Document:

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                                                                   EXHIBIT 10.21

                             AMENDMENT NO. 1 TO THE
                     AMENDED AND RESTATED CREDIT AGREEMENT

                                    Dated as of October 23, 2000

          AMENDMENT NO. 1 TO THE AMENDED AND RESTATED CREDIT AGREEMENT among
ARTHUR D. LITTLE, INC., a Massachusetts corporation (a "Borrower" or "ADL"),
ARTHUR D. LITTLE INTERNATIONAL, INC., a Massachusetts corporation (a "Borrower",
and together with ADL, the "Borrowers"), the banks, financial institutions and
other institutional lenders (the "Initial Lenders") listed on the signature
pages hereof, and CITIBANK, N.A. ("Citibank"), as agent (together with any
successor appointed pursuant to Section 8.06, the "Agent") for the Lenders (as
hereinafter defined)

          PRELIMINARY STATEMENTS:

          (1)  The Borrowers, the Initial Lenders and the Agent have entered
     into an Amended and Restated Credit Agreement dated as of April 25, 2000
     (as amended, supplemented or otherwise modified through the date hereof,
     the "Credit Agreement"). Capitalized terms not otherwise defined in this
     Amendment have the same meanings as specified in the Credit Agreement.

          (2)  The Borrowers and the Lenders have agreed to amend the Credit
     Agreement as hereinafter set forth.

          SECTION 1.  Amendments to Credit Agreement.
          ----------  ------------------------------
          The Credit Agreement is, effective as of the date hereof and subject
to the satisfaction of the conditions precedent set forth in Section 4, hereby
amended as follows:

          (a)  Section 2.06(b)(ii)(C)(y) is amended in full to read as follows:

               "(y) proceeds of the TIME IPO except such proceeds that exceed
          $55,000,000 or are received by or for the account of a Borrower."

          (b)  Section 2.06(b) is amended by adding the following immediately
     after the word "maturity" at the end thereof:

               "; provided that any prepayments pursuant to clause (C)(y) of
          this Section 2.06(b) shall be applied against the principal repayment
          installments set forth in Section 2.03 in inverse order, commencing
          with the principal repayment installment due June 1, 2001."

          (c)  Section 2.06(b)(iii) is deleted in its entirety and the following
     substituted therefor: "Intentionally deleted".
<PAGE>

          (d)  Section 2.02 is amended by adding to the end thereof a new
     subsection (c), to read as follows:

               "(c)  Amendment Fee.  In addition to the fees set forth above,
                     -------------
          ADL shall pay to the Agent for the account of each Lender a
          restructuring fee equal to 2% of such Lender's Commitment as of
          January 15, 2001, payable on January 15, 2001."

          (e)  Section 5.01(m) is amended by deleting the words "In the event
     that the TIME IPO does not occur on or prior to December 31, 2000, the" and
     substituting therefor the word "The".

          (f)  Section 5.01(m)(i) is amended by inserting at the end thereof
     the words "; provided that, in the event the TIME IPO has occurred on or
     prior to December 31, 2000, this Section 5.01(m) shall not apply with
     respect to TIME or its Subsidiaries,"

          SECTION 2.  Conditions of Effectiveness.
          ----------  ---------------------------

          This Amendment shall become effective as of the date first above
written when, and only when, the Agent shall have received (i) counterparts of
this Amendment executed by the Borrowers and all of the Lenders or, as to any of
the Lenders, advice satisfactory to the Agent that such Lender has executed this
Amendment and the consent attached hereto executed by each Subsidiary Guarantor
(ii) evidence to its reasonable satisfaction that the TIME IPO has been
completed and (iii) not later than 5 days after the execution of this Amendment,
payment of all costs and expenses of the Agent or counsel to the Agent due and
payable under Section 9.04 of the Credit Agreement or this Amendment.  This
Amendment is subject to the provisions of Section 9.01 of the Credit Agreement.

          SECTION 3.  Representations and Warranties of the Borrower.
          ----------  ----------------------------------------------

          Each Borrower represents and warrants as follows:

          (a) Each of the Borrowers is a corporation duly organized, validly
     existing and in good standing under the laws of the jurisdiction of its
     organization.

          (b) The execution, delivery and performance by the Borrowers of this
     Amendment, and the consummation of the transactions contemplated hereby,
     are within such Borrower's corporate powers, have been duly authorized by
     all necessary corporate action, and do not contravene (i) such Borrower's
     charter or by-laws or (ii) law or any contractual restriction binding on or
     affecting such Borrower.

          (c) No authorization or approval or other action by, and no notice to
     or filing with, any governmental authority or regulatory body or any other
     third party is required for the due execution, delivery and performance by
     the Borrowers of this Amendment.

          (d) This Amendment has been duly executed and delivered by each
     Borrower.  This Amendment and each of the Loan Documents as amended hereby
     is the legal, valid and binding obligation of each Loan Party party
     thereto, enforceable against such Loan Party in accordance with its terms.
<PAGE>

          (e) The execution, delivery and performance of this Amendment do not
     adversely affect the Liens created under any of the Collateral Documents.

          SECTION 4.  Reference to and Effect on the Credit Agreement and the
          ----------  -------------------------------------------------------
                      Notes.
                      -----

          (a)  On and after the effectiveness of this Amendment, each reference
     in the Credit Agreement to "this Agreement", "hereunder", "hereof" or words
     of like import referring to the Credit Agreement, and each reference in the
     Notes and each of the other Loan Documents to "the Credit Agreement",
     "thereunder", "thereof" or words of like import referring to the Credit
     Agreement, shall mean and be a reference to the Credit Agreement, as
     amended by this Amendment.

          (b)  The Credit Agreement, the Notes and each of the other Loan
     Documents, as specifically amended by this Amendment, are and shall
     continue to be in full force and effect and are hereby in all respects
     ratified and confirmed. Without limiting the generality of the foregoing,
     the Collateral Documents and all of the Collateral described therein do and
     shall continue to secure the payment of all Obligations of the Loan Parties
     under the Loan Documents, in each case as amended by this Amendment.

          (c)  The execution, delivery and effectiveness of this Amendment
     shall not, except as expressly provided herein, operate as a waiver of any
     right, power or remedy of any Lender or the Agent under any of the Loan
     Documents, nor constitute a waiver of any provision of any of the Loan
     Documents.

          SECTION 5.  Costs, Expenses.
          ----------  ---------------

          Each Borrower agrees to pay on demand all costs and expenses of the
Agent in connection with the preparation, execution, delivery and
administration, modification and amendment of this Amendment and the other
instruments and documents to be delivered hereunder (including, without
limitation, the reasonable fees and expenses of counsel for the Agent) in
accordance with the terms of Section 9.04 of the Credit Agreement.

          SECTION 6.  Execution in Counterparts.
          ----------  -------------------------

          This Amendment may be executed in any number of counterparts and by
different parties hereto in separate counterparts, each of which when so
executed shall be deemed to be an original and all of which taken together shall
constitute but one and the same agreement.  Delivery of an executed counterpart
of a signature page to this Amendment by telecopier shall be effective as
delivery of a manually executed counterpart of this Amendment.

           SECTION 7.  Governing Law.
           ----------  -------------
           This Amendment shall be governed by, and construed in accordance
with, the laws of the State of New York.
<PAGE>

          IN WITNESS WHEREOF, the parties hereto have caused this Amendment to
be executed by their respective officers thereunto duly authorized, as of the
date first above written.

                                    ARTHUR D. LITTLE, INC.

                                    By /s/ Frederick McElligott
                                      -------------------------------
                                      Title: Treasurer

                                    ARTHUR D. LITTLE INTERNATIONAL, INC.

                                    By /s/ Frederick McElligott
                                      -------------------------------
                                      Title: Treasurer

                                    CITIBANK, N.A.
                                    as Agent and as Lender

                                    By /s/ Anthony Murphy
                                      -------------------------------
                                      Title: Anthony Murphy

                                    THE CHASE MANHATTAN BANK

                                    By /s/ Roger O'Dell
                                      -------------------------------
                                      Title: Roger O'Dell<PAGE>

                                                                   EXHIBIT 10.22

                               AMENDMENT NO. 1 TO
                  AMENDED AND RESTATED NOTE PURCHASE AGREEMENT

                                    Dated as of October 23, 2000

          AMENDMENT NO. 1 TO THE AMENDED AND RESTATED NOTE PURCHASE AGREEMENT
(the "Note Agreement") between ARTHUR D. LITTLE, INC., a Massachusetts
corporation (the "Company" or "ADL") and the Purchasers listed on Schedule A
thereto (the "Noteholders").

          PRELIMINARY STATEMENTS:

          (1) Capitalized terms not otherwise defined in this Amendment shall
    have the same meanings as specified in the Note Agreement.

          (2) The undersigned Noteholders own all of the issued and outstanding
    Notes.
          (3) The Company and the Noteholders have agreed to amend the Note
    Agreement as hereinafter set forth.

         SECTION 1. Amendments to Note Agreement. The Note Agreement is,
         ---------------------------------------
effective as of the date hereof and subject to the satisfaction of the
conditions precedent set forth in Section 2, hereby amended as follows:

        (a)  Section 8.2(e) is hereby amended to read in full as follows:

               (E) TIME IPO PREPAYMENT.  If the TIME IPO shall occur and the
               proceeds thereof received by the issuer shall exceed $55,000,000,
               the Company shall pay (or cause to be paid) to the holders of the
               Notes an aggregate amount equal to the Noteholder Portion of such
               excess, and such amount shall be applied to the prepayment of the
               Notes (in inverse order of maturity) and accrued interest thereon
               and the Make-Whole Amount in respect of the principal amount so
               prepaid.  Such payment shall be made within two (2) Business Days
               of the closing of the TIME IPO.  If the proceeds of the TIME IPO
               do not exceed $55,000,000, such proceeds need not be applied to
               the prepayment of the Notes except (pursuant to Section 8.2(b))
               to the extent that such proceeds are distributed to the Company
               or ADL International.
<PAGE>

         (b) The portion of the initial sentence of Section 9.6(a) preceding the
     colon is hereby amended to read in full as follows: "The Company shall:"

         (c) The following language is hereby added as a new final paragraph to
     Section 9.6(a): "; provided that if the TIME IPO occurs on or prior to
     December 31, 2000, this Section 9.6(a) shall not apply to TIME or any of
     its Subsidiaries."

         (d) A new Section 9.9 is hereby added to read as follows:

               9.9  AMENDMENT FEE

               On or before January 15, 2001 the Company shall pay to each
               holder of Notes an amendment fee equal to 2% of the outstanding
               principal amount of the Notes held by such holder as of January
               1, 2001.

         SECTION 2. Conditions of Effectiveness. This Amendment shall become
         --------------------------------------
effective as of the date first above written when, and only when (i)
counterparts of this Amendment shall have been duly executed by the Company and
each of the Noteholders and the consent attached hereto has been executed by
each Subsidiary Guarantor; (ii) the Banks shall have entered into an agreement
with the Company to the same effect as this agreement; and (iii) the TIME IPO
shall have been completed.

         SECTION 3. Representations and Warranties of the Company. The Company
         ---------------------------------------------------------
represents and warrants as follows:

          (a) It is a corporation duly organized, validly existing and in good
     standing under the laws of the jurisdiction of its organization.

          (b) Its execution, delivery and performance of this Amendment, and the
     consummation of the transactions contemplated hereby, are within its
     corporate powers, have been duly authorized by all necessary corporate
     action, and do not contravene (i) its charter or by-laws or (ii) law or any
     contractual restriction binding on or affecting it.

          (c) No authorization or approval or other action by, and no notice to
     or filing with, any governmental authority or regulatory body or any other
     third party is required for the due execution, delivery and performance by
     the Company of this Amendment.

          (d) This Amendment has been duly executed and delivered by the
     Company, and the Note Agreement as amended hereby and the Notes are the
     legal, valid and binding obligations of the Company, enforceable in
     accordance with their terms.

          (e) The execution, delivery and performance of this Amendment do not
     adversely affect the Liens created under any of the collateral documents.
<PAGE>

         SECTION 4. Reference to and Effect on the Note Agreement and the Notes.
         -----------------------------------------------------------------------

         (a) On and after the effectiveness of this Amendment, each reference in
the Note Agreement to "this Agreement", "hereunder", "hereof" or words of like
import referring to the Note Agreement, and each reference in the Notes to "the
Note Agreement", "thereunder", "thereof" or words of like import referring to
the Note Agreement, shall mean and be a reference to the Note Agreement, as
amended by this Amendment.

         (b) The execution, delivery and effectiveness of this Amendment shall
not, except as expressly provided herein, operate as an amendment of any terms
of the Note Agreement or a waiver of any right, power or remedy of any
Noteholders.

         SECTION 5. Costs, Expenses. The Company shall pay on demand all costs
         --------------------------
and expenses of the Noteholders incurred in connection with the preparation,
execution, delivery and administration, modification and amendment of this
Amendment and the other instruments and documents to be delivered hereunder
(including, without limitation, the reasonable fees and expenses of counsel).

         SECTION 6. Execution in Counterparts. This Amendment may be executed in
         ------------------------------------
any number of counterparts and by different parties hereto in separate
counterparts, each of which when so executed shall be deemed to be an original
and all of which taken together shall constitute but one and the same agreement.
Delivery of an executed counterpart of a signature page to this Amendment by
telecopier shall be effective as delivery of a manually executed counterpart of
this Amendment.

         SECTION 7. Governing Law. This Amendment shall be governed by, and
         ------------------------
construed in accordance with, the laws of the State of New York.
<PAGE>

          IN WITNESS WHEREOF, the parties hereto have caused this Amendment to
be executed by their respective officers thereunto duly authorized, as of the
date first above written.

                                    ARTHUR D. LITTLE, INC.

                                    By: /s/ Frederick T. McElligott
                                        -------------------------------
                                       Name: Frederick T. McElligott
                                       Title:   Treasurer

                                    ARTHUR D. LITTLE INTERNATIONAL, INC.

                                    By: /s/ Frederick T. McElligott
                                        -------------------------------
                                       Name: Frederick T. McElligott
                                       Title:   Treasurer

                                    CONNECTICUT GENERAL LIFE INSURANCE COMPANY

                                    By:  CIGNA Investments, Inc. (authorized
                                    agent)

                                    By: /s/ Stephen H. Wilson
                                        -------------------------------
                                      Name:  Stephen H. Wilson
                                      Title:    Managing Director

                                    CONNECTICUT GENERAL LIFE INSURANCE COMPANY,
                                    on behalf of one or more separate accounts
                                    By:  CIGNA Investments, Inc. (authorized
                                    agent)

                                    By: /s/ Stephen H. Wilson
                                        -------------------------------
                                       Name:  Stephen H. Wilson
                                       Title:    Managing Director
<PAGE>

                                    LIFE INSURANCE COMPANY OF NORTH AMERICA
                                    By:  CIGNA Investments, Inc. (authorized
                                    agent)

                                    By: /s/ Stephen H. Wilson
                                       ---------------------------------
                                       Name:  Stephen H. Wilson
                                       Title:    Managing Director

                                    ACE PROPERTY AND CASUALTY INSURANCE COMPANY
                                    By:  CIGNA Investments, Inc. (authorized
                                    agent)

                                    By: /s/ Stephen H. Wilson
                                       ---------------------------------
                                       Name:  Stephen H. Wilson
                                       Title:    Managing Director

                                    THE LINCOLN NATIONAL LIFE INSURANCE COMPANY

                                    By: /s/ Chom S. Rectanus
                                       ---------------------------------
                                       Name:  Chom S. Rectanus
                                       Title:    Vice President

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