Document:

<PAGE>
                                                                   EXHIBIT 10(p)

                               FIRST AMENDMENT TO
                                CREDIT AGREEMENT

         THIS FIRST AMENDMENT ("Amendment") dated as of November 2, 2001, by and
among the borrowers listed on Schedule 1 (collectively "Companies") and Comerica
Bank, a Michigan banking corporation ("Bank").

                                    RECITALS:

         A. Companies and Bank entered into a Credit Agreement dated as of April
25, 2001 ("Agreement").

         B. Companies and Bank desire to amend the Agreement as hereinafter set
forth.

         NOW, THEREFORE, the parties agree as follows:

         1. The definitions of Lending Availability, Reserve and Prime-based
Rate set forth in Section 1 of the Agreement are amended to read in their
entireties as follows:

         "`Lending Availability' shall mean as of any date of determination
thereof, the sum of (a) eighty five percent (85%) of Eligible Accounts plus (b)
fifty percent (50%) of Eligible Inventory; provided, however, in no event shall
the amount of Lending Availability determined under clause (b) exceed Five
Million Dollars ($5,000,000), plus (c) $2,000,000 less (d) the amount of the
Reserve as of such date of determination;

         `Prime-based Rate' shall mean for any day a per annum interest rate
which is the greater of (i) the Prime Rate or (ii) the Alternate Base Rate, plus
or minus in each case the Margin.

         `Reserve' shall mean as of any date of determination the amount
determined as set forth below:

<TABLE>
<CAPTION>
Period                                          Amount
------                                          ------
<S>                                        <C>
January 1                                       $0
January 2 through January 31                    $50,000
February 1 through February 28                  $100,000
March 1 through March 31                        $150,000
April 1 through April 30                        $200,000
May 1 through May 31                            $250,000
June 1 through June 30                          $300,000
July 1 through July 31                          $350,000
August 1 through August 31                      $400,000
September 1 through September 30                $450,000
October 1 through October 31                    $500,000
November 1 through November 30                  $550,000
December 1 through December 31                  $600,000"
</TABLE>

<PAGE>

         2. The definition of "Eurodollar-based Rate" is amended to delete the
words "two and one quarter percent (2 1/4%)" and to substitute therefor the word
"Margin".

         3. The following definitions are added to Section 1 of the Agreement in
alphabetical order:

         "`Applicable Fee Percentage' shall mean as of any date of
determination, the commitment fee percentage determined by reference to the
appropriate columns in the pricing matrix attached to this Agreement as Schedule
1.1.

         `Margin' shall mean, as of any date of determination, the applicable
interest rate margin as determined by reference to the appropriate columns in
the pricing matrix attached to this Agreement as Schedule 1.1."

         4. The second sentence of Section 2.5 is amended to read in its
entirety as follows:

         "The Revolving Credit Commitment Fee shall be an amount equal to the
average daily balance of the unborrowed portion of the Revolving Credit
Commitment for the monthly period then ending, minus the average daily face
amount of any outstanding Letters of Credit during such period, multiplied by
the Applicable Fee Percentage per annum."

         5. Companies may not request any advances under Section 4 of the
Agreement. The Bank's commitment to make advances under Section 4 is terminated.

         6. The following Sections 2.17 and 2.18 are hereby added to the
Agreement.

         "2.17 Prepayment. Notwithstanding anything in this Agreement or the
Revolving Credit Note to the contrary, the Companies agree that if they
refinance the credit facilities provided under this Agreement with any other
lender for any reason on or before May 1, 2003, then on the date of such
refinancing Companies shall pay to Bank a prepayment fee in the amount of
$75,000.

         2.18 Margin Adjustments.

         Adjustments in the Margin and Applicable Fee Percentage, based on the
Company's Cash Flow Coverage Ratio (Operating) and determined in accordance with
Schedule 1.1 hereto, shall be implemented on a quarterly basis as follows:

                                       2
<PAGE>

                  (a)      Such margin adjustments shall be given prospective
                           effect only, effective immediately upon the required
                           date of delivery of the financial statements under
                           Sections 8.1, establishing applicability of the
                           appropriate adjustments, if any.

                  (b)      Such adjustments under this Section 2.18 shall be
                           made irrespective of, and in addition to, any other
                           interest rate or pricing adjustments hereunder.

                  (c)      Until delivery of the financial statements for the
                           period ending December 31, 2002, the pricing set
                           forth under Pricing Matrix (B) of the attached
                           Schedule 1.1 shall apply.

         7.       Section 8.2(c) is amended to read in its entirety as follows:

                  "On Thursday of each week, a Borrowing Base Report (in the
         form attached as Exhibit `A') calculating the Lending Availability as
         of the end of the preceding week; provided that if the availability
         under the Revolving Credit Note (calculated as Lending Availability
         less the outstanding principal amount of Advances and less the undrawn
         amount of Letters of Credit plus outstanding Letter of Credit
         Obligations) is less than $500,000 for five (5) Business Days during
         any consecutive thirty (30) day period, then thereafter updated
         Borrowing Base Reports shall be provided each time Companies receive an
         Advance (but not less frequently than weekly) and such reports shall be
         accompanied by sales and receipts and such other detail as Bank may
         require;"

         8.       Sections 9.1 and 9.2 of the Agreement are amended to read in
                  their entireties as follow:

         9.1 Cash Flow Coverage Ratio. Beginning March 31, 2002, permit the
Consolidated Cash Flow Coverage Ratio (Environmental) or the Consolidated Cash
Flow Coverage Ratio (Operating) to be less than the following amounts during the
periods specified below:

<TABLE>
<CAPTION>
Period                                                           Environmental       Operating
------                                                           -------------       ---------
<S>                                                              <C>                <C>
March 31, 2002 through June 29, 2002                             .45 to 1.0          .65 to 1.0
June 30, 2002 through September 29, 2002                         .60 to 1.0          .75 to 1.0
September 30, 2002 through December 30, 2002                     .60 to 1.0          1.0 to 1.0
December 31, 2002 and thereafter                                 .70 to 1.0          1.0 to 1.0
</TABLE>

         9.2 Consolidated Tangible Net Worth. Permitted Consolidated Tangible
Net Worth at any time to be less than the following amounts during the periods
specified below:

                                       3
<PAGE>

<TABLE>
<CAPTION>
Period                                                        Amount
------                                                        ------
<S>                                                       <C>
December 31, 2001 through March 30, 2002                  $14,075,000
March 31, 2002 through June 29, 2002                      $14,300,000
June 30, 2002 through September 29, 2002                  $14,400,000
September 30, 2002 through December 30, 2002              $14,550,000
December 31, 2002 and thereafter                          $14,600,000
</TABLE>

         9. Attached Schedule 1.1 is hereby added to the Agreement.

         10. If transactional reporting is required under Section 8.2(c),
Companies shall be obligated to pay to Bank monthly in advance a collateral
monitoring fee of $500 per month.

         11. The Companies did not comply with the provisions of Sections 9.1
and 9.2 of the Agreement for the period ended September 30, 2001. The Bank
hereby waives any default under the Agreement arising as a result of such
non-compliance with the prior provisions for the period ended September 30,
2001.

         12. Companies hereby represent and warrant that, after giving effect to
the amendments and waivers contained herein, (a) execution, delivery and
performance of this Amendment and any other documents and instruments required
under this Amendment or the Agreement are within each Company's corporate
powers, have been duly authorized, are not in contravention of law or the terms
of any Company's Articles of Incorporation or Bylaws, and do not require the
consent or approval of any governmental body, agency, or authority; and this
Amendment and any other documents and instruments required under this Amendment
or the Agreement, will be valid and binding in accordance with their terms; (b)
the continuing representations and warranties of each Company set forth in
Sections 7.1 through 7.15 of the Agreement are true and correct on and as of the
date hereof with the same force and effect as made on and as of the date hereof;
(c) the continuing representations and warranties of each Company set forth in
Section 7.16 of the Agreement are true and correct as of the date hereof with
respect to the most recent financial statements furnished to the Bank by
Companies in accordance with Section 8.1 of the Agreement; and (d) no Event of
Default (as defined in the Agreement) or condition or event which, with the
giving of notice or the running of time, or both, would constitute an Event of
Default under the Agreement, as hereby amended, has occurred and is continuing
as of the date hereof.

         13. Except as expressly provided herein, all of the terms and
conditions of the Agreement remain unchanged and in full force and effect.

         14. Harvel Plastics, Inc. and the Bank acknowledge and agree that the
Letter Agreement dated April 25, 2001 is terminated and the Line of Credit (as
defined therein) is cancelled.

         15. This Amendment shall be effective upon (a) the payment by Companies
to Bank of a non-refundable amendment fee in the amount of $40,000 and (b)
execution of this Agreement by Companies and the Bank.

                                       4
<PAGE>

IN WITNESS the due execution hereof as of the day and year first above written.

COMERICA BANK                            DETREX CORPORATION

By:                                      By:
   ------------------------------            -------------------------------
                                                 Robert M. Currie

Its:                                     Its:    Secretary
   ------------------------------

                                         THE ELCO CORPORATION

                                         By:
                                             -------------------------------
                                                 Robert M. Currie

                                         Its:    Secretary

                                         HARVEL PLASTICS, INC.

                                         By:
                                             -------------------------------

                                         Its:
                                             -------------------------------

                                         S.O. REALTY, INC.

                                         By:
                                             -------------------------------
                                                 Robert M. Currie

                                         Its:     Secretary

                                        5

<PAGE>

                                   SCHEDULE 1

Detrex Corporation

The Elco Corporation

Harvel Plastics, Inc.

S.O. Realty, Inc.

                                       6

<PAGE>

                                  SCHEDULE 1.1

                               PRICING MATRIX (A)

               (AFTER DELIVERY OF 12/31/02 FINANCIAL STATEMENTS)
<TABLE>
<CAPTION>
CONSOLIDATED CASH FLOW                       PRIME MARGIN                    EURODOLLAR               COMMITMENT
COVERAGE (OPERATING)                                                           MARGIN                    FEE
                                                                                                      PERCENTAGE

<S>                                         <C>                              <C>                   <C>
>1.75 to 1.0                                    -1/2%                             2 1/4%                   1/4%
<1.75 to 1.0 and                                -1/4%                             2 1/2%                   1/4%
-
>1.50 to 1.0

<1.50 to 1.0 and                                0%                                2 3/4%                   3/8%
-
>1.25 to 1.0

<1.25 to 1.0 and                                1/4%                              3%                       1/2%
-
>1.10 to 1.0
-
<1.10 to 1.0                                    1/2%                              3 1/4%                   1/2%
-
</TABLE>

                               PRICING MATRIX (B)
               (UNTIL DELIVERY OF 12/31/02 FINANCIAL STATEMENTS)

<TABLE>
<CAPTION>
PRIME MARGIN                        EURODOLLAR                         COMMITMENT FEE
                                      MARGIN                             PERCENTAGE

<S>                                 <C>                             <C>
3/4%                                  3 1/2%                             1/2%
</TABLE>

                                       7<PAGE>

                                                                    EXHIBIT 4.01

                     SEVENTH 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 amend the Credit Agreement to
provide for the issuance of standby and commercial letters of credit upon the
application of the Company under the Revolving Credit, and the Bank will do so
under the terms and conditions set forth in this Amendment.

1.   AMENDMENTS.

     Subject to the satisfaction of the conditions precedent set forth in
Section 2 below, the Credit Agreement shall be and hereby is amended as follows:

     1.1  The second sentence of Section 1.1 of the Credit Agreement shall be
amended to read in its entirety as follows:

          The Revolving Credit may be utilized by each Borrower in the form of
          loans (individually a "Loan" and collectively the "Loans") on a
          revolving basis in U.S. Dollars and Optional Currencies, all as more
          fully hereinafter set forth; provided, however, that the sum of
          (i) the aggregate Original Dollar Amount of Loans outstanding at any
          one time to the Borrowers (taken together) and (ii) the aggregate
          outstanding amount of Letters of Credit (as determined pursuant to
          Section 1.4(a) hereof) at any one time shall not exceed the lesser
          of (x) $10,000,000 (such amount, as the same may be reduced pursuant
          to Section 3.4 hereof, being hereinafter referred to as the
          "Commitment") and (y) the Borrowing Base as then determined and
          computed.

     1.2  Section 1 of the Credit Agreement shall be amended by adding a new
Section 1.4 thereto, reading in its entirety as follows:

               Section 1.4.   Letters of Credit.  (a) General Terms. Subject to
          the terms and conditions hereof, the Revolving Credit may be availed
          of by the Company (and only the Company) in the

<PAGE>
                    form of standby and commercial letters of credit issued by
                    the Bank for the account of the Company (individually a
                    "Letter of Credit" and collectively the "Letters of
                    Credit"), provided that the aggregate amount of Letters of
                    Credit issued and outstanding hereunder shall not at any one
                    time exceed $1,000,000 and each Letter of Credit shall be in
                    an initial stated amount of not less than $10,000. For
                    purposes of this Agreement, a Letter of Credit shall be
                    deemed outstanding as of any time in an amount equal to the
                    maximum amount which could be drawn thereunder under any
                    circumstances and over any period of time plus any
                    unreimbursed drawings then outstanding with respect thereto.
                    If and to the extent any Letter of Credit expires or
                    otherwise terminates without having been drawn upon, the
                    availability under the Commitment shall to such extent be
                    reinstated.

                         (b)  Term.  Each Letter of Credit issued hereunder
                    shall expire not later than the earlier of (i) 12 months
                    from the date of issuance (or be cancelable not later than
                    12 months from the date of issuance and each renewal) or
                    (ii) the Termination Date.

                         (c)  General Characteristics.  Each Letter of Credit
                    issued hereunder shall be payable in U.S. Dollars, conform
                    to the general requirements of the Bank for the issuance of
                    a standby or commercial letter of credit, as the case may
                    be, as to form and substance, and be a letter of credit
                    which the Bank may lawfully issue.

                         (d)  Applications.  At the time the Company requests
                    each Letter of Credit to be issued (or prior to the first
                    issuance of a Letter of Credit in the case of a continuing
                    application), the Company shall execute and deliver to the
                    Bank an application for such Letter of Credit in the form
                    then customarily prescribed by the Bank (individually an
                    "Application" and collectively the "Applications"). Subject
                    to the other provisions of this subsection, the obligation
                    of the Company to reimburse the Bank for drawings under a
                    Letter of Credit shall be governed by the Application for
                    such Letter of Credit. Anything contained in the
                    Applications to the contrary notwithstanding, (i) in the
                    event the Bank is not reimbursed by the Company for the
                    amount the Bank pays on any drawing made under a Letter of
                    Credit issued hereunder by 11:00 a.m. (Chicago time) on the
                    date when such drawing is paid, the obligation of the
                    Company to reimburse the Bank for the amount of such drawing
                    shall bear interest (which the Company hereby promises to
                    pay on demand) from and after the date of the drawing is
                    paid by the Bank until repayment in full thereof at the
                    fluctuating rate per annum determined by adding 2% to the

                                     - 2 -
<PAGE>
           Domestic Rate as from time to time in effect (computed on the basis
           of a year of 360 days for the actual number of days elapsed), (ii)
           the Company shall pay fees in connection with each Letter of Credit
           as set forth in Section 3 hereof, (iii) prior to the occurrence of a
           Default or an Event of Default, the Bank will not call for the
           funding of a Letter of Credit by the Company prior to being presented
           with a drawing thereunder (or, in the event the drawing is a time
           draft, prior to its due date).

     1.3.  Section 3.1 of the Credit Agreement shall be amended by adding a new
subsection 3.1(d) thereto, reading in its entirety as follows:

               (d) Letter of Credit Fees. Quarterly in arrears, on the last
           Business Day of each calender quarter of each year and on the
           Termination Date, the Company shall pay to the Bank a letter of
           credit fee at a rate per annum equal to the Applicable Margin for
           Eurocurrency Portions (computed on the basis of a year of 360 days
           and the actual number of days elapsed) in effect during each day of
           such quarter applied to the daily average face amount of Letters of
           Credit outstanding during such quarter. In addition, the Company
           shall pay to the Bank the Bank's standard drawing, negotiation,
           amendment, and other administrative fees for each Letter of Credit.
           Such standard fees referred to in the preceding sentence may be
           established by the Bank from time to time.

     1.4.  Section 3.3 of the Credit Agreement shall be amended to read in its
entirety as follows:

               Section 3.3  Mandatory Prepayment. The Borrowers covenant and
           agree that if at any time the sum of (i) the aggregate Original
           Dollar Amount of Loans outstanding at any one time and (ii) the
           aggregate amount of Letters of Credit outstanding at any one time
           shall be in excess of the lesser of (x) the Borrowing Base as then
           determined and computed or (y) the Commitment then in effect, the
           Borrowers shall immediately and without notice or demand pay over the
           amount of the amount of the excess to the Bank as and for a mandatory
           prepayment on the Note until payment in full thereof. Each such
           prepayment shall be accompanied by accrued interest on the amount
           prepaid to the date of prepayment plus any amounts due to the Bank
           under Section 11.5 hereof.

                                      -3-
<PAGE>
     1.5.  Section 3.4 of the Credit Agreement shall be amended to read in its
entirety as follows:

               Section 3.4.  Terminations.  The Company shall have the right at
           any time and from time to time, upon 1 Business Day's prior notice to
           the Bank, to terminate without premium or penalty and in whole or in
           part (but if in part, then in an amount not less than $500,000) the
           Commitment, provided that the Commitment may not be reduced to an
           amount less than the sum of (i) the aggregate Original Dollar Amount
           of Loans outstanding at such time and (ii) the aggregate amount of
           Letters of Credit outstanding at such time. No termination of the
           Commitment pursuant to this Section may be reinstated.

     1.6.  Section 5.1 of the Credit Agreement shall be amended by adding the
following new definitions, each in its appropriate place in the alphabetical
sequence:

               "Application" is defined in Section 1.4(d) hereof.

               "Letter of Credit" is defined in Section 1.4(a) hereof.

     1.7.  Section 5.1 of the Credit Agreement shall be amended by amending the
following definitions to read in their entirety as follows:

               "Loan Documents" means this Agreement, the Note, the
           Applications, each Subsidiary Guaranty Agreement, the Collateral
           Documents and each other instrument or document to be delivered
           hereunder or thereunder or otherwise in connection therewith.

               "Obligations" means all obligations of the Borrowers and either
           of them to pay principal and interest on the Loans, all obligations
           of the Company to reimburse the Bank with respect to draws on any
           Letter of Credit, all fees and charges payable hereunder, and all
           other payment obligations of the Company arising under or in relation
           to any Loan Document, in each case whether now existing or
           hereafter arising, due or to become due, direct or indirect, absolute
           or contingent, and howsoever evidenced, held or acquired.

     1.8.  Section 6.4 of the Credit Agreement shall be amended by adding the
words "and the Letters of Credit" following the word "Loans" in the first
sentence thereof.

     1.9.  The introductory clause of Section 7 and Section 7.1 of the Credit
Agreement shall be amended to read in their entirety as follows:

          SECTION 7.  CONDITIONS PRECEDENT.

                                      -4-

<PAGE>
     The obligation of the Bank to make any Loan or issue or extend the
expiration date (including by not giving notice of non-renewal) of any Letter
of Credit under this Agreement is subject to the following conditions precedent:

     Section 7.1.   All Advances.  As of the time of the making of each
extension of credit (including the initial extension of credit) hereunder:

     (a)  each of the representations and warranties set forth in Section 6
hereof and in the other Loan Documents shall be true and correct as of such
time, except to the extent the same expressly relate to an earlier date;

     (b)  the relevant Borrower's request for such credit shall be made in full
compliance with all of the terms and conditions of Sections 1 and 2 of this
Agreement, in the case of any request for issuance of a Letter of Credit, the
Bank shall have received a duly completed Application therefor together with
any fees called for by Section 3.1(d) hereof, and, in the case of an extension
or increase in the amount of a Letter of Credit, a written request therefor in
a form acceptable to the Bank together with any fees called for by Section
3.1(d) hereof, and no Default or Event of Default shall have occurred and be
continuing or would occur as a result of making such extension of credit;

     (c)  in the case of any request for a Loan or for issuance of a Letter of
Credit, after giving effect to such extension of credit, the sum of (1) greater
of (x) the aggregate U.S. Dollar Equivalent of all Loans outstanding under this
Agreement and (y) the aggregate Original Dollar Amount of all Loans outstanding
under this Agreement, plus (2) the aggregate amount of Letters of Credit
outstanding at any one time, shall not exceed the lesser of (i) the Commitment
and (ii) the Borrowing Base;

     (d)  such extension of credit shall not violate any order, judgment or
decree of any court or other authority or any provision of law or regulation
applicable to the Bank (including, without limitation, Regulation U of the
Board of Governors of the Federal Reserve System) as then in effect.

A Borrower's request for any Loan or the Company's request for any Letter of
Credit shall constitute its warranty as to the facts specified in subsections
(a) through (c), both inclusive, above.

                                      -5-
<PAGE>
     1.10  Clause (a) of Section 9.1 of the Credit Agreement shall be amended
to read in its entirety as follows:

               (a)  default in the payment when due of all or any part of the
           principal of the Note or of any reimbursement obligation with respect
           to any Letter of Credit (whether at the stated maturity of the Note
           or at any other time provided for in this Agreement);

     1.11.  Section 9 of the Credit Agreement shall be amended by adding a new
Section 9.4 thereto, reading in its entirety as follows:

               Section 9.4.  Collateral for Undrawn Letters of Credit.  When
           any Event of Default, other than an Event of Default described in
           subsection (p) or (q) of Section 9.1, has occurred and is continuing,
           the Company shall, upon demand of the Bank, and when any Event of
           Default described in subsection (p) or (q) of Section 9.1 has
           occurred the Company shall, without notice or demand from the Bank,
           immediately pay to the Bank the full amount of each Letter of Credit
           then outstanding, the Company agreeing to immediately make such
           payment and acknowledging and agreeing that the Bank would not have
           an adequate remedy at law for failure of the Company to honor any
           such demand and that the Bank shall have the right to require the
           Company to specifically perform such undertaking whether or not any
           draws have been made under any such Letters of Credit.

     1.12. Section 11.4 of the Credit Agreement shall be amended to read in its
entirety as follows:

               Section 11.4.  Taxes and Increased Costs.  With respect to any
           Eurocurrency Portion or any Letter of Credit, if the Bank shall
           determine in good faith that any change in any applicable law,
           treaty, regulation or guideline (including, without limitation,
           Regulation D of the Board of Governors of the Federal Reserve System)
           or any new law, treaty, regulation or guideline, or any
           interpretation of any of the foregoing by any governmental authority
           charged with the administration thereof or any central bank or other
           fiscal, monetary or other authority having jurisdiction over the Bank
           or its lending branch or the Eurocurrency Portions or Letters of
           Credit contemplated by this Agreement (whether or not having the
           force of law), shall:

                   (i)  impose, increase, or deem applicable any reserve,
               special deposit or similar requirement against assets held by, or
               deposits in or for the account of, or loans by, or any other
               acquisition of funds or disbursements by, the Bank which is not
               in

                                      -6-
<PAGE>

          any instance already accounted for in computing the interest rate
          applicable to such Eurocurrency Portion or fee applicable to such
          Letter of Credit;

                 (ii)  subject the Bank, any Letter of Credit, any Eurocurrency
          Portion or the Note to the extent it evidences such a Portion to any
          tax, duty, charge, stamp tax, fee, deduction or withholding in respect
          of this Agreement, any Letter of Credit, any Eurocurrency Portion or
          the Note to the extent it evidences such a Portion, except such taxes
          as may be measured by the overall net income or gross receipts of the
          Bank or its lending branches and imposed by the jurisdiction, or any
          political subdivision or taxing authority thereof, in which the Bank's
          principal executive office or its lending branch is located;

                 (iii) change the basis of taxation of payments of principal and
          interest due from the Company to the Bank hereunder, with respect to
          any Letter of Credit or under the Note to the extent it evidences any
          Eurocurrency Portion (other than by a change in taxation of the
          overall net income or gross receipts of the Bank); or

                 (iv)  impose on the Bank any penalty with respect to the
          foregoing or any other condition regarding this Agreement, any Letter
          of Credit, any Eurocurrency Portion, or its disbursement, or the Note
          to the extent it evidences any Eurocurrency Portion;

          and the Bank shall determine in good faith that the result or any of
          the foregoing is to increase the cost (whether by incurring a cost or
          adding to a cost) to the Bank, within five (5) days after the Bank's
          written demand therefor, of creating or maintaining any Eurocurrency
          Portion or any Letter of Credit hereunder or to reduce the amount of
          principal or interest or fees received or receivable by the Bank
          (without benefit of, or credit for, any prorations, exemption, credits
          or other offsets available under any such laws, treaties, regulations,
          guidelines or interpretations thereof), then the Borrowers shall pay
          to the Bank from time to time as specified by the Bank such additional
          amounts as the Bank shall reasonably determine are sufficient to
          compensate and indemnify it for such increased cost or reduced amount.
          If the bank makes such a claim for compensation, it shall provide to
          the company a certificate setting forth the computation of the
          increased cost or reduced amount as a result of any event mentioned
          herein in reasonable detail and such certificate shall be conclusive
          if reasonably determined.

                                             - 7 -
<PAGE>
     1.13. The first sentence of Section 11.6 of the Credit Agreement shall be
amended to read in its entirety as follows:

                  Subject to the immediately following sentence, the Bank may,
         at its option, elect to make, fund or maintain Portions of the Loans or
         issue Letters of Credit hereunder at such of its branches or offices as
         the Bank may from time to time elect.

     1.14. Section 12.10 of the Credit Agreement shall be amended by adding the
words "" and the Letters of Credit" immediately following the word "Loans" in
the third line thereof.

2.   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)  All accrued and unpaid legal fees of the Bank incurred in
     connection with this Amendment or earlier amendments or matters relating to
     the Credit Agreement shall have been paid by the Borrowers.

3.   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 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.

4.   MISCELLANEOUS.

     4.1  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

                                      -8-
<PAGE>
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.

     4.2.  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.

     4.3.  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.

     4.4.  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]

                                      -9-

<PAGE>
Dated as of this 28th day of September, 2001.

                                             COMSHARE, INCORPORATED

                                             By
                                               Name  /s/  Brian Jarzynski
                                               Title      VP & CFO

                                             COMSHARE LIMITED

                                             By
                                               Name  /s/  Brian Jarzynski
                                               Title      Director

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

                                             HARRIS TRUST AND SAVINGS BANK

                                             By    /s/  Kirby M. Law
                                               Name
                                               Title      Vice President
<PAGE>

                    GUARANTORS' ACKNOWLEDGEMENT AND CONSENT

     Each of the undersigned Guarantors heretofore executed and delivered to
the Bank a separate Guaranty Agreement each dated September 23, 1997. Each of
the undersigned hereby consent to the Seventh Amendment to Credit Agreement as
set forth above and confirm that its Guaranty 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 Guaranty Agreement referred to above.

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

                                        BY  /s/ Brian Jarzynski
                                            ------------------------
                                            Name:  Brian Jarzynski
                                                   -----------------
                                            Title: VP & CFO
                                                   -----------------
<PAGE>

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

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