Document:

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                                                                   Exhibit 10.25

                                  SPARTA, INC.
                             STOCK COMPENSATION PLAN

                       Effective as of September 19, 1995

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                                TABLE OF CONTENTS

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ARTICLE I

               DEFINITIONS ..................................................................1
               1.1    Account ...............................................................1
               1.2    Award .................................................................1
               1.3    Awarding Authority ....................................................1
               1.4    Beneficiary ...........................................................1
               1.5    Board .................................................................1
               1.6    Committee .............................................................1
               1.7    Company ...............................................................1
               1.8    Company Stock .........................................................1
               1.9    Distribution ..........................................................1
               1.10   Employee ..............................................................1
               1.11   Participant ...........................................................2
               1.12   Plan ..................................................................2
               1.13   Share Unit ............................................................2
               1.14   Trust .................................................................2
               1.15   Trustee ...............................................................2

ARTICLE II

               PARTICIPATION AND AWARDS .....................................................2
               2.1    Designation by Awarding Authority .....................................2
               2.2    Awarding Authority to Make Awards .....................................2
               2.3    Awards to be Held in Trust ............................................2
               2.4    Vesting and Forfeiture ................................................3

ARTICLE III

               TRUST FUND ...................................................................3
               3.1    Trust Fund Established ................................................3
               3.2    Company, Committee and Trustee Not Responsible
                      for Adequacy of Trust Fund ............................................3

ARTICLE IV

               ACCOUNTING PROCEDURES ........................................................3
               4.1    Committee to Maintain Accounts ........................................3
               4.2    Accounting Procedures .................................................3
               4.3    Invasion of Trust by Creditors ........................................4
               4.4    Trust Expenses ........................................................4

ARTICLE V

               RIGHTS IN ACQUIRED STOCK .....................................................4
               5.1    Power to Vote Stock Rests With Trustee ................................4
               5.2    Dividends .............................................................4
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ARTICLE VI

               DISTRIBUTION OF ACCOUNTS .....................................................4
               6.1    Time of Distribution ..................................................4
               6.2    Form of Distribution ..................................................4
               6.3    Beneficiary Designation ...............................................5
               6.4    Distribution to Guardian ..............................................5
               6.5    Withholding of Taxes ..................................................5

ARTICLE VII

               ACCELERATION OF DISTRIBUTION AND VESTING .....................................6
               7.1    Termination of Employment .............................................6
               7.2    Change in Control .....................................................6
               7.3    Hardship ..............................................................6

ARTICLE VIII

               PLAN TERMINATION AND AMENDMENT ...............................................6
               8.1    Termination and Amendments ............................................6

ARTICLE IX

               PLAN ADMINISTRATION ..........................................................7
               9.1    Committee .............................................................7
               9.2    Committee Powers ......................................................7
               9.3    Plan Expenses .........................................................8
               9.4    Reliance Upon Documents and Opinions ..................................8
               9.5    Requirement of Proof ..................................................9
               9.6    Limitation on Liability ...............................................9
               9.7    Indemnification .......................................................9

ARTICLE X

               MISCELLANEOUS PROVISIONS ....................................................10
               10.1   Restrictions on Plan Interest ........................................10
               10.2   No Enlargement of Employee Rights ....................................10
               10.3   Rights of Repurchase and First Refusal for the
                      Company; Right of Participant to Sell Company Stock in Repurchase
                      Program ..............................................................11
               10.4   Mailing of Payments ..................................................11
               10.5   Inability to Locate Participant or Beneficiary .......................11
               10.6   Governing Law ........................................................11
               10.7   Records ..............................................................11
               10.8   Illegality of Particular Provision ...................................11
               10.9   Receipt or Release ...................................................11
               10.10  Arbitration ..........................................................12
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                                  SPARTA, INC.
                             STOCK COMPENSATION PLAN

                                     PURPOSE

        This Plan is an unfunded compensation arrangement established effective
on September 19, 1995 by SPARTA, Inc. ("SPARTA") to make deferred awards of
company stock to selected employees.

                                    ARTICLE I
                                   DEFINITIONS

        Whenever the following terms are used in the Plan they shall have the
meaning specified below, unless the context indicates clearly to the contrary.

        1.1. Account. The bookkeeping account established for an Employee
pursuant to Article IV to record the number of Share Units awarded to the
Employee and the vesting thereof.

        1.2. Award. The award of Share Units in the Trust to an Employee
pursuant to the Plan.

        1.3. Awarding Authority. The individual or group of individuals
appointed by the Board to make Awards pursuant to the Plan.

        1.4. Beneficiary. The person or persons properly designated by the
Participant, in accordance with Section 6.3, to receive the benefits provided
herein upon death of the Participant.

        1.5. Board. The Board of Directors of SPARTA, Inc.

        1.6. Committee. The committee appointed by the Board to administer the
Plan. Members of the Committee shall be eligible to receive Awards under the
Plan at the discretion of the Awarding Authority.

        1.7. Company. SPARTA, Inc., a Delaware corporation, and any subsidiary
thereof if the Awarding Authority has approved participation in this Plan by the
Employees of such subsidiary.

        1.8. Company Stock. The Common Stock of SPARTA, Inc.

        1.9. Distribution. Payment of the vested balance in a Participant's
Account from the Trust to the Participant or the Participant's Beneficiary.

        1.10. Employee. A salaried employee of the Company.

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        1.11. Participant. An Employee designated by the Committee to receive an
Award under the Plan.

        1.12. Plan. The SPARTA, Inc. Stock Compensation Plan as set forth herein
and as amended from time to time by the Board.

        1.13. Share Unit. The interest of a Participant in a share of Company
Stock held in the Participant's Account in the Trust.

        1.14. Trust. The SPARTA, Inc. Stock Compensation Plan Trust established
by the Company to hold all assets awarded to Participants under the Plan.

        1.15. Trustee. Jerry R. Fabian or such successor trustee as shall be
appointed pursuant to the Trust.

                                   ARTICLE II
                            PARTICIPATION AND AWARDS

        2.1. Designation by Awarding Authority. The Awarding Authority in its
sole discretion shall designate those Employees who are to receive Awards under
the Plan. The Awarding Authority's designation of an Employee for a particular
Award shall not require the Awarding Authority to make any further Awards to
such Employee.

        2.2. Awarding Authority to Make Awards. The Awarding Authority shall
make Awards under the Plan by determining a number of Share Units to be credited
to those Employees whom the Awarding Authority has selected for participation in
the Plan corresponding to a specified number of shares of Company Stock
allocated in the Trust to such Employees, and by establishing an Account in
favor of such Employees in accordance with Article IV to hold such Share Units.
A separate Account shall be established for each Award. Each Account shall be
subject to a vesting schedule specified by the Awarding Authority. The amount,
timing and vesting of each Award shall be decided in the Awarding Authority's
sole discretion, and the Awarding Authority may apply different terms to Awards
made to different Employees as well as to different Awards made to the same
Employee. Notwithstanding the foregoing, however, the aggregate number of Share
Units covered by Awards made under the Plan shall not exceed five hundred
thousand (500,000).

        2.3. Awards to be Held in Trust. Within a reasonable period of time
following the date of an Award, SPARTA shall contribute to the Trust Company
Stock or an amount of money sufficient to purchase shares of Company Stock
corresponding to the Share Units made in such Award. The Trustee shall apply
such contribution toward the purchase of Company Stock in accordance with the
directions of the Committee and the terms of the Trust. To the extent any such
Award is made to an Employee of an affiliate of SPARTA, SPARTA may charge the
cost of the corresponding Trust contribution to such affiliate as agreed between
SPARTA and the affiliate.

        2.4. Vesting and Forfeiture. Each Account shall be subject to a vesting
schedule, not to exceed five (5) years, established by the Awarding Authority.
Vesting shall cease upon termination of the Participant's employment with the
Company for any reason, including the

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death of the Participant. For purposes of the Plan, an Employee's leave of
absence exceeding thirty (30) days other than (i) a leave of absence caused by
the Employee's disability, as defined under the terms of any of the Company's
short-term or long-tern disability plans, (ii) a qualified military leave as
determined by the Committee, (iii) a family or medical leave covered by federal
or state family/medical leave acts, or (iv) any other leave requested by the
Employee which is approved in writing by both the Company and the Committee,
shall be considered a termination of employment effective on the thirtieth day
of such leave of absence. The unvested portion of a Participant's Accounts upon
a termination of employment shall be immediately forfeited by the Participant,
and the shares of Company Stock represented by such unvested portion shall be
returned to the Company or reallocated in accordance with the Committee's
directions and the terms of the Trust.

                                   ARTICLE III
                                   TRUST FUND

        3.1. Trust Fund Established. The Company has established the Trust
pursuant to a trust agreement under which the Trustee will hold and administer
in trust all assets deposited with the Trustee in accordance with the terms of
this Plan. The Board shall have the authority to select and remove the Trustee
to act under the trust agreement, and to enter into new or amended trust
agreements as it deems advisable.

        3.2. Company, Committee and Trustee Not Responsible for Adequacy of
Trust Fund. Neither the Company, Committee nor Trustee shall be liable or
responsible for the adequacy of the Trust fund to meet and discharge any or all
payments and liabilities hereunder. All Plan benefits will be paid only from the
Trust assets, and neither the Company, the Committee nor the Trustee shall have
any duty or liability to furnish the Trust with any funds, securities or other
assets except as expressly provided in Section 2.3 hereof. Notwithstanding the
foregoing provisions of this Section 3.2 or any other provision of the Plan,
however, the Trustee shall remain fully responsible, in accordance with
applicable law, for all damages resulting from any breach of the Trustee's
fiduciary duties to the Trust.

                                   ARTICLE IV
                              ACCOUNTING PROCEDURES

        4.1. Committee to Maintain Accounts. The Committee shall open and
maintain a separate Account with respect to each Award made under the Plan for
purposes of keeping a record of the assets held in the Trust for each
Participant and for recording the vesting status of each Award.

        4.2. Accounting Procedures. The Committee shall establish and may amend
from time to time accounting procedures for the purpose of making allocations,
Distributions, valuations and adjustments to Accounts provided for in this
Article IV. A Participant or Beneficiary shall have no contractual or other
right to have a particular accounting procedure or convention apply, or continue
to apply, and the Committee shall be free to alter any such procedure or
convention without obligation to any Participant or Beneficiary.

        4.3. Invasion of Trust by Creditors. If assets of the Trust should be
reduced due to action of the Company's creditors, as provided in the Trust
document, the Committee shall reduce each Account on a pro rata basis to reflect
such reduction in Trust assets, and the Company shall have no obligation to
replace such lost assets.

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        4.4. Trust Expenses. Expenses of the Trust which are not paid by the
Company shall be applied to reduce each Account on a pro rata basis; provided,
however, that in no event shall the "aggregate annual expenses" (as defined in
Rule 260.140.84 of the Rules of the California Corporations Commissioner) of the
Trust which are charged against Accounts exceed the aggregate annual expenses
permitted by Rule 260.140.84.

                                    ARTICLE V
                            RIGHTS IN ACQUIRED STOCK

        5.1. Power to Vote Stock Rests With Trustee. The power to vote any stock
held by the Trustee shall rest solely with the Trustee, who shall vote such
stock in the same proportion that the other shareholders vote their shares of
Company Stock.

        5.2. Dividends. All dividends on Company Stock held in the Trust shall
be held by the Trustee and/or reinvested in Company Stock as directed by the
Committee. The Committee shall allocate such dividends among the Accounts pro
rata to the shares allocated to each Account, without regard to the vesting of
the Accounts.

                                   ARTICLE VI
                            DISTRIBUTION OF ACCOUNTS

        6.1. Time of Distribution. Subject to the acceleration provisions of
Article VII, a Participant's Account shall be distributed as follows:

               (a) If the Participant files an election in a manner prescribed
by the Committee within ninety (90) days following the date of the Award
contained in the Account, the Participant's Account shall be distributed as it
becomes vested, with each payment to be made within a reasonable period of time
following the date of vesting of the portion of the Account to be paid.

               (b) If the Participant fails to make the election described in
subsection (a), the Participant's Account shall be distributed in full within a
reasonable period of time following the fifth anniversary of the date of the
Award contained in such Account.

        6.2. Form of Distribution. Distributions shall be made in the form of
Company Stock, except for cash dividends, if any, which may theretofore have
been paid on the Company Stock held in the Account and not, prior to the
Distribution, reinvested in Company Stock.

        6.3. Beneficiary Designation.

               (a) Upon forms provided by the Committee, each Participant shall
designate in writing the Beneficiary or Beneficiaries whom such Participant
desires to receive the benefits of this Plan, if any, payable in the event of
such Participant's death. A Participant may from time to time change his or her
designated Beneficiary or Beneficiaries without the consent of such Beneficiary
or Beneficiaries by filing a new designation in writing with the Committee;
provided, however, that if a married Participant wishes to designate an
individual other than his or her spouse as Beneficiary, such designation shall
not be effective unless consented to in writing by the spouse. Notwithstanding
the foregoing, spousal consent shall not be necessary if

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it is established to the satisfaction of the Committee that there is no spouse
of the Participant or that the required consent cannot be obtained because the
spouse cannot be located or is legally incompetent. The Company may rely upon
the designation of Beneficiary or Beneficiaries last filed by the Participant in
accordance with the terms of this Plan.

               (b) If the designated Beneficiary does not survive the
Participant, or if there is no valid Beneficiary designation, amounts payable
under the Plan shall be paid to the Participant's spouse, or if there is no
surviving spouse, then to the duly appointed and currently acting personal
representative of the Participant's estate. If there is no personal
representative of the Participant's estate duly appointed and acting in that
capacity within sixty (60) days after the Participant's death, then all payments
due under the Plan shall be payable to the person or persons who can verify by
affidavit or court order to the satisfaction of the Committee that they are
legally entitled to receive the benefits specified hereunder pursuant to the
laws of intestate succession or other statutory provision in effect at the
Participant's death in the state in which the Participant resided.

        6.4. Distribution to Guardian. If the Committee shall find that any
person to whom any payment is payable under this Plan is unable to care for his
or her affairs because of illness or accident, or is a minor, a payment due
(unless a prior claim therefor shall have been made by a duly appointed guardian
or other legal representative) may be paid to the spouse, a child, a parent, or
a brother or sister, or to any custodian, conservator or other fiduciary
responsible for the management and control of such person's financial affairs in
such manner and proportions as the Committee may determine. Any such payment
shall be a complete discharge of the liabilities of the Trust under this Plan.

        6.5. Withholding of Taxes. To the extent any Distribution from the Trust
is subject to withholding taxes, the Committee may require, as a condition to
the payment of such Distribution, that the Participant or Beneficiary who is
eligible for the Distribution:

               (a) make payment to the Company in the form of a check for such
withholding taxes; or

               (b) consent to the withholding of shares of Company Stock by the
Trustee sufficient in value to satisfy such withholding taxes, in which case
such shares shall be delivered to the Company which shall make the appropriate
tax withholding.

The Committee may offer either or both of these options to the Participant or
Beneficiary in the Committee's sole discretion.

                                   ARTICLE VII
                    ACCELERATION OF DISTRIBUTION AND VESTING

        7.1. Termination of Employment. Unless sooner distributed in accordance
with Section 6.1, the vested portion of a Participant's Accounts shall be
distributed from the Trust as soon as practicable following termination of the
Participant's employment with the Company for any reason, including death.
Termination of employment shall include certain leaves of absence as specified
in Section 2.4. The Participant and Beneficiary shall forfeit any unvested
portion of the Accounts at the time of such termination.

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        7.2. Change in Control. Every Account shall become fully vested and
shall be immediately distributed to the Participants to whom such Accounts
belong, upon the occurrence of a Change in Control (as hereinafter defined) of
the Company. A Change in Control shall be deemed to occur upon any "person" (as
defined in Section 3(a)(9) of the Securities Exchange Act of 1934), other than
the Company, any subsidiary or any employee benefit plan or trust maintained by
the Company or subsidiary, becoming the beneficial owner (as defined in Rule
13d-3 under the Securities Exchange Act of 1934), directly or indirectly, of
more than twenty-five percent (25%) of the Company Stock outstanding at such
time, without the prior approval of the Board. For purposes of the foregoing, a
subsidiary is any corporation in an unbroken chain of corporations beginning
with the Company if each of the corporations, other than the last corporation in
such chain, owns at least fifty percent (50%) of the total voting power in one
of the other corporations in such chain.

        7.3. Hardship. Notwithstanding the provisions of Section 6.1 hereof, a
Participant shall be entitled to request a hardship Distribution of all or any
portion of the vested portion of his or her Account(s). A Participant must make
a written request for a hardship Distribution, stating the reasons such
withdrawal is necessary because of a financial hardship. The Committee, in its
sole discretion, shall determine whether or not to grant the hardship
Distribution of such Participant's Account(s) and, in so doing, may rely on the
Participant's statements, and a hardship Distribution may be approved without
further investigation unless the Committee has reason to believe such statements
are false.

                                  ARTICLE VIII
                         PLAN TERMINATION AND AMENDMENT

        8.1. Termination and Amendments. No Awards shall be made under the Plan
after the tenth anniversary of the effective date of the Plan, which shall be
the date on which the Plan is approved by the Board. The Plan shall continue,
however, until all amounts have been distributed in accordance with the terms of
the Plan. Notwithstanding the foregoing sentence, the Board retains the right to
amend or terminate the Plan for any reason, including but not limited to adverse
changes in accounting rules or tax laws or the bankruptcy, receivership or
dissolution of the Company. In the event of a Plan amendment or termination,
benefits will either be paid out when due under the terms of the Plan or as soon
as possible as determined by the Committee in its sole discretion. To the extent
feasible, the Committee shall use its best efforts to avoid adversely affecting
the rights of any existing Participants in the Plan, but the Committee shall be
under no specific duty or obligation in this regard.

                                   ARTICLE IX
                               PLAN ADMINISTRATION

        9.1. Committee. The Plan shall be administered by the Committee. Subject
to the provisions of the Plan and the authority granted hereunder to the
Awarding Authority, the Committee shall have exclusive power to determine the
manner and time of Awards and payment of benefits to the extent herein provided
and to exercise any other discretionary powers granted to the Committee pursuant
to the Plan. The decisions or determinations by the Committee shall be final and
binding upon all parties, including shareholders, Participants and other
Employees. The Committee shall have the authority to interpret the Plan, to make
factual findings and determinations, to adopt and revise rules and regulations
relating to the Plan and to make any

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other determinations which it believes necessary or advisable for the
administration of the Plan. The Committee's discretion in these matters shall be
as broad and unfettered as permitted by law.

        9.2. Committee Powers. The Committee shall have all powers necessary to
supervise the administration of the Plan and control its operations. In addition
to any powers and authority conferred on the Committee elsewhere in the Plan or
by law, the Committee shall have, by way of illustration and not by way of
limitation, the following powers and authority:

               (a) To designate agents to carry out responsibilities relating to
the Plan;

               (b) To employ such legal, actuarial, medical, accounting,
clerical and other assistance as it may deem appropriate in carrying out the
provisions of this Plan;

               (c) To administer, interpret, construe and apply this Plan and to
decide all questions which may arise or which may be raised under this Plan by
any Employee, Participant, Beneficiary or other person whomsoever, including but
not limited to all questions relating to eligibility to participate in the Plan,
determination of Awards and the amount of benefits to which any Participant may
be entitled;

               (d) To establish rules and procedures from time to time for the
conduct of its business and for the administration and effectuation of its
responsibilities under the Plan;

               (e) To establish claims procedures, and to make forms available
for filing of such claims, and to provide the name of the person or persons with
whom such claims should be filed. The Committee shall establish procedures for
action upon claims initially made and the communication of a decision to the
claimant promptly and, in any event, not later than sixty (60) days after the
date of the claim; the claim may be deemed by the claimant to have been denied
for purposes of further review described below in the event a written decision
is not furnished to the claimant within such sixty (60) day period. Every claim
for benefits which is denied shall be denied by written notice setting forth in
a manner calculated to be understood by the claimant (1) the specific reason or
reasons for the denial, (2) specific reference to any provisions of this Plan on
which denial is based, (3) description of any additional material or information
necessary for the claimant to perfect his claim with an explanation of why such
material or information is necessary, and (4) an explanation of the procedure
for further reviewing the denial of the claim under the Plan. The Committee
shall establish a procedure for review of claim denials, such review to be
undertaken by the Committee. The review given after denial of any claim shall be
a full and fair review, with the claimant or his duly authorized representative
having one hundred eighty (180) days after receipt of denial of his claim to
request such review, having the right to review all pertinent documents and the
right to submit issues and comments in writing. The Committee shall establish a
procedure for issuance of a decision by the Committee not later than sixty (60)
days after receipt of a request for review from a claimant unless special
circumstances, such as the need to hold a hearing, require a longer period of
time, in which case a decision shall be rendered as soon as possible but not
later than one hundred twenty (120) days after receipt of the claimant's request
for review. The decision on review shall be in writing and shall include
specific reasons for the decision written in a manner calculated to be
understood by the claimant with specific reference to any provisions of this
Plan on which the decision is based; and

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               (f) To perform or cause to be performed such further acts as it
may deem to be necessary, appropriate, or convenient in the efficient
administration of the Plan. Any action taken in good faith by the Committee in
the exercise of authority conferred upon it by this Plan shall be conclusive and
binding upon the Participants and their Beneficiaries. All discretionary powers
conferred upon the Committee shall be absolute.

        9.3. Plan Expenses. Members of the Committee shall serve as such without
compensation from the Plan, but may receive compensation from the Company for so
serving. All Plan administration expenses shall be borne by the Company or the
Trust as determined by the Committee in its sole discretion; provided, however,
that in no event shall the "aggregate annual expenses" (as defined in Rule
260.140.84 of the Rules of the California Corporations Commissioner) of the Plan
which are borne by the Plan exceed the aggregate annual expenses permitted by
Rule 260.140.84.

        9.4. Reliance Upon Documents and Opinions.

               (a) The members of the Committee, the Board, and the Company
shall be entitled to rely upon any:

                      (i) Tables, valuations, computations, estimates,
certificates, opinions and reports furnished by any consultant, or firm or
corporation which employs one or more consultants or advisors; and

                      (ii) Computations, estimates and reports furnished by any
consultants or consulting firms.

               (b) The members of the Committee, the Board, and the Company
shall be fully protected and shall not be liable in any manner whatsoever for
anything done or action taken or suffered in reliance upon any such consultant,
firm, or corporation which employs one or more consultants or counsel.

               (c) Any and all such things done or such actions taken or
suffered by the Committee, the Board, and the Company in so relying shall be
conclusive and binding on all Employees, Participants, Beneficiaries and any
other persons whomsoever, except as otherwise provided by law.

               (d) The Committee may, but is not required to, rely upon all
records of the Company with respect to any matter or thing whatsoever, and may
likewise treat such records as conclusive with respect to all Employees,
Participants, Beneficiaries and any other persons whomsoever, except as
otherwise provided by law.

        9.5. Requirement of Proof. The Committee, the Board, or the Company may
require satisfactory proof of any matter under this Plan from or with respect to
any Employee, Participant or Beneficiary, and no such person shall acquire any
rights or be entitled to receive any benefits under this Plan until such proof
shall be furnished as so required.

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        9.6. Limitation on Liability. No employee or director of the Company and
no other person shall be subject to any liability by reason of or arising from
his or her participation in the establishment or administration or operation of
the Plan unless he or she acts fraudulently or in bad faith or, in the case of
an employee, director or other person acting as Trustee of the Trust, such
employee, director or other person breaches his or her fiduciary duties to the
Trust.

        9.7. Indemnification.

               (a) To the extent permitted by law, the Company shall indemnify
each member of the Awarding Authority, of the Committee, and any other employee
or director of the Company who was or is a party, or is threatened to be made a
party, to any threatened, pending or completed proceeding, whether civil,
criminal, administrative, or investigative, by reason of his or her conduct in
the performance of any duties in connection with the establishment or
administration or operation of the Plan or any amendment or termination of the
Plan.

               (b) This indemnification shall apply against expenses including,
without limitation, attorneys' fees and any expenses of establishing a right to
indemnification hereunder, judgments, fines, settlements and other amounts
actually and reasonably incurred in connection with such proceeding, except in
relation to matters as to which he or she has acted fraudulently or in bad faith
in the performance of such duties.

               (c) The termination of any proceeding by judgment, order,
settlement, conviction, upon a plea of nolo contendere or its equivalent shall
not, in and of itself, create a presumption that the person acted fraudulently
or in bad faith in the performance of his or her duties.

               (d) Expenses incurred in defending any such proceeding may be
advanced by the Company prior to the final disposition of such proceeding, upon
receipt of an undertaking by or on behalf of the recipient to repay such amount,
unless it shall be determined ultimately that the recipient is entitled to be
indemnified as authorized in this Section 9.7.

               (e) The right of indemnification set forth in this Section 9.7
shall be in addition to any other right to which any Awarding Authority member,
Committee member or other person may be entitled as a matter of law, by
corporate bylaws or otherwise.

                                    ARTICLE X
                            MISCELLANEOUS PROVISIONS

        10.1. Restrictions on Plan Interest.

               (a) A Participant's interest in the Plan shall be limited to his
or her Account(s) in the Trust and he or she shall have no other interest in any
assets of the Company nor any right as against the Company, Awarding Authority
or Committee for payment of benefits under the Plan.

               (b) None of the benefits, payments, proceeds, claims or rights
hereunder of any Participant or Beneficiary shall be subject to any claim of any
creditor of such Participant or

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Beneficiary and in particular the same shall not be subject to attachment,
garnishment, or other legal process by any creditor of such Participant or
Beneficiary.

               (c) A Participant or Beneficiary shall not have any right to
alienate, anticipate, commute, pledge, encumber, or assign any of the benefits
or payments or proceeds which he or she may expect to receive, contingently or
otherwise, under the Plan.

               (d) A Participant's and Beneficiary's interest in this Plan and
his or her Account(s) in the Trust are subject to the claims of the Company's
creditors, as provided in the Trust. Each Participant and Beneficiary shall,
however, be considered a general creditor of the Company with respect to the
assets held in his or her Account(s) in the Trust, so that if the Company should
become insolvent, the Participant or Beneficiary will have a claim against the
Trust assets equal to that of the Company's other general creditors (regardless
of whether such assets are removed from the Trust by a trustee in bankruptcy).

        10.2. No Enlargement of Employee Rights.

               (a) This Plan is strictly a voluntary undertaking on the part of
the Company and shall not be deemed to constitute a contract between the Company
and any Employee, or to be consideration for, or an inducement to, or a
condition of, the employment of any Employee.

               (b) An Employee's employment with the Company is not for any
specified term and may be terminated by such Employee or by the Company at any
time for any reason, with or without cause. Nothing in this Plan or in any
agreement pursuant to this Plan shall confer upon any Employee or Participant
any right to continue in the employ of or affiliation with the Company nor
constitute any promise or commitment by the Company regarding future positions,
future work assignments, future compensation or any other term or condition of
employment or affiliation.

               (c) No person shall have any right to any benefits under this
Plan, except to the extent expressly provided herein.

               (d) The Plan is not intended to nor shall it be deemed to be a
plan providing retirement income or resulting in the deferral of income by
employees for periods extending to the termination of covered employment or
beyond.

        10.3. Rights of Repurchase and First Refusal for the Company; Right of
Participant to Sell Company Stock in Repurchase Program. Any Company Stock
distributed from the Plan shall be subject to a right of repurchase and right of
first refusal by the Company. The terms and conditions of the right of
repurchase and right of first refusal shall be those applied to Company Stock by
the Certificate of Incorporation of SPARTA, Inc., as in effect from time to
time. No Company Stock distributed from the Plan to a Participant or Beneficiary
shall be eligible for resale to the Company under any stock repurchase program
operated by the Company until the earlier to occur of (i) six months following
such distribution, or (ii) the termination of the Participant's employment with
the Company.

                                       10
<PAGE>

        10.4. Mailing of Payments. All payments under the Plan shall be
delivered in person or mailed to the last address of the Participant (or, in the
case of the death of the Participant to that of any other person entitled to
such payments under the terms of the Plan). Each Participant shall be
responsible for furnishing the Committee with his or her correct current address
and the correct current name and address of his or her Beneficiary.

        10.5. Inability to Locate Participant or Beneficiary. In the event that
the Committee is unable to locate a Participant or Beneficiary to whom benefits
are payable hereunder after mailing a notice to the Participant's or
Beneficiary's last known address, and such inability lasts for a period of three
(3) years, then any remaining benefits payable hereunder shall be forfeited to
the Company and no Participant or Beneficiary shall have any right to further
benefits from the Plan, even if subsequently located.

        10.6. Governing Law. All legal questions pertaining to the Plan shall be
determined in accordance with the laws of the State of California.

        10.7. Records. The records of the Company with respect to the Plan shall
be conclusive on all Participants, Beneficiaries, and all other persons
whomsoever.

        10.8. Illegality of Particular Provision. If any particular provision of
this Plan shall be found to be illegal or unenforceable, such provision shall
not affect the other provisions thereof, but the Plan shall be construed in all
respect as if such invalid provision were omitted.

        10.9. Receipt or Release. Any payment to any Participant or Beneficiary
in accordance with the provisions of this Plan shall, to the extent thereof, be
in full satisfaction of all claims against the Awarding Authority, the Committee
and the Company, and the Committee may require such Participant or Beneficiary,
as a condition precedent to such payment, to execute a receipt and release to
such effect.

        10.10. Arbitration. The Committee's written decision on review of a
denial of benefits, as provided in Section 9.2(e), shall be final, conclusive
and binding on all Participants, Beneficiaries and Employees of the Company.
Notwithstanding the foregoing, any person disputing such a written decision
shall submit such dispute to binding arbitration pursuant to the rules of the
American Arbitration Association, to be held in Orange County, California. The
losing party in such arbitration proceedings shall bear the costs of
arbitration, and each party shall bear its own attorneys' fees.

                                   End of Plan

                                       11<PAGE>
                                                                   Exhibit 10.26

                                  SPARTA, INC.
                          STOCK COMPENSATION PLAN TRUST

<PAGE>

                                TABLE OF CONTENTS

<TABLE>
<S>                                                                                        <C>
ARTICLE I

               ESTABLISHMENT AND GENERAL OPERATION OF TRUST .................................1
               1.1    Establishment of Trust ................................................1
               1.2    Revocability ..........................................................1
               1.3    Grantor Trust .........................................................1
               1.4    Signing Authority .....................................................1
               1.5    Acceptance of Assets; Trust Composition ...............................2
               1.6    Trust Contributions ...................................................2
               1.7    Plan Administration ...................................................2
               1.8    Change in Control .....................................................2

ARTICLE II

               INVESTMENTS ..................................................................3
               2.1    Company Investment Authority ..........................................3

ARTICLE III

               TRUSTEE'S POWERS .............................................................3
               3.1    Trustee's General Powers ..............................................3
               3.2    Power to Vote Company Stock ...........................................5
               3.3    Sale of Company Stock .................................................5

ARTICLE IV

               PAYMENTS AND RECORDS .........................................................5
               4.1    Payments to Participants and Beneficiaries ............................5
               4.2    Tax Withholding .......................................................5
               4.3    Suspension of Payments on Insolvency ..................................6
               4.4    Accounts and Records ..................................................6
               4.5    Reports ...............................................................6
               4.6    Payments Following a Change in Control ................................6

ARTICLE V

               RESTRICTIONS ON TRANSFER .....................................................7
               5.1    Disputes ..............................................................7
               5.2    Assignment and Alienation Prohibited ..................................7

ARTICLE VI

               RESIGNATION, REMOVAL AND SUCCESSION ..........................................7
               6.1    Resignation or Removal of Trustee .....................................7
               6.2    Designation of Successor ..............................................7
               6.3    Successor's Appointment ...............................................8
               6.4    Successor's Duties ....................................................8
</TABLE>

                                       i
<PAGE>

<TABLE>
<S>                                                                                        <C>
ARTICLE VII

               AMENDMENT ....................................................................8
               7.1    Integration; Power to Amend ...........................................8
               7.2    Limitation on Amendments Following a Change in Control ................8

ARTICLE VIII

               LIABILITIES ..................................................................8
               8.1    Declaration of Intent .................................................8
               8.2    Liability of the Trustee ..............................................9
               8.3    Indemnification .......................................................9

ARTICLE IX

               TERMINATION AND DURATION .....................................................9
               9.1    Revocation and Termination ............................................9
               9.2    Duration ..............................................................9

ARTICLE X

               MISCELLANEOUS ...............................................................10
               10.1   Emergencies and Delegation ...........................................10
               10.2   Expenses and Taxes ...................................................10
               10.3   Third Parties ........................................................11
               10.4   Binding Effect; Successor Corporation ................................11
               10.5   Relation to Plan .....................................................11
               10.6   Partial Invalidity ...................................................11
               10.7   Construction .........................................................11
               10.8   Notices ..............................................................11

ARTICLE XI

               DISTRIBUTIONS IN THE EVENT OF INSOLVENCY OF THE COMPANY .....................12
               11.1   Assets Subject to Creditors' Claims ..................................12
               11.2   Insolvency ...........................................................12
               11.3   Duties on Insolvency .................................................12
               11.4   Determination of Insolvency ..........................................13
</TABLE>

                                       ii
<PAGE>

                                  SPARTA, INC.
                          STOCK COMPENSATION PLAN TRUST

        This Trust Agreement (the "Trust Agreement") is made and dated this 1st
day of February, 1996 by and between SPARTA, Inc., a Delaware corporation (the
"Company"), and Jerry R. Fabian, (the "Trustee").

                                     PURPOSE

        The Company maintains the SPARTA, Inc. Stock Compensation Plan (the
"Plan") pursuant to which the Company expects to make awards of Share Units (as
defined in the Plan) with respect to individuals participating in the Plan (the
"Participants"). In order to provide assurance to some or all such Participants
and their beneficiaries (the "Beneficiaries") that their unfunded stock
compensation rights under the Plan will be met or substantially met, in cases
other than insolvency of the Company, the Company may deliver from time to time
cash and other assets to be held and administered as a trust, established
pursuant to the terms hereof (the "Trust") for the uses and purposes of the
Plan, but subject to the claims of the Company's creditors in the event of the
Company's insolvency as herein defined.

        Subject to specific conditions set forth in this Trust Agreement, the
Trustee will hold shares of the Common Stock of the Company (the "Company
Stock") in trust and invest cash and other acceptable property received pursuant
to this Trust Agreement for the uses and purposes of the Plan according to the
directions of the Company's plan committee (the "Committee") under the terms and
conditions stated below. It is the intention of the parties that the Trust shall
constitute an unfunded arrangement and shall not affect the status of the Plan
as being exempt from the application of the Employee Retirement Income Security
Act of 1974 ("ERISA").

                                    ARTICLE I
                  ESTABLISHMENT AND GENERAL OPERATION OF TRUST

        1.1. Establishment of Trust. The Company hereby establishes the Trust
with the Trustee as a grantor trust.

        1.2. Revocability. The Trust hereby established shall be irrevocable.

        1.3. Grantor Trust. The Trust is intended to be a grantor trust, of
which only the Company is the grantor, within the meaning of subpart E, part I,
subchapter J, chapter 1, subtitle A of the Internal Revenue Code of 1986 (the
"Code"), as amended, and shall be construed accordingly.

        1.4. Signing Authority. The secretary or any assistant secretary of the
Company shall certify in writing to the Trustee the names and specimen
signatures of all those who are authorized to act as or on behalf of the
Company, and those names and specimen signatures shall be updated as necessary
by the secretary or any assistant secretary of the Company. The Company shall
notify the Trustee if any person so designated is no longer authorized to act on

                                       1
<PAGE>

behalf of the Company. Until the Trustee receives notice that a person is no
longer authorized to act on behalf of the Company, the Trustee may continue to
rely on the Company's designation of such person.

        1.5. Acceptance of Assets; Trust Composition. All contributions or
transfers shall be received by the Trustee in the form of cash, Company Stock or
other property acceptable to the Trustee. The Trust shall consist of the
contributions and transfers received by the Trustee, together with the income,
proceeds and earnings from them and any increments to them. The Trustee shall
hold, manage and administer the Trust in accordance with this Trust Agreement
without distinction between principal and income. The principal of the Trust and
any earnings thereon shall be held separate and apart from other funds of the
Company and shall be used exclusively for the uses and purposes of Participants,
Beneficiaries and general creditors as set forth herein. Participants and
Beneficiaries shall have no preferred claim on nor any beneficial ownership
interest in, any assets of the Trust. Any rights created under the Plan and this
Trust Agreement shall be subordinate to the rights of general creditors of the
Company under the terms and conditions specified in Article XI. Any assets held
in the Trust will be subject to the claims of the Company's general creditors
under federal and state law in the event of Insolvency as defined in Article XI.
To the extent of a Participant's or Beneficiary's interest in the Trust, the
Participant or Beneficiary will be considered to be a general creditor of the
Company for the purposes of Article XI.

        1.6. Trust Contributions. The Company shall make contributions to the
Trust in its sole discretion or as otherwise provided in the Plan. Neither the
Trustee nor any Participant or Beneficiary shall have any right to compel such
contributions to the Trust. The Company shall have the right at any time, and
from time to time in its sole discretion, to substitute assets of equal fair
market value for any asset held in the Trust. This right is exercisable by the
Company in a nonfiduciary capacity without the approval or consent of any person
in a fiduciary capacity.

        1.7. Plan Administration. The Company and not the Trustee shall be
responsible for administering the Plan (including without limitation determining
the rights of the Company's employees to participate in the Plan, determining
any Participant's or Beneficiary's right to receive a distribution from the
Trust and issuing statements to Participants and Beneficiaries of their interest
in the Trust).

        1.8. Change in Control. For purposes of this Trust Agreement, a "Change
in Control" shall be deemed to occur if any person (as such term is defined in
Section 3(a)(9) of the Securities Exchange Act of 1934) other than the Company,
any subsidiary or employee benefit plan or trust maintained by the Company or
subsidiary, becomes the beneficial owner (as defined in Rule 13d-3 under the
Securities Exchange Act of 1934), directly or indirectly, of twenty-five percent
(25%) or more of the Company's then outstanding Company Stock without prior
approval of the Company's Board of Directors. For purposes of the foregoing, a
subsidiary is any corporation in an unbroken chain of corporations beginning
with the Company if each of the corporations, other than the last corporation in
such chain, owns at least fifty percent (50%) of the total voting power in one
of the other corporations in such chain. The Trustee shall have no independent
duty to determine whether a Change in Control has occurred and shall not be
required to take any action or refrain from taking any action hereunder which is
based on a

                                       2
<PAGE>

Change in Control having occurred, prior to the time it receives written notice
from the Company or a Participant or Beneficiary that a Change in Control has
occurred and has had a reasonable opportunity to determine whether a Change in
Control, in fact, has occurred. At the Trustee's request, the Company shall
furnish such evidence as may be necessary to enable the Trustee to determine
whether a Change in Control has occurred. In taking or refraining from any
action under this Trust Agreement, the Trustee may rely on its good faith
determination, including an opinion of counsel (who may be counsel to the
Company), that a Change in Control has occurred. The Trustee's determination as
to whether a Change in Control has occurred shall be binding and conclusive on
all persons.

                                   ARTICLE II
                                   INVESTMENTS

        2.1. Company Investment Authority. The Company shall have all power over
and responsibility for the disposition and investment of the Trust assets, and
the Trustee shall comply with proper written directions of the Company
concerning those assets; provided, however, that in no event shall the Trust
engage in any investment practice or activity which is prohibited by Rule
260.140.85 of the Rules of the California Corporations Commissioner. The Trustee
shall have no duty or responsibility to review or initiate action, or make
recommendations regarding Trust assets and shall retain such assets until
directed in writing by the Company to dispose of them.

                                   ARTICLE III
                                TRUSTEE'S POWERS

        3.1. Trustee's General Powers. Except as otherwise provided in this
Trust Agreement, the Trustee shall have full power and authority with respect to
property held in the Trust to exercise all the rights and privileges that could
be exercised by the absolute owner thereof; provided, however, that the powers
specified in this Section 3.1 shall be exercised by the Trustee only at the
specific direction of the Company or in accordance with the provisions of this
Trust Agreement; and provided further that if an insurance policy is held as an
asset of the Trust, the Trustee shall have no power to name a beneficiary of the
policy other than the Trust, to assign the policy (as distinct from conversion
of the policy to a different form) other than to a successor Trustee, or to loan
to any person the proceeds of any borrowing against such policy. Such powers
shall include the following:

               (a) To invest all or part of the Trust corpus in shares of
Company Stock;

               (b) To buy, sell, assign, transfer, acquire, loan, lease (for any
purpose, including beyond the life of this Trust), exchange and in any other
manner to acquire, manage, deal with and dispose of all or any part of the Trust
property, for cash or credit and upon any reasonable terms and conditions;

               (c) To make deposits with any bank or savings and loan
institution, including, if the Trustee is a financial institution, any such
facility of the Trustee or an affiliate thereof, provided that the deposit bears
a reasonable rate of interest;

               (d) To retain all or any portion of the Trust in cash temporarily
awaiting investment or for the purpose of making distributions or other
payments, without liability for interest thereon;

                                       3
<PAGE>

               (e) To invest and re-invest the Trust, or any part thereof, in
any one or more collective investment trust funds (including funds investing in
real estate), including, if the Trustee is a financial institution, common and
group trust funds that are maintained by the Trustee or any affiliate thereof.
The combining of money and other assets of the Trust with money and other assets
of other trusts in such fund or funds is specifically authorized.
Notwithstanding anything to the contrary in this Trust Agreement, the Trustee or
its affiliate shall have full investment responsibility over assets of the Trust
invested in such funds;

               (f) To take all of the following actions as directed by the
Company or other person with investment discretion over the Trust assets: to
vote proxies of any securities; to give general or special proxies or powers of
attorney with or without power of substitution; to exercise any conversion
privileges, subscription rights or other options, and to make any payments
incidental thereto; to consent to or otherwise participate in corporate
reorganizations or other changes affecting securities and to delegate
discretionary powers and to pay any assessments or charges in connection
therewith; and generally to exercise any of the powers of an owner with respect
to stocks, bonds, securities or other property held in the Trust;

               (g) To make, execute, acknowledge and deliver any and all
documents of transfer and conveyance and any and all other instruments that may
be necessary or appropriate to carry out the powers herein granted;

               (h) To invest funds pending required directions in any type of
interest-bearing account including, without limitation, if the Trustee is a
financial institution, time certificates of deposit or interest-bearing accounts
issued by the Trustee, or any mutual fund or short-term investment fund, whether
sponsored or advised by the Trustee or any affiliate thereof;

               (i) To cause all or any part of the Trust to be held in the name
of the Trustee (which in such instance need not disclose its fiduciary capacity)
or, as permitted by law, in the name of any nominee, and to acquire for the
Trust any investment in bearer form; but the books and records of the Trustee
shall at all times show that all such investments are a part of the Trust and
the Trustee shall hold evidences of title to all such investments;

               (j) To serve as sole custodian with respect to the Trust assets;

               (k) To employ such agents and counsel as may be reasonably
necessary in managing and protecting the Trust assets and to pay them reasonable
compensation;

               (l) As directed by the Company:

                      (i) To compensate such executive, consultant, actuarial,
accounting, investment, appraisal, administrative, clerical, secretarial,
medical, custodial, depository and legal firms, personnel and other employees or
assistants as are engaged by the Company in connection with the administration
of the Plan and to pay from the Trust the necessary expenses of such firms,
personnel and assistants, to the extent not paid by the Company; and

                                       4
<PAGE>

                      (ii) To cause the benefits provided under the Plan to be
paid directly to the persons entitled thereto under the Plan, and in the amounts
and at the times and in the manner specified, and to charge such payments
against the Trust;

               (m) To exercise all the further rights, powers, options and
privileges granted, provided for, or vested in trustees generally under
applicable federal or state laws, it being intended that, except as otherwise
provided in this Trust, the powers conferred upon the Trustee herein shall not
be constructed as being in limitation of any authority conferred by law, but
shall be constructed as in addition thereto; and

               (n) Notwithstanding any powers granted to the Trustee by this
Trust Agreement or by applicable law, the Trustee shall not have any power that
could give the Trust the objective of carrying on a business and dividing the
gains therefrom, within the meaning of Section 301.7701-2 of the Procedure and
Administrative Regulations promulgated pursuant to the Internal Revenue Code.

        3.2. Power to Vote Company Stock. The Trustee shall vote any Company
Stock held in the Trust in the same proportion that the other shareholders vote
their shares of Company Stock. The Trustee may rely on written statistics
provided by the secretary or any assistant secretary of the Company concerning
the number of such votes.

        3.3. Sale of Company Stock. The Trustee shall, when directed by the
Company, have the right to sell any shares of Company Stock to the Company for
liquidity purposes.

                                   ARTICLE IV
                              PAYMENTS AND RECORDS

        4.1. Payments to Participants and Beneficiaries. The Company shall
deliver to the Trustee from time to time schedules (the "Payment Schedules")
that indicate the amounts payable in respect of each Participant and
Beneficiary, that provides a formula or other instructions acceptable to the
Trustee for determining the amounts so payable, the form in which such amount is
to be paid (as provided for under the Plan), and the time of commencement for
payment of such amounts. Except as otherwise provided herein, the Trustee shall
make payments to the Participants and their Beneficiaries in accordance with
such Payment Schedules. The entitlement of a Participant or Beneficiary to
benefits under the Plan shall be determined by the Company or such party as it
shall designate under the Plan, and any claim for such benefits shall be
considered and reviewed under the procedures set out in the Plan.

        4.2. Tax Withholding. The Trustee shall, when directed by the Company,
withhold from any payment to a Participant or Beneficiary hereunder the amount
required by law to be so withheld under federal, state and local wage
withholding requirements or otherwise, and shall pay over to the Company or
agency specified by the Company the amount so withheld. The Company shall be
responsible for instructing the Trustee as to liquidation of Trust assets or
other provisions for obtaining sufficient cash to satisfy withholding
requirements. The Trustee shall have no responsibility to determine if such
withholding is required, may rely on instructions from the Company as to any
required withholding and shall be fully protected under Section 8.3

                                       5
<PAGE>

in relying on such instructions. The Company shall be responsible for tax
reporting with respect to withheld amounts.

        4.3. Suspension of Payments on Insolvency. The Trustee shall cease
payment of benefits to Participants and their Beneficiaries if the Company is
Insolvent, in accordance with Article XI.

        4.4. Accounts and Records. The Trustee shall keep accurate and detailed
records of all investments, receipts, disbursements and all other transactions
of the Trust, including such specific records as may be agreed upon in writing
between the Company and the Trustee. All such records shall be open to
inspection and audit at all reasonable times by the Company and by the
Participants and Beneficiaries. Within sixty (60) days after the close of each
calendar year and within sixty (60) days after the resignation or removal of the
Trustee as provided in Article VI hereof, the Trustee shall render to the
Company a written account showing in reasonable summary the investments,
receipts, disbursements and other transactions engaged in by the Trustee during
the preceding calendar year or period with respect to the Trust. Such account
shall set forth the assets and liabilities of the Trust. The Company shall have
one hundred twenty (120) days after the Trustee's mailing of each such account
within which to file with the Trustee written objections to such account. Upon
the expiration of such period, the Trustee shall be forever released and
discharged from all liability and accountability to the Company with respect to
the propriety of its acts and transactions shown in such account except with
respect to (i) any such acts or transactions as to which the Company files
written objections within such one hundred twenty-day period, and/or (ii) any
such acts or transactions constituting a breach by the Trustee of the Trustee's
fiduciary obligations to the Trust.

        4.5. Reports. Except as provided in Section 4.2, the Trustee shall file
such descriptions and reports and shall furnish such information and make such
other publications, disclosures, registrations and other filings as are required
of the Trustee by law.

        4.6. Payments Following a Change in Control. Upon a Change in Control,
as defined in Section 1.8, the Trust shall terminate and the Trustee and Company
shall have the following duties:

               (a) Information to be Provided to Trustee. The Company shall
furnish the Trustee with a Payment Schedule that indicates the amounts payable
to each Participant and Beneficiary under the terms of the Plan, the medium of
payment (e.g., cash or Company Stock) together with instructions for withholding
taxes on each Participant's and Beneficiary's benefits under the Plan. In the
event cash is required to be paid or used for withholding, the Company shall
furnish the Trustee instructions for liquidating Trust assets to obtain the
necessary cash.

               (b) Payments by Trustee. Upon receiving a completed Payment
Schedule as described in paragraph (a), the Trustee shall first distribute the
Trust assets to the Participants and Beneficiaries as set forth in the Payment
Schedule and, second, shall pay any remaining assets to the Company or other
person designated by the Company.

                                       6
<PAGE>

                                    ARTICLE V
                            RESTRICTIONS ON TRANSFER

        5.1. Disputes.

               (a) Should any controversy arise as to whether any distribution
or payment is to be made by the Trustee, or as to any other matter arising in
the administration of the Plan or Trust, the Trustee may retain the amount in
controversy pending resolution of the controversy or the Trustee may file an
action seeking declaratory relief and/or may interplead the Trust assets in
issue, and name as necessary parties the Company, the Participants,
Beneficiaries and/or any or all persons making conflicting demands.

               (b) The Trustee shall not be liable for the payment of any
interest or income, except for that earned as a Trust investment, on any amount
withheld or interpleaded under subsection (a).

               (c) The expense of the Trustee for taking any action under
subsection (a) shall be paid to the Trustee from the Trust, if not paid by the
Company.

        5.2. Assignment and Alienation Prohibited. No right or interest of any
payee in the Trust assets shall be transferable, assignable or subject to
alienation, anticipation, encumbrance, garnishment, attachment or execution and
no benefit actually paid to the Participants or Beneficiaries, or any of them,
shall be subject to any claim for repayment by the Company or the Trustee. The
preceding sentence shall not apply to the creation, assignment, or recognition
of a right to any benefit payable with respect to a Participant pursuant to a
domestic relations order made by a court of competent jurisdiction.
Notwithstanding the foregoing, the Trust shall at all times remain subject to
the claims of creditors of the Company in the event the Company becomes
Insolvent as provided in Article XI.

                                   ARTICLE VI
                       RESIGNATION, REMOVAL AND SUCCESSION

        6.1. Resignation or Removal of Trustee. The Trustee may resign at any
time upon thirty (30) days' prior written notice to the Company (which notice
may be waived by the Company). Prior to a Change in Control, the Company may
remove the Trustee upon thirty (30) days' prior written notice to the Trustee
(which notice may be waived by the Trustee). Upon a Change in Control, the
Trustee may not be removed until all assets of the Trust have been distributed
in accordance with Section 4.6(b).

        6.2. Designation of Successor. Upon notice of the Trustee's resignation
or removal, the Company shall promptly name a successor Trustee who will accept
transfer of the Trust assets. If no successor Trustee is designated within
thirty (30) days of notice of the Trustee's resignation or removal, then the
Company is hereby designated as the successor Trustee unless the Trustee and
Company agree to extend such thirty-day time limit.

        6.3. Successor's Appointment. A successor Trustee shall have the same
powers and duties as those conferred upon the original Trustee hereunder. A
resigning Trustee shall transfer the Trust assets and shall deliver the books,
accounts and records of the Trust to the successor Trustee as soon as
practicable. The resigning Trustee is authorized, however, to reserve such
amount as may be necessary for the payment of its fees and expenses incurred
prior to its resignation, and the Trust assets shall remain liable to reimburse
the resigning Trustee for all

                                       7
<PAGE>

costs, expenses or attorneys' fees or losses incurred, whether before or after
resignation, due solely to the Trustee's holding title to and administration of
Trust assets.

        6.4. Successor's Duties. A successor Trustee shall have no duty to audit
or otherwise inquire into the acts and transactions of its predecessors.

                                   ARTICLE VII
                                    AMENDMENT

        7.1. Integration; Power to Amend. This writing is the entire agreement
between the parties and may be amended only by a writing signed by the Trustee
and the Company. The Company and the Trustee may amend this Trust Agreement in a
manner (1) which does not materially affect the rights and benefits of
Participants and Beneficiaries, or (2) which is necessary to preserve the status
of the Trust as a grantor trust as specified in Section 1.3.

        7.2. Limitation on Amendments Following a Change in Control. Following a
Change in Control, no amendment signed by the Company and the Trustee shall
become effective without the written consent of a two-thirds majority of the
Participants then participating in the Plan.

                                  ARTICLE VIII
                                   LIABILITIES

        8.1. Declaration of Intent. To the full extent permitted by law, it is
the intent of this Article to relieve each fiduciary from all liability for any
acts or omissions of any other fiduciary or any other person and to declare the
absence of liabilities of all persons referred to in this Article to the extent
not imposed by law or by provisions of this Trust Agreement; provided, however,
that nothing contained herein shall relieve the Trustee from any liability under
applicable law resulting from any breach by the Trustee of the Trustee's
fiduciary duties to the Trust. Each of the following Sections, in declaring such
limitation, is set forth without limiting the generality of this Section but in
each case shall be subject to the provisions, limitations and policies set forth
in this Section.

                                       8
<PAGE>

        8.2. Liability of the Trustee.

               (a) Except after a Change in Control as provided in Section 4.6,
the Trustee shall have no powers, duties or responsibilities with regard to the
administration of the Plan or to determine the rights or benefits of any person
having or claiming an interest under the Plan or in the Trust or to examine or
control any disposition of the Trust or part thereof which is directed by the
Company.

               (b) The Trustee shall have no liability for the adequacy of
contributions for the purposes of the Plan or for enforcement of the payment
thereof.

               (c) The Trustee shall have no liability for following proper
directions of the Company when such directions are made in accordance with this
Trust Agreement or the Plan.

        8.3. Indemnification.

               (a) The Company, by adoption of this Trust Agreement, agrees to
indemnify the Trustee for reasonable expenses and to exonerate and indemnify it
to its reasonable satisfaction, from time to time, for or against any and all
loss, expense and liability incurred or to be incurred by it for acts or
omissions of the Company.

               (b) The Company agrees to indemnify the Trustee against any
liability imposed as a result of a claim asserted by any person or persons with
respect to whom the Trustee has acted in good faith in reliance on a direction
of the Company.

                                   ARTICLE IX
                            TERMINATION AND DURATION

        9.1. Revocation and Termination. Unless terminated upon a Change in
Control, as specified in Section 4.6, the Trust shall terminate upon
satisfaction of all liabilities to Participants and Beneficiaries under the
Plan, at which time the Trustee shall distribute the remaining Trust assets, if
any, as and when directed by the Company. In the event the Trust is terminated
following the distribution of all payments and benefits called for herein, from
the date of such termination of the Trust and until the final distribution of
the remaining Trust assets, if any, the Trustee shall continue to have all the
powers provided under this Trust Agreement that are necessary or desirable for
the orderly liquidation and distribution of the Trust.

        9.2. Duration. This Trust shall continue in full force and effect for
the maximum period of time permitted by law and in any event until the
expiration of twenty-one years after the death of the last surviving person who
was living at the time of execution hereof who at any time becomes a Participant
in the Plan, unless this Trust is sooner terminated in accordance with this
Trust Agreement.

                                       9
<PAGE>

                                    ARTICLE X
                                  MISCELLANEOUS

        10.1. Emergencies and Delegation.

               (a) In case of an emergency, the Trustee may act in the absence
of directions from any other person having the power and duty to direct the
Trustee with respect to the matter involved and shall incur no liability in so
acting.

               (b) By written notice to the Trustee, the Company may authorize
the Trustee to act on matters in the ordinary course of the business of the
Trust or on specific matters upon the signature of its delegate.

        10.2. Expenses and Taxes.

               (a) The Company, or at its option, the Trust, shall quarterly pay
the Trustee its reasonable expenses in administering the Trust and reasonable
compensation for its services as Trustee at a rate to be agreed upon by the
parties to this Trust Agreement. Such expenses and Trustee compensation shall
constitute a charge upon the Trust, if not paid by the Company.

               (b) Reasonable counsel fees, reasonable costs, expenses and
charges of the Trustee incurred or made in the performance of its duties,
expenses relating to investment of the Trust such as broker's commissions, stamp
taxes, and similar items and all taxes of any and all kinds that may be levied
or assessed under existing or future laws upon or in respect to the Trust or the
income thereof, and the Trustee's charges for issuing distributions to
Participants, Beneficiaries or their representatives shall be paid from, and
shall constitute a charge upon the Trust, if not paid by the Company.

               (c) The Company shall pay any federal, state or local taxes
imposed on the Trust, or any part thereof, and/or the income therefrom. In the
event any Participant or Beneficiary is determined to be subject to federal
income tax on any amount under this Trust Agreement prior to the time of payment
hereunder to such Participant or Beneficiary, the entire amount determined to be
so taxable shall, at the Company's direction, be distributed by the Trustee to
such Participant or Beneficiary from the Trust. For the above purposes, a
Participant or Beneficiary shall be determined to be subject to federal income
tax with respect to the Trust upon the earlier of:

                      (i) a final determination by the United States Internal
Revenue Service ("IRS") addressed to the Participant or Beneficiary which is not
appealed to the courts; or

                      (ii) an opinion of legal counsel designated in writing by
the Company, addressed to the Company and the Trustee, that, by reason of
Treasury Regulations, amendments to the Code, published IRS rulings, court
decisions or other substantial precedent, amounts hereunder subject the
Participant or Beneficiary to federal income tax prior to distribution. The
Company shall undertake at its discretion and at its sole expense to defend any
tax claims described herein which are asserted by the IRS against any
Participant or Beneficiary relating to

                                       10
<PAGE>

participation in the Trust prior to the distribution of benefits, including
attorney fees and costs of appeal, and shall have the sole authority to
determine whether or not to appeal any determination made by the IRS or by a
lower court.

        10.3. Third Parties.

               (a) No person dealing with the Trustee shall be required to
follow the application of money paid or money loaned to the Trustee nor inquire
as to whether the Trustee has complied with the requirements hereof.

               (b) In any judicial or administrative proceedings, only the
Company and the Trustee shall be necessary parties and no Participant or other
person having or claiming any interest in the Trust shall be entitled to any
notice or service of process (except as required by law). Any judgment, decision
or award entered in any such proceeding or action shall be conclusive upon all
interested persons.

        10.4. Binding Effect; Successor Corporation. This Trust Agreement shall
be binding upon and inure to the benefit of any successor to the Company or its
business as the result of merger, consolidation, reorganization, transfer of
assets or otherwise and of any subsequent successor thereto. In the event of any
such merger, consolidation, reorganization, transfer of assets or other similar
transaction, the successor to the Company or its business or any subsequent
successor thereto shall promptly notify the Trustee in writing of its
successorship, and shall comply with the requirements of Section 4.6(a) to the
extent applicable.

        10.5. Relation to Plan. This Trust Agreement and the Plan shall be read
and construed together. Whenever in the Plan it is provided that the Trustee
shall act as therein prescribed, the Trustee shall be and is hereby authorized
and empowered to do so for all purposes as fully as though specifically so
provided herein or so directed by the Company.

        10.6. Partial Invalidity. If any provision of this Trust Agreement is
held to be illegal or invalid for any reason, such illegality or invalidity
shall not affect the remaining portions of this Trust Agreement, unless the
Company, and, following a Change in Control, a two-thirds majority of all
Participants, agree that such illegality or invalidity prevents accomplishment
of the objectives and purposes of this Trust Agreement and the Plan. In the
event of any such holding, the Company and Trustee will immediately amend this
Trust Agreement as necessary to remedy any such defect.

        10.7. Construction. This Trust Agreement shall be construed,
administered and enforced according to the Code under the laws of the State of
California, fairly and equitably in accordance with the purposes of the Plan.

        10.8. Notices. Any notice, report, demand or waiver required or
permitted hereunder shall be in writing, shall be deemed received upon the date
of delivery if given personally or, if given by mail or facsimile transmission,
upon the receipt thereof, and shall be given personally, by facsimile or by
prepaid registered or certified mail, return receipt requested, addressed as
follows.

                                       11
<PAGE>

        If to the Company, to:

                             SPARTA, Inc.
                             23041 Avenida de la Carlota, Suite 400
                             Laguna Hills, California 92653
                             Attention: Chief Financial Officer

                             Facsimile No.: (714) 770-4632

        If to the Trustee, to:

                             Jerry R. Fabian
                             23041 Avenida de la Carlota, Suite 400
                             Laguna Hills, California 92653

                             Facsimile No.: (714) 770-4632

        If to a Participant or Beneficiary, to the last mailing address provided
to the Trustee with respect to such individual; provided, however, that if any
party or his or its successor shall have designated a different address by
notice to the other parties, then to the last address so designated.

                                   ARTICLE XI
             DISTRIBUTIONS IN THE EVENT OF INSOLVENCY OF THE COMPANY

        11.1. Assets Subject to Creditors' Claims. Notwithstanding any other
provisions of this Trust Agreement, at all times during the existence of the
Trust, the assets of the Trust shall be subject to and may be applied under
federal and state law in the event of the Insolvency of the Company to satisfy
the claims of any and all general creditors of the Company and of each
subsidiary of the Company whose employees are approved for participation in the
Plan under the terms thereof. For purposes of this Article XI, the term
"Company" shall refer to SPARTA, Inc. and to each such participating subsidiary.

        11.2. Insolvency. For purposes of this Trust, the Company shall be
considered Insolvent if it is unable to pay its debts as they become due or if
it is subject to a pending proceeding as a debtor under the U.S. Bankruptcy
Code.

        11.3. Duties on Insolvency. The Board of Directors and Chief Executive
Officer of SPARTA, Inc. shall have the duty to inform the Trustee in writing in
the event of the Company's Insolvency, and also to provide notice (after the
Company has become Insolvent) if it ceases to be Insolvent. The Trustee shall
suspend all benefit payments upon receipt of such notice of Insolvency from the
Board of Directors or Chief Executive Officer of the Company, or upon receipt of
a written notice alleging that the Company is Insolvent from a receiver, trustee
in bankruptcy, custodian or person claiming to be a creditor of the Company, or
upon receipt of a copy of proceedings concerning the Company as a debtor under
the U.S. Bankruptcy Code. Unless the Trustee has actual knowledge of the
Company's Insolvency or receives the aforesaid

                                       12
<PAGE>

actual written notice of the Company's Insolvency, the Trustee shall be under no
duty of inquiry as to the Company's solvency or Insolvency.

        11.4. Determination of Insolvency. Upon receipt of the aforesaid written
notice of the Company's Insolvency, the Trustee shall notify the Company, and
the Company, within thirty (30) days of receipt of such notice, shall engage an
arbitrator (the "Arbitrator") acceptable to Trustee, from the American
Arbitration Association to determine the Company's solvency or Insolvency. The
Company shall cooperate fully and assist the Arbitrator, as may be requested by
the Arbitrator, in such determination and shall pay all costs relating to such
determination. The Arbitrator shall notify the Company and Trustee separately by
registered mail of its findings. If the Arbitrator determines that the Company
is solvent or if once found Insolvent the Company is no longer Insolvent, the
Trustee shall resume holding the Trust assets for the benefit of the Plan
Participants or Beneficiaries and may make any distributions called for under
this Trust Agreement, including any amounts which should have been distributed
during the period when the Trustee suspended distributions in response to a
notice of the Company's Insolvency, including earnings (or losses) on such
suspended distributions. If the Arbitrator determines that the Company is
Insolvent or is unable to make a conclusive determination of the Company's
Insolvency, the Trustee shall continue to retain the assets of the Trust until
the Company's status of solvency or Insolvency is decided by a court of
competent jurisdiction or it distributes all or a portion of the Trust assets to
any duly appointed receiver, trustee in bankruptcy, custodian or to the
Company's general creditors, but only as such distribution is ordered by a court
of competent jurisdiction. If a court of competent jurisdiction orders
distribution of only part of the Trust assets and does not specify the manner in
which Trust assets are to be liquidated, the Trustee shall liquidate Trust
assets as follows:

               (a) If such liquidation is ordered prior to a Change in Control,
as directed by the Company; or

               (b) If such liquidation is ordered after a Change in Control, as
determined by the Trustee in its sole discretion. If the Company fails to
provide instructions under subparagraph (a) above as to the manner of
liquidation within five (5) business days prior to the date the Trustee is
required to comply with the court's order, the Trustee shall liquidate the Trust
assets in such manner as the Trustee shall determine in its sole discretion. The
Trustee shall not be liable for any damages resulting from the Trustee's
exercise in good faith of its power to liquidate assets as provided in this
paragraph.

               The Trustee shall have no liability for relying upon the
determination of the Arbitrator as to the Company's solvency or Insolvency. The
Trustee may in all events rely on such evidence concerning the Company's
solvency as may be furnished to the Trustee and that provides the Trustee and
Arbitrator with a reasonable basis for making a determination concerning the
Company's solvency.

                                       13
<PAGE>

        Executed at Laguna Hills, California, the day and year first written
above.

                                        TRUSTEE

                                        ______________________________________
                                        JERRY R. FABIAN

                                        SPARTA, INC.

                                        By:    _______________________________

                                        Title: _______________________________

                                       14

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