Document:

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                                                                 Exhibit 10.53

                         EDISON RECEIVABLES COMPANY LLC
                                   11TH FLOOR
                                529 FIFTH AVENUE
                            NEW YORK, NEW YORK 10017

September 30, 2002

Merrill Lynch Mortgage Capital Inc.
4 World Financial Center
22nd Floor
New York, New York 10080

School Services LLC
c/o Leeds Weld & Co.
660 Madison Avenue
15th Floor
New York, New York 10021

          Re:  Amendment to the Amended and Restated Credit and Security
               Agreement

Dear Ladies and Gentlemen:

          This letter is in regard to that certain Amended and Restated Credit
and Security Agreement, dated as of July 31, 2002 (the "Credit Agreement")
among Edison Receivables Company LLC ("Edison Receivables"), as borrower,
School Services LLC and Merrill Lynch Mortgage Capital Inc. ("MLMC"), as
lenders, and MLMC as agent for the lenders.

          The parties hereto hereby agree to change the date set forth in
clause (i) of the definition of "Expiration Date" in the Credit Agreement from
June 30, 2003 to July 15, 2003. The Credit Agreement is hereby accordingly
amended.

          It is understood and agreed that except as expressly provided
herein, no term or provision of the Credit Agreement or any other Facility
Document (as defined in the Credit Agreement) is hereby amended, modified or
supplemented, and each term and provision of
<PAGE>
Merrill Lynch Mortgage Capital Inc.
School Services LLC
September 30, 2002
Page 2 of 2

the Credit Agreement remains in full force and effect in accordance with the
provisions of the Credit Agreement.

          This letter agreement shall be governed by, and construed in
accordance with, the laws of the State of New York.

          Please acknowledge your agreement with the foregoing by signing where
indicated below and returning a copy to the undersigned.

                                   Best regards,

                                   EDISON RECEIVABLES COMPANY LLC,
                                   as borrower

                                   By:  /s/ Christopher J. Scarlata
                                       ______________________________

                                   Name:    Christopher J. Scarlata
                                   Title:   President

Accepted and Agreed effective as of
the 30th day of September, 2002

MERRILL LYNCH MORTGAGE CAPITAL INC.,
in its capacity as lender and agent

By:    /s/ Joseph Magnus
       _____________________

Name:      Joseph Magnus
Title:

SCHOOLS SERVICES LLC,
as lender

By:   /s/ Robert Bernstein
      ______________________

Name:     Robert Bernstein
Title:    Treasurer<PAGE>
                                                                    EXHIBIT 4.10

                             COMSHARE, INCORPORATED

                      EIGHTH AMENDMENT TO CREDIT AGREEMENT

Harris Trust and Savings Bank
Chicago, Illinois

Ladies and Gentlemen:

         Reference is hereby made to that certain Credit Agreement (as amended,
supplemented, modified or restated from time to time, the "Credit Agreement"),
dated as of September 23, 1997, by and among Comshare, Incorporated (the
"Company") and Comshare Limited (the "Borrowing Subsidiary") (together the
"Borrowers") and Harris Trust and Savings Bank (the "Bank"). All capitalized
terms used herein without definition shall have the same meanings herein as such
terms have in the Credit Agreement.

         The Borrowers have requested that the Bank waive past noncompliance
with and amend certain provisions of the Credit Agreement and the Bank will do
so under the terms and conditions set forth in this Amendment.

1. WAIVERS.

1.1 The Company has informed the Bank that, as of March 31, 2002, the Company
will not be in compliance with Sections 8.8 and 8.9 of the Credit Agreement
(which require, among other things, that the Company maintain a Fixed Charge
Coverage Ratio and a Minimum EBITDAL respectively, as specified therein). The
Bank hereby agrees to waive compliance with Sections 8.8 and 8.9 of the Credit
Agreement as of March 31, 2002, provided that this waiver shall not become
effective (x) unless and until the conditions precedent set forth in Section 3
hereof have been satisfied, and (y) unless the actual EBITDAL of the Company for
the four consecutive fiscal quarters of the Company ended March 31, 2002 is not
less than $1,500,000.

1.2 The Company has informed the Bank that, as of December 31, 2001 the Company
was not in compliance with Sections 8.8 and 8.9 of the Credit Agreement (which
require, among other things, that the Company maintain a Fixed Charge Coverage
Ratio and a Minimum EBITDAL, respectively, as specified therein). The Bank
hereby agrees to waive compliance with Sections 8.8 and 8.9 of the Credit
Agreement as of December 31, 2001, provided that this waiver shall not become
effective unless and until the conditions precedent set forth in Section 3
hereof have been satisfied.

1.3 The Company has informed the Bank that, as of September 30, 2001, the
Company was not in compliance with Section 8.9 of the Credit Agreement (which
requires, among other things that the Company maintain a Minimum EBITDAL, as
specified therein). The Bank hereby agrees to waive compliance with Section 8.9
of the Credit Agreement as of September 30, 2001.

<PAGE>
provided that this waiver shall not become effective unless and until the
conditions precedent set forth in Section 3 hereof have been satisfied.

2. AMENDMENT.

         Subject to the satisfaction of the conditions precedent set forth in
Section 3 hereof, Section 8 of the Credit Agreement shall be amended by adding,
immediately following Section 8.21 thereof, a new section 8.22 thereto, reading
in its entirety as follows:

                             Section 8.22. Minimum Cash Requirements. The
                    Company shall, at all times during the term of this
                    Agreement, maintain cash in U.S. Dollars in one or more
                    demand deposit accounts with commercial banks located in the
                    United States of America in an aggregate amount of not less
                    than $10,000,000, which cash balances shall be free and
                    clear of all Liens other than setoff rights of the
                    commercial banks in which such funds are deposited.

3. CONDITIONS PRECEDENT.

          The effectiveness of this Amendment is subject to the satisfaction of
all of the following conditions precedent:

                  (a) The Borrowers and the Bank shall have executed and
         delivered this Amendment.

                  (b) The Guarantors and each party signatory to that certain
         Debt Subordination Agreement dated September 23, 1997 shall have each
         executed and delivered to the Bank their consent to this Amendment in
         the forms set forth below.

                  (c) Legal matters incident to the execution and delivery of
         this Amendment shall be satisfactory to the Bank and its counsel.

                  (d) The Company shall have paid to the Bank an amendment fee
         in the amount of $15,000, representing 0.15% of the Commitment.

4. REPRESENTATIONS.

         In order to induce the Bank to execute and deliver this Amendment, the
Borrowers hereby represent to the Bank that as of the date hereof the
representations and warranties set forth in Section 6 of the Credit Agreement
are and shall be and remain true and correct (except as waiver herein, and
except that the representations contained in Section 6.5 shall be deemed to
refer to the most recent financial statements of the Borrowers delivered to the
Bank) and, except as waived herein, the Borrowers are in compliance with the
terms and conditions of the Credit Agreement and no Default or Event of Default
has occurred and is continuing under the Credit Agreement or shall result after
giving effect to this Amendment.

                                      -2-

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5. MISCELLANEOUS.

         5.1. The Borrowers heretofore executed and delivered to the Bank the
Security Agreement, Pledge Agreement and certain other Collateral Documents. The
Borrowers hereby acknowledge and agree that the Liens created and provided for
by the Collateral Documents continue to secure, among other things, the
Obligations arising under the Credit Agreement as amended hereby; and the
Collateral Documents and the rights and remedies of the Bank thereunder, the
obligations of the Borrowers thereunder, and the Liens created and provided for
thereunder remain in full force and effect and shall not be affected, impaired
or discharged hereby. Nothing herein contained shall in any manner affect or
impair the priority of the liens and security interests created and provided for
by the Collateral Documents as to the indebtedness which would be secured
thereby prior to giving effect to this Amendment.

         5.2 Except as specifically amended herein, the Credit Agreement shall
continue in full force and effect in accordance with its original terms.
Reference to this specific Amendment need not be made in the Credit Agreement,
the Note, or any other instrument or document executed in connection therewith,
or in any certificate, letter or communication issued or made pursuant to or
with respect to the Credit Agreement, any reference in any of such items to the
Credit Agreement being sufficient to refer to the Credit Agreement as amended
hereby.

         5.3. The Borrowers agree to pay on demand all costs and expenses of or
incurred by the Bank in connection with the negotiation, preparation, execution
and delivery of this Amendment, including the fees and expenses of counsel for
the Bank.

         5.4 This Amendment may be executed in any number of counterparts, and
by the different parties on different counterpart signature pages, all of which
taken together shall constitute one and the same agreement. Any of the parties
hereto may execute this Amendment by signing any such counterpart and each of
such counterparts shall for all purposes be deemed to be an original. This
Amendment shall be governed by the internal laws of the State of Illinois.

                           [SIGNATURE PAGE TO FOLLOW]

                                      -3-

<PAGE>
This Eighth Amendment to Credit Agreement is dated as of this 8th day of
May, 2002.

                                   COMSHARE, INCORPORATED

                                   By
                                     Name /s/ Brian Jarzynski
                                          ---------------------
                                     Title VP & CFO
                                          ---------------------

                                   COMSHARE LIMITED

                                   By
                                     Name /s/ Brian Jarzynski
                                          ---------------------
                                     Title VP & CFO
                                          ---------------------

Accepted and agreed to as of the date last above written.

                                   HARRIS TRUST AND SAVINGS BANK

                                   By
                                     Name /s/ Kirby Law
                                          ---------------------
                                     Title Vice President
                                          ---------------------

                                      -4-
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                    GUARANTORS' ACKNOWLEDGEMENT AND CONSENT

         Each of the undersigned Guarantors heretofore previously executed and
delivered to the Bank certain Loan Documents. Each of the undersigned hereby
consents to the Amendment to the Credit Agreement as set forth above and
confirms that the Loan Documents executed and delivered by it and all of the
undersigned's obligations thereunder remain in full force and effect and,
without limiting the foregoing, each of the undersigned acknowledges and agrees
that notwithstanding the execution and delivery of the Amendment, the Loan
Documents executed and delivered by each of the undesigned to the Agent remain
in full force and effect and the rights and remedies of the Agent and the
Lenders, the obligations of each of the undersigned thereunder and the liens and
security interests provided for thereunder remain in full force and effect and
shall not be affected, impaired or discharged hereby. Each of the undersigned
further agree that the consent of the undersigned to any further amendments to
the Credit Agreement shall not be required as a result of this consent having
been obtained, except to the extent, if any, required by the Loan Documents
referred to above.

                                           COMSHARE (U.S.), INC.
                                           COMSHARE HOLDINGS COMPANY
                                           COMSHARE LIMITED (CANADA)

                                           By

                                             Name   /s/ Brian Jarzynski
                                                   -----------------------------
                                             Title  VP & CFO
                                                   -----------------------------

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              SUBORDINATED CREDITORS' ACKNOWLEDGEMENT AND CONSENT

         Each of the undersigned heretofore executed in favor of the Bank a Debt
Subordination Agreement dated September 23, 1997. Each of the undersigned hereby
consent to the Eighth Amendment to Credit Agreement as set forth above and
confirms that the Debt Subordination Agreement and all of the undersigned's
obligations thereunder remain in full force and effect. Each of the undersigned
further agree that the consent of the undersigned to any further amendments to
the Credit Agreement shall not be required as a result of this consent having
been obtained, except to the extent, if any, required by the Debt Subordination
Agreement referred to above.

                                           COMSHARE, INCORPORATED
                                           COMSHARE (U.S.), INC.
                                           COMSHARE LIMITED
                                           COMSHARE HOLDINGS COMPANY
                                           COMSHARE LIMITED (CANADA)

                                           By

                                             Name   /s/ Brian Jarzynski
                                                   -----------------------------
                                             Title  VP & CEO
                                                   -----------------------------

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