Document:

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                                                                   EXHIBIT 10.9

          COLLATERAL ASSIGNMENT OF INDEMNIFICATION FOR REPRESENTATIONS,
                            WARRANTIES AND COVENANTS

                This Collateral Assignment of Indemnification for
Representations, Warranties, Covenants and Indemnities (this "Assignment"),
dated as of September 7, 1999, made by VERIDIAN CORPORATION, a Delaware
corporation with an office at 2001 North Beauregard Street, Suite 1200,
Alexandria, Virginia 22311-1732 ("Company"), to First Union National Bank, a
national banking association with an office at 1970 Chain Bridge Road, VA 1942,
McLean, Virginia 22102-4099 ("Administrative Agent"), as Administrative Agent
for the Lenders party from time to time to the Credit Agreement referred to
below.

                                   WITNESSETH:

                WHEREAS, Company and ERIM International, Inc., a Michigan
corporation ("ERIM"), have entered into that certain Agreement and Plan of
Merger, dated as of August 6, 1999 (as the same may hereafter be amended,
supplemented, amended and restated, renewed or otherwise modified from time to
time, the "Agreement");

                WHEREAS, pursuant to the Agreement, ERIM has made certain
representations and warranties to, and covenants and agreements with, the
Company (collectively, the "Representations, Warranties and Covenants"), and has
agreed to indemnify the Company for certain breaches of such Representations,
Warranties and Covenants (the "Indemnification");

                WHEREAS, Company, Administrative Agent and certain Lenders (as
defined in the Credit Agreement referred to herein) have entered into that
certain Revolving Credit Agreement, dated as of the date hereof (as the same may
be amended, supplemented, amended and restated, renewed or otherwise modified
from time to time, the "Credit Agreement"), and, pursuant to the Security
Agreement, dated as of the date hereof, Administrative Agent has been granted
security interests in and liens on all of Company's assets,

                WHEREAS, Administrative Agent has required, as a condition to
its entering into the Credit Agreement, that Company assigns to Administrative
Agent, as additional security for the repayment of the Secured Obligations (as
defined in the Credit Agreement), all of Company's rights and remedies with
respect to Indmnification for any breach of the Representations, Warranties and
Covenants;

                NOW, THEREFORE, in consideration of the premises set forth and
for other good and valuable consideration, Company agrees as follows:

<PAGE>

                1.      Company hereby collaterally assigns and transfers to
Administrative Agent for the benefit of the Lenders, and grants a security
interest in, as additional security for the repayment in full of the Secured
Obligations, all of Company's rights and remedies with respect to
Indemnification for any breach of the Representations, Warranties and Covenants,
and any payments due from ERIM to the Company under or pursuant to the
Agreement.

                2.      Following the occurrence and continuance of an Event of
Default, a) the Company hereby irrevocably authorizes and empowers
Administrative Agent or its agents, in the sole discretion of Administrative
Agent, to assert, either directly or on behalf of the Company, any claims the
Company may, from time to time, have against ERIM with respect to
Indemnification for any breach of the Representations, Warranties and Covenants
or with respect to any payments due from the ERIM to the Company under or
pursuant to the Agreement, as Administrative Agent may deem proper, and to
receive and collect any damages, awards and other monies resulting therefrom and
to apply the same on account of any of the Secured Obligations, and b) the
Company hereby irrevocably makes, constitutes and appoints Administrative Agent
(and all officers, employees or agents designated by Administrative Agent) as
Company's true and lawful attorney (and agent-in-fact) for the purpose of
enabling Administrative Agent or its agents to assert and collect such claims
and to apply such monies in the manner set forth hereinabove. Notwithstanding
the foregoing, Administrative Agent agrees that until an Event of Default (which
for purposes of this Assignment shall mean an Event of Default as defined under
the Credit Agreement) shall occur Company alone shall have the right to assert
claims against ERIM in connection with Indemnification for any breach of the
Representations, Warranties and Covenants, provided that Company gives
Administrative Agent written notice of its intention to assert any such claims
and keeps Administrative Agent informed of the status of any proceedings
concerning such claims.

                3.      Company shall keep Administrative Agent informed of all
circumstances known to Company bearing upon the Representations, Warranties and
Covenants, and Company shall not waive any of its rights or remedies under the
Agreement with respect to the Representations, Warranties and Covenants or
Indemnification therefor without the prior written consent of Administrative
Agent.

                4.      This Assignment shall continue in effect until the
Secured Obligations have been finally paid in full and the Credit Agreement has
been terminated, at which time Administrative Agent, upon receipt of written
request of Company, shall release to Company Administrative Agent's interests in
Indemnification for any breach of the Representations, Warranties and Covenants.

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                5.      Unless otherwise defined herein, all terms used herein
shall have their defined meanings under the Credit Agreement.

                6.      At any time or from time to time, upon Administrative
Agent's written request, Company will execute and deliver to Administrative
Agent such further documents and do such other acts and things as Administrative
Agent may request in order further to effect the purposes of this Assignment,
including, without limitation, the filing or recording of this Assignment or any
schedule, amendment or supplement hereto, or a financing or continuation
statement with respect hereto in accordance with the laws of any applicable
jurisdictions. Company hereby authorizes Administrative Agent to effect any such
filing or recording as aforesaid (including the filing of any such financing
statements or amendments thereto without the signature of Company), and
Administrative Agent's costs and expenses with respect thereto shall be payable
by Company on demand.

                7.      Company hereby represents and warrants that (i) the
Agreement is in full force and effect and is enforceable accordance with its
terms, (ii) no default exists under the Agreement, (iii) Company has not
assigned or pledged or otherwise encumbered the Agreement other than as
contemplated hereby, (iv) Company has full power, authority and legal right to
assign its rights under the Agreement pursuant to this Assignment, and ERIM has
authority and legal right to consent to such assignment, (v) this Assignment has
been duly authorized, executed and delivered by Company and constitutes a legal,
valid and binding obligation of Company, enforceable in accordance with its
terms against Company, (vi) no consent of any other person and no consent,
license, permit, approval or authorization of, exemption by, notice or report
to, or registration, filing or declaration with, any governmental authority,
domestic or foreign, is required to be obtained by Company in connection with
the execution, delivery or performance of this Assignment except those that have
been obtained, (vii) the execution, delivery and performance of this Assignment
will not violate any provision of any statute or law or contractual obligation
to which Company is a party or that purports to be binding upon Company or upon
any of Company's assets and will not result in the creation or imposition of any
lien, charge or encumbrance on or security interest in any of the assets of
Company except as contemplated by this Assignment.

                  8. Company (i) will not assign, pledge or otherwise encumber
any of its right, title or interest under, in or to the Agreement to anyone
other than Administrative Agent and its successors or assigns; (ii) will not
take or omit to take any action, the taking or omission of which could result in
an alteration or impairment of the Agreement, the Representations, Warranties
and Covenants, the Indemnification or this Assignment (iii) will not, except
with the prior written consent of Administrative Agent, enter into any agreement
amending, modifying, restating, renewing or supplementing the Agreement; (iv)
will not consent or agree to any act or omission to act on the part of any party
to the Agreement

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that, without such consent or agreement, would constitute a default thereunder;
(v) will deliver to Administrative Agent a copy of each demand, notice,
communication or document (except those received in the ordinary course of
business) delivered to it in any way relating to the Agreement; and (vi) will
not grant any consents or waivers under the Agreement without receiving the
prior written consent of Administrative Agent.

                9.      Any provision of this Assignment that is prohibited or
unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective
to the extent of such prohibition or unenforceability without invalidating the
remaining provisions hereof, and any such prohibition or unenforceability in any
jurisdiction shall not invalidate or render unenforceable such provision in any
other jurisdiction.

                10.     NONE OF THE TERMS OR PROVISIONS OF THIS ASSIGNMENT MAY
BE WAIVED, ALTERED, MODIFIED OR AMENDED EXCEPT BY AN INSTRUMENT IN WRITING, DULY
EXECUTED BY ADMINISTRATIVE AGENT. THIS ASSIGNMENT AND ALL OBLIGATIONS OF COMPANY
HEREUNDER SHALL BE BINDING UPON THE SUCCESSORS AND ASSIGNS OF COMPANY AND SHALL,
TOGETHER WITH THE RIGHTS AND REMEDIES OF ADMINISTRATIVE AGENT HEREUNDER, INURE
TO THE BENEFIT OF ITS SUCCESSORS AND ASSIGNS. THIS ASSIGNMENT SHALL BE GOVERNED
BY, AND BE CONSTRUED AND INTERPRETED IN ACCORDANCE THE INTERNAL LAWS OF THE
STATE OF NORTH CAROLINA.

                11.     AS SPECIFICALLY BARGAINED INDUCEMENT FOR ADMINISTRATIVE
AGENT TO ENTER INTO THIS ASSIGNMENT AND EXTEND CREDIT TO COMPANY, COMPANY AGREES
THAT ANY ACTION, SUIT OR PROCEEDING IN RESPECT OF OR ARISING OUT OF THIS
ASSIGNMENT, ITS VALIDITY OR PERFORMANCE, AT THE SOLE OPTION OF ADMINISTRATIVE
AGENT, ITS SUCCESSORS AND ASSIGNS, AND WITHOUT LIMITATION ON THE ABILITY OF
ADMINISTRATIVE AGENT, ITS SUCCESSORS AND ASSIGNS, TO EXERCISE ALL RIGHTS AS TO
THE COLLATERAL, THE PREMISES AND OTHER SECURITY FOR THE OBLIGATIONS OR INITIATE
AND PROSECUTE IN ANY APPLICABLE JURISDICTION ACTIONS RELATED TO REPAYMENT OF THE
OBLIGATIONS, SHALL BE INITIATED AND PROSECUTED AS TO ALL PARTIES AND THEIR
SUCCESSORS AND ASSIGNS IN THE STATE AND FEDERAL COURTS LOCATED IN MECKLENBURG
COUNTY, NORTH CAROLINA, IN ANY ACTION, CLAIM OR OTHER PROCEEDING ARISING OUT OF
ANY DISPUTE IN CONNECTION WITH THIS ASSIGNMENT, ANY RIGHTS OR OBLIGATIONS
HEREUNDER OR THEREUNDER, OR THE PERFORMANCE OF SUCH RIGHTS AND OBLIGATIONS. THE
COMPANY HEREBY IRREVOCABLY CONSENTS TO THE SERVICE OF A SUMMONS AND COMPLAINT
AND OTHER PROCESS IN ANY ACTION, CLAIM OR

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PROCEEDING BROUGHT BY THE ADMINISTRATIVE AGENT OR ANY LENDER IN CONNECTION WITH
THIS ASSIGNMENT, ANY RIGHTS OR OBLIGATIONS HEREUNDER, OR THE PERFORMANCE OF ANY
RIGHTS AND OBLIGATIONS, ON BEHALF OF ITSELF OR ITS PROPERTY, IN THE MANNER
SPECIFIED IN SECTION 8.2 OF THE CREDIT AGREEMENT. NOTHING IN THIS PARAGRAPH 11
SHALL AFFECT THE RIGHT OF THE ADMINISTRATIVE AGENT OR ANY LENDER TO SERVE LEGAL
PROCESS IN ANY OTHER MANNER PERMITTED BY APPLICABLE LAW OR AFFECT THE RIGHT OF
THE ADMINISTRATIVE AGENT OR ANY LENDER TO BRING ANY ACTION OR PROCEEDING AGAINST
THE COMPANY OR ITS PROPERTIES IN THE COURTS OF ANY OTHER JURISDICTIONS. TERMS
USED BUT NOT DEFINED HEREIN SHALL HAVE THE RESPECTIVE MEANINGS ASCRIBED THERETO
IN THE CREDIT AGREEMENT. UNLESS OTHERWISE DEFINED HEREIN OR IN THE CREDIT
AGREEMENT, TERMS USED IN ARTICLE 9 OF THE UNIFORM COMMERCIAL CODE IN THE STATE
OF NORTH CAROLINA ARE USED HEREIN AS THEREIN DEFINED ON THE DATE HEREOF. THE
HEADINGS OF THE VARIOUS SUBDIVISIONS HEREOF ARE FOR CONVENIENCE OF REFERENCE
ONLY AND SHALL IN NO WAY MODIFY AND OF THE TERMS OR PROVISIONS HEREOF.

                12.     Any notice required, permitted or contemplated hereunder
shall be in writing and addressed to the party to be notified at the address set
forth below or at such other address as each party may designate for itself from
time to time by notice hereunder, and shall be deemed validly given (i) three
(3) days following deposit in the U.S. mails, with proper postage prepaid, (ii)
the next business day after such notice was delivered to a regularly scheduled
overnight delivery carrier with delivery fees either prepaid or an arrangement,
satisfactory with such carrier, made for the payment thereof, or (iii) upon
receipt of notice given by telecopy, mailgram, telegram, telex or personal
delivery:

        To Administrative Agent:           First Union National Bank
                                           1970 Chain Bridge Road
                                           VA 1942
                                           McLean, Virginia 22102-4099
                                           Attention:  Christopher Hetterly
                                           Telephone No: (703) 760-6004
                                           Facsimile No.: (703) 760-6019

        To Company:                        c/o Veridian Corporation
                                           2001 North Beauregard Street
                                           Suite 1200
                                           Alexandria, Virginia 22311-1732
                                           Attention: Katherine A. Snavely
                                           Telephone No: (703) 575-3113
                                           Facsimile No.: (703) 575-3200

<PAGE>

                13.     (a)     Binding Arbitration. Upon demand of any party,
whether made before or after institution of any judicial proceeding, any
dispute, claim or controversy arising out of, connected with or relating to this
Assignment ("Disputes"), between or among parties to this Assignment, or any
other Loan Document shall be resolved by binding arbitration as provided herein.
Institution of a judicial proceeding by a party does not waive the right of that
party to demand arbitration hereunder. Disputes may include, without limitation,
tort claims, counterclaims, claims brought as class actions, claims arising from
this Assignment executed in the future, disputes as to whether a matter is
subject to arbitration, or claims concerning any aspect of the past, present or
future relationships arising out of or connected with this Assignment.
Arbitration shall be conducted under and governed by the Commercial Financial
Disputes Arbitration Rules (the "Arbitration Rules") of the American Arbitration
Association (the "AAA") and the Federal Arbitration Act. All arbitration
hearings shall be conducted in Charlotte, North Carolina. The expedited
procedures set forth in Rule 51, et seq. of the Arbitration Rules shall be
applicable to claims of less than $1,000,000. All applicable statutes of
limitations shall apply to any Dispute. A judgment upon the award may be entered
in any court having jurisdiction. Notwithstanding anything foregoing to the
contrary, any arbitration proceeding demanded hereunder shall begin within
ninety (90) days after such demand thereof and shall be concluded within
one-hundred twenty (120) days after such demand. These time limitations may not
be extended unless a party hereto shows cause for extension and then such
extension shall not exceed a total of sixty (60) days. The panel from which all
arbitrators are selected shall be comprised of licensed attorneys selected from
the Commercial Finance Dispute Arbitration Panel of the AAA. The single
arbitrator selected for expedited procedure shall be a retired judge from the
highest court of general jurisdiction, state or federal, of the state where the
hearing will be conducted. The parties hereto do not waive any applicable
Federal or state substantive law except as provided herein.

        (b)     JURY TRIAL. THE ADMINISTRATIVE AGENT, EACH LENDER AND THE
COMPANY HEREBY ACKNOWLEDGE THAT BY AGREEING TO BINDING ARBITRATION THEY HAVE
IRREVOCABLY WAIVED THEIR RESPECTIVE RIGHTS TO A JURY TRIAL WITH RESPECT TO ANY
ACTION, CLAIM OR OTHER PROCEEDING ARISING OUT OF ANY DISPUTE IN CONNECTION WITH
THIS ASSIGNMENT, ANY RIGHTS OR OBLIGATIONS HEREUNDER OR THEREUNDER, OR THE
PERFORMANCE OF SUCH RIGHTS AND OBLIGATIONS.

        (c)     Preservation of Certain Remedies. Notwithstanding the preceding
binding arbitration provisions, the parties hereto preserve, without diminution,
certain remedies that such Persons may employ or exercise freely, either alone,
in conjunction with or during a Dispute. Each such Person shall have and hereby
reserves the right to proceed in any court of proper jurisdiction or by self
help to exercise or prosecute the following remedies: (i) all rights to
foreclose against any

<PAGE>

real or personal property or other security by exercising a power of sale
granted in the Agreement or the Credit Agreement or under applicable law or by
judicial foreclosure and sale, (ii) all rights of self help including peaceful
occupation of property and collection of rents, set off, and peaceful possession
of property, (iii) obtaining provisional or ancillary remedies including
injunctive relief, sequestration, garnishment, attachment, appointment of
receiver and in filing an involuntary bankruptcy proceeding, and (iv) when
applicable, a judgment by confession of judgment. Preservation of these remedies
does not limit the power of an arbitrator to grant similar remedies that may be
requested by a party in a Dispute.

                  IN WITNESS WHEREOF, this Assignment has been duly executed by
Company as of the 7th day of September, 1999.

[Corporate Seal]                           VERIDIAN CORPORATION

Signed and acknowledged
in the presence of

                                           /s/ KATHERINE A. SNAVELY
                                           -------------------------------------
/s/ PHYLLIS SEIDLER                        Katherine A. Snavely
------------------------------             Title: Senior Vice President,
Name: Phyllis Seidler                      Finance, Chief Financial Officer,
     -------------------------             Treasurer and Secretary<PAGE>

                                                                  EXHIBIT 10.10

FORM OF PATENT SECURITY AGREEMENT, DATED AS OF SEPTEMBER 7, 1999, AND SIGNED ON
SEPTEMBER 14, 2000, AMONG FIRST UNION NATIONAL BANK AND:

Pacific-Sierra Research Corporation

Veridian Engineering, Inc.

Veridian ERIM International, Inc.

<PAGE>

                          PATENT SECURITY AGREEMENT

         WHEREAS, Pacific-Sierra Research Corporation, a corporation organized
under the laws of California ("Grantor"), owns the patents and patent
applications listed on Schedule 1 annexed hereto, and is a party to the patent
licenses listed on Schedule 1 annexed hereto; and

         WHEREAS, pursuant to an Amended and Restated Credit Agreement (as
amended, restated and otherwise modified, the "Credit Agreement") of even date
herewith among Veridian Corporation (the "Borrower"), such Lenders party
thereto (collectively, the "Lenders"), First Union National Bank, as
administrative agent (the "Administrative Agent") and Bank of America, N.A.,
as Syndication Agent, the Lenders have agreed to extend certain credit
facilities to the Borrower on the terms and conditions more particularly
described in the Credit Agreement; and

         WHEREAS, pursuant to the terms of the Guarantor Security Agreement
and other Security Documents dated September 7, 1999 by and between the
Administrative Agent and Grantor (collectively referred to as the "Security
Documents"), as reaffirmed by the Reaffirmation of Documents dated of even
date herewith by and among the Administrative Agent, the Borrower, the Grantor
and certain other subsidiaries of the Borrower (as said agreement may be
amended, restated or otherwise modified from time to time, the "Reaffirmation
of Documents "), Grantor has granted to the Administrative Agent for the
ratable benefit of itself and Lenders a security interest in certain of its
assets, including all right, title and interest of the Grantor in, to and
under all now owned and hereafter acquired Intellectual Property (as such term
is defined in the Guarantor Security Agreement) including patents, patent
applications and patent licenses, and all products and proceeds thereof, to
secure the payment of all Obligations owing by the Borrower under the Credit
Agreement and the other Loan Documents. All capitalized terms not otherwise
defined herein have the respective meanings provided for in the Credit
Agreement or the Security Documents;

         NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, Grantor does hereby grant to the
Administrative Agent for the ratable benefit of itself and Lenders a
continuing security interest in all of Grantor's right, title and interest in,
to and under the following (all of the following items or types of property
being herein collectively referred to as the "Patent Collateral"), whether now
existing or hereafter created or acquired in order to secure the Obligations
referred to herein:

                  (1)      each patent and patent application, including,
         without limitation, each patent and patent application referred to in
         Schedule 1 annexed hereto, together with any reissues, continuations
         or extensions thereof, and all of the goodwill of the business
         connected with the use of, and symbolized by, each patent and patent
         application;

                  (2)      each patent license, including, without limitation,
         each patent license listed on Schedule 1 annexed hereto; and

                                      2

<PAGE>

                  (3)      all products and proceeds of the foregoing,
         including, without limitation, any claim by Grantor against third
         parties for past, present or future infringement of any patent,
         including, without limitation, any patent referred to in Schedule 1
         annexed hereto, any patent issued pursuant to a patent application
         referred to in Schedule 1 and any patent licensed under any patent
         license listed on Schedule 1 annexed hereto.

         This security interest is granted in conjunction with the security
interests granted to the Administrative Agent pursuant to the Security
Documents as reaffirmed by the Reaffirmation of Documents. Grantor hereby
acknowledges and affirms that the rights and remedies of the Administrative
Agent with respect to the security interest in the Patent Collateral made and
granted hereby are more fully set forth in the Security Documents, the terms
and provisions of which are incorporated by reference herein as if fully set
forth herein.

                           [Signature Pages Follow]

                                      2

<PAGE>

         IN WITNESS WHEREOF, Grantor has caused this Patent Security Agreement
to be duly executed by its duly authorized officer thereunto as of the _____
day of __________, 2000.

                                      PACIFIC-SIERRA RESEARCH CORPORATION

                                      By:
                                         --------------------------------------
                                         Name:
                                              ---------------------------------
                                         Title:
                                               --------------------------------

                          [Signature Pages Continue]

[Patent Security Agreement]

<PAGE>

Agreed and Accepted as of the
_____ day of  __________, 2000.

FIRST UNION NATIONAL BANK,
  as Administrative Agent

By:
   ---------------------------------------
     Name:
          --------------------------------
     Title:
           -------------------------------

                           [Acknowledgment Follows]

[Patent Security Agreement]

<PAGE>

                                ACKNOWLEDGMENT

STATE OF _________________

COUNTY OF ________________

         I, _____________________________, a Notary Public for said County and
State, do hereby certify that ____________________ personally appeared before
me this day and stated that (s)he is _________________ of Pacific-Sierra
Research Corporation and acknowledged, on behalf of Pacific-Sierra Research
Corporation the due execution of the foregoing instrument.

         Witness my hand and official seal, this ____ day of __________, 2000.

                                            ------------------------------------
                                                              Notary Public
My commission expires:

----------------------

[Patent Security Agreement]

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[Patent Security Agreement]

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