Document:

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                                                                   Exhibit 10.17

                              FIRST AMENDMENT TO

                          AECOM TECHNOLOGY CORPORATION

               MANAGEMENT SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN

                             EFFECTIVE JULY 1, 1998

THIS AMENDMENT, by AECOM Technology Corporation, hereinafter sometimes referred
to as the "Company," is made with reference to the following facts:

Effective July 1, 1998, AECOM Technology Corporation adopted the AECOM
Technology Corporation Management Supplemental Executive Retirement Plan,
Effective July 1, 1998 which reserves to the Board of Directors of AECOM
Technology Corporation the right to amend said Plan (Section 4.1 thereof). The
Company has executed this First Amendment for the purpose of amending said Plan
in the manner hereinafter provided.

NOW, THEREFORE, the AECOM Technology Corporation Management Supplemental
Executive Retirement Plan, Effective July 1, 1998 is hereby amended as follows,
effective January 1, 2002:

                                       I.

Section 2.13 is hereby amended in its entirety to read as follows:

     "2.13 Participant refers to an employee of the Company who (a) is a member
           -----------
           of a select group of management or highly compensated employees
           (within the meaning of Section 201(2) of ERISA), and (b) has ceased
           to participate in the AECOM Pension Plan pursuant to the provisions
           of Section 3.1(a)(2) thereof. The Committee shall maintain a record
           of Participants."

                                       II.

Section 2.20 is hereby amended in its entirety to read as follows:

     "2.20 Total AECOM Pension Plan Benefit means the annual benefit the
           Participant would have received under the AECOM Pension Plan, if the
           amendments to the AECOM Pension Plan, effective July 1, 1998 and
           January 1, 2002, terminating participation for Members eligible for
           the AECOM Technology Corporation Incentive Compensation Plan, had not
           been adopted."

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IN WITNESS WHEREOF, the Company has caused this First Amendment to be executed
as of January 1, 2002.

                                                    AECOM Technology Corporation

                                            By:  /s/ Eric Chen
                                               ---------------------------------

                                            Title:     Vice President
                                                  ------------------------------

                                            Date:     December 7, 2001
                                                 -------------------------------

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                                                                   Exhibit 10.18

                          AECOM TECHNOLOGY CORPORATION
                               EXCESS BENEFIT PLAN

                             Effective July 1, 1996

                                1997 Restatement
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                          AECOM TECHNOLOGY CORPORATION
                              EXCESS BENEFIT PLAN

I.   Establishment and Purpose

     1.1   Effective July 1, 1996, AECOM Technology Corporation established this
           Excess Benefit Plan ("Plan") solely to restore benefits which are
           lost under the Company's Pension Plan due to the operation of
           Sections 401(a)(17) and 415 of the Code. The 401(a)(17) benefit
           restoration feature of this Plan is intended to be an unfunded plan
           maintained by the Company primarily for the purpose of providing
           deferred compensation for a select group of management or highly
           compensated employees described in Section 201(2) of ERISA. The 415
           benefit restoration feature of the Plan is intended to be an "excess
           benefit plan" within the meaning of Title I of ERISA.

     1.2   Effective November 20, 1997, the Plan was restated to reflect the
           expansion of Beneficiaries of pre-Retirement Death Benefits and
           elimination of the 50% joint & survivor annuity.

II.  Definitions

     2.1   Actuarial Equivalent means a benefit of equivalent value, calculated
           --------------------
           using the assumptions used in the AECOM Pension Plan; however, when
           calculating an Actuarial Equivalent lump sum benefit under Section
           3.5(b)(1), 3.6, or 3.7 or the guaranteed installment options under
           Section 3.5(b)(2), mortality shall be determined using the 1983 GAM
           table and the interest rate shall be equal to the sum of the rate on
           10-year U.S. Treasury notes in effect on the first day of the Plan
           Year preceding or coincident with the Retirement Date plus 50 basis
           points.

     2.2   AECOM Pension Plan means the AECOM Technology Corporation Pension
           ------------------
           Plan, as amended from time to time.

     2.3   AECOM Pension Plan Benefit means the annual benefit payable to the
           --------------------------
           Participant under the AECOM Pension Plan determined as though
           benefits were being paid as a single life annuity commencing on the
           Participant's Retirement Date.

     2.4   AECOM SIP means the AECOM Technology Corporation Stock Investment
           ---------
           Plan, a qualified plan with a 401(k) feature, as amended from time to
           time.

     2.5   AECOM SPP means the AECOM Technology Corporation Stock Purchase Plan,
           ---------
           a nonqualified deferred compensation plan, as amended from time to
           time.

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     2.6   Beneficiary means the person(s) designated by the Participant in
           -----------
           writing to receive the remaining installments under the five- or
           ten-year guaranteed installment option if the Participant dies before
           receiving all installments, or to receive the pre-retirement Death
           benefit described in Section 3.6. The Participant may change the
           Beneficiary at any time by submitting a signed written designation to
           the Committee. If the designated Beneficiary fails to survive the
           Participant and the Participant has not designated a successor
           Beneficiary, the remaining installment payments shall be paid to the
           Participant's surviving spouse, or if there is no spouse, his
           surviving descendants by right of representation or if there are
           none, his estate. If the Beneficiary survives the Participant, but
           dies before receiving all remaining installments, the remaining
           installments shall be paid to the Beneficiary's estate.

     2.7   Board of Directors means the Board of Directors of the Company.
           ------------------

     2.8   Code means the Internal Revenue Code of 1986, as amended from time to
           ----
           time.

     2.9   Committee means the Pension Committee or such other committee
           ---------
           designated or appointed by the Board of Directors to administer the
           Plan.

     2.10  Company means AECOM Technology Corporation.
           -------

     2.11  Disability has the same meaning as under the AECOM Pension Plan.
           ----------

     2.12  Effective Date means July 1, 1996.
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     2.13  ERISA means the Employee Retirement Income Security Act of 1974, as
           -----
           amended from time to time.

     2.14  Normal Retirement Age has the same meaning as under the AECOM Pension
           ---------------------
           Plan.

     2.15  Participant refers to an employee of the Company who is credited with
           -----------
           an Hour of Service under the AECOM Pension Plan on or after the
           Effective Date, whose AECOM Pension Plan Benefit is limited by Code
           Section 401(a)(17) or 415, and has been selected by the Board of
           Directors to participate in this Plan. The Committee shall maintain a
           record of Participants.

     2.16  Plan Administrator means the Committee.
           ------------------

     2.17  Plan Year means the twelve-month period ending on September 30. The
           ---------
           first Plan Year begins on July 1, 1996, and ends on September 30,
           1996.

     2.18  Retirement Date means the first day of the month following the later
           ---------------
           of (a) the Participant's earliest early retirement date under the
           AECOM Pension Plan and (b)

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           the Participant's termination of employment for any reason, including
           death.

     2.19  Spouse means the person to whom the Participant is married on his
           ------
           Retirement Date or on his date of death, if earlier.

     2.20  Unlimited Pension Plan Benefit means a Participant's AECOM Pension
           ------------------------------
           Plan Benefit calculated without regard to Code Sections 401(a)(17)
           and 415.

     2.21  Vested means the Participant has a vested employer-provided accrued
           ------
           benefit under the AECOM Pension Plan.

III. Retirement and Death Benefits

     3.1   Normal Retirement Benefits
           --------------------------

           A Participant who terminates employment with the Company on or after
           attaining Normal Retirement Age shall be entitled to an annual
           benefit which is equal to

           (a)  the Participant's Unlimited Pension Plan Benefit minus

           (b)  the Participant's AECOM Pension Plan Benefit.

     3.2   Early Retirement Benefits
           -------------------------

           A Participant who terminates employment before attaining Normal
           Retirement Age and who is Vested shall be entitled to an annual
           benefit which is equal to the benefit under Section 3.1, reduced
           1/144th for each calendar month (up to 36 months) by which the
           Participant's age on his Retirement Date is less than 65 and reduced
           1/128th for each calendar month (up to 84 months) by which the
           Participant's age on his Retirement Date is less than 62.

     3.3   Termination of Employment
           -------------------------

           (a)  A Participant who terminates employment with the Company prior
                to his attaining Normal Retirement Age and who is not Vested
                shall not be entitled to any benefits under this Plan.

           (b)  A Participant whose employment is terminated for cause shall not
                be entitled to any benefits under the Plan. A termination is
                "for cause" if the Participant is terminated for reasons related
                to the commission by the Participant in the course of employment
                of any material act of dishonesty, the disclosure by the
                Participant of any confidential information or the commission by
                the Participant of any act of gross carelessness or willful

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                misconduct.

     3.4   Rules Regarding Reductions
           --------------------------

           For purposes of calculating the amounts under Section 3.1, the
           following rules shall apply:

           (a)  Any portion of the Participant's benefits under this Plan or the
                AECOM Pension Plan which is payable (or has been paid) to
                another person pursuant to a court order shall be treated as
                payable to the Participant.

           (b)  The Participant's benefit under the AECOM Pension Plan shall be
                determined without regard to whether benefits have or have not
                commenced and without regard to the actual form of payment
                elected by the Participant.

     3.5   Form of Benefit
           ---------------

           (a)  Unless a Participant makes an election pursuant to this Section,
                the Participant's benefit under Section 3.1, 3.2 or 3.3, as the
                case may be, shall be paid in equal monthly installments over
                the Participant's life, commencing on his Retirement Date and
                ending with the last payment made before his death.

           (b)  The Participant may elect to receive his benefit in one of the
                following forms:

                (1)  A lump sum paid on his Retirement Date which is the
                     Actuarial Equivalent of the benefit described in paragraph
                     (a).

                (2)  A five- or ten-year term certain, as the Participant
                     elects, which is the Actuarial Equivalent of the benefit
                     described in paragraph (a), paid in equal annual
                     installments commencing on the Retirement Date. If the
                     Participant dies after terminating employment, but before
                     receiving all installment payments, the remaining
                     installments will be paid as they come due to the
                     Participant's Beneficiary.

                (3)  A 50% joint and survivor annuity which is the Actuarial
                     Equivalent of the benefit described in paragraph (a). Under
                     this form, the Participant receives a reduced monthly
                     payment for life. On his death, his surviving Spouse will
                     receive a monthly benefit equal to 50% of the benefit the
                     Participant was receiving. The Participant's benefit will
                     commence on his Retirement Date and end with the last
                     payment made before his death. The Spouse's

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                     survivor annuity will commence on the first day of the
                     month following the Participant's death and end with the
                     last payment made before the Spouse's death. If the Spouse
                     does not survive the Participant, no survivor benefits will
                     be paid. If the Participant is not married on his
                     Retirement Date, his election under this subparagraph will
                     be deemed revoked and unless his election specified an
                     alternative default choice, his benefit will be paid
                     pursuant to paragraph (a).

           (c)  The Participant's election must be made in writing within 30
                days of the date he is notified by the Company of his
                participation in the Plan. The election is irrevocable.

           (d)  Notwithstanding the foregoing, if the Participant is also a
                participant in the Supplemental Executive Retirement Plan
                ("SERP"), his benefit under this Plan shall be paid in the same
                form as his benefit under SERP.

     3.6   Pre-Retirement Death Benefits
           -----------------------------

           If the Participant dies while employed by the Company and after
           becoming Vested, his Beneficiary  shall receive  the Actuarial
           Equivalent of the Participant's benefit under the Plan.

     3.7   Small Benefit Cashout
           ---------------------

           Notwithstanding he foregoing provisions or the Participant's election
           under Section 3.5, if the Actuarial Equivalent lump sum value of a
           Participant's benefit (or the survivor's benefit under Section 3.6)
           at his Retirement Date does not exceed $3,500, the benefit shall be
           paid in a single lump sum in lieu of all other benefits otherwise
           payable hereunder.

IV.  Amendment and Termination

     4.1   Amendment
           ---------

           The Board of Directors reserves the right in its discretion to amend
           this Plan at any time in whole or in part, provided, however, that no
           amendment shall result in the forfeiture of any Participant's Plan
           benefits earned prior to the date the Board adopts the amendment. The
           Company shall notify Participants (and the Spouses of deceased
           Participants) of any amendments which affect the amount or timing of
           benefits within 90 days of the effective date of such amendments.

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     4.2   Termination
           -----------

           The Board of Directors may terminate the Plan at any time.
           Termination shall not result in the forfeiture of any Participant's
           benefits earned prior to the date the Board adopts a resolution
           terminating the Plan.

V.   Administration

     5.1   This Plan shall be adopted by the Company and shall be administered
           by the Committee.

     5.2   The Committee shall have the sole authority, in its discretion, to
           adopt, amend and rescind such rules and regulations as it deems
           advisable in the administration of the Plan, to construe and
           interpret the Plan, and the rules and regulations, and to make all
           other determinations and interpretations of the Plan. All decisions,
           determinations, and interpretations of the Committee shall be final
           and binding on all persons, except as otherwise provided by law.
           Committee members who are Participants shall abstain from voting on
           any Plan matters that would cause them to be in constructive receipt
           of benefits under the Plan. The Committee may delegate its
           responsibilities as it sees fit.

     5.3   If a Participant or Spouse believes benefits have been incorrectly
           calculated or denied, such person may file a claim with the
           Committee. The Committee shall follow the claims procedures in the
           AECOM Pension Plan.

     5.4   All Plan administrative expenses shall be paid by the Company.

     5.5   The Company shall indemnify the Committee and each Committee member
           against any and all claims, losses, damages, expenses (including
           reasonable counsel fees), and liability arising from any action,
           failure to act, or other conduct in the member's official capacity,
           except when due to the individual's own gross negligence or willful
           misconduct.

VI.  General Provisions

     6.1   No Funding Obligation. The amounts accrued by a Participant hereunder
           ---------------------
           are not held in a trust or escrow account and are not secured by any
           specific assets of the Company or in which the Company has an
           interest. This Plan shall not be construed to require the Company to
           fund any of the benefits provided hereunder nor to establish a trust
           for such purpose. The Company may make such arrangements as it
           desires to provide for the payment of benefits. Neither the
           Participant, the Spouse nor the Participant's estate shall have any
           rights against the Company with respect to any portion of the
           Participant's benefits except as a general unsecured creditor of the
           Company. No Participant has an interest in his benefits until the
           Participant actually receives payment.

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     6.2   Non-alienation of Benefits. No benefit under this Plan may be sold,
           --------------------------
           assigned, transferred, conveyed, hypothecated, encumbered,
           anticipated, or otherwise disposed of, and any attempt to do so shall
           be void. No such benefit shall, prior to receipt thereof by a
           Participant or Spouse, be in any manner subject to the debts,
           contracts, liabilities, engagements, or torts of such Participant.

     6.3   Limitation of Rights. Nothing in this Plan shall be construed to
           --------------------
           limit in any way the right of the Company to terminate a
           Participant's employment at any time for any reason whatsoever with
           or without cause; nor shall it be evidence of any agreement or
           understanding, express or implied, that the Company (a) will employ a
           Participant in any particular position, (b) will ensure participation
           in any incentive programs, or (c) will grant any awards from such
           programs.

     6.4   Applicable Law.  This Plan shall be construed and its provisions
           --------------
           enforced and administered in accordance with the laws of the State of
           California except as otherwise provided in ERISA.

This Plan is hereby adopted by the Company on this 20th day of Novermber, 1997.

                                         AECOM TECHNOLOGY CORPORATION

                                         By /ILLEGIBLE/

                                         Its ___________________________________

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