants may change
their asset allocation as often as daily, if they so chose. A rabbi trust has been established to hold and provide a measure of security for the investments that finance benefit payments.
Distributions from the Plan are made upon retirement, termination, death, or total disability.

The
Plan obligations due to participants totaled $5.3 million at December 29, 2007, which is included in other long-term liabilities in the accompanying
consolidated balance sheet.

The
Company maintains investment assets in a rabbi trust to offset the obligations under the Plan. The value of the investments in the rabbi trust was $4.7 million at
December 29, 2007. Investment losses were $0.1 million for the year ended December 29, 2007.

12. Interim financial data (unaudited)

|                             |  | Fiscal Year 2007 |         | Fiscal Year 2006
|---------------------------- |  | ---------------- | ------- | ----------------
|
|
|Revenue                      |  | $                | 113,700 |                 
|Income from operations       |  | $                | 9,127   |                 
|Net income                   |  | $                | 4,734   |                 
|Basic net income per share   |  | $                | 0.36    |                 
|Diluted net income per share |  | $                | 0.36    |                 

13. Subsequent Event (unaudited)

On February 13, 2008, we entered into a Second Amended and Restated Credit Agreement (the "Second Amended Credit Agreement"). The amended and restated
credit facility consists of a revolving line of credit of up to $140.0 million and a term loan of $60.0 million. As of February 13, 2008, we had $60.0 million in term debt
and approximately $56.7 million of revolving credit debt outstanding. The Second Amended Credit Agreement also amended debt covenant thresholds and

F-30

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SI International, Inc.

Notes to Consolidated Financial Statements (Continued)

13. Subsequent Event (unaudited) (Continued)

lowered
the variable rate margins that are be to be applied to LIBOR or an alternative base rate in determining the periodic interest rate.

At
the time the Company borrows funds from either of the loan facilities under the Second Amended Credit Agreement, it may choose from two interest rate options. The Company may elect to
have the borrowings bear interest at floating rates equal to LIBOR plus a spread ranging from 87.5 to 150 basis points or an alternative base rate plus a spread ranging from zero to 50 basis points.
Under either the LIBOR or an alternative base rate option, the exact interest rate spread will be determined based upon the Company's leverage ratio as defined in the Second Amended Credit Agreement.

The
term loan facility requires final payment in full on the term loan maturity date of February 13, 2013. The outstanding balance under the revolving line of credit facility will
accrue interest at a variable rate, with interest only payments being required until the facility matures on February 13, 2013. We may repay either or both of the term loan facility and the
revolving loan facility in whole or in part at anytime prior to their respective maturity dates.

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SI International, Inc. and Subsidiaries  (See Note 1 to Consolidated Financial Statements)  Schedule IIValuation and Qualifying Accounts  (In Thousands)

|Description                                 |                                 | Balance at
beginning of
period |       | Charged to
costs and
expenses |    | Acquired in
business
combinations |       | Deductions |     | Balance at
end of
period
|------------------------------------------- | ------------------------------- | ------------------------------ | ----- | ----------------------------- | -- | --------------------------------- | ----- | ---------- | --- | ------------------------
|For the fiscal year ended December 31, 2005 |                                 |                                |       |                               |    |                                   |       |            |     |                         
|                                            | Deducted from assets accounts:  |                                |       |                               |    |                                   |       |            |     |                         
|                                            | Allowance for doubtful accounts |                                | 1,144 |                               | 52 |                                   | 1,106 |            | 793 |                         
|For the fiscal year ended December 30, 2006 |                                 |                                |       |                               |    |                                   |       |            |     |                         
|                                            | Deducted from assets accounts:  |                                |       |                               |    |                                   |       |            |     |                         
|                                            | Allowance for doubtful accounts |                                | 1,509 |                               |   |                                   |      |            | 4   |                         
|For the fiscal year ended December 29, 2007 |                                 |                                |       |                               |    |                                   |       |            |     |                         
|                                            | Deducted from assets accounts:  |                                |       |                               |    |                                   |       |            |     |                         
|                                            | Allowance for doubtful accounts |                                | 1,505 |                               |   |                                   |      |            | 222 |                         

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