Document:

<PAGE>

                                                                    Exhibit 10.6

                              HEWITT ASSOCIATES LLC

                                 FIRST AMENDMENT
                           TO NOTE PURCHASE AGREEMENT

                                   $15,000,000
                     7.94% Senior Notes, Series A, Tranche 1
                               due March 30, 2007

                                   $35,000,000
                               8.08% Senior Notes,
                     Series A, Tranche 2 due March 30, 2012

                                                       Dated as of June 15, 2000

To the Holders of the Senior Notes,
    Series A, of Hewitt Associates LLC
    Named in the Attached Schedule I

Ladies and Gentlemen:

         Reference is made to the Note Purchase Agreement dated as of March 15,
2000 among Hewitt Associates LLC, a limited liability company organized under
the laws of Illinois (the "Company"), and each of the Purchasers named in
Schedule A thereto (the "Note Agreement"), pursuant to which the Company issued
$15,000,000 aggregate principal amount of its 7.94% Senior Notes, Series A,
Tranche 1, due March 30, 2007 (the "Series A Tranche 1 Notes") and $35,000,000
aggregate principal. amount of its 8.08% Senior Notes, Series A, Tranche 2, due
March 30; 2012 (the "Series A Tranche 2 Notes" and together with the Series A
Tranche 1 Notes, the "Series A Notes"). You are referred to herein individually
as a "Holder" and collectively as the "Holders." Capitalized terms used and not
otherwise defined in this Amendment shall have the meanings ascribed to them in
the Note Agreement.

         In connection with its issuance of Subsequent Notes, the Company has
requested the modification to Section 1.2 of the Note Agreement. In addition,
the Company has requested the modification of the representation contained in
Section 5.12(d) of the Note Agreement to correct an error. The Holders are
willing to grant an amendment on the terms and conditions hereinafter set forth.
In consideration of the premises and for good and valuable consideration, the
receipt and sufficiency of which are acknowledged, the Company and the Holders
agree as follows:

1.       AMENDMENTS

         1.1  Amendment of Section 1.2. Section 1.2 of the Note Agreement is
              ------------------------
amended to read in its entirety as follows:

<PAGE>

         "1.2.  Subsequent Series.

                           Subsequent series of notes ("Subsequent Notes") may
         be issued pursuant to Supplemental Note Purchase Agreements as provided
         in Section 2.2 in an aggregate principal amount not to exceed
         $50,000,000, shall be sequentially identified as "Series B Notes," etc.
         and shall be in the aggregate principal amount, be dated, bear
         interest, be subject to required and optional prepayments and shall
         mature as provided in the Supplemental Note Purchase Agreement pursuant
         to which they are issued, and shall be substantially in the form set
         out in Exhibit 2. The Series A Notes and the Subsequent Notes are
         collectively referred to as the "Notes," such term to include any such
         notes issued in substitution therefor pursuant to Section 13 of this
         Agreement."

         1.2    Amendment of Section 5.12. Section 5.12(d) of the Note Agreement
                -------------------------
is amended to read in its entirety as follows:

                           "(d)  The expected postretirement benefit obligation
         (determined as of the -last day of the Company's most recently ended
         fiscal year in accordance with Financial Accounting Standards Board
         Statement No. 106, without regard to liabilities attributable to
         continuation coverage mandated by section 4980B of the Code) of the
         Company and its Subsidiaries does not exceed $9,000,000."

2.       REAFFIRMATION; ETC.

         2.1    Reaffirmation of Note Agreement. The Company reaffirms its
                -------------------------------
agreement to comply with each of the covenants, agreements and other provisions
of the Note Agreement and the Series A Notes, as amended by this Amendment.

         2.2    No Default or Event of Default.  The Company represents and
                ------------------------------
warrants that no Default or Event of Default has occurred and is continuing or
will occur as a result of the execution of this Amendment.

         2.3    Authorization. The execution, delivery and performance by the
                -------------
Company of this Amendment have been duly authorized by all necessary corporate
action and, except as provided herein, do not require any registration with,
consent or approval of, notice to or action by, any Person (including any
Governmental Authority) in order to be effective and enforceable. Each of the
Note Agreement and this Amendment constitutes the legal, valid and binding
obligations of the Company, enforceable against it in accordance with its
respective terms, except as such enforceability may be limited by (i) applicable
bankruptcy, insolvency, reorganization, moratorium or other similar laws
affecting the enforcement of creditors' rights generally and (ii) general
principles of equity (regardless of whether such enforceability is considered in
a proceeding in equity or at law).

3.       EFFECTIVE DATE

         This Amendment shall become effective as of the date set forth above
upon satisfaction of each of the following conditions:

                                       -2-

<PAGE>

         3.1  Consent of Requisite Holders. Each of the Holders of the Series A
              ----------------------------
Notes outstanding shall have executed counterparts of this Amendment.

         3.2  Expenses.  The Company shall have paid all fees and expenses of
              --------
special counsel to the Holders in connection with this Amendment.

4.       MISCELLANEOUS

         4.1  Ratification. Except as expressly amended, modified, deleted or
              ------------
added to hereby, all of the terms and conditions of the Note Agreement, the
Series A Notes and all other documents relating to the Note Agreement remain in
full force and effect, and the parties hereto expressly reaffirm and ratify
their respective obligations thereunder.

         4.2  Reference to and Effect on the Note Agreement. Upon the
              ---------------------------------------------
effectiveness of this Amendment, each reference in the Note Agreement and in
other documents describing or referencing the Note Agreement to the "Agreement,"
"Note Agreement," "hereunder," "hereof," "herein," or words of like import
referring to the Note Agreement, shall mean and be a reference to the Note
Agreement, as amended hereby.

         4.3  Binding Effect. This Amendment shall be binding upon and inure to
              --------------
the benefit of the respective successors and assigns of the parties hereto.

         4.4  Governing Law. This Amendment shall be governed by and construed
              -------------
in accordance with Illinois law.

         4.5  Counterparts.  This Amendment may be executed in any number of
              ------------
counterparts, each executed counterpart constituting an original, but altogether
only one instrument.

                                       -3-

<PAGE>

         If you are in agreement with the foregoing, please sign the
accompanying counterpart of this Amendment and return it to the Company,
whereupon the foregoing shall become a binding agreement between you and the
Company upon satisfaction of the conditions set forth in Section 3 of this
Amendment.

                                 HEWITT ASSOCIATES LLC

                                 By:  /s/ C. Lawrence Connolly, III
                                      -----------------------------------------
                                 Name:    C. Lawrence Connolly, III
                                          -------------------------------------
                                 Title:  Principal & Authorized Representative,
                                         --------------------------------------
                                 Assistant Secretary
                                 ---------------------------------------------

The foregoing is hereby agreed to as of the date thereof.

ALLSTATE LIFE INSURANCE COMPANY

By:  /s/ Robert B. Bodett
     --------------------
Name:_____________________________________

By:  /s/ David Walsh
     ----------------
Name:_____________________________________

              Authorized Signatories

ALLSTATE LIFE INSURANCE COMPANY OF
NEW YORK

By:  /s/ Robert B. Bodett
     --------------------
Name:_____________________________________

By:  /s/ David Walsh
     ---------------
Name:_____________________________________

              Authorized Signatories

                                      S-1

<PAGE>

MASSACHUSETTS MUTUAL LIFE
INSURANCE COMPANY

By:  David L. Babson & Company Inc., as
     Investment Advisor

By:  /s/ Mark A. Ahmed
     -----------------
Name:____________________________________
Title:  Managing Director
        -----------------

C.M. LIFE INSURANCE COMPANY

By:  David L. Babson & Company Inc. as
     Investment Sub-Adviser

By:  /s/ Mark A. Ahmed
     -----------------
Name:_____________________________________
Title:  Managing Director
        -----------------

PACIFIC LIFE INSURANCE COMPANY

By:  /s/ Cathy Schwartz
     ------------------
Name:_____________________________________
Title:  Assistant Vice President
        ----------------------------------

By:  /s/ Audrey L. Milfs
     -------------------

Title: Corporate Secretary
       -------------------

PHOENIX HOME LIFE MUTUAL INSURANCE
COMPANY

By:  /s/ John H. Beers
     -----------------

Name:_____________________________________
Title:  Vice President
        ----------------------------------

                                      S-2

<PAGE>

                                   SCHEDULE I
<TABLE>
<CAPTION>
                                                                      Tranche I        Original
Name of Holder                                                           Note      Principal Amount
--------------                                                           ----      ----------------
<S>                                                                     <C>          <C>
Allstate Life Insurance Company                                         AIR-1         $5,000,000

Allstate Life Insurance Company of New York                             AIR-2          4,000,000

Citibank, Federal Savings Bank as Collateral Agent and                  AIR-3          6,000,000
     Trustee under the Security and Trust Agreement Dated as
     of September 1, 1993 (Northbrook Life Insurance Company,
     Secured Party and Beneficiary)
</TABLE>

                                                    Tranche I       Original
Name of Holder                                         Note     Principal Amount
--------------                                         ----     ----------------
Massachusetts Mutual Life Insurance Company           A2R-1        8,700,000

Massachusetts Mutual Life Insurance Company           A2R-2        1,900,000

Massachusetts Mutual Life Insurance Company           A2R-3        2,600,000

C.M. Life Insurance Company                           A2R-4        1,800,000

Mac & Co./1/                                          A2R-5       10,000,000

Mac & Co./2/                                          A2R-6        5,000,000

Phoenix Home Life Mutual Insurance Company            A2R-7        5,000,000

__________________
/1/  Nominee for Pacific Life Insurance Company.

/2/  Nominee for Pacific Life Insurance Company.

                                       1

                                   Schedule I<PAGE>

                                                                    Exhibit 10.7

                      SUPPLEMENTAL NOTE PURCHASE AGREEMENT

                                                       Dated as of June 15, 2000
                                                               PPN:  42823# AD 5

To Each of the Purchasers Named
  in the Attached Supplemental
  Purchaser Schedule

Ladies and Gentlemen:

                  Reference is made to the Note Purchase Agreement dated as of
March 15, 2000 between the Company and each of the Initial Purchasers named in
Schedule A thereto (as amended by the First Amendment to Note Purchase Agreement
dated as of June 15, 2000, the "Agreement"). Capitalized terms used but not
defined herein have the meanings set forth in the Agreement.

                  As contemplated by Section 1.2 and Section 2.2 of the
Agreement, the Company agrees with you as follows:

                  A.  Authorization of the Subsequent Notes. The Company has
                      -------------------------------------
authorized the issue and sale of $10,000,000 aggregate principal amount of
Subsequent Notes to be designated as its 8.11% Senior Notes, Series B, due June
30, 2010 (the "Series B Notes"). The Series B Notes will be dated the date of
issue, will bear interest from such date at the rate of 8.11% per annum, payable
semiannually in arrears on June 30 and December 30 in each year, commencing
December 30, 2000, until the principal amount thereof shall become due and
payable and shall bear interest on overdue principal (including any overdue
optional prepayment of principal) and Make-Whole Amount, if any, and, to the
extent permitted by law, on any overdue installment of interest at the rate
specified therein after the due date for payment, whether by acceleration or
otherwise, until paid, and shall be substantially in the form set out in Exhibit
2 to the Agreement, with appropriate insertions to reflect the terms and
provisions set forth herein.

                  B.  Sale and Purchase of Series B Notes. Subject to the terms
                      -----------------------------------
and conditions of the Agreement and herein set forth, the Company will issue and
sell to each of the Supplemental Purchasers, and each Supplemental Purchaser
will purchase from the Company, Series B Notes in the principal amount specified
opposite its respective name in the Supplemental Purchaser Schedule attached as
Schedule A hereto at the purchase price of 100% of the principal amount thereof.
The sale and purchase of the Series B Notes shall occur at the offices of
Gardner, Carton & Douglas, Quaker Tower, Suite 3400, 321 North Clark Street,
Chicago, Illinois 60610 at 9:00 a.m., Chicago time, at a closing (the "Series B
Closing") on July 7, 2000 or on such other Business Day thereafter as may be
agreed upon by the Company and the Supplemental Purchasers. At the Closing the
Company will deliver to each Supplemental Purchaser the Series B Notes to be
purchased by it in the form of a single Note (or such greater number of Series B
Notes in denominations of at least $500,000 as such Purchaser may request) dated
the date of the

<PAGE>

Series B Closing and registered in its name (or in the name of its nominee),
against delivery by such Purchaser to the Company or its order of immediately
available funds in the amount of the purchase price therefor by wire transfer of
immediately available funds for the account of the Company (as specified in a
notice to each Supplemental Purchaser at least three Business Days prior to the
date of the Series B Closing).

                  C.  Conditions of Series B Closing. The obligation of each
                      ------------------------------
Supplemental Purchaser to purchase and pay for the Series B Notes to be
purchased by it at the Series B Closing is subject to the satisfaction, prior to
or at the Series B Closing, of the conditions set forth in Section 4 of the
Agreement.

                  D.  Prepayments. The Series B Notes are subject to prepayment
                      -----------
only pursuant to the required prepayments, if any, specified below and to the
optional prepayments permitted by Section 8.2 of the Agreement.

                  No regularly scheduled prepayments are due
                   on the Notes prior to their stated maturity.

                  E.  Series B Notes Issued Under and Pursuant to Agreement.
                      -----------------------------------------------------
Except as specifically provided above, the Series B Notes shall be deemed to be
issued under and subject to, and to have the benefit of, all of the terms and
conditions of the Agreement as the same may from time to time be amended and
supplemented in the manner provided therein.

                  F.  Representations and Warranties of the Company. The Company
                      ---------------------------------------------
represents and warrants to the Purchasers that each of the representations and
warranties contained in Section 5 of the Agreement is true and correct as of the
date hereof (i) except that all references to "Purchaser" and "you" therein
shall be deemed to refer to the Purchasers hereunder, all references to "this
Agreement" shall be deemed to refer to the Agreement as supplemented by this
Supplement, all references to "Notes" therein shall be deemed to include the
Series B Notes, and (ii) except for changes to such representations and
warranties, or the Schedules referred to therein, that are set forth in the
attached Schedule 5.

                  G.  Representations of the Purchasers. Each Purchaser confirms
                      ---------------------------------
to the Company that the representations set forth in Section 6 of the Agreement
are true and correct as to such Purchaser.

                                      -2-

<PAGE>

                  The execution by the Supplemental Purchasers shall constitute
a contract between the Company and the Supplemental Purchasers for the uses and
purposes set forth above. By its acceptance hereof, each Supplemental Purchaser
shall also be deemed to have accepted and agreed to the terms and provisions of
the Agreement as in effect on the date hereof.

                                 HEWITT ASSOCIATES LLC

                                 By: /s/ C. Lawrence Connolly, III
                                     ------------------------------------------
                                 Name:   C. Lawrence Connolly, III
                                       ----------------------------------------
                                 Title:  Principal & Authorized Representative
                                        ---------------------------------------
                                         Assistant Secretary

The foregoing is agreed to
as of the date thereof.

MASSACHUSETTS MUTUAL LIFE
INSURANCE COMPANY
by David L. Babson and Company Inc., as
Investment Adviser

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

C.M. LIFE INSURANCE COMPANY
by David L. Babson and Company Inc., as
Investment Sub-Adviser

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

                                      S-1

<PAGE>

                  The execution by the Supplemental Purchasers shall constitute
a contract between the Company and the Supplemental Purchasers for the uses and
purposes set forth above. By its acceptance hereof, each Supplemental Purchaser
shall also be deemed to have accepted and agreed to the terms and provisions of
the Agreement as in effect on the date hereof.

                                      HEWITT ASSOCIATES LLC

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

The foregoing is agreed to
as of the date thereof.

MASSACHUSETTS MUTUAL LIFE
INSURANCE COMPANY
By: David L. Babson & Company Inc.
    as Investment Adviser

By: /s/ John B. Wheeler
    -------------------------------------
Name:          John B. Wheeler
      -----------------------------------
Title:         Managing Director
       ----------------------------------

C.M. LIFE INSURANCE COMPANY
By:  David L. Babson & Company Inc.
     as Investment Sub-Adviser

By: /s/ John B. Wheeler
    -------------------------------------
Name:          John B. Wheeler
      -----------------------------------
Title:         Managing Director
       ----------------------------------

                                      S-1

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