Document:

<PAGE>   1
                                                                   EXHIBIT 10.18

                              EMPLOYMENT AGREEMENT

        THIS EMPLOYMENT AGREEMENT (this "Agreement") is made effective for all
purposes and in all respects as of the 1st day of April, 2000, by and between
(a) BTG, INC., a Virginia corporation, (hereinafter referred to as "Employer"),
and (b) Leslie A. Rose, Senior Vice President (hereinafter referred to as
"Employee").

        WHEREAS, Employer desires to continue to employ Employee in the capacity
of a Senior Vice President;

        WHEREAS, Employee desires to continue to be employed by Employer in the
aforesaid capacity; and

        WHEREAS, Employer and Employee desire to enter into this Agreement to
set forth the terms and conditions of Employee's continued employment with
Employer during the term hereof.

        NOW, THEREFORE, in consideration of the foregoing, of the mutual
promises herein contained, and of other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the parties hereto,
intending legally to be bound, hereby agree as follows:

        1.      Term. The term of employment under this Agreement (the "Term")
shall be for the period commencing on the effective date hereof and ending on
March 31, 2004.

        2.      Duties of Employee. Subject to the provisions of this Agreement,
during the Term, Employer shall employ Employee and Employee shall serve
Employer as a Senior Vice President. During the Term, Employee shall discharge
the obligations and responsibilities normally associated with such office and
shall perform such other duties and responsibilities as the Board of Directors
of Employer (the "Board") shall determine from time to time that are consistent
with Employee's position and the terms of this Agreement.

        3.      Compensation. Employee will receive an annual base salary of not
less than the salary specified on Exhibit A hereto ("Base Salary"). Base Salary
and merit increases to such Base Salary will be payable at the times and in the
manner consistent with Employer's general policies regarding compensation of
executive employees. In the event that Employee shall be given significant new
or additional responsibilities (without a corresponding decrease in existing
responsibilities) at any time during the Term, Employer and Employee agree to
discuss the amount, if any, of increase in Employee's Base Salary. Employee will
be eligible to receive annual incentive compensation based on incentive target
percentages of base salary comparable to such percentages in effect immediately
prior to the effective date of the Agreement. Nothing in this Section will
guarantee to Employee any specific amount of incentive compensation, or prevent
the Board from establishing new performance goals and compensation targets
applicable to Employee.

<PAGE>   2

        4.      Additional Benefits. In addition to the compensation referred to
in Section 3 hereof, Employee shall be entitled to receive such health, medical,
disability, dependent health care, life, retirement and other employee benefits
as Employer generally makes available to its executive officers.

        5.      Termination

                A.      Termination Without Cause. Either Employee or Employer
may terminate this Agreement and Employee's employment hereunder at any time
without cause by giving not less than thirty (30) days advanced written notice
to the other party.

                B.      Termination for Cause. Employer may terminate this
Agreement and Employee's employment hereunder for Cause (as hereinafter defined)
by giving written notice of such termination to Employee. For purposes of this
Agreement, "Cause" shall mean: Employee's willful and gross misconduct which
has, or could reasonably be expected to have, a material adverse effect on the
business, assets, operations, results of operations or financial condition of
Employer. If Employer shall elect to terminate this Agreement and Employee's
employment hereunder for Cause, Employer shall provide written notice thereof to
Employee within sixty (60) days after the occurrence of the event upon which
such right of termination for Cause arises. A termination for Cause pursuant
hereto shall take effect ten days after the delivery of such written notice to
Employee unless Employee shall, during such ten day period, remedy the Cause
specified in such notice; provided however, that such termination shall take
effect immediately upon the giving of such notice if the Board of Directors
specifically determines in good faith that such Cause is unremediable.

                C.      Death and Disability. This Agreement and Employee's
employment hereunder shall automatically terminate upon the death of Employee,
and also may be terminated by Employer by giving written notice of such
termination to Employee if Employee shall be rendered incapable by illness or
any physical or mental disability from substantially complying with the terms,
conditions and provisions on his part to be observed and performed for a period
in excess of six (6) consecutive months during the Term.

                D.      Termination for Good Reason. At any time within two (2)
years following a Change in Control (as hereinafter defined), Employee may
terminate this Agreement and Employee's employment hereunder for Good Reason (as
hereinafter defined) by giving written notice of such termination to Employer.
For purposes of this Agreement, "Good Reason" shall mean any of the following:
(a) the Employer changes the authority provided currently to Employee, changes
the duties and responsibilities currently held by Employee, or requests that the
Employee provide services that are not of a similar character to those provided
by the Employee to the Employer immediately prior to the Change in Control; (b)
the Employer has breached any material provision of this Agreement and within 30
days after notice thereof from the Employee, the Employer fails to cure such
breach; or (c) the Employer requires the Employee to relocate his principal
place of employment to any location outside a twenty-five mile radius from the
location of the Employee's principal place of employment immediately prior

                                       2
<PAGE>   3

to the date of the Change in Control. If Employee shall elect to terminate this
Agreement and Employee's employment hereunder for Good Reason, Employee shall
provide written notice thereof to Employer within sixty (60) days after the
occurrence of the event upon which such right of termination for Good Reason
arises. A termination for Good Reason pursuant hereto shall take effect ten days
after the delivery of such written notice to Employer unless Employer shall,
during such ten day period, remedy the Good Reason specified in such notice.

                        A "Change in Control" for purposes of this Agreement
shall mean (a) the sale of substantially all of Employer's assets to a single
purchaser or group of associated purchasers; (b) the sale, exchange, or other
disposition, in one transaction or a series of related transactions, of the
majority of Employer's outstanding corporate shares; or (c) the merger or
consolidation of Employer with another unrelated company where Employer is not
the surviving entity in such merger or consolidation. As used in this Agreement,
"Employer" shall mean Employer as herein before defined and any successor to its
business and/or assets in a Change in Control transaction.

        6.      Termination Payments and Benefits.

                A.      Termination Upon Change in Control. If during the Term
there shall occur a Change in Control (as hereinafter defined), and within two
(2) years after such Change in Control Employer shall terminate Employee without
Cause, or Employee shall terminate employment with Employer for Good Reason
pursuant to Section 5(D) above, then Employer will pay to Employee an amount
equal to 284% of Base Salary. Any amount due pursuant to this Section will be
payable in a lump sum, less applicable taxes, within 30 days following
termination; provided, however, that the payment of any such amount shall be
conditioned upon Employee's execution of a general release of and waiver of
claims against Employer in form and substance satisfactory to Employer.

                B.      Other Events of Termination. In the event that
Employee's employment hereunder is terminated by reason of Employee's voluntary
resignation (as provided in Section 5(A)), by Employer for Cause (as provided in
Section 5(B)), or Employee's death or disability (as provided in Section 5(C)),
all accrued Base Salary shall be paid to Employee (or, in the event of
Employee's death, to Employee's estate), but no compensation (or other payments)
in excess of such accrued but unpaid Base Salary, shall then be paid or payable
to Employee (or to his estate) under this Agreement.

                C.      Excise Tax Restoration Payment. In the event that it is
determined that any payment or distribution of any type to or for the benefit of
Employee made by Employer, by any of its affiliates, by any person who acquires
ownership or effective control or ownership of a substantial portion of
Employer's assets (within the meaning of section 280C of the Internal Revenue
Code of 1986, as amended, and the regulations thereunder (the "Code")) or by any
affiliate of such person, whether paid or payable or distributed or
distributable pursuant to the terms of an employment agreement or otherwise (the
"Total Payments"), would be subject to

                                       3
<PAGE>   4

the excise tax imposed by Section 4999 of the Code or any interest or penalties
with respect to such excise tax (such excise tax, together with any such
interest or penalties, are collectively referred to as the "Excise Tax"), then
Employee shall be entitled to receive an additional payment (an "Excise Tax
Restoration Payment") in an amount that shall fund the payment by the Employee
of any Excise Tax on the Total Payments as well as all income taxes imposed on
the Excise Tax Restoration Payment, any Excise Tax imposed on the Excise Tax
Restoration Payment and any interest or penalties imposed with respect to taxes
on the Excise Tax Restoration or any Excise Tax.

        7.      Director and Officer Liability. Employer agrees to indemnify
Employee in connection with his serving as an officer of Employer, in a manner
consistent with Employer's Articles of Incorporation, Bylaws and the practices
and policies of Employer in effect from time to time during the Term. In the
event that Employer shall enter into any indemnification agreement with any
officer of Employer or any subsidiary of Employer, Employer shall promptly
enter into an agreement containing similar provisions with respect to
indemnification with Employee.

        8.      Competition, Confidentiality, Nonsolicitation.

                A.      Covenant Not to Compete; Nonsolicitation. Employee
covenants and agrees that at all times during the period of his employment with
Employer and ending upon the earlier of (i) one (1) year after termination of
Employee's employment with Employer pursuant to which Employee is entitled to a
termination payment pursuant to Section 6(A) of this Agreement, Employee shall
not, directly in competition with the business of Employer or its affiliates:
participate in the management of any business enterprise if such enterprise
engages in substantial and direct competition with Employer (i.e. provides
services or product to the same customers as the Employer) and such enterprise's
sales of any product or service competitive with any product or service of
Employer amounted to 25% of such enterprise's net sales for its most recently
completed fiscal year and if Employer's net sales of said product or service
amounted to 25% of Employer's net sales for its most recently completed fiscal
year. Competition will not include (i) the mere ownership of securities in any
enterprise and exercise of rights appurtenant thereto or (ii) participation in
management of any enterprise or business operation thereof other than in
connection with the competitive operation of such enterprise.

                B.      Confidentiality. The parties hereto acknowledge that
Employer has and will continue to disclose to Employee its confidential or
proprietary information. Employee hereby covenants and agrees that he will not,
without the prior written consent of Employer during the Term or thereafter,
disclose to any person not employed by Employer, or use in connection with
engaging in Competition with employer, any confidential or proprietary
information of Employer. For purposes of this Agreement, the term "confidential
or proprietary information" will include all information of any nature and in
any form that is owned by Employer and that is not publicly available or
generally known to persons engaged in businesses similar or related to those of
Employer. Confidential information will include, without limitation,

                                       4
<PAGE>   5

Employer's financial matters, customers, employees, industry contacts, and all
other secrets and all other information of a confidential or proprietary nature.
Confidential information shall not include information that comes into the
possession of Employee following termination from a source not under a duty to
Employer to refrain from disclosing such information. The foregoing obligations
imposed by this Section will cease if such confidential or proprietary
information will have become, through no fault of the Employee, generally known
to the public or Employer is required by law to make disclosure (after giving
Employer notice and an opportunity to contest such requirement).

                C.      Nonsolicitation. Employee covenants and agrees that at
all times during the period of his employment with Employer and for a period of
one (1) year after termination of Employee's employment, pursuant to Section
6(A), he will not attempt to influence, persuade or induce, or assist any other
person in so persuading or inducing, any employee of Employer to give up, or to
not commence, employment or a business relationship with Employer or the
Employer, unless Employer agrees in writing.

                D.      Severability; Injunctive Relief. The covenants contained
in this Section 8 shall be construed as a series of separate and severable
covenants which are identical in terms except for geographic coverage. Employee
and Employer agree that if in any proceeding, the tribunal shall refuse to
enforce fully any covenants contained herein because such covenants cover too
extensive a geographic area or too long a period of time or for any other reason
whatsoever, any such covenant shall be deemed amended to the extent (but only to
the extent) required by law. Each party acknowledges and agrees that the
services to be rendered by Employee to Employer hereunder are of a special and
unique character. Each party shall have the right to injunctive relief, in
addition to all of its other rights and remedies at law or in equity, to enforce
the provisions of this Agreement.

                E.      The obligations of Employee under this Section 8 shall
survive the termination or expiration of the Employment Term.

        9.      Proprietary Rights.

                A.      All right, title, and interest in all copyrightable
material which Employee shall conceive or originate, either individually or
jointly with others, and which arise out of Employee's employment with Employer,
is the property of Employer and is by this Agreement assigned to Employer along
with ownership of any and all copyrights in the copyrightable material. Employee
agrees to execute all papers and perform all other acts necessary to assist
Employer to obtain and register copyrights on such materials in any and all
countries. Works of authorship created by Employee for Employer in performing
his responsibilities under this Agreement shall be considered "works made for
hire" as defined in the U.S. Copyright Act. In addition, Employee hereby assigns
to Employer all proprietary rights including, but not limited to, all patents,
copyrights, trade secrets and trademarks Employee might otherwise have, by
operation of law or otherwise, in all inventions, discoveries, works, ideas,
information, knowledge and data related to Employee's access to confidential
information of Employer.

                                       5
<PAGE>   6

                B.      All know-how and trade secret information conceived or
originated by Employee which arises out of Employee's employment with Employer
shall be the property of Employer, and all rights therein are by this Agreement
assigned to Employer.

                C.      If Employee is engaged in or associated with the
planning or implementing of any project, program or venture involving Employer
and a third party or parties all rights in such project, program or venture
shall belong to Employer. Except as formally approved by Employer's Board of
Directors, Employee shall not be entitled to any interest in such project,
program or venture or to any commission, finder's fee or other compensation in
connection therewith other than the compensation to be paid to Employee as
provided in this Agreement.

                D.      Upon termination of his employment with Employer,
Employee shall deliver promptly to Employer all records, manuals, books, blank
forms, documents, letters, memoranda, notes, notebooks, reports, data, tables,
calculations, customer and prospective customer lists, and copies of all of the
foregoing, which are the property of Employer, and all other property, trade
secrets and confidential information of Employer, including, but not limited to,
all documents which in whole or in part contain any trade secrets or
confidential information of Employer, which in any of these cases are in his
possession or under his control.

                E.      Employee further agrees to execute and deliver any
additional documents, instruments, applications, affidavits or other writings
reasonably necessary to further evidence the assignments described in this
Section 9.

        10.     Tax Withholding. Payments to Employee of all compensation
contemplated under this Agreement shall be subject to all applicable legal
requirements with respect to the withholding of taxes or other amounts required
by law or regulation.

        11.     Amendment; Waiver. This Agreement may not be modified, amended
or waived in any manner except by an instrument in writing signed by the parties
hereto. The waiver by either party of compliance with any provision of this
Agreement by the other party shall not operate or be construed as a wavier of
any provision of this Agreement, or of any subsequent breach by such party of a
provision of this Agreement.

        12.     Governing Law. In view of the fact that the principal office of
Employer is located in the Commonwealth of Virginia, it is understood and agreed
that the construction and interpretation of this Agreement shall at all times
and in all respects be governed by the substantive laws of the Commonwealth of
Virginia without regard to its rules regarding conflicts of laws.

        13.     Submission to Jurisdiction. Employee hereby irrevocably submits
to the exclusive jurisdiction of any Virginia court or Federal court sitting in
Fairfax County, Virginia, in any action or proceeding arising out of or relating
to this Agreement or the transactions contemplated hereby, and Employee hereby
irrevocably agrees that all claims in respect of any such action or proceeding
may be heard and determined in any such Virginia or Federal court.

                                       6
<PAGE>   7

Employee irrevocably consents to the service of any and all process in any such
action or proceeding by the mailing of copies of such process to Employee at its
address specified pursuant to Section 15. Employee irrevocably confirms that
service of process out of such courts in such manner shall be deemed due service
upon him for the purposes of such action or proceeding. Employee and Employer
hereby irrevocably waive (a) any objection such party may have to the laying of
venue of any such action or proceeding in any of such courts, or (b) any claim
that such party may have that any such action or proceeding has been brought in
an inconvenient forum. Employee and Employer irrevocably agree that a final
judgment in any such action or proceeding shall be conclusive and may be
enforced in other jurisdictions by suit on the judgment or in any other manner
provided by law. Nothing in this Section 13 shall affect the right of any party
hereto to serve legal process in any manner permitted by law.

        14.     Severability. The provisions of this Agreement (including
particularly, but not limited to, the provisions of Section 8 hereof) shall be
deemed severable, and the invalidity or unenforceability of any one or more of
the provisions hereof shall not affect the validity and enforceability of the
other provisions hereof.

        15.     Notices. Any notice required to be given hereunder shall be
sufficient if in writing, and sent by courier service (with proof of service),
facsimile transmission followed by a mailed hard copy, hand delivery or
certified or registered mail (return receipt requested and first-class postage
prepaid), to his residence in the case of Employee, and to its principal office
in the case of Employer.

        16.     Entire Agreement. This Agreement contains the entire agreement
and understanding by and between Employer and Employee with respect to the
employment herein referred to, and no representations, promises, agreements or
understandings, written or oral, not contained herein shall be of any force or
effect.

        17.     Successors; Binding Agreement.

                A.      Employer will require any successor of Employer in a
Change in Control transaction to expressly assume and agree to perform this
Agreement in the same manner and to the same extent that Employer would be
required to perform it if no such Change in Control transaction had taken place.
Failure of Employer to obtain such assumption and agreement prior to the
effectiveness of any such Change in Control transaction shall be a breach of
this Agreement and shall entitle Employee to compensation from Employer in the
same amount and on the same terms as he would be entitled to hereunder if
Employee terminated his employment for Good Reason pursuant to Section 5(D)
above, except that for purposes of implementing the foregoing, the date on which
any such Change in Control transaction becomes effective shall be deemed the
date of termination hereunder.

                B.      This Agreement shall be binding upon and shall inure to
the benefit of the parties hereto and their respective heirs, devisees,
executors, administrators, legal representatives, successors and assigns.

                                       7
<PAGE>   8

        18.     Counterparts. This Agreement may be executed in one or more
counterparts, each of which shall be deemed an original hereof, and all of which
together shall constitute one and the same instrument.

        IN WITNESS WHEREOF, Employer and Employee have duly executed this
Agreement under seal as of the day and year first above written.

                                        BTG, INC.

                                        By:      /s/ Edward H. Bersoff
                                               -----------------------------
                                               Edward H. Bersoff,
                                               President, CEO

                                        EMPLOYEE

                                        By:      /s/ Leslie A. Rose
                                               -----------------------------
                                               Leslie A. Rose,
                                               Senior Vice President

                                      8

<PAGE>   9

                                   Exhibit A

                                 Leslie A. Rose
                             Senior Vice President
                                  $180,000.00<PAGE>   1
                                                                  EXHIBIT 10.19

                           STOCK PURCHASE AGREEMENT

                                 BY AND AMONG

                                  BTG, INC.,
                            A VIRGINIA CORPORATION,

                            RESEARCH PLANNING, INC.
                            A DELAWARE CORPORATION,

                           REYNALDO P. MADURO, SR.,

                             CHARLES H. LYON, III

                                      AND

                               GRANT C. PETERSON

                                MARCH 30, 2001
<PAGE>   2

                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                      Page
                                                                                      ----
<S>                                                                                    <C>
1.  DEFINITIONS ........................................................................1
2.  SALE AND PURCHASE OF SHARES ........................................................1
    2.01  Sale and Purchase of Shares ..................................................1
    2.02  Purchase Price ...............................................................1
    2.03  Satisfaction of Indebtedness .................................................2
3.  ADDITIONAL UNDERTAKINGS AND COVENANTS ..............................................2
    3.01  Consents and Approvals .......................................................2
    3.02  Access; Investigations by Buyer ..............................................3
    3.03  Operation of Business of the Company .........................................4
    3.04  No Inconsistent Negotiations .................................................6
    3.05  Public Announcements .........................................................7
    3.06  Employees ....................................................................7
    3.07  Subsequent Events ............................................................7
    3.08  Access to Records ............................................................7
    3.09  Maintenance of Plans .........................................................8
4.  REPRESENTATIONS AND WARRANTIES OF THE COMPANY
    AND THE STOCKHOLDERS ...............................................................8
    4.01  Organization and Standing ....................................................8
    4.02  Subsidiaries .................................................................8
    4.03  Articles of Incorporation and Bylaws .........................................9
    4.04  Capitalization ...............................................................9
    4.05  Directors, Officers and Employees ............................................9
    4.06  Financial Statements .........................................................9
    4.07  No Liabilities ...............................................................10
    4.08  Accounts Receivable ..........................................................10
    4.09  Taxes ........................................................................11
    4.10  Conduct of Business; Absence of Material Adverse Change ......................13
    4.11  Real Property ................................................................14
    4.12  Assets .......................................................................14
    4.13  Insurance ....................................................................14
    4.14  Intellectual Property ........................................................15
    4.15  Debt Instruments .............................................................15
    4.16  Leases .......................................................................15
    4.17  Other Agreements .............................................................16
    4.18  Books and Records ............................................................18
    4.19  Litigation; Disputes .........................................................18
    4.20  Labor Relations ..............................................................19
    4.21  Pension and Benefit Plans ....................................................19
    4.22  Environmental ................................................................22
    4.23  Transactions with Related Parties ............................................23
    4.24  Restrictions and Consents ....................................................24
</TABLE>

                                     - i -

<PAGE>   3

<TABLE>
<S>                                                                                    <C>
    4.25  Authorization ................................................................24
    4.26  Absence of Violation .........................................................24
    4.27  Copies of Documents ..........................................................25
    4.28  Binding Obligation ...........................................................25
    4.29  Disclosure ...................................................................25
 5. REPRESENTATIONS AND WARRANTIES OF THE
    STOCKHOLDERS .......................................................................26
    5.01  Title to Capital Stock .......................................................26
    5.02  Authority and Capacity .......................................................26
    5.03  Absence of Violation .........................................................26
    5.04  Restrictions and Consents ....................................................26
    5.05  Binding Obligation ...........................................................27
    5.06  Transfer of Title ............................................................27
6.  REPRESENTATIONS AND WARRANTIES OF BUYER ............................................27
    6.01  Organization and Standing ....................................................27
    6.02  Authorization ................................................................27
    6.03  Binding Obligation ...........................................................28
    6.04  No Registration Under the Securities Act .....................................28
    6.05  Acquisition for Investment ...................................................28
    6.06  Evaluation of Merits and Risks of Investment .................................28
    6.07  Disclosure ...................................................................29
7.  CONDITIONS PRECEDENT TO OBLIGATIONS OF THE
    COMPANY AND THE STOCKHOLDERS .......................................................29
    7.01  Representations and Warranties ...............................................29
    7.02  Performance ..................................................................29
    7.03  Buyer's Certificate ..........................................................29
    7.04  Documents at Closing .........................................................30
    7.05  Consulting Agreement .........................................................30
    7.06  Legal Opinion ................................................................30
8.  CONDITIONS PRECEDENT TO OBLIGATIONS OF BUYER .......................................30
    8.01  Representations and Warranties ...............................................30
    8.02  Performance ..................................................................30
    8.03  Absence of Adverse Changes ...................................................31
    8.04  Legal Proceedings ............................................................31
    8.05  Officer's Certificate ........................................................31
    8.06  Stockholders' Certificate ....................................................31
    8.07  Subordination Agreement ......................................................31
    8.08  Documents at Closing .........................................................31
    8.09  Consents .....................................................................32
    8.10  Resignation of Directors .....................................................32
    8.11  Consulting Agreement .........................................................32
    8.12  Legal Opinion ................................................................32
    8.13  Minimum Net Assets ...........................................................32
    8.14  Noncompetition Agreements ....................................................33
</TABLE>

                                     - ii -

<PAGE>   4

<TABLE>
<S>                                                                                    <C>
    8.15  Termination of Stockholders' Agreement .......................................33
9.  CLOSING ............................................................................33
    9.01  Closing of Sale and Purchase .................................................33
    9.02  Deliveries by the Stockholders ...............................................33
    9.03  Deliveries by the Company ....................................................33
    9.04  Deliveries by Buyer ..........................................................34
10. SURVIVAL OF REPRESENTATIONS; INDEMNIFICATION;
    REMEDIES ...........................................................................35
    10.01 Survival of Representations ..................................................35
    10.02 Agreement of Stockholders to Indemnify .......................................36
    10.03 Agreement of Buyer to Indemnify ..............................................36
    10.04 Conditions of Indemnification ................................................37
    10.05 No Recourse Against the Company ..............................................39
    10.06 Specific Performance .........................................................39
    10.07 Remedies Cumulative ..........................................................39
11. TAX MATTERS ........................................................................39
    11.01 Section 338(h)(10) Election ..................................................39
    11.02 Allocation of Purchase Price .................................................40
    11.03 S Corporation Status .........................................................40
    11.04 Tax Returns and Payments .....................................................41
    11.05 Cooperation on Tax Matters ...................................................42
    11.06 Certain Taxes ................................................................42
    11.07 Tax Audits ...................................................................43
12. TERMINATION ........................................................................43
    12.01 Termination ..................................................................43
    12.02 Effect of Termination ........................................................44
13. MISCELLANEOUS ......................................................................44
    13.01 Additional Actions and Documents .............................................44
    13.02 Brokers ......................................................................44
    13.03 Expenses .....................................................................45
    13.04 Assignment ...................................................................45
    13.05 Entire Agreement; Amendment ..................................................46
    13.06 Waiver .......................................................................46
    13.07 Consent to Jurisdiction ......................................................46
    13.08 Severability .................................................................47
    13.09 Governing Law ................................................................47
    13.10 Notices ......................................................................47
    13.11 Headings .....................................................................49
    13.12 Execution in Counterparts ....................................................49
    13.13 Limitation on Benefits .......................................................49
    13.14 Binding Effect ...............................................................50
</TABLE>

                                     - iii -
<PAGE>   5
                            STOCK PURCHASE AGREEMENT

               THIS STOCK PURCHASE AGREEMENT (this "Purchase Agreement") is
entered into as of March 30, 2001, among BTG, INC., a Virginia corporation
("Buyer"), RESEARCH PLANNING, INC., a Delaware corporation (the "Company"),
REYNALDO P. MADURO, SR., CHARLES H. LYON, III and GRANT C. PETERSON (each a
"Stockholder", and collectively, the "Stockholders").

               WHEREAS, the Stockholders own all of the issued and outstanding
shares of capital stock of the Company as set forth on Exhibit A hereto
(collectively, the "Shares"); and

               WHEREAS, the Stockholders desire to sell and Buyer desires to
purchase, all of the Shares at the price and upon the terms and conditions
hereinafter set forth.

               NOW, THEREFORE, in consideration of the foregoing and of the
mutual covenants and agreements hereinafter set forth, the parties hereto hereby
agree as follows:

1.      DEFINITIONS

        For all purposes of this Purchase Agreement, certain capitalized terms
specified in Exhibit B shall have the meanings in this Purchase Agreement as are
ascribed to them in Exhibit B, except as otherwise expressly provided in this
Purchase Agreement.

2.      SALE AND PURCHASE OF SHARES

        2.01   SALE AND PURCHASE OF SHARES

               On the basis of the representations, warranties and agreements
contained herein, and subject to the terms and conditions hereof, each
Stockholder agrees to sell to Buyer, and Buyer agrees to purchase from such
Stockholder, all of the Shares owned by such Stockholder for the purchase price
specified in Section 2.02.

        2.02   PURCHASE PRICE

               The aggregate purchase price for all of the Shares shall be Nine
Million Dollars ($9,000,000) (the "Purchase Price"). The Purchase Price shall be

<PAGE>   6

paid to the Stockholders in the form of subordinated promissory notes made
payable to each Stockholder (the "Promissory Notes"), executed and delivered by
Buyer at Closing. The Promissory Notes shall be in the form of Exhibit C
attached hereto. The Stockholders acknowledge and agree that the Promissory
Notes shall be subject to the terms and conditions of a subordination agreement
(the "Subordination Agreement") to be executed and delivered at Closing in
substantially the same form as Exhibit D hereto. The principal amount of the
Promissory Note issuable to each Stockholder is set forth opposite such
Stockholder's name on Exhibit A hereto.

        2.03   SATISFACTION OF INDEBTEDNESS

               At Closing, Buyer shall, subject to the terms and conditions of
this Purchase Agreement, pay the amounts outstanding under the Credit Agreement
as stated in and in accordance with the payoff letter delivered pursuant to
Section 9.03(i) hereof.

3.      ADDITIONAL UNDERTAKINGS AND COVENANTS

        3.01   CONSENTS AND APPROVALS

               (a)     Subject to Section 3.01(c) hereof, Buyer, the Company
and the Stockholders shall use their respective reasonable best efforts to take
all measures reasonably necessary or advisable to secure such consents,
authorizations and approvals of governmental authorities and of private persons
or entities with respect to the transactions contemplated by this Purchase
Agreement, and the performance of all other obligations of such parties
hereunder, as may be required by any applicable Laws or by any Agreement to
which Buyer, the Company or the Stockholders is a party or by which Buyer, the
Company or the Stockholders is bound.

               (b)     Subject to Section 3.01(c) hereof, Buyer, the Company
and the Stockholders shall (i) cooperate in the filing of all forms,
notifications, reports and information, if any, required pursuant to applicable
statutes, rules, regulations or orders of any governmental authority in
connection with the transactions contemplated by this Purchase Agreement and
(ii) use their respective reasonable best efforts to cause any applicable
waiting periods thereunder to expire and any objections to the transactions
contemplated hereby to be withdrawn before the Closing.

               (c)     Notwithstanding anything to the contrary contained in
this Purchase Agreement, prior to the Closing none of the parties hereto shall,
without the prior written consent of Buyer, seek to novate any of the Company's

                                     - 2 -
<PAGE>   7

Government Contracts. The parties hereto acknowledge and agree that, unless
otherwise agreed in writing by Buyer and the Company, no novations under the
Company's Government Contracts shall be conditions precedent to the obligations
of any party hereto to consummate the transactions hereunder. The parties hereto
further acknowledge and agree that the Company is required under the terms of
certain of the Government Contracts to which it is a party to notify the
applicable governmental authorities that the Company has entered into this
Purchase Agreement. The parties hereto shall cooperate with each other in
providing such notices and each such notice shall be in a form mutually
acceptable to the Company and Buyer. In addition, promptly following the
execution and delivery of this Purchase Agreement, the Company and the
Stockholders shall provide all required notifications to the applicable
governmental agencies under the Restricted Contracts of the entering into of
this Purchase Agreement, and request that the contracting parties and
administrative contracting officers under the Restricted Contracts obtain from
the Small Business Administration (the "SBA") waivers to permit the Restricted
Contracts to continue to be performed from and after the Closing Date. Such
notifications and requests to obtain waivers shall be subject to the approval of
Buyer, which approval shall not be unreasonably withheld. From and after the
Closing Date, the Stockholders shall take such actions and execute such
documents as Buyer may reasonably request in connection with any novations,
notifications or waivers that Buyer may elect to pursue under the Company's
Government Contracts.

        3.02   ACCESS; INVESTIGATIONS BY BUYER

               (a)     At all times through the Closing Date, the Company
shall, upon reasonable prior notice and during normal business hours, provide to
representatives of Buyer access to the offices, books, Agreements, records
(including, without limitation, tax returns and correspondence with
accountants), officers, directors and employees of the Company (provided such
access shall not cause any unreasonable disruption in the conduct of the
Company's business), and will furnish representatives of Buyer such financial
and operating data and other information with respect to the business and Assets
of the Company as Buyer may reasonably request, including, without limitation,
Agreements with clients, customers, vendors, lessors, licensors and suppliers of
the Company. Buyer agrees at all times through the Closing Date to (i) keep
confidential all such information that is identified by the Company as being of
a confidential nature, (ii) not use such confidential information on its own
behalf, except in connection with the transactions contemplated hereby, or on
behalf of any other person, firm or entity, and (iii) not disclose such
confidential information to any third party (other than to Buyer's counsel,
accountants and other consultants in connection with the transactions
contemplated hereby) without the Company's advance written authorization;
provided, however, that Buyer shall have no such obligations with

                                     - 3 -
<PAGE>   8

respect to confidential information that (A) was lawfully obtained by it not
subject to restrictions of confidentiality; (B) is a matter of public knowledge;
or (C) has been or is hereafter publicly disclosed other than by or through
Buyer. In the event this Purchase Agreement is terminated, Buyer will return to
the Company or destroy, as the Company may direct, all documents, workpapers and
other materials furnished to Buyer relating to the transactions contemplated
hereunder, whether obtained before or after the execution of this Purchase
Agreement. Nothing in this Section 3.02(a) shall limit Buyer's obligations under
the Confidentiality Agreement.

               (b)     The Company and the Stockholders hereby acknowledge that
each of them has obtained and may continue to obtain knowledge of and access to
confidential and valuable business information relating to Buyer not generally
known by or available to the general public, including, without limitation,
information to which the Stockholders obtains access pursuant to Section 3.08
hereof. The Company and the Stockholders each agree at all times through the
Closing Date and for a period of five (5) years thereafter, to (i) keep
confidential all such information, (ii) not use such confidential information on
its own behalf, except in connection with the transactions contemplated hereby,
or on behalf of any other person, firm or entity, and (iii) not disclose such
confidential information to any third party (other than to the Company's
counsel, accountants and other consultants in connection with the transactions
contemplated hereby) without Buyer's advance written authorization; provided,
however, that the Company and the Stockholders shall have no such obligations
with respect to confidential information that (A) was lawfully obtained by it
not subject to restrictions of confidentiality; (B) is a matter of public
knowledge; or (C) has been or is hereafter publicly disclosed other than by or
through the Company. In the event this Purchase Agreement is terminated, the
Company and the Stockholders will return to Buyer or destroy, as Buyer may
direct, all documents, workpapers and other materials furnished to such parties
relating to the transactions contemplated hereunder, whether obtained before or
after the execution of this Purchase Agreement. Nothing contained in this
Section 3.02(b) shall limit the obligations of the Company and the Stockholders
under the Confidentiality Agreement.

        3.03   OPERATION OF BUSINESS OF THE COMPANY

               (a)     At all times through the Closing Date, the Company shall
use its reasonable best efforts to (i) preserve its business organization and
its present relationships with customers, suppliers, consultants, employees and
any other persons having business relations with the Company in the Ordinary
Course of Business; and (ii) maintain all of its Assets in good operating
condition and repair (normal wear and tear excepted) in the Ordinary Course of
Business.

                                     - 4 -
<PAGE>   9

               (b)     Except as set forth in the Disclosure Schedule, at all
times through the Closing Date, the Company shall conduct its business
substantially in the manner heretofore conducted and only in the Ordinary Course
of Business and shall not, without the prior written consent of Buyer: (i) issue
any capital stock, bonds or other corporate securities or debt instruments,
grant any options, warrants or other rights calling for the issuance thereof, or
borrow any funds; (ii) declare, set aside or pay any dividends or distributions
of any Assets, except for the payment of the Stockholders' Transaction Expenses
permitted to be paid by the Company pursuant to Section 13.03 of this Purchase
Agreement; (iii) directly or indirectly redeem, purchase or otherwise acquire
any of its capital stock, any securities convertible into capital stock, or any
other securities; (iv) effect a split, reclassification or other change in or of
any of its capital stock; (v) amend its certificate of incorporation or bylaws;
(vi) grant any increase in the compensation or benefits payable, or to become
payable, by the Company to any of its directors, officers, employees or
consultants, or make any accrual or arrangement for or payment of bonuses or
special compensation of any kind to any director, officer or employee; (vii)
directly or indirectly guarantee or agree to guarantee the obligations of
others; (viii) enter into or make or permit any amendment to the terms or
conditions of any of the loans under the Credit Agreement, or enter into or make
or permit any amendment or termination of any other Agreement which the Company
or the Stockholders reasonably believes is likely to have a Material Adverse
Effect; (ix) mortgage, pledge or subject to any Encumbrance any of its Assets;
(x) cancel any indebtedness owing to the Company or any claims which the Company
may possess (other than the resolution of claims under any Agreement in the
Ordinary Course of Business which would not have a Material Adverse Effect), or
waive any rights of substantial value; (xi) sell, assign or transfer any
Intellectual Property; (xii) sell, exchange, transfer or otherwise dispose of
any interest in any Asset (other than in the Ordinary Course of Business);
(xiii) violate any Laws which have or could reasonably be expected to have a
Material Adverse Effect; (xiv) commit any act or omit to do any act, or engage
in any activity or transaction or incur any obligation (by conduct or
otherwise), which the Company or the Stockholders reasonably expects to have a
Material Adverse Effect; or (xv) make any loan or advance to any stockholder,
officer or director of the Company or to any other person, except for the
payment of the Stockholders' Transaction Expenses permitted to be paid by the
Company pursuant to Section 13.03 of this Purchase Agreement. Prior to the
Closing Date, the Company and the Stockholders on behalf of the Company (i) will
not do or agree to do any of the things listed in clauses (b) through (s) of
Section 4.10 and (ii) will maintain all insurance, which shall meet the
requirements of Section 4.13.

               (c)     The Company shall notify Buyer promptly of any material
adverse change in the business, operations, prospects, condition (financial or
otherwise), Assets or liabilities of the Company, including, without limitation,
information (including, without limitation, copies of all Documents relating
thereto)

                                     - 5 -
<PAGE>   10

concerning all claims instituted, threatened or asserted against or affecting
the Company or its business or Assets at law or in equity, before or by any
court or governmental authority.

               (d)     The Company shall keep proper books of record and
account in which true and complete entries will be made of all transactions in
accordance with generally accepted accounting principles applied on a basis
consistent with prior periods, and shall supply to Buyer such Documents
(financial or otherwise) with respect thereto as Buyer shall reasonably request.

               (e)     The Company shall inform and discuss with Buyer on a
regular and ongoing basis the management of the business and Assets of the
Company, including, without limitation, (i) any significant new Agreements or
transactions proposed to be entered into, (ii) persons proposed to be employed
or terminated by the Company outside of the Ordinary Course of Business, and
(iii) any other significant developments relating to the business or Assets of
the Company; provided, however, that Buyer shall have no express or implied
power, authority or responsibility with respect to the Company or its business,
Assets or Agreements. Without limiting the foregoing, the Company shall not
enter into any agreement, understanding, commitment or other arrangement
(whether written or oral) with any Affiliate or any officer, director, employee
or agent thereof after the date hereof without the prior written consent of
Buyer.

        3.04   NO INCONSISTENT NEGOTIATIONS

               Neither the Company nor the Stockholders shall, nor shall any of
them authorize or knowingly permit any director, officer, employee or other
agent of the Company, directly or indirectly, to (i) take any action to solicit,
initiate or encourage the submission of a Proposal; (ii) participate in any
negotiations regarding, or furnish to any other person, entity or group any
nonpublic information with respect to, a Proposal, or (iii) otherwise cooperate
in any way with, or assist or participate in, facilitate, or encourage, any
effort or attempt by any other person, entity or group to make a Proposal to the
Stockholders or the Company.

               In addition, the Company and the Stockholders shall use
reasonable efforts to cause any financial advisor engaged by the Company or the
Stockholders for any purpose within the past twelve (12) months to refrain from
taking any of the actions referred to in clause (i) or (ii) of the immediately
preceding sentence. The Company and the Stockholders shall immediately cease any
existing discussions or negotiations with any parties (other than Buyer)
conducted heretofore with respect to any of the foregoing. The Company or the
Stockholders shall notify Buyer promptly if any Proposal, or any inquiry or
contact with any person with respect thereto, is made and shall, in any such
notice to Buyer, indicate in reasonable detail

                                     - 6 -
<PAGE>   11

the identity of the offeror and the terms and conditions of the Proposal,
including the proposed financing for such Proposal if contained therein. The
Company and the Stockholders shall respond to any such Proposal only to the
extent consistent with their obligations under this Purchase Agreement.

        3.05   PUBLIC ANNOUNCEMENTS

               The Stockholders on the one hand, and Buyer on the other hand,
agree that neither they nor the Company will issue any press release or
otherwise make any public statements concerning this Agreement or the
transactions contemplated hereby at any time prior to the Closing Date without
the prior written consent of Buyer or the Stockholders, as the case may be,
except to the extent that any such disclosure is required by Buyer under
applicable Law.

        3.06   EMPLOYEES

               The Company shall use its reasonable best efforts to encourage
the current employees of the Company to continue their employment with the
Company following the Closing Date; provided, however, that the Company shall
not be deemed to guarantee the continued employment of any of its employees.

        3.07   SUBSEQUENT EVENTS

               The Company and the Stockholders shall notify Buyer promptly in
writing of the occurrence of any event, or the failure of any event to occur,
prior to the Closing that results in a material omission from, or material
breach of, any of the covenants, representations or warranties made by or on
behalf of the Company or the Stockholders in this Purchase Agreement or the
Disclosure Schedule. Prior to the Closing, the Company and the Stockholders
promptly will supplement or amend the Disclosure Schedule delivered pursuant
hereto with respect to any material matter hereafter arising which, if existing,
occurring or known at the date of this Agreement, would have been required to be
set forth or described in such Disclosure Schedule or which is necessary to
correct any information in such Disclosure Schedule which has been rendered
materially inaccurate thereby.

        3.08   ACCESS TO RECORDS

               For a period five (5) years after the Closing Date, Buyer shall,
upon reasonable prior notice and during normal business hours, provide to the
Stockholders access to the financial and accounting books and records of the
Company for periods prior to the Closing Date and which are in the Company's
possession as of Closing, solely for purposes of assisting the Stockholders in
connection with any tax audit or other governmental investigation of the

                                     - 7 -
<PAGE>   12

Stockholders relating to the business of the Company for the period prior to
Closing or for purposes of defending or investigating any Losses for which
indemnification is sought by Buyer pursuant to Section 10.02 hereof; provided,
however, such access shall not cause any unreasonable disruption in the conduct
of Buyer's business. Buyer shall not dispose of such books and records during
the five (5) year period after the Closing Date.

        3.09   MAINTENANCE OF PLANS

               During the period from the Closing Date through December 31,
2001, Buyer shall either maintain each of the Company's current pension and
benefit plans (as more particularly described on Schedule 4.21), or, in the
alternative, provide substantially similar plans to the Company's employees.

4.      REPRESENTATIONS AND WARRANTIES OF THE COMPANY AND THE STOCKHOLDERS

               The Company and the Stockholders jointly and severally represent
and warrant to Buyer as follows:

        4.01   ORGANIZATION AND STANDING

               The Company is a corporation duly organized and validly existing
under the laws of the State of Delaware, and has the corporate power and
authority to own, operate and lease its Assets, to carry on its business as
currently conducted, to execute and deliver this Purchase Agreement and to carry
out the transactions contemplated hereby. The Company is duly qualified to
conduct business as a foreign corporation and is in good standing in the states,
countries and territories listed on the Disclosure Schedule. The Company is not
qualified to conduct business in any other jurisdiction. There is no state,
country or territory wherein the absence of licensing or qualification as a
foreign corporation would have a Material Adverse Effect.

        4.02   SUBSIDIARIES

               The Company has no Subsidiaries and, except as set forth in the
Disclosure Schedule or the Audited Financial Statements, no equity investment or
other interest in, nor has the Company made advances or loans to, any
corporation, association, partnership, joint venture or other entity.

                                     - 8 -
<PAGE>   13

        4.03   ARTICLES OF INCORPORATION AND BYLAWS

               The Company has furnished to Buyer a true and complete copy of
the certificate of incorporation of the Company, as currently in effect,
certified as of a recent date by the Secretary of State of the State of
Delaware, and a true and complete copy of the bylaws of the Company, as
currently in effect, certified by the Company's corporate secretary. Such
certified copies are attached as exhibits to, and part of, the Disclosure
Schedule.

        4.04   CAPITALIZATION

               (a) The authorized capital stock of the Company consists of one
hundred thousand (100,000) shares of common stock, with no par value, of which
sixty-three thousand seven hundred fifty (63,750) shares are duly authorized and
validly issued and outstanding, fully paid and non-assessable and not subject to
preemptive rights. All of the issued and outstanding shares of capital stock of
the Company are beneficially and of record owned by the Stockholders, free and
clear of all Encumbrances, except such restrictions on the transfer of such
shares as may be applicable under federal and state securities laws. The Shares
constitute all of the issued and outstanding shares of capital stock of the
Company as of the Closing Date.

               (b) No shares of capital stock of the Company have been reserved
for any purpose. There are no outstanding securities convertible into or
exchangeable for capital stock of the Company and no outstanding options, rights
(preemptive or otherwise), or warrants to purchase or to subscribe for any
shares of such stock or other securities of the Company. Except as set forth in
the Disclosure Schedule, there are no outstanding Agreements affecting or
relating to the voting, issuance, purchase, redemption, repurchase or transfer
of the Company's capital stock or any other securities of the Company.

        4.05   DIRECTORS, OFFICERS AND EMPLOYEES

               The Disclosure Schedule lists all current directors, officers and
employees of the Company, showing each such person's name, position, and annual
remuneration, bonuses (except bonuses no portion of which is accrued and payable
for the current fiscal year) and fringe benefits for the current fiscal year and
the most recently completed fiscal year.

        4.06   FINANCIAL STATEMENTS

               The Company has prepared and furnished to Buyer (a) the audited
balance sheet of the Company as of the Balance Sheet Date, and the audited

                                     - 9 -
<PAGE>   14

statements of income, stockholder's equity and cash flows for the twelve (12)
month period ended as of the Balance Sheet Date (such audited financial
statements, including the notes thereto, collectively, the "Audited Financial
Statements"), together with the accompanying report thereon of McGladrey &
Pullen, LLP dated March 9, 2001; and (b) the unaudited balance sheet of the
Company as of March 16, 2001, and the unaudited statement of income for the
twelve (12) week period then ended (such unaudited statements, collectively, the
"Unaudited Financial Statements"; together with the Audited Financial
Statements, the "Financial Statements"). All of the Financial Statements,
including, without limitation, the notes thereto: (i) have been prepared from
the books and records of the Company, (ii) present fairly the financial position
of the Company as of the respective dates and the results of operations and cash
flows for the respective periods indicated, and (iii) have been prepared in
accordance with generally accepted accounting principles applied on a basis
consistent with prior accounting periods (subject to normal audit adjustments in
the case of unaudited statements). The Disclosure Schedule sets forth all
changes in accounting methods (for financial accounting purposes) at any time
made, agreed to, requested or required with respect to the Company for any of
the periods covered by the Financial Statements.

        4.07   NO LIABILITIES

               Except as reflected in the Financial Statements (or disclosed in
the associated footnotes to the Audited Financial Statements) or as described in
the Disclosure Schedule, there exist no material liabilities (whether contingent
or absolute, matured or unmatured, known or unknown) of the Company. Except as
described in the Disclosure Schedule or the Unaudited Financial Statements,
since the Balance Sheet Date, the Company has not incurred any liabilities
(whether contingent or absolute, matured or unmatured, known or unknown) other
than in the Ordinary Course of Business.

        4.08   ACCOUNTS RECEIVABLE

               Except as set forth in the Disclosure Schedule, the accounts
receivable of the Company shown on the balance sheets included in the Financial
Statements, or thereafter acquired by the Company, have arisen only from bona
fide transactions in the Ordinary Course of Business. Neither the Company nor
the Stockholders has any knowledge of any facts or circumstances generally
(other than general economic conditions) which would result in any material
increase in the uncollectability of such accounts receivable in excess of the
reserves therefor set forth in the Financial Statements.

                                     - 10 -
<PAGE>   15

        4.09   TAXES

               (a)     Except as set forth in the Disclosure Schedule, the
Company has (or, in the case of returns becoming due after the date hereof and
on or before the Closing Date, will have prior to the Closing Date) duly filed
all the Company Tax Returns required to be filed by the Company on or before the
Closing Date with respect to all applicable Taxes, and no penalties or other
charges are or will become due with respect to any of the Company Tax Returns as
the result of the late filing thereof. All of the Company Tax Returns are (or,
in the case of returns becoming due after the date hereof and on or before the
Closing Date, will be) true and complete in all material respects. Except as set
forth in the Disclosure Schedule, the Company has paid all Taxes due or claimed
to be due by any taxing authority (whether or not shown on any Company Tax
Return). No claim has ever been made by an authority in a jurisdiction where the
Company does not file Tax Returns that it is or may be subject to taxation by
that jurisdiction. There are no Security Interests on any of the assets of the
Company that arose in connection with any failure (or alleged failure) to pay
any Tax.

               (b)     The Company has withheld and paid all Taxes required to
have been withheld and paid in connection with amounts paid or owing to any
employee, independent contractor, creditor, stockholder, or other third party.

               (c)     There is no action, suit, proceeding, audit,
investigation or claim pending or, to the knowledge of the Company or the
Stockholders, threatened in respect of any Taxes for which the Company is or may
become liable, nor has any deficiency or claim for any such Taxes been proposed,
asserted or, to the knowledge of the Company or the Stockholders, threatened.
Except as set forth in the Disclosure Schedule, the Company has not consented to
any waivers or extensions of any statute of limitations with respect to any
taxable year of the Company. Except as set forth in the Disclosure Schedule,
there is no Agreement, waiver or consent providing for an extension of time with
respect to the assessment or collection of any Taxes against the Company, and no
power of attorney granted by the Company with respect to any tax matters is
currently in force.

               (d)     The Company has furnished to Buyer true and complete
copies of all the Company Tax Returns for the past five (5) years and all
written communications relating to any such Company Tax Returns or to any
deficiency or claim proposed and/or asserted, irrespective of the outcome of
such matter, but only to the extent such items relate to tax years (i) which are
subject to an audit, investigation, examination or other proceeding, or (ii)
with respect to which the statute of limitations has not expired.

               (e)     The Disclosure Schedule sets forth (i) all federal tax
elections that currently are in effect with respect to the Company, and (ii) all
elections for

                                     - 11 -
<PAGE>   16

purposes of foreign, state or local Taxes and all consents or Agreements for
purposes of federal, foreign, state or local Taxes in each case that reasonably
could be expected to have a material effect on the Company or any of its Assets
or operations after the Closing. The Disclosure Schedule sets forth all changes
in accounting methods for Tax purposes at any time made, agreed to, requested or
required with respect to the Company within the past five (5) years.

               (f)     The Company (i) is not and within the past five (5)
years has not been a partner in a partnership or an owner of an interest in an
entity treated as a partnership for federal income tax purposes; (ii) has not
executed or filed with the Internal Revenue Service any consent to have the
provisions of Section 341(f) of the Code apply to it; (iii) is not subject to
Section 999 of the Code; (iv) is not a passive foreign investment company as
defined in Section 1296(a) of the Code; and (v) is not a party to an Agreement
relating to the sharing, allocation or payment of, or indemnity for, Taxes.

               (g)     Except as set forth in the Disclosure Schedule, the
unpaid Taxes of the Company (i) did not, as of the date of the Unaudited
Financial Statements, exceed the reserve for Tax liability (rather than any
reserve for deferred Taxes established to reflect timing differences between
book and Tax income) set forth on the face of the balance sheet in the Unaudited
Financial Statements (rather than any notes thereto) and (ii) do not exceed that
reserve as adjusted for the passage of time through the Closing Date in
accordance with past custom and practice of the Company in filing Tax Returns.

               (h)     The Company (and any predecessor of the Company) has
timely filed a valid election to be treated as an S corporation in accordance
with the provisions of Code Sections 1361 and 1362, effective for its tax year
beginning February 27, 1989, and at all times subsequent thereto, the Company
qualified and continues to qualify as an S corporation for all years and periods
thereafter including the Closing Date.

               (i)     The Company has no "qualified subchapter S subsidiaries"
within the meaning of Section 1361(b)(3)(B) of the Code.

               (j)     The Company will not be liable for any Tax under Code
Section 1374 or any similar provision of state or local law in connection with
the deemed sale of the Company's assets caused by the Section 338(h)(10)
Election. The Company has not in the past ten (10) years (i) acquired assets
from another corporation in a transaction in which the Company's Tax basis for
the acquired assets was determined, in whole or in part, by reference to the Tax
basis of the acquired assets (or any other property) in the hands of the
transferor or (ii) acquired the stock of any corporation which is a qualified
subchapter S subsidiary.

                                     - 12 -
<PAGE>   17

               (k)     The Disclosure Schedule sets forth all state and local
jurisdictions in which the Company is required to file Company Tax Returns, and
indicates with respect to each state whether or not the Company is a validly
electing S Corporation within the meaning of Code Sections 1361 and 1362 in such
state.

        4.10   CONDUCT OF BUSINESS; ABSENCE OF MATERIAL ADVERSE CHANGE

               Other than as set forth in the Disclosure Schedule, since the
Balance Sheet Date, there has been no material adverse change, and no change
except in the Ordinary Course of Business, in the business, operations,
condition (financial or otherwise), Assets or liabilities of the Company. Except
as set forth in the Disclosure Schedule, since the Balance Sheet Date, the
Company has conducted its business substantially in the manner heretofore
conducted and only in the Ordinary Course of Business, and the Company has not
(a) incurred a significant loss of, or significant injury to, any Assets of the
Company as the result of any fire, explosion, flood, windstorm, earthquake,
labor trouble, riot, accident, act of God or public enemy or armed forces, or
other casualty; (b) issued any capital stock, bonds or other corporate
securities or debt instruments, granted any options, warrants or other rights
calling for the issuance thereof, or borrowed any funds; (c) incurred, or become
subject to, any obligation or liability (absolute or contingent, matured or
unmatured, known or unknown), except current liabilities incurred in the
Ordinary Course of Business; (d) discharged or satisfied any Encumbrance or paid
any obligation or liability (absolute or contingent, matured or unmatured, known
or unknown) other than current liabilities shown in the balance sheets included
in the Financial Statements, and current liabilities incurred since the Balance
Sheet Date in the Ordinary Course of Business; (e) declared or made payment of,
or set aside for payment, any dividends or distributions of any Assets, or
purchased, redeemed or otherwise acquired any of its capital stock, any
securities convertible into capital stock, or any other securities; (f)
mortgaged, pledged or subjected to any Encumbrance any of its Assets; (g) sold,
exchanged, transferred or otherwise disposed of any of its Assets, or canceled
any debts or claims, except in each case in the Ordinary Course of Business; (h)
written down the value of any Assets or written off as uncollectible any notes
or accounts receivable, except write-downs and write-offs in the Ordinary Course
of Business, none of which had or would have a Material Adverse Effect; (i)
entered into any transactions other than in the Ordinary Course of Business; (j)
increased the rate of compensation or benefits payable, or to become payable, by
it to any of its directors, officers, employees or consultants; (k) made or
permitted any amendment or termination of any Agreement to which it is a party
which would have a Material Adverse Effect; (l) through negotiation or otherwise
made any commitment or incurred any liability to any labor organization; (m)
made any accrual or arrangement for or payment of bonuses or special
compensation of any kind to any director, officer or employee; (n) directly or
indirectly paid any severance or termination pay to any officer or

                                     - 13 -
<PAGE>   18

employee in excess of two (2) months' salary; (o) made capital expenditures, or
entered into commitments therefor, aggregating more than Fifty Thousand Dollars
($50,000); (p) made any change in any method of accounting or accounting
practice; (q) entered into any transaction of the type described in Section
4.23; (r) made any charitable contributions or pledges; or (s) made an Agreement
to do any of the foregoing.

        4.11   REAL PROPERTY

               The Disclosure Schedule lists and sets forth a description of all
the Real Property. Such Real Property constitutes all Real Property which is
necessary for the Company to conduct its business as presently conducted and is
suitable and adequate for the uses for which it is currently devoted. The
Company does not hold any fee simple interest in any Real Property.

        4.12   ASSETS

               Except as set forth in the Disclosure Schedule, the Company has
good, valid and marketable title to all of its Assets, including, without
limitation, all Assets reflected in the balance sheets included in the Financial
Statements and all Assets purchased by the Company since the Balance Sheet Date
(except for Assets reflected in such balance sheets or acquired since the
Balance Sheet Date which have been sold or otherwise disposed of in the Ordinary
Course of Business), free and clear of all Encumbrances. All personal property
of the Company material to the conduct of its business is in good operating
condition and repair (reasonable wear and tear excepted) and is suitable and
adequate for the uses for which it is intended or is being used.

        4.13   INSURANCE

               The Disclosure Schedule lists all policies of title, Asset, fire,
hazard, casualty, liability, life, worker's compensation and other forms of
insurance of any kind owned or held by the Company. All such policies: (a) are
with insurance companies financially sound and reputable; (b) are in full force
and effect; (c) are sufficient for compliance in all material respects by the
Company with all requirements of Law and of all Agreements to which the Company
is a party; (d) are valid and outstanding policies enforceable against the
insurer; (e) insure against risks of the kind customarily insured against and in
amounts customarily carried by companies similarly situated and by companies
engaged in similar businesses and owning similar properties and provide adequate
insurance coverage for the business and Assets of the Company and (f) provide
that they will remain in full force and effect through the respective dates set
forth in the Disclosure Schedule.

                                     - 14 -
<PAGE>   19

        4.14   INTELLECTUAL PROPERTY

               The Disclosure Schedule lists all Intellectual Property and
applications therefor owned or licensed by or registered in the name of the
Company. Except as otherwise specifically stated in the Disclosure Schedule, the
Company owns all of the Intellectual Property listed in the Disclosure Schedule
purported to be owned by the Company, pays no royalty to anyone with respect to
any Intellectual Property and, to the knowledge of the Company and the
Stockholders, has the right to bring action for the infringement of such
Intellectual Property purported to be owned by the Company. The Company owns or
possesses adequate rights to use all Intellectual Property necessary to the
conduct of the present business of the Company. Neither the Company nor the
Stockholders has any knowledge, and has not received any notice to the effect,
that any product the Company sells or that any service the Company renders, or
that the marketing or use by the Company or another of any such product or
service, may or is claimed to infringe any Intellectual Property or legally
protectable right of another.

        4.15   DEBT INSTRUMENTS

               The Disclosure Schedule sets forth all mortgages, indentures,
notes, guarantees and other Agreements for or relating to borrowed money
(including, without limitation, conditional sales agreements and capital leases)
to which the Company is a party or which have been assumed by the Company or to
which any Assets of the Company are subject. The Company has performed all the
material obligations required to be performed by it to date and is not in
default in any material respect under any of the foregoing, and, to the
Company's and the Stockholders' knowledge, there has not occurred any event
which (whether with or without notice, lapse of time or the happening or
occurrence of any other event) would constitute such a default. As of the
Closing Date, all amounts outstanding under the Credit Agreement will be
prepayable in full, without premium or penalty, in accordance with its terms.

        4.16   LEASES

               The Disclosure Schedule lists all leases and other Agreements
under which the Company is lessee or lessor of any Asset, or holds, manages or
operates any Asset owned by any third party, or under which any Asset owned by
the Company is held, operated or managed by a third party. Each such lease and
other Agreement is in full force and effect and constitutes a legal, valid and
binding obligation of, and is legally enforceable against, the Company and, to
the knowledge of the Company and the Stockholders, the other parties thereto.
All governmental approvals required under applicable Laws to have been obtained
by the Company with respect to such leases and other Agreements, if any, have
been obtained, all

                                     - 15 -
<PAGE>   20

filings or registrations required under applicable Laws to have been made by the
Company therefor, if any, have been made, and, to the knowledge of the Company
and the Stockholders, there have been no threatened cancellations thereof and
are no outstanding material disputes thereunder. The Company has in all material
respects performed all obligations thereunder required to be performed by the
Company to date. The Company is not and, to the knowledge of the Company and the
Stockholders, no other party is in default in any material respect under any of
the foregoing, and, except as set forth in the Disclosure Schedule, there has
not, to the knowledge of the Company or the Stockholders, occurred any event
which (whether with or without notice, lapse of time or the happening or
occurrence of any other event) would constitute such a default. All of the
Assets subject to such leases are in good operating condition and repair, normal
wear and tear excepted.

        4.17   OTHER AGREEMENTS

               (a)     The Disclosure Schedule lists all Agreements to which
the Company is a party or by which the Company is bound at the date hereof. Each
such Agreement is in full force and effect and constitutes a legal, valid and
binding obligation of, and is legally enforceable against, the Company and, to
the knowledge of the Company and the Stockholders, the other parties thereto.
All governmental approvals required under applicable Laws to have been obtained
by the Company with respect to such Agreements, if any, have been obtained, all
filings or registrations required under applicable Laws to have been made by the
Company therefor, if any, have been made, and, to the knowledge of the Company
and the Stockholders, there have been no threatened cancellations thereof and
there are no outstanding material disputes thereunder known to the Company or
the Stockholders. The Company has in all material respects performed all the
obligations thereunder required to be performed by the Company to date. The
Company is not and, to the knowledge of the Company and the Stockholders, no
other party is in default in any material respect under any of the Agreements
described in the Disclosure Schedule, and there has not, to the knowledge of the
Company or the Stockholders, occurred any event which (whether with or without
notice, lapse of time or the happening or occurrence of any other event) would
constitute such a default.

               (b)     Except as specified in the Disclosure Schedule, the
Company is not a party to any oral or written (i) Agreement for the employment
of any officer, employee, consultant, independent contractor or advisor; (ii)
license agreement or distributor, dealer, manufacturer's representative, sales
agency, advertising, property management or brokerage agreement; (iii) Agreement
with any labor organization or other collective bargaining unit; (iv) Agreement
for the future purchase of materials, supplies, services, merchandise or
equipment involving payments of more than Twenty-Five Thousand Dollars ($25,000)
over its remaining

                                     - 16 -
<PAGE>   21

term (including, without limitation, periods covered by any option to renew by
either party); (v) Agreement for the purchase, sale or lease of any real estate;
(vi) profit-sharing, bonus, incentive compensation, deferred compensation, stock
option, severance pay, stock purchase, employee benefit, insurance,
hospitalization, pension, retirement or other similar plan or Agreement; (vii)
Agreement for the purchase, sale or lease of any of its Assets other than in the
Ordinary Course of Business or the grant of any preferential rights to purchase
any of its Assets or rights; (viii) except for the Government Contracts,
Agreement which contains any provisions requiring the Company to indemnify any
other party thereto; (ix) joint venture agreement or other Agreement involving
the sharing of profits; (x) outstanding loan to any person or entity or
receivable due from the Stockholders or any Affiliate of the Company; (xi)
Agreement (including, without limitation, Agreements not to compete and
exclusivity Agreements) that imposes any restriction on any business operations
of the Company which, either individually or in the aggregate, would have a
Material Adverse Effect; or (xii) Government Contract.

               (c)     Except as set forth in the Disclosure Schedule, the
Company has never been debarred or suspended from contracting (as a prime
contractor or subcontractor at any tier) for or bidding on any Government
Contract or, at any time during the past ten (10) years, had a Government
Contract canceled or terminated, in whole or in part, by reason of a default or
alleged default on the part of the Company. The Company is not currently
debarred or suspended from (nor has it received written notice that it is under
investigation with respect to a possible debarment or suspension from) bidding
on or entering into any Government Contract. Except as set forth in the
Disclosure Schedule, with respect to any Government Contract in effect as of the
date of this Agreement, the Company has not received written notice (i) that any
such Government Contract may be or will be terminated for convenience or by
reason of a default or alleged default by the Company, (ii) that funding for any
such Government Contract or governmental program involving the Company will be
eliminated or substantially reduced or suspended, (iii) requiring or resulting
in loss of use or substantial impairment or interference of use by the Company
of any facilities owned by a governmental authority, or (iv) that any relevant
budget authority or contract authority has been exceeded with respect to any
such Government Contract to which the Company is a party. The Company does not
anticipate incurring any cost overrun with respect to any Government Contract to
which it is a party that is reasonably likely to have a Material Adverse Effect.

               (d)     Final audits of all of the Government Contracts of the
Company with the United States of America and its departments, commissions,
agencies and instrumentalities have been completed by the Defense Contract Audit
Agency for all fiscal years of the Company through and including its fiscal year
ended December 25, 1998. No issue has been raised in any such audit or in any
pending audit

                                     - 17 -
<PAGE>   22

covering subsequent years that could reasonably be expected to result in (i) the
suspension or debarment of the Company from bidding on or entering into any
Government Contract, (ii) the termination for default of any Government Contract
to which the Company is a party or under which the Company is providing goods or
services, or (iii) except as reserved for in the Audited Financial Statements,
any assertion or claim of material liability against the Company for an
equitable adjustment, price reduction, liquidated damages or monetary penalty,
or damages under the terms of such Government Contract or based on a default or
alleged default by the Company or other malfeasance or alleged malfeasance by
the Company arising out of or relating to the performance or failure to perform
by the Company thereunder.

               (e)     The Disclosure Schedule specifically identifies any and
all Government Contracts as to which final payment has not yet been made that
were awarded to the Company in reliance on its status as a small business, small
disadvantaged business, or under the Small Business Administration's Section
8(a) program (collectively, the "Restricted Contracts"). With respect to the
Restricted Contracts, all certifications concerning size, socio-economic, or
8(a) status were correct at the time submitted and the Company retained its
eligibility for the contract through contract award and execution of any
contract option periods.

        4.18   BOOKS AND RECORDS

               Except as set forth in the Disclosure Schedule, the books of
account, stock records, minute books and other records of the Company are true
and complete in all material respects, and the matters contained therein are
appropriately and accurately reflected in the Financial Statements to the extent
required to be reflected therein under generally accepted accounting principles
consistently applied.

        4.19   LITIGATION; DISPUTES

               (a)     Except as set forth in the Disclosure Schedule, there
are no actions, suits, claims, arbitrations, proceedings or investigations
pending, or, to the knowledge of the Company and the Stockholders, threatened
against, affecting or involving the Company or its business or Assets, or the
transactions contemplated by this Purchase Agreement, at Law or in equity or
admiralty, or before or by any court, arbitrator or governmental authority,
domestic or foreign. The Company is not operating under, subject to or in
default with respect to any order, award, writ, injunction, decree or judgment
of any court, arbitrator or governmental authority.

               (b)     Except as set forth in the Disclosure Schedule, the
Company is not currently involved in and, to the knowledge of the Company and
the

                                     - 18 -
<PAGE>   23

Stockholders, there are no threatened disputes with any of its current or former
employees, agents, brokers, distributors, vendors, customers, business
consultants, franchisees, franchisors, representatives or independent
contractors which, if adversely determined, would have a Material Adverse
Effect.

        4.20   LABOR RELATIONS

               There are no strikes, work stoppages, grievance proceedings,
union organization efforts or other material controversies pending, or, to the
Company's and the Stockholders' knowledge, threatened between the Company and
(i) any current or former employees of the Company or (ii) any union or other
collective bargaining unit representing such employees. Except as set forth in
the Disclosure Schedule, the Company has complied with and is in compliance in
all material respects with all Laws relating to employment or the workplace,
including, without limitation, provisions relating to wages, hours, collective
bargaining, safety and health, work authorization, equal employment opportunity,
immigration, withholding, unemployment compensation, worker's compensation,
employee privacy and right to know. Except as set forth in the Disclosure
Schedule, there are no collective bargaining agreements or employment agreements
between the Company and any of its employees not terminable at will. The
consummation of the transactions contemplated hereby will not cause Buyer or the
Company to incur or suffer any liability relating to, or obligation to pay,
severance, termination or other payments to any person or entity.

        4.21   PENSION AND BENEFIT PLANS

               (a)     Except as set forth in the Disclosure Schedule, the
Company (i) does not maintain and has not during the past five (5) years
maintained any Plan or Other Arrangement, (ii) is not and has not during the
past five (5) years been a party to any Plan or Other Arrangement and (iii) has
no obligations under any Plan or Other Arrangement.

               (b)     The Company has furnished to Buyer true and complete
copies of each of the following Documents: (i) the Documents setting forth the
terms of each Plan; (ii) all related trust agreements or annuity agreements (and
any other funding Document) for each Plan; (iii) for the three most recent plan
years, all annual reports (Form 5500 series) on each Plan that have been filed
with any governmental agency; (iv) the current summary plan description and
subsequent summaries of material modifications for each Title I Plan; (v) all
DOL opinions on any Plan and all correspondence relating to the request for and
receipt of each opinion; (vi) all Internal Revenue Service rulings, opinions or
technical advice relating to any Plan and all correspondence relating to the
request for and receipt of each ruling, opinion or technical advice; and (vii)
all Agreements with service

                                     - 19 -
<PAGE>   24

providers or fiduciaries for providing services on behalf of any Plan. For each
Other Arrangement, the Company has furnished to Buyer true and complete copies
of each policy, Agreement or other Document setting forth or explaining the
terms of the Other Arrangement, all related trust agreements or other funding
Documents (including, without limitation, insurance contracts, certificates of
deposit, money market accounts, etc.), other submissions with any governmental
agency within the last five (5) years, and all Agreements with service providers
or fiduciaries for providing services on behalf of any material Other
Arrangement.

               (c)     No Plan is a Multiemployer Plan, an ESOP, a Defined
Benefit Plan or a funded Welfare Plan.

               (d)     The Company has made all contributions and other
payments required by and required to have been paid under the terms of each Plan
and Other Arrangement and have taken no action (including, without limitation,
actions required by Law) relating to any Plan or Other Arrangement that will
increase any obligation of Buyer or the Company under any Plan or Other
Arrangement other than increases in employee compensation in the Ordinary Course
of Business.

               (e)     The Disclosure Schedule sets forth a list of all
Qualified Plans. All Qualified Plans and any related trust agreements or annuity
agreements (or any other funding Document) comply and have complied with ERISA,
the Code (including, without limitation, the requirements for Tax qualification
described in Section 401 thereof), and all other Laws. The trusts established
under such Qualified Plans are exempt from federal income taxes under Section
501(a) of the Code. Except for the Qualified Plans identified in the Disclosure
Schedule with respect to which the remedial amendment period under Code Section
401(b) within which to request a favorable determination letter has not yet
expired, the Company has received determination letters issued by the Internal
Revenue Service with respect to each Qualified Plan, and the Company has
furnished to Buyer true and complete copies of all such determination letters
and all correspondence relating to the applications therefor. All statements
made by or on behalf of the Company to the Internal Revenue Service in
connection with applications for determinations with respect to each Qualified
Plan were true and complete in all material respects when made and continue to
be true and complete in all material respects, except that demographic data and
composition of controlled group may have changed. Nothing has occurred since the
date of the most recent applicable determination letter that would adversely
affect the tax-qualified status of any Qualified Plan.

               (f)     The Company has complied in all material respects with
all applicable provisions of the Code, ERISA, the National Labor Relations Act,
Title VII of the Civil Rights Act of 1964, the Age Discrimination in Employment
Act, the Fair Labor Standards Act, the Securities Act, the Exchange Act, and all
other Laws pertaining to the Plans, Other Arrangements and other employee or

                                     - 20 -
<PAGE>   25

employment related benefits, and all premiums and assessments relating to all
Plans or Other Arrangements. The Company has no liability for any delinquent
contributions within the meaning of Section 515 of ERISA (including, without
limitation, related attorneys' fees, costs, liquidated damages and interest) or
for any arrearages of wages. The Company has no pending unfair labor practice
charges, contract grievances under any collective bargaining agreement, other
administrative charges, claims, grievances or lawsuits before any court,
governmental agency, regulatory body, or arbiter arising under any Law governing
any Plan, and, to the knowledge of the Company and the Stockholders, there exist
no facts that could give rise to such a claim.

               (g)     The Disclosure Schedule describes all transactions in
which the Company or any of the Plans has engaged in violation of Section 406(a)
or 406(b) of ERISA for which no exemption exists under Section 408 of ERISA and
all "prohibited transactions" (as such term is defined in Section 4975(c)(1) of
the Code), for which no exemption exists under Section 4975(c)(2) or 4975(d) of
the Code. The Company has furnished to Buyer true and complete copies of each
request for a prohibited transaction exemption and each exemption obtained in
response to such request. All such requests were true and complete when made and
continue to be true and complete.

               (h)     The Disclosure Schedule identifies any Plan that was an
employee pension benefit plan under Section 3(2) of ERISA that has terminated
since 1993. The Company has furnished to Buyer true and complete copies of all
government filings, representative employee communications, board minutes and
all other Documents relating to each Plan termination.

               (i)     No Plan or Other Arrangement, individually or
collectively, provides for any payment by the Company to any employee or
independent contractor that is not deductible under Section 162(m) or 404 of the
Code or that is an "excess parachute payment" pursuant to Section 280G of the
Code.

               (j)     The Company has not filed, and has had no obligation to
file, any Form 5330 (Return of Excise Taxes Related to Employee Benefit Plans)
on any Plan for which the liability would be material. The Company has no
liability for Taxes required to be reported on Form 5330.

               (k)     Except as required under Code Section 4980B(f) of the
Code, no Plan promises or provides post-retirement medical, life insurance or
other benefits due now or in the future to current, former or retired employees
of the Company.

               (l)     All Welfare Plans and the related trusts that are
subject to Section 4980B(f) of the Code and Sections 601 through 607 of ERISA
comply with and have been administered in compliance with the health care
continuation-

                                     - 21 -
<PAGE>   26

coverage requirements for tax-favored status under Section 4980B(f) of the Code
(formerly Section 162(k) of the Code), Sections 601 through 607 of ERISA, and
all proposed or final Treasury regulations under Section 162 of the Code
explaining those requirements.

               (m)     The Company has (i) filed or caused to be filed all
returns and reports on the Plans that they are required to file and (ii) paid or
made adequate provision for all fees, interest, penalties, assessments or
deficiencies that have become due pursuant to those returns or reports or
pursuant to any assessment or adjustment that has been made relating to those
returns or reports. All other fees, interest, penalties and assessments that are
payable by or for the Company have been timely reported, fully paid and
discharged. There are no unpaid fees, penalties, interest or assessments due
from the Company or from any other person that are or could become a lien on any
Asset of the Company or could otherwise adversely affect the business or Assets
of the Company. The Company has collected or withheld all amounts that are
required to be collected or withheld by them to discharge their obligations, and
all of those amounts have been paid to the appropriate governmental agencies or
set aside in appropriate accounts for future payment when due.

        4.22   ENVIRONMENTAL

               (a)     The Company has complied and is in compliance with, and
the Company's use of the Real Property and all improvements thereon are in
compliance with, all Environmental Laws, except for any noncompliance which has
not had, and would not reasonably be expected to have, a Material Adverse
Effect.

               (b)     There are no pending or, to the Company's or the
Stockholders' knowledge, threatened actions, suits, claims, legal proceedings or
other proceedings based on, and neither the Company nor the Stockholders has
directly or indirectly received any notice of any complaint, order, directive,
citation, notice of responsibility, notice of potential responsibility, or
information request from any governmental authority or any other person or
entity or knows any fact(s) which the Company or the Stockholders reasonably
believes form(s) the basis for any such actions or notices arising out of or
attributable to: (i) the current or past presence, Release or threatened Release
at or from any part of the Real Property related to the Company's operations;
(ii) the off-site disposal or treatment of Hazardous Materials originating on or
from the Real Property with respect to the business or Assets of the Company;
(iii) any facility operations, procedures or designs of the Company which do not
conform to requirements of the Environmental Laws; or (iv) any violation of
Environmental Laws at any part of the Real Property or arising from the
Company's activities (or, to the knowledge of the Company and the

                                     - 22 -
<PAGE>   27

Stockholders, the activities of the Company's predecessors in title) involving
Hazardous Materials.

               (c)     The Company has been duly issued, and currently has and
will maintain through the Closing Date, all permits, licenses, certificates and
approvals required to be obtained by the Company under any Environmental Law. A
true and complete list of such permits, licenses, certificates and approvals,
all of which are valid and in full force and effect, is set out in the
Disclosure Schedule. Except in accordance with such permits, licenses,
certificates and approvals, there has been no release of material regulated by
such permits, licenses, certificates or approvals.

               (d)     To the knowledge of the Company and the Stockholders,
the Real Property contains no underground treatment or storage tanks, or
underground piping associated with such tanks, used currently or in the past for
the management of Hazardous Materials. No portion of the Real Property is being
or, to the knowledge of the Company and the Stockholders, has been, used as a
dump or landfill, or consists of or contains filled in lands or wetlands.

               (e)     The Company has furnished to Buyer accurate and complete
copies of any environmental reports, assessments or other records, if any,
relating to the environmental condition of the Real Property of which the
Company or the Stockholders is in possession.

               (f)     The Company will promptly furnish to Buyer written
notice of any Release or of any actions or notices described in Section 4.22(b).

               (g)     To the knowledge of the Company and the Stockholders,
neither PCBs nor asbestos-containing materials are present on or in the Real
Property.

        4.23   TRANSACTIONS WITH RELATED PARTIES

               Except as set forth in the Disclosure Schedule, neither any
present or former officer, director, stockholder or person known by the Company
or the Stockholders to be an Affiliate of the Company, nor any person known by
the Company or the Stockholders to be an Affiliate of any such person, is
currently a party to any transaction or Agreement with the Company, including,
without limitation, any Agreement providing for the employment of, furnishing of
services by, rental of Assets from or to, or otherwise requiring payments to,
any such officer, director, stockholder or Affiliate.

                                     - 23 -
<PAGE>   28

        4.24   RESTRICTIONS AND CONSENTS

               Except as set forth in the Disclosure Schedule, there are no
Agreements, Laws or other restrictions to which the Company is a party or
subject that would prevent or restrict the execution, delivery or performance of
this Purchase Agreement by the Company or result in any penalty, forfeiture,
Agreement termination, or restriction on business operations of the Company as a
result of the execution, delivery or performance of this Purchase Agreement by
the Company. The Disclosure Schedule lists all such Agreements and Laws that
require the consent or acquiescence of any person or entity not party to this
Purchase Agreement with respect to any aspect of the execution, delivery or
performance of this Purchase Agreement by the Company.

        4.25   AUTHORIZATION

               Except as set forth in the Disclosure Schedule, the execution,
delivery and performance by the Company of this Purchase Agreement and all other
Documents executed by the Company in connection with the transactions
contemplated hereby, the fulfillment of and compliance with the respective terms
and provisions hereof, and the consummation by the Company of the transactions
contemplated hereby, have been duly authorized by all necessary corporate action
(which authorization has not been modified or rescinded and is in full force and
effect), and do not and will not: (a) conflict with, or violate any provision
of, any Law having applicability to the Company, or any provision of the
certificate of incorporation or bylaws of the Company; (b) conflict with, or
result in any breach of, or constitute a default under any Agreement to which
the Company is a party or by which it or any of its Assets may be bound; or (c)
result in or require the creation or imposition of or result in the acceleration
of any indebtedness, or of any Encumbrance of any nature upon, or with respect
to, the Company or any of the Assets now owned or hereafter acquired by the
Company.

        4.26   ABSENCE OF VIOLATION

               The Company is not in violation of or default under, nor has it
breached, any term or provision of its certificate of incorporation or bylaws or
any Agreement to which the Company is a party or by which the Company or any
Asset thereof is bound or affected, except for any violations, breaches or
defaults under Agreements which do not, individually or in the aggregate with
any other such violations, breaches and defaults, have a Material Adverse
Effect. The Company has complied and is in compliance with all Laws, the failure
to comply with which could have a Material Adverse Effect. Neither the Company
nor any of its officers or directors, any employees or, to the knowledge of the
Company and the Stockholders, any of the Company's agents (or the stockholders,
distributors,

                                     - 24 -
<PAGE>   29

representatives or other persons acting on the express authority of the Company)
has paid, given or received or has offered or promised to pay, give or receive,
any bribe or other unlawful, questionable or unusual payment of money or other
thing of value, any extraordinary discount, or any other unlawful or unusual
inducement, to or from any person, business association or governmental official
or entity in the United States or elsewhere in connection with or in furtherance
of the business of the Company (including, without limitation, any offer,
payment or promise to pay money or other thing of value (a) to any foreign
official or political party (or official thereof) for the purposes of
influencing any act, decision or omission in order to assist the Company in
obtaining business for or with, or directing business to, any person, or (b) to
any person, while knowing that all or a portion of such money or other thing of
value will be offered, given or promised to any such official or party for such
purposes). The business of the Company is not in any manner dependent upon the
making or receipt of such payments, discounts or other inducements.

        4.27   COPIES OF DOCUMENTS

               True and complete copies of all Documents listed in the
Disclosure Schedule have been furnished to Buyer prior to the execution of this
Purchase Agreement.

        4.28   BINDING OBLIGATION

               This Purchase Agreement constitutes, and each Document to be
executed by the Company pursuant hereto, when executed and delivered in
accordance with the provisions hereof, shall constitute, a valid and binding
obligation of the Company, enforceable in accordance with its terms, except as
such enforceability may be limited by bankruptcy, insolvency, reorganization,
moratorium and other similar laws of general applicability relating to or
affecting creditors' rights generally and by the application of general
principles of equity.

        4.29   DISCLOSURE

               No representation or warranty by the Company or the Stockholders
in this Purchase Agreement, and no certificate expressly referred to in this
Purchase Agreement as being furnished or to be furnished by the Company or the
Stockholders to Buyer pursuant to this Purchase Agreement, or in connection
herewith or with the transactions contemplated hereby, contains or will contain
any material untrue or misleading statement or omits or will omit any material
fact necessary to make the statements contained herein or therein, in light of
the circumstances under which made, not misleading.

                                     - 25 -
<PAGE>   30

5.      REPRESENTATIONS AND WARRANTIES OF THE STOCKHOLDERS

               In addition to the representations and warranties made by the
Stockholders in Section 4 hereof, each Stockholder, severally with respect to
such Stockholder and not jointly with the other Stockholders, hereby represents
and warrants to Buyer as follows:

        5.01   TITLE TO CAPITAL STOCK

               Such Stockholder is and on the Closing Date will be, the sole
legal, beneficial and record owner of all of the issued and outstanding shares
of capital stock of the Company set forth next to such Stockholder's name on
Exhibit A hereto, with good, valid and marketable title thereto, free and clear
of all Encumbrances, except such restrictions on the transfer of such shares as
may be applicable under federal and state securities laws, with full right and
lawful authority to sell and transfer the shares to Buyer pursuant to this
Purchase Agreement.

        5.02   AUTHORITY AND CAPACITY

               Such Stockholder has full legal right, capacity, power and
authority to execute and deliver this Purchase Agreement and all other Documents
executed or to be executed by such Stockholder pursuant hereto, and to
consummate the transactions contemplated hereby and thereby.

        5.03   ABSENCE OF VIOLATION

               The execution, delivery and performance by such Stockholder of
this Purchase Agreement and all other Documents contemplated hereby to which
such Stockholder is a party, the fulfillment of and the compliance with the
respective terms and provisions hereof and thereof, and the consummation of the
transactions contemplated hereby and thereby, do not and will not (a) conflict
with, or violate any provision of, any Laws having applicability to such
Stockholder; or (b) conflict with, or result in any breach of, or constitute a
default under, any Agreement to which such Stockholder is a party.

        5.04   RESTRICTIONS AND CONSENTS

               There are no Agreements, Laws or other restrictions of any kind
to which such Stockholder is a party or subject that would prevent or restrict
the execution, delivery or performance of this Purchase Agreement by such
Stockholder.

                                     - 26 -
<PAGE>   31

        5.05   BINDING OBLIGATION

               This Purchase Agreement constitutes, and each Document to be
executed by such Stockholder pursuant hereto, when executed and delivered in
accordance with the provisions hereof, shall constitute, a valid and binding
obligation of such Stockholder, enforceable in accordance with its terms, except
as such enforceability may be limited by bankruptcy, insolvency, reorganization,
moratorium and other similar laws of general applicability relating to or
affecting creditors' rights generally and by the application of general
principles of equity.

        5.06   TRANSFER OF TITLE

               Upon payment at Closing for the Shares to be purchased from such
Stockholder pursuant to the terms of this Purchase Agreement, Buyer will acquire
good, valid and marketable title thereto, free and clear of all Encumbrances,
except such restrictions on the transfer of such shares as may be applicable
under federal and state securities laws.

6.      REPRESENTATIONS AND WARRANTIES OF BUYER

               Buyer hereby represents and warrants to the Company and the
Stockholders as follows:

        6.01   ORGANIZATION AND STANDING

               Buyer is a corporation duly organized, validly existing and in
good standing under the laws of the Commonwealth of Virginia and has the
corporate power and authority to enter into this Purchase Agreement and to carry
out the transactions contemplated hereby.

        6.02   AUTHORIZATION

               The execution, delivery and performance by Buyer of this Purchase
Agreement and all other Documents executed or to be executed by Buyer in
connection with the transactions contemplated hereby, the fulfillment of and the
compliance with the respective terms and provisions hereof and thereof, and the
consummation by Buyer of the transactions contemplated hereby and thereby have
been duly authorized by all necessary corporate action (which authorization has
not been modified or rescinded and is in full force and effect), and do not and
will not: (a) conflict with, or violate any provision of, any Law having
applicability to Buyer or any provision of the articles of incorporation or
bylaws of Buyer; (b) conflict with, or result in any breach of, or constitute a
default under, any Agreement to which

                                     - 27 -
<PAGE>   32

Buyer is a party or by which Buyer is bound; or (c) result in or require the
creation or imposition of or result in the acceleration of any indebtedness, or
of any Encumbrance of any nature upon, or with respect to, Buyer or any of the
Assets now owned or hereafter acquired by Buyer. No other corporate action is
necessary for Buyer to enter into this Purchase Agreement and all other
Documents contemplated hereby and to consummate the transactions contemplated
hereby and thereby.

        6.03   BINDING OBLIGATION

               This Purchase Agreement constitutes, and each Document to be
executed by Buyer pursuant hereto, when executed and delivered in accordance
with the provisions hereof, shall constitute, a valid and binding obligation of
Buyer, enforceable in accordance with its terms, except as such enforceability
may be limited by bankruptcy, insolvency, reorganization, moratorium and other
similar laws of general applicability relating to or affecting creditors' rights
generally and by the application of general principles of equity.

        6.04   NO REGISTRATION UNDER THE SECURITIES ACT

               Buyer understands that the capital stock to be purchased by it
under this Purchase Agreement has not been registered under the Securities Act
or any state securities laws, in reliance upon exemptions contained in the
Securities Act and such state securities laws or interpretations thereof, and
cannot be offered for sale, sold or otherwise transferred unless such capital
stock being acquired hereunder subsequently is so registered or qualifies for
exemption from registration under the Securities Act and such state securities
laws.

        6.05   ACQUISITION FOR INVESTMENT

               The capital stock is being acquired under this Purchase Agreement
by Buyer in good faith solely for its own account, for investment and not with a
view toward resale or other distribution within the meaning of the Securities
Act. Such capital stock will not be offered for sale, sold or otherwise
transferred by Buyer without either registration or exemption from registration
under the Securities Act and applicable state securities laws.

        6.06   EVALUATION OF MERITS AND RISKS OF INVESTMENT

               Buyer has such knowledge and experience in financial and business
matters that Buyer is capable of evaluating the merits and risks of Buyer's
investment in such capital stock being acquired hereunder. Buyer understands and
is able to bear any economic risks associated with such investment (including,
without limitation, the necessity of holding such capital stock for an
indefinite

                                     - 28 -
<PAGE>   33

period of time, inasmuch as such capital stock has not been registered under the
Securities Act or any state securities laws).

        6.07   DISCLOSURE

               No representation or warranty by Buyer in this Purchase Agreement
contains any material untrue or misleading statement or omits any material fact
necessary to make the statements contained herein in light of the circumstances
under which made, not misleading.

7.      CONDITIONS PRECEDENT TO OBLIGATIONS OF THE COMPANY AND THE STOCKHOLDERS

               The obligations of the Company and the Stockholders under this
Purchase Agreement are subject to the fulfillment, at or prior to the Closing,
of each of the following conditions, and failure to satisfy any such condition
shall excuse and discharge all obligations of the Company and the Stockholders
to carry out the provisions of this Purchase Agreement, unless such failure is
agreed to in writing by the Company and the Stockholders:

        7.01   REPRESENTATIONS AND WARRANTIES

               The representations and warranties made by Buyer in this Purchase
Agreement or in any Document furnished by Buyer pursuant to this Purchase
Agreement shall be true and correct in all material respects when made and on
and as of the Closing Date as though such representations and warranties were
made on and as of the Closing Date (provided that any representation or warranty
contained herein that is qualified by a materiality standard shall not be
further qualified hereby).

        7.02   PERFORMANCE

               Buyer shall have performed and complied in all material respects
with all Agreements and conditions required by this Purchase Agreement to be
performed or complied with by Buyer prior to the Closing Date.

        7.03   BUYER'S CERTIFICATE

               Buyer shall have delivered to the Company and the Stockholders a
certificate, dated as of the Closing Date and executed by a senior officer of
Buyer, certifying to the fulfillment of the conditions set forth in Section 7.01
and Section 7.02.

                                     - 29 -
<PAGE>   34

        7.04   DOCUMENTS AT CLOSING

               All Documents required to be furnished by Buyer to the Company
and/or the Stockholders prior to or at the Closing shall have been so furnished.

        7.05   CONSULTING AGREEMENT

               Buyer shall have executed and delivered to Reynaldo P. Maduro,
Sr. a consulting agreement substantially in the form of Exhibit E hereto.

        7.06   LEGAL OPINION

               The Company and the Stockholders shall have received an opinion
from Hogan & Hartson L.L.P., counsel to Buyer, in the form attached hereto as
Exhibit H.

8.      CONDITIONS PRECEDENT TO OBLIGATIONS OF BUYER

        The obligations of Buyer under this Purchase Agreement are subject to
the fulfillment, at or prior to the Closing, of each of the following
conditions, and failure to satisfy any such condition shall excuse and discharge
all obligations of Buyer to carry out the provisions of this Agreement, unless
such failure is agreed to in writing by Buyer:

        8.01   REPRESENTATIONS AND WARRANTIES

               The representations and warranties made (jointly or individually)
by the Company and the Stockholders in this Purchase Agreement and the
statements contained in the Disclosure Schedule and Exhibits attached hereto or
in any Document furnished by the Company or the Stockholders pursuant to this
Purchase Agreement shall be true and correct in all material respects when made,
and on and as of the Closing Date as though such representations and warranties
were made on and as of the Closing Date (provided that any representation or
warranty contained herein that is qualified by a materiality standard shall not
be further qualified hereby).

        8.02   PERFORMANCE

               The Company and the Stockholders shall have performed and
complied in all material respects with all Agreements and conditions required by
this Purchase Agreement to be performed or complied with prior to the Closing
Date.

                                     - 30 -
<PAGE>   35

Neither the Credit Agreement nor the loans made to the Company thereunder shall
have been amended or otherwise modified in any respect.

        8.03   ABSENCE OF ADVERSE CHANGES

               There shall have been no material adverse changes since the
Balance Sheet Date in the business, operations, condition (financial or
otherwise), Assets or liabilities of the Company.

        8.04   LEGAL PROCEEDINGS

               No action or proceeding by or before any governmental authority
shall have been instituted or threatened (and not subsequently settled,
dismissed or otherwise terminated) which is reasonably expected to restrain,
prohibit or invalidate the transactions contemplated by this Purchase Agreement.

        8.05   OFFICER'S CERTIFICATE

               The Company shall have delivered to Buyer a certificate, dated as
of the Closing Date and executed by the Company's President, in his capacity as
such, certifying to the fulfillment of the conditions specified in Sections 8.01
through 8.04.

        8.06   STOCKHOLDERS' CERTIFICATE

               The Stockholders shall have delivered to Buyer a certificate,
dated as of the Closing Date and executed by the Stockholders, certifying to the
fulfillment of the conditions specified in Sections 8.01 through 8.04.

        8.07   SUBORDINATION AGREEMENT

               The Stockholders shall have executed and delivered to Buyer the
Subordination Agreement and such other agreements, documents and certificates
reasonably requested by Buyer's senior lender pursuant to the Subordination
Agreement to evidence the subordination of the Promissory Notes.

        8.08   DOCUMENTS AT CLOSING

               All Documents required to be furnished by the Company and/or the
Stockholders to Buyer prior to or at the Closing shall have been so furnished.

                                     - 31 -
<PAGE>   36

        8.09   CONSENTS

               All consents, authorizations, approvals and notifications
required to be obtained or made by the Company or the Stockholders in connection
with the consummation of the transactions contemplated by this Purchase
Agreement shall have been duly obtained or made and shall be in full force and
effect as of the Closing Date; provided, however, that none of the consents set
forth on Schedule 4.24 of the Disclosure Schedule is required to be obtained as
a condition to Buyer's obligation under this Purchase Agreement.

        8.10   RESIGNATION OF DIRECTORS

               Buyer shall have received the written resignations of all of the
members of the Board of Directors of the Company (effective as of the Closing
Date).

        8.11   CONSULTING AGREEMENT

               Reynaldo P. Maduro, Sr. shall have executed and delivered to
Buyer a consulting agreement substantially in the form of Exhibit E hereto.

        8.12   LEGAL OPINION

               Buyer shall have received an opinion from Winston & Strawn,
counsel to the Company and the Stockholders, in the form attached hereto as
Exhibit F.

        8.13   MINIMUM NET ASSETS

               The Company shall have delivered to Buyer (a) a balance sheet
dated as of a date not more than seventeen (17) days prior to the Closing Date,
certified by the chief financial officer of the Company, showing that the net
assets of the Company (as determined in accordance with generally accepted
accounting principles and in a manner consistent with the determination of net
assets on the Company's December 22, 2000, balance sheet) are not less than
Three Million Seven Hundred Fifty Thousand Dollars ($3,750,000) as of such date;
and (b) a balance sheet dated as of March 16, 2001 (the "Closing Balance Sheet")
which shall include an accrual for unpaid Transaction Expenses of the Company
and the Stockholders through the Closing Date, which accrual would not typically
be included on the Closing Balance Sheet under generally accepted accounting
principles. The net assets reflected on the Closing Balance Sheet (taking into
account the accrual for Transaction Expenses) shall not be less than Three
Million Seven Hundred Fifty Thousand Dollars ($3,750,000) as of such date.

                                     - 32 -
<PAGE>   37

        8.14   NONCOMPETITION AGREEMENTS

               Each Stockholder shall have executed and delivered to Buyer a
noncompetition agreement substantially in the form of the noncompetition
agreement for such Stockholder attached at Exhibit G hereto.

        8.15   TERMINATION OF STOCKHOLDERS' AGREEMENT

               The Company and the Stockholders shall have executed a
termination agreement in a form reasonably acceptable to Buyer terminating the
Amended and Restated Stockholders' Agreement dated as of December 28, 1999, by
and among the Company and the Stockholders.

9.      CLOSING

        9.01   CLOSING OF SALE AND PURCHASE

               Subject to the terms and conditions of this Purchase Agreement,
the Closing shall take place on the Closing Date at the offices of Hogan &
Hartson L.L.P., 8300 Greensboro Drive, Suite 1100, McLean, Virginia 22102, or at
such other place acceptable to Buyer, the Company and the Stockholders.

        9.02   DELIVERIES BY THE STOCKHOLDERS

               At the Closing, the Stockholders shall deliver to Buyer
certificates representing the shares of capital stock being sold to Buyer
pursuant to Section 2.01, duly endorsed in blank or with duly executed stock
powers attached. The Stockholders also shall deliver to Buyer the following:

               (a)     the certificate required by Section 8.06; and

               (b)     the Subordination Agreement.

        9.03   DELIVERIES BY THE COMPANY

               At the Closing, the Company shall deliver to Buyer the following:

               (a)     a copy of the resolutions adopted by the Board of
Directors of the Company authorizing the transactions contemplated by this
Purchase Agreement certified by the Secretary or other duly authorized officer
of the Company;

                                     - 33 -
<PAGE>   38

               (b)     the written resignations of all of the current members of
the Board of Directors of the Company (effective as of the Closing Date);

               (c)     the certificate required by Section 8.05;

               (d)     certificates of incumbency and specimen signatures of the
signatory officers of the Company;

               (e)     a certificate of good standing of the Company issued by
the state of Delaware, and a good standing certificate from each state in which
the Company is qualified to do business, each such certificate to be dated as of
a date not more than seven (7) days prior to the Closing Date;

               (f)     the certificate of incorporation, bylaws, minute books
and stock books of the Company and all other books and records reasonably
requested by Buyer;

               (g)     the Consulting Agreement described in Section 8.11 duly
executed by Reynaldo P. Maduro, Sr.;

               (h)     the legal opinion described in Section 8.12;

               (i)     a payoff letter executed by First Virginia Bank, in a
form reasonably acceptable to Buyer, which specifies separately the amount of
all outstanding indebtedness of the Company and the Stockholders to such bank as
of the Closing Date, and includes an obligation of such bank to execute all
release documents necessary to terminate and release the Encumbrances securing
the loans made pursuant to the Credit Agreement; and

               (j)     the noncompetition agreements described in Section 8.14
duly executed by each Stockholder.

        9.04   DELIVERIES BY BUYER

               At the Closing, Buyer shall deliver the following:

               (a)     the Promissory Note to each Stockholder;

               (b)     a certified copy of the resolutions adopted by the Board
of Directors of Buyer authorizing the transactions contemplated by this Purchase
Agreement;

               (c)     the certificate required by Section 7.03;

                                     - 34 -
<PAGE>   39

               (d)     the Consulting Agreement described in Section 7.05 duly
executed by Buyer;

               (e)     the Subordination Agreement;

               (f)     the noncompetition agreements described in Section 8.14
each duly executed by Buyer; and

               (g)     the legal opinion described in Section 7.06.

10.     SURVIVAL OF REPRESENTATIONS; INDEMNIFICATION; REMEDIES

        10.01  SURVIVAL OF REPRESENTATIONS

               All representations, warranties, covenants, indemnities and other
Agreements made by any party to this Purchase Agreement herein or pursuant
hereto, or made pursuant to any Disclosure Schedule, shall be deemed made on and
as of the Closing Date as though such representations, warranties, covenants,
indemnities and other Agreements were made on and as of such date, and all such
representations, warranties, covenants, indemnities and other Agreements shall
survive the Closing and any investigation, audit or inspection at any time made
by or on behalf of any party hereto, as follows: (a) unless otherwise specified
herein below, representations and warranties shall survive for a period of
eighteen (18) months after the Closing Date; (b) representations and warranties
with respect to Taxes shall survive until the expiration of the applicable
statute of limitations; (c) representations, warranties and covenants for
matters relating to title to the capital stock of the Company shall continue in
full force and effect in perpetuity; (d) representations, warranties and
covenants for matters relating to title to the Company's Assets shall continue
in full force and effect for a period of two (2) years after the Closing Date;
and (e) the covenants and agreements in this Article 10 and the covenants and
agreements which by their terms survive Closing shall continue in full force and
effect until fully discharged. Notwithstanding anything herein to the contrary,
any representation, warranty, covenant or Agreement which is the subject of a
claim which is asserted in writing prior to the expiration of the applicable
period set forth above shall survive with respect to such claim or dispute until
the final resolution thereof.

                                     - 35 -
<PAGE>   40

        10.02  AGREEMENT OF STOCKHOLDERS TO INDEMNIFY

               Subject to the conditions and provisions of this Article 10, the
Stockholders hereby jointly and severally agree to indemnify, defend and hold
harmless the Buyer Indemnified Persons from and against and in respect of all
Losses resulting from, imposed upon or incurred by the Buyer Indemnified
Persons, directly or indirectly, by reason of or resulting from (a) any
misrepresentation or breach of any representation or warranty, or noncompliance
with any conditions or other Agreements, given or made by the Stockholders or
the Company in this Purchase Agreement or in the Disclosure Schedules or
Exhibits attached hereto or in any Document furnished by or on behalf of any
such party pursuant to this Purchase Agreement; (b) any arrangements between the
Company and/or the Stockholders and any broker, finder, agent or similar advisor
in connection with the transactions contemplated by the Purchase Agreement, and
any claim for fees or other amounts arising out of any such arrangement or
alleged arrangement; and (c) any claims made under any Agreements or
arrangements between the Stockholders and/or the Company and any former officer,
director or stockholder of the Company that were entered into prior to the
Closing Date; provided, however, that, except for Losses arising out of a
willful or intentional breach of representations, warranties or covenants by the
Company or the Stockholders, Losses arising out of any breach of representations
or warranties for matters relating to title to the capital stock of the Company,
the obligations of the Stockholders and the Company under Article 11 and the
obligations of the Stockholders under Section 13.03 hereof, none of which shall
be subject to the following limitations, the Stockholders shall not have any
liability under Section 10.02(a) except to the extent that the aggregate amount
of claims for Losses asserted under such Section exceeds One Hundred Thousand
Dollars ($100,000); provided, further, however, in no event shall the aggregate
amount of liability of the Stockholders for Losses asserted under Section
10.02(a) (except for Losses arising out of a willful or intentional breach of
representations, warranties or covenants by the Company or the Stockholders,
Losses arising out of any breach of representations or warranties for matters
relating to title to the capital stock of the Company, the obligations of the
Stockholders and the Company under Article 11 and the obligations of the
Stockholders under Section 13.03 hereof), exceed Two Million Dollars
($2,000,000). It shall be a condition to the right of any Buyer Indemnified
Person to indemnification pursuant to this Section that such Buyer Indemnified
Person shall assert a claim for such indemnification within the applicable
survival periods set forth in Section 10.01 hereof.

        10.03  AGREEMENT OF BUYER TO INDEMNIFY

        Subject to the conditions and provisions of this Article 10, Buyer
hereby agrees to indemnify, defend and hold harmless the Stockholders from and
against

                                     - 36 -
<PAGE>   41

and in respect of all Losses resulting from, imposed upon or incurred by the
Stockholders, directly or indirectly, by reason of or resulting from any
misrepresentation or breach of any representation or warranty, or noncompliance
with any conditions or other Agreements, given or made by Buyer in this Purchase
Agreement or in the Exhibits or in any Document furnished by or on behalf of
Buyer pursuant to this Purchase Agreement; provided, however, that, except for
Losses arising out of a willful or intentional breach of representations,
warranties or covenants by Buyer and the obligations of Buyer under Article 11
hereof, none of which shall be subject to the following limitations, Buyer shall
have no liability under this Section 10.03 until the aggregate amount of claims
for Losses asserted under such Section exceeds One Hundred Thousand Dollars
($100,000); provided, further, however, in no event shall the aggregate amount
of liability of Buyer for Losses asserted under this Section 10.03 (except for
Losses arising out of a willful or intentional breach of representations,
warranties or covenants by Buyer and the obligations of Buyer under Article 11
hereof), exceed Two Million Dollars ($2,000,000). It shall be a condition to the
rights of the Stockholders to indemnification pursuant to this Section that such
parties shall assert a claim for such indemnification within the applicable
survival periods set forth in Section 10.01 hereof.

        10.04  CONDITIONS OF INDEMNIFICATION

               The obligations and liabilities of the Company, the Stockholders
and Buyer hereunder with respect to their respective indemnities pursuant to
this Article 10, resulting from any Third Party Claim shall be subject to the
following terms and conditions:

               (a)     The party seeking indemnification (the "Indemnified
Party") must give the other party (the "Indemnifying Party"), notice of any
Third Party Claim which is asserted against, resulting to, imposed upon or
incurred by the Indemnified Party and which may give rise to liability of the
Indemnifying Party pursuant to this Article 10, stating (to the extent known or
reasonably anticipated) the nature and basis of such Third Party Claim and the
amount thereof; provided that the failure to give such notice shall not affect
the rights of the Indemnified Party hereunder except to the extent that the
Indemnifying Party shall have suffered actual material damage by reason of such
failure.

               (b)     Subject to Section 10.04(c) below, the Indemnifying
Party shall have the right to undertake, by counsel or other representatives of
its own choosing, the defense of such Third Party Claim at the Indemnifying
Party's risk and expense.

                                     - 37 -
<PAGE>   42

               (c)     In the event that (i) the Indemnifying Party shall elect
not to undertake such defense, (ii) within a reasonable time after notice from
the Indemnified Party of any such Third Party Claim, the Indemnifying Party
shall fail to undertake to defend such Third Party Claim, (iii) there is a
reasonable probability that such Third Party Claim may materially and adversely
affect the Indemnified Party other than as a result of money damages or other
money payments, or (iv) there is a reasonable probability that the amount of
Losses asserted under such Third Party Claim may exceed the Indemnifying Party's
obligations under this Article 10, then the Indemnified Party (upon further
written notice to the Indemnifying Party) shall have the right to undertake the
defense, compromise or settlement of such Third Party Claim, by counsel or other
representatives of its own choosing, on behalf of and for the account and risk
of the Indemnifying Party; provided, however, that if the Indemnified Party
undertakes defense of such Third Party Claim under clause (iv) above, the
Indemnified Party shall not, without the Indemnifying Party's written consent
(which consent shall not be unreasonably withheld), settle such Third Party
Claim if the Indemnifying Party will be responsible for any amounts under such
settlement. In the event that the Indemnified Party undertakes the defense of a
Third Party Claim under this Section 10.04(c), the Indemnifying Party shall pay
to the Indemnified Party, in addition to the other sums required to be paid
hereunder, the reasonable costs and expenses incurred by the Indemnified Party
in connection with such defense, compromise or settlement as and when such costs
and expenses are so incurred.

               (d)     Anything in this Section 10.04 to the contrary
notwithstanding, (i) the Indemnifying Party shall not, without the Indemnified
Party's written consent, settle or compromise such Third Party Claim or consent
to entry of any judgment which does not include as an unconditional term thereof
the giving by the claimant or the plaintiff to the Indemnified Party of a
release from all liability in respect of such Third Party Claim in form and
substance satisfactory to the Indemnified Party; (ii) in the event that the
Indemnifying Party undertakes defense of such Third Party Claim, the Indemnified
Party, by counsel or other representative of its own choosing and at its sole
cost and expense, shall have the right to participate in the defense, compromise
or settlement thereof and each party and its counsel and other representatives
shall cooperate with the other party and its counsel and representatives in
connection therewith; and (iii) in the event that the Indemnifying Party
undertakes defense of such Third Party Claim, the Indemnifying Party shall have
an obligation to keep the Indemnified Party informed of the status of the
defense of such Third Party Claim and furnish the Indemnified Party with all
documents, instruments and information that the Indemnified party shall
reasonably request in connection therewith.

                                     - 38 -
<PAGE>   43

        10.05  NO RECOURSE AGAINST THE COMPANY

               The Stockholders hereby irrevocably waive any and all right to
recourse against the Company with respect to any misrepresentation or breach of
any representation, warranty or indemnity, or noncompliance with any conditions
or covenants, given or made by the Stockholders or the Company in this Purchase
Agreement. The Stockholders shall not be entitled to contribution from,
subrogation to or recovery against the Company with respect to any liability of
the Stockholders that may arise under or pursuant to this Purchase Agreement or
the transactions contemplated hereby.

        10.06  SPECIFIC PERFORMANCE

               In addition to any other remedies which Buyer may have at law or
in equity, the Company and the Stockholders hereby acknowledge that the Company
and its capital stock are unique, and that the harm to Buyer resulting from
breaches by the Company and the Stockholders of their respective obligations
cannot be adequately compensated by damages. Accordingly, the Company and the
Stockholders agree that Buyer shall have the right to have all obligations,
undertakings, Agreements, covenants and other provisions of this Purchase
Agreement specifically performed by the Company and the Stockholders, as the
case may be, and that Buyer shall have the right to obtain an order or decree of
such specific performance in any of the courts of the United States of America
or of any state or other political subdivision thereof.

        10.07  REMEDIES CUMULATIVE

               The remedies provided herein shall be cumulative and shall not
preclude the assertion by the Company, the Stockholders or Buyer of any other
rights or the seeking of any other remedies against the other, or their
respective successors or assigns.

11.     TAX MATTERS

        11.01  SECTION 338(h)(10) ELECTION

               At Buyer's request, the Stockholders shall join with Buyer in
making an election under Section 338(h)(10) of the Code (any corresponding
election under state, local or foreign tax law) with respect to the purchase and
sale of stock of the Company (the "Section 338(h)(10) Election") in form and
substance satisfactory to the Buyer. Buyer shall be responsible for the filing
of any Form 8023 or analogous, ancillary or supporting forms, documents and
statements under state, local or

                                     - 39 -
<PAGE>   44

foreign law to make the Section 338(h)(10) Elections (the "Section 338 Forms").
The Stockholders will include any income, gain loss, deduction, or other tax
item resulting from the Section 338(h)(10) Election on their Tax Returns to the
extent required by applicable Laws. The Stockholders shall also pay any Tax
liability imposed on the Company attributable to or in any way arising from the
making of the Section 338(h)(10) Election, including, but not limited to, (a)
any Tax imposed under Code Section 1374, (b) any Tax imposed under Reg. Section
1.338(h)(10)-1(e)(5), or (c) any state, local or foreign Tax imposed on the
Company's gain, and the Stockholders shall jointly and severally indemnify Buyer
and the Company against any Losses arising out of any failure to pay the Taxes
attributable to the Company.

        11.02  ALLOCATION OF PURCHASE PRICE

               Buyer, the Company and each of the Stockholders agree that the
Purchase Price and the liabilities of the Company (plus other relevant items)
will be allocated to the Assets of the Company for all purposes (including Tax
and financial accounting) in accordance with their fair market values as
reasonably determined by Buyer in accordance with the applicable rules of
Section 338 of the Code and the regulations thereunder and consented to by the
Stockholders (which consent shall not be unreasonably withheld), which
allocation shall be binding upon the parties. Within ninety (90) days following
the Closing, Buyer and the Company shall agree on a list of assets to which the
"Aggregate Deemed Sales Price" (as defined under applicable Treasury
Regulations) of the assets of the Company shall be allocated. All allocations
contained in such schedule shall be used by each party in preparing the Section
338 Forms and all relevant Tax Returns (including amended returns and claims for
refund), subject to adjustment to reflect (a) Stockholders' selling expenses as
a reduction of sales proceeds, and (b) Buyer's acquisition expenses as an
addition to the Purchase Price.

        11.03  S CORPORATION STATUS

               Prior to Closing, neither the Company nor any Stockholder shall
revoke the Company's election to be taxed as an S corporation within the meaning
of Sections 1361 and 1362 of the Code. Prior to Closing, neither the Company nor
any Stockholder shall knowingly take or allow any action (other than the sale of
the Company's stock pursuant to this Purchase Agreement) that would result in
the termination of the Company's status as a validly electing S corporation
within the meaning of Sections 1361 and 1362 of the Code. After the Closing,
neither Buyer, the Company, nor any Stockholder shall take any position
inconsistent with the Company being an S corporation for all periods through the
Closing Date.

                                     - 40 -
<PAGE>   45

        11.04  TAX RETURNS AND PAYMENTS

               The Stockholders shall prepare or cause to be prepared and Buyer
shall timely file or cause to be filed all Tax Returns for the Company for all
Tax periods ending on or prior to the Closing Date ("Pre-Closing Periods") which
are due after the Closing Date. Such Returns shall be prepared in a manner
consistent with the Company's prior practice and the allocation of the Purchase
Price pursuant to Section 11.02. At least fifteen (15) days prior to the filing
of each such Return, the Stockholders shall provide the Return to Buyer for its
review and comment and the Stockholders shall make such revisions to such Return
as are necessary to conform the Return with the preceding sentence or to be
consistent with applicable Law and shall provide the Return, as revised, to
Buyer for filing. Buyer shall prepare or cause to be prepared and Buyer shall
timely file or cause to be filed any Tax Returns of the Company for Tax periods
which begin before the Closing Date and end after the Closing Date (the
"Straddle Periods"). Such Returns shall be prepared in a manner consistent with
the Company's prior practice to the extent consistent with applicable Laws. At
least fifteen (15) days prior to the filing of each such Return with respect to
Straddle Periods, Buyer shall provide copies of such Return to the Stockholders
for the Stockholders' review and comment and Buyer shall make such revisions to
such Tax Returns as are reasonably requested by the Stockholders. The
Stockholders shall pay to Buyer within fifteen (15) days after the date on which
Taxes are paid (a) in the case of each Return filed by Buyer relating to a
Pre-Closing Period the amount of Tax paid with respect to such period as show on
the Return in excess of (i) the reserve for such Tax liability (rather than any
reserve for deferred Taxes established to reflect timing differences between
book and Tax income) as shown on the balance sheet in the Unaudited Financial
Statements and (ii) the amount of such Taxes for which Buyer is responsible
pursuant to Section 11.01 and (b) in the case of each Return relating a Straddle
Period, the portion of such Taxes which relates to the portion of such Taxable
period ending on the Closing Date in excess of (i) any reserve for such Tax
liability (rather than any reserve for deferred Taxes established to reflect
timing differences between book and Tax income) shown on the balance sheet in
the Unaudited Financial Statements and (ii) any portion of such Taxes which is
Buyer's responsibility pursuant to Section 11.01 (such excess "Straddle Period
Taxes"). Such Straddle Period Taxes shall be calculated as though the taxable
year of the Company terminated as of the close of business on the Closing Date;
provided, however, that in the case of a Tax not based on income, receipts,
proceeds, profits or similar items, such Straddle Period Taxes shall be equal to
the amount of Tax for the taxable period multiplied by a fraction, the numerator
of which shall be the number of days from the beginning of the taxable period
through the Closing Date and the denominator of which shall be the number of
days in the taxable period. To the extent permitted by applicable law, the
Stockholders shall include any income, gain, loss, deduction or other tax items
for periods ending on or before the Closing Date and for periods beginning
before and ending after the Closing Date on their

                                     - 41 -
<PAGE>   46

Tax Returns in a manner consistent with the Schedule K-1s furnished by the
Company to the Stockholders for such periods. After the Closing, the Company
shall not amend any Tax Return filed before the Closing without Stockholders'
consent.

        11.05  COOPERATION ON TAX MATTERS

               (a)     Buyer, the Company and the Stockholders shall cooperate
fully, as and to the extent reasonably requested by the other party, in
connection with the filing of Tax Returns pursuant to this Section 11 and any
audit, litigation or other proceeding with respect to Taxes. Such cooperation
shall include the retention and (upon the other party's request) the provision
of records and information which are reasonably relevant to any such filing,
audit, litigation or other proceeding and making employees available on a
mutually convenient basis to provide additional information and explanation of
any material provided hereunder. The Company and the Stockholders agree (i) to
retain all books and records with respect to Tax matters pertinent to the
Company relating to any taxable period beginning before the Closing Date until
the expiration of the statute of limitations (and, to the extent notified by
Buyer or the Stockholders, any extensions thereof) of the respective taxable
periods, and to abide by all record retention agreements entered into with any
taxing authority, and (ii) to give the other party reasonable written notice
prior to transferring, destroying or discarding any such books and records and,
if the other party so requests the Company or the Stockholders, as the case may
be, shall allow the other party to take possession of such books and records
prior to such transfer, destruction or discarding.

               (b)     Buyer and the Stockholders further agree, upon request,
to use their reasonable best efforts to obtain any certificate or other document
from any governmental authority or any other person as may be necessary to
mitigate, reduce or eliminate any Tax that could be imposed (including, but not
limited to, with respect to the transactions contemplated hereby).

        11.06  CERTAIN TAXES

               Except as otherwise agreed, all transfer, documentary, sales,
use, stamp, registration and other such Taxes and fees (including any penalties
and interest) incurred in connection with this Purchase Agreement (including any
city transfer tax and any similar tax imposed in other states or subdivisions),
shall be paid one-half by Buyer and one-half by the Stockholders when due, and
the party required by applicable Laws will, at their own expense, file all
necessary Tax Returns and other documentation with respect to all such transfer,
documentary, sales, use, stamp, registration and other Taxes and fees, and, if
required by

                                     - 42 -
<PAGE>   47

applicable Laws, Buyer will, and will cause its Affiliates to, join in the
execution of any such Tax Returns and other documentation.

        11.07  TAX AUDITS

               (a)     The Stockholders shall have the right to represent the
interests of the Company in any Tax audit or administrative or court proceeding
relating to taxable periods of the Company which end on or before the Closing
Date, and to employ counsel of its choice at its expense, provided that the
Stockholders acknowledge in writing their liability, pursuant to Section 11.04
of this Agreement, for such Tax or Tax Return. Buyer shall have the right to
participate in any such Tax proceeding which may adversely affect the Company
after the Closing Date and the Stockholders will not settle any such audit
without the prior written consent of Buyer. Buyer agrees that it will cooperate
fully with the Stockholders and their counsel in the defense or compromise of
any claim in any such proceeding.

               (b)     Buyer shall have the sole right to represent the
interests of the Company in all other Tax audits or administrative or court
proceedings.

12.     TERMINATION

        12.01  TERMINATION

               This Purchase Agreement may be terminated at any time before the
Closing Date under any one or more of the following circumstances:

               (a)     by the mutual written consent of all of the parties
hereto;

               (b)     by Buyer, the Company or the Stockholders, by written
notice of termination delivered to the other parties if the Closing shall not
have occurred prior to April 30, 2001; provided, however, that the right to
terminate this Purchase Agreement under this Section 12.01(b) shall not be
available to any party whose breach of representations, warranties, covenants or
agreements contained in this Purchase Agreement has been the cause of, or
resulted in, the failure of the Closing to occur by such date;

               (c)     by Buyer if the Company or the Stockholders shall have
breached, or failed to comply with, in any material respect any of their
respective material obligations under this Purchase Agreement or any
representation or warranty made by such party shall have been incorrect in any
material respect when made or shall have since ceased to be true and correct in
any material respect,

                                     - 43 -
<PAGE>   48

and such breach, failure or misrepresentation is not cured within thirty (30)
days after notice thereof;

               (d)     by the Company or the Stockholders if Buyer shall have
breached, or failed to comply with, in any material respect any of its material
obligations under this Purchase Agreement or any representation or warranty made
by Buyer shall have been incorrect in any material respect when made or shall
have since ceased to be true and correct in any material respect, and such
breach, failure or misrepresentation is not cured within thirty (30) days after
notice thereof; and

                (e)    by Buyer, the Company or the Stockholders if any decree,
permanent injunction, judgment, order or other action by any court of competent
jurisdiction or any governmental or regulatory authority preventing or
prohibiting consummation of the transactions under this Purchase Agreement shall
have become final and non-appealable.

        12.02  EFFECT OF TERMINATION

               In the event this Purchase Agreement is terminated as provided in
this Article 12, this Purchase Agreement shall forthwith become wholly void and
of no effect, and the parties shall be released from all future obligations
hereunder; provided, however, that the obligations of the parties as to
confidentiality provided in Section 3.02 and the provisions of Section 13.03
relating to the payment of expenses, shall not be extinguished but shall survive
such termination, and nothing herein shall relieve any party for any breach of
this Agreement. The parties hereto shall have any and all remedies to enforce
such obligations provided at law or in equity (including, without limitation,
specific performance).

13.     MISCELLANEOUS

        13.01  ADDITIONAL ACTIONS AND DOCUMENTS

               Each of the parties hereto hereby agrees to take or cause to be
taken such further actions, to execute, deliver and file or cause to be
executed, delivered and filed such further Documents, and will obtain such
consents, as may be necessary or as may be reasonably requested in order to
fully effectuate the purposes, terms and conditions of this Purchase Agreement.

        13.02  BROKERS

               (a)     The Company and the Stockholders jointly and severally
represent and warrant to Buyer that neither such party has (i) engaged any
broker,

                                     - 44 -
<PAGE>   49

finder or agent in connection with the transactions contemplated by this
Purchase Agreement or (ii) incurred (or will incur) any unpaid liability to any
broker, finder or agent for any brokerage fees, finders' fees or commissions,
with respect to the transactions contemplated by this Purchase Agreement.

               (b)     Buyer represents and warrants to the Company and the
Stockholders that Buyer has not (i) engaged any broker, finder or agent in
connection with the transactions contemplated by this Purchase Agreement or (ii)
incurred (and will not incur) any unpaid liability to any broker, finder or
agent for any brokerage fees, finders' fees or commissions, with respect to the
transactions contemplated by this Purchase Agreement.

               (c)     Each party agrees to indemnify, defend and hold harmless
each of the other parties from and against any and all claims asserted against
such parties for any fees or commissions other than those set forth in this
Section by any persons purporting to act or to have acted for or on behalf of
the indemnifying party.

        13.03  EXPENSES

               Subject to the provisions of Article 10, each party hereto shall
pay its own Transaction Expenses; provided, however, that the Company shall be
permitted to pay the Transaction Expenses incurred by the Stockholders prior to
April 2, 2001; provided, further, that the Stockholders shall be jointly and
severally liable for any Transaction Expenses of the Company and the
Stockholders incurred after April 2, 2001.

        13.04  ASSIGNMENT

               Buyer shall have the right to assign its rights and obligations
under this Purchase Agreement (except for its obligations under Section 10.03),
in whole or in part, to an entity in which Buyer owns all of the issued and
outstanding stock (to the extent permitted by law). Except as described in the
immediately preceding sentence, no party shall assign its rights and obligations
under this Purchase Agreement, in whole or in part, whether by operation of law
or otherwise, without the prior written consent of the other parties hereto, and
any such assignment contrary to the terms hereof shall be null and void and of
no force and effect. In no event shall the assignment by any party of its
respective rights or obligations under this Purchase Agreement, whether before
or after the Closing, release such party from its respective liabilities and
obligations hereunder.

                                     - 45 -
<PAGE>   50

        13.05  ENTIRE AGREEMENT; AMENDMENT

               This Purchase Agreement, including the Disclosure Schedule, the
Exhibits and other Documents referred to herein or furnished pursuant hereto,
constitute the entire Agreement among the parties hereto with respect to the
transactions contemplated herein, and supersede all prior oral or written
Agreements, commitments or understandings with respect to the matters provided
for herein. No amendment, modification or discharge of this Purchase Agreement
shall be valid or binding unless set forth in writing and duly executed and
delivered by the party against whom enforcement of the amendment, modification,
or discharge is sought.

        13.06  WAIVER

               No delay or failure on the part of any party hereto in exercising
any right, power or privilege under this Purchase Agreement or under any other
Documents furnished in connection with or pursuant to this Purchase Agreement
shall impair any such right, power or privilege or be construed as a waiver of
any default or any acquiescence therein. No single or partial exercise of any
such right, power or privilege shall preclude the further exercise of such
right, power or privilege, or the exercise of any other right, power or
privilege. No waiver shall be valid against any party hereto unless made in
writing and signed by the party against whom enforcement of such waiver is
sought and then only to the extent expressly specified therein.

        13.07  CONSENT TO JURISDICTION

               (a)     This Purchase Agreement and the duties and obligations
of the parties hereunder and under each of the Documents referred to herein
shall be enforceable against any party in the courts of the United States of
America and of the Commonwealth of Virginia. For such purpose, each party hereto
hereby irrevocably submits to the non-exclusive jurisdiction of such courts, and
agrees that all claims in respect of this Purchase Agreement and such other
Documents may be heard and determined in any of such courts.

               (b)     Each party hereto hereby irrevocably agrees that a final
judgment of any of the courts specified above in any action or proceeding
relating to this Purchase Agreement or to any of the other Documents referred to
herein or therein shall be conclusive and may be enforced in other jurisdictions
by suit on the judgment or in any other manner provided by law.

                                     - 46 -
<PAGE>   51

        13.08  SEVERABILITY

               If any part of any provision of this Purchase Agreement or any
other Agreement or document given pursuant to or in connection with this
Purchase Agreement shall be invalid or unenforceable in any respect, such part
shall be ineffective to the extent of such invalidity or unenforceability only,
without in any way affecting the remaining parts of such provision or the
remaining provisions of this Purchase Agreement.

        13.09  GOVERNING LAW

               This Purchase Agreement, the rights and obligations of the
parties hereto, and any claims or disputes relating thereto, shall be governed
by and construed in accordance with the laws of the Commonwealth of Virginia
(excluding the choice of law rules thereof).

        13.10  NOTICES

               All notices, demands, requests, or other communications which may
be or are required to be given, served, or sent by any party to any other party
pursuant to this Purchase Agreement shall be in writing and shall be hand
delivered, sent by overnight courier or mailed by first-class, registered or
certified mail, return receipt requested, postage prepaid, or transmitted by
telegram, telecopy or telex, addressed as follows:

               (i)    If to Buyer:

                      BTG, Inc.
                      3877 Fairfax Ridge Road
                      Fairfax, Virginia  22030
                      Attention:  Deborah Fox, Esq.
                      Telecopy No.: (703) 383-4025

                      with a copy (which shall not constitute notice) to:

                      Hogan & Hartson L.L.P.
                      8300 Greensboro Drive
                      Suite 1100
                      McLean, Virginia  22102
                      Attention:  Thomas E. Repke, Esq.
                      Telecopy No.: (703) 610-6200

                                     - 47 -
<PAGE>   52

               (ii)   If to the Company:

                      Research Planning, Inc.
                      6400 Arlington Boulevard
                      Suite 1100
                      Falls Church, Virginia  22042
                      Attention:  ___________
                      Telecopy No.:  _________

                      with a copy (which shall not constitute notice) to:

                      Winston & Strawn
                      1400 L Street, N.W.
                      Washington, D.C. 20005-3502
                      Attention:  Faton A. Bacaj, Esq.
                      Telecopy No.: (202) 371-5950

               (iii)  If to Reynaldo P. Maduro, Sr.:

                      Mr. Reynaldo P. Maduro, Sr.
                      7008 Winterbury Lane
                      Bethesda, Maryland  20814
                      Telecopy No.:  _________

                      with a copy (which shall not constitute notice) to:

                      Winston & Strawn
                      1400 L Street, N.W.
                      Washington, D.C. 20005-3502
                      Attention:  James H. Burnley, IV, Esq.
                      Telecopy No.: (202) 371-5950

               (iv)   If to Charles H. Lyon, III:

                      Mr. Charles H. Lyon, III
                      6318 Karmich Street
                      Fairfax Station, Virginia  22039
                      Telecopy No.:  ___________

                                     - 48 -
<PAGE>   53

               (v)    If to Grant C. Peterson:

                      Mr. Grant C. Peterson
                      6611 Thurlton Drive
                      Alexandria, Virginia  22315
                      Telecopy No.:  ______________

Each party may designate by notice in writing a new address to which any notice,
demand, request or communication may thereafter be so given, served or sent.
Each notice, demand, request, or communication which shall be hand delivered,
sent, mailed, telecopied or telexed in the manner described above, or which
shall be delivered to a telegraph company, shall be deemed sufficiently given,
served, sent, received or delivered for all purposes at such time as it is
delivered to the addressee (with the return receipt, the delivery receipt, or
(with respect to a telecopy or telex) the answerback being deemed conclusive,
but not exclusive, evidence of such delivery) or at such time as delivery is
refused by the addressee upon presentation.

        13.11  HEADINGS

               Article and Section headings contained in this Purchase Agreement
are inserted for convenience of reference only, shall not be deemed to be a part
of this Purchase Agreement for any purpose, and shall not in any way define or
affect the meaning, construction or scope of any of the provisions hereof.

        13.12  EXECUTION IN COUNTERPARTS

               To facilitate execution, this Purchase Agreement may be executed
in as many counterparts as may be required. It shall not be necessary that the
signatures of, or on behalf of, each party, or that the signatures of all
persons required to bind any party, appear on each counterpart; but it shall be
sufficient that the signature of, or on behalf of, each party, or that the
signatures of the persons required to bind any party, appear on one or more of
the counterparts. All counterparts shall collectively constitute a single
Agreement. It shall not be necessary in making proof of this Purchase Agreement
to produce or account for more than a number of counterparts containing the
respective signatures of, or on behalf of, all of the parties hereto.

        13.13  LIMITATION ON BENEFITS

               The covenants, undertakings and agreements set forth in this
Purchase Agreement shall be solely for the benefit of, and shall be enforceable
only by, the parties hereto and their respective successors, heirs, executors,
administrators, legal representatives and permitted assigns, except that the

                                     - 49 -
<PAGE>   54

agreements set forth in Article 10 also shall be for the benefit of, and
enforceable by, Buyer Indemnified Persons and their respective successors,
heirs, executors, administrators, legal representatives or permitted assigns.

        13.14  BINDING EFFECT

               Subject to any provisions hereof restricting assignment, this
Purchase Agreement shall be binding upon and shall inure to the benefit of the
parties hereto and their respective successors, heirs, executors,
administrators, legal representatives and assigns.

                            [SIGNATURE PAGE FOLLOWS]

                                     - 50 -
<PAGE>   55

               IN WITNESS WHEREOF, the parties hereto have duly executed this
Stock Purchase Agreement, or have caused this Stock Purchase Agreement to be
duly executed on their behalf, as of the day and year first above written.

                                         BUYER:

                                         BTG, INC.

                                         By:  /s/ EDWARD H. BERSOFF
                                            ------------------------------------
                                                  Edward H. Bersoff
                                                  President and Chief Executive
                                                  Officer

                                         COMPANY:

                                         RESEARCH PLANNING, INC.

                                         By:  /s/ REYNALDO P. MADURO, SR.
                                            ------------------------------------
                                                  Reynaldo P. Maduro, Sr.
                                                  President and Chief Executive
                                                  Officer

                                         STOCKHOLDERS:

                                          /s/ REYNALDO P. MADURO, SR.
                                         ---------------------------------------
                                         Reynaldo P. Maduro, Sr.

                                          /s/ CHARLES H. LYON, III
                                         ---------------------------------------
                                         Charles H. Lyon, III

                                          /s/ GRANT C. PETERSON
                                         ---------------------------------------
                                         Grant C. Peterson

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00026-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00026-of-00352.parquet"}]]