Document:

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                                  AMENDMENT TO
                              EMPLOYMENT AGREEMENT

DATE: January 1, 2001

PARTIES AND ADDRESSES:

         CorVu Corporation
         3400 West 66th Street, Suite 445
         Edina, MN  55345                                        (the "Company")

         Justin MacIntosh
         Level 4, 1 James Place
         North Sydney NSW 2060 AUSTRALIA                           ("Executive")

RECITALS:

         A. The Company is a Minnesota corporation engaged principally in the
business of developing, manufacturing and selling business software programs.

         B. Executive is currently employed as the Company's Chairman, President
and Chief Executive Officer pursuant to an employment agreement effective as of
July 1, 1999 which terminates June 30, 2002 (the "Agreement").

         C. In consideration of the Company's business performance and to
provide further incentives to Executive, the Company and Executive desire to
amend the compensation provisions of the Agreement.

AGREEMENTS:

         In consideration of the mutual promises and undertakings set forth
herein, the Company and Executive agree as follows:

         1. Article 2 "Compensation" of the Agreement is deleted and replaced by
the following provision:

                                    ARTICLE 2
                                  COMPENSATION

                           "2.1 COMPENSATION. Subject to Paragraph 4.2 and
                  Articles 5, 7, 8 and 9 hereof, Executive shall be paid
                  compensation for the performance of his duties hereunder as
                  follows:

                           (a) ANNUAL BASE SALARY. During the term of this
                           Agreement, the Company shall pay Executive an annual
                           base salary of $180,000 commencing July 1, 2000
                           payable monthly, which may be adjusted from time to
                           time by the

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                           Board of Directors. The Company shall be entitled to
                           deduct or withhold all taxes and charges which the
                           Company may be required to deduct or withhold
                           therefrom.

                           (b) ACCRUED SALARY. Executive agrees to forgive cash
                           compensation in the total amount of $241,588 that was
                           accrued under the Agreement for the period through
                           December 31, 2000.

                           (c) BONUS COMPENSATION. In addition to the base
                           salary, Employer shall be eligible to receive bonus
                           compensation based on the Company's achievement of
                           certain pre-determined audited annual earnings before
                           interest and taxes ("EBIT") for the Company's fiscal
                           years 2001, 2002, and 2003, respectively. The
                           Compensation Committee of the Company's board of
                           directors has approved the following bonus
                           compensation criteria for such fiscal years:

<Table>
<Caption>
                           ---------------------------------- -----------------------------------------
                                     AUDITED EBIT                 AMOUNT OF BONUS COMPENSATION
                           ---------------------------------- -----------------------------------------
<S>                                                           <C>
                           Up to $1,000,000                   Thirty percent (30%) of EBIT
                           ---------------------------------- -----------------------------------------
                           $1,000,001 to $2,000,000           Twenty percent (20%) of EBIT
                           ---------------------------------- -----------------------------------------
                           $2,000,001 to $3,000,000           Ten percent (10%) of EBIT
                           ---------------------------------- -----------------------------------------
                           Over $3,000,000                    Five percent (5%) of EBIT
                           ---------------------------------- -----------------------------------------
</Table>

                           Executive's bonus compensation pursuant to this
                           subdivision, if any, will be paid to him in a lump
                           sum within fifteen (15) days following the filing of
                           the audited financial statements for the most
                           recently completed fiscal year as filed with the
                           Securities and Exchange Commission (SEC). Executive's
                           bonus compensation, if any, shall be subject to
                           withholding for income and FICA taxes and any other
                           proper deductions. Notwithstanding anything to the
                           contrary, the Company's payment of bonus compensation
                           to Executive in the event Executive does not remain
                           in Company's employ for the full then current fiscal
                           year shall be controlled by Paragraph 2.2 of this
                           Agreement.

                           (d) ADDITIONAL BONUS PAYMENTS. The Compensation
                           Committee of the Company's board of directors may in
                           its sole discretion grant to Executive bonus payments
                           in addition to the bonus compensation specified in
                           subdivision (c) of this Section.

                           (e) OPTIONS. Executive shall also be granted options
                           to purchase a total of 675,000 shares of the
                           Company's common stock at $1.33 per share, with
                           225,000 of said options vesting on July 1, 1999,
                           225,000 options vesting on July 1, 2000, and 225,000
                           options vesting on July 1, 2001. The options must be
                           exercised within 7 years from the date of grant of
                           the options and shall be subject to such other terms
                           and conditions as are contained in a Stock Option
                           Agreement between Company and Executive evidencing
                           such options.

                           2.2) TERMINATION OF COMPENSATION. Except as provided
                  in Articles 4, 7, 8 and 9 of this Agreement, the Company's
                  obligation to pay compensation to Executive under this Article
                  2 shall terminate at the close of business on the date on
                  which Executive's employment is terminated; provided, however,
                  that:

                                       2
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                           (a) the Company shall remain liable to pay Executive
                           any amounts due Executive for services rendered prior
                           to such termination date pursuant to Paragraph
                           2.1(a); and

                           (b) the Company shall calculate Executive's earned
                           bonus compensation pro rata to and including the date
                           of termination. If Executive's employment is
                           terminated during the first three quarters of the
                           Company's fiscal year, Executive's earned bonus
                           compensation shall be calculated based on the
                           Company's unaudited financial statements as filed
                           with the SEC; for the quarter in which the
                           termination occurred, the earned bonus compensation
                           shall be pro rated based on the number of calendar
                           days Executive was employed by the Company. If
                           Executive's employment is terminated in the fourth
                           quarter of the Company's fiscal year, the Executive's
                           earned bonus compensation shall be calculated pro
                           rata based on the Company's audited financial
                           statements. The Company shall pay Executive any
                           earned bonus within fifteen (15) days after the
                           filing of unaudited quarterly results with the SEC,
                           or within fifteen (15) days following the filing of
                           the audited financial statements for the most
                           recently completed fiscal year as filed with the SEC.

         2. Section 5.2 "COMPENSATION UPON TERMINATION OF EXECUTIVE'S
EMPLOYMENT" of the Agreement is eleted and replaced by the following provision:

                  "5.2 COMPENSATION UPON TERMINATION OF EXECUTIVE'S EMPLOYMENT.
                  In the event that Executive's employment with the Company
                  terminates, the following provisions shall govern as
                  applicable:

                           (a) If termination occurs pursuant to Paragraph
                           5.1(a) (by mutual written agreement) the agreement of
                           the parties shall control.

                           (b) If termination occurs pursuant to Paragraph
                           5.1(b) (for death), all benefits shall terminate as
                           of the termination date, and base salary and bonus
                           shall terminate as provided in Paragraph 2.2.

                           (c) If termination occurs pursuant to Paragraph
                           5.1(c) (for Cause) or 5.1(h) (resign without Good
                           Reason), all benefits shall terminate as of the
                           termination date, and base salary and any earned
                           bonus shall be paid to the date of termination as
                           provided in Paragraph 2.2.

                           (d) If termination occurs pursuant to Paragraph
                           5.1(d) (disability), the provisions of Paragraph 4.2
                           shall govern the termination of benefits, base salary
                           and bonus.

                           (e) If termination occurs pursuant to Paragraph
                           5.1(e) (retirement), the provisions of Paragraph
                           5.2(b) shall govern the termination of benefits, base
                           salary and bonus.

                                       3
<Page>

                           (f) If termination occurs pursuant to 5.1(f) (by the
                           Company without Cause) then Executive's base salary
                           and any earned bonus shall be paid to the date of
                           termination as provided in Paragraph 2.2 and in
                           addition:

                                    (i) the Company shall pay Executive, as
                                    severance pay, in accordance with the
                                    Company's normal payroll practices for
                                    executive employees, such number of
                                    consecutive monthly installments of his base
                                    salary in effect as of the date of
                                    termination as is equal to the greater of
                                    (A) the number of months remaining in the
                                    Term (without regard to renewals) of this
                                    Agreement, or (B) nine (9).

                                            (ii) Executive shall be entitled to
                                    continued participation in hospital and
                                    medical plans and programs of the Company
                                    for such period as is provided by law
                                    following termination of Executive's
                                    employment, subject to Executive's paying
                                    the employee portion of the cost of such
                                    participation and subject to termination of
                                    participation upon Executive becoming
                                    entitled to comparable benefits on
                                    subsequent employment.

                           (g) If termination occurs pursuant to Paragraph
                           5.1(g) the compensation provisions of Paragraph
                           5.2(c) shall apply.

                           (h) All payments made to Executive under this
                           Paragraph 5.2 shall be reduced by amounts (i)
                           required to be withheld in accordance with federal,
                           state and local laws and regulations in effect at the
                           time of payment, or (ii) owed to the Company by
                           Executive for any amounts advanced, loaned or
                           misappropriated."

3. The parties agree that this Amendment to Employment Agreement shall be
retroactively effective as of July 1, 2000.

4. Except as amended herein, the Agreement shall remain in full force and
effect.

         IN WITNESS WHEREOF, the parties hereto have executed this Amendment to
Employment Agreement effective as of July 1, 2000.

/s/ Justin M. Macintosh
--------------------------------------------
Justin M. MacIntosh

CorVu Corporation

By:   /s/ David C. Carlson
    -------------------------------------------------
Its: Chief Financial Officer

                                       4Prepared by MERRILL CORPORATION

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EXHIBIT 10.15    
  

    October 8, 2001 

Mr. Keith
G. Baxter

President and Chief Executive Officer

CornerStone Propane GP, Inc.

432 Westridge Drive

Watsonville, CA 95076 

Dear
Keith: 

    This
letter agreement (the "Agreement") will confirm the understanding between NorthWestern Corporation ("NorthWestern") and CornerStone Propane GP, Inc. (the "GP"), in
reference to that certain Refunding Credit Agreement, dated as of November 20, 1998, as amended June 30, 2000, among CornerStone Propane, L.P., a Delaware limited partnership (the
"Borrower"), Bank of America, N.A. as Agent (the "Agent"), and the financial institutions ("Lenders") signatory thereto (the "Credit Agreement), and that certain Guaranty Agreement, dated as of
June 30, 2000, as amended, by NorthWestern in favor of the Agent on behalf of the Lenders (the "Guaranty"). Capitalized terms used and not otherwise defined herein shall have the meanings set
forth in the Guaranty. 

    It
is our understanding that the Credit Agreement expires as of November 30, 2001 (the "Maturity Date"). Pursuant to the Guaranty, NorthWestern has agreed to guaranty to the
Agent and the Lenders the timely payment in full when due of the Guarantied Obligations under the Credit Agreement up to but not exceeding the Guarantied Amount. The Guarantied Amount is currently
limited to $70,000,000, together with interest thereon and certain expenses and other amounts. In order to satisfy a demand under the Guaranty, in addition to direct payment, NorthWestern also has the
right to elect to purchase, without recourse, all of the Loans ratably from the Lenders at a price equal to 100% of the principal amount thereof plus accrued fees and interest to the date of purchase,
and to succeed to the interests of the Lenders under the Credit Agreement, the Intercreditor Agreement, the proceeds of Collateral and the other Loan Documents. The foregoing guaranty obligation and
loan purchase election are referred to collectively herein as the "Credit Support." 

    In
the event that the Borrower is unable to extend or replace the Credit Agreement on or before the Maturity Date, in order to enable the Borrower to obtain a replacement facility,
NorthWestern agrees to provide the Borrower with continuing credit support substantially similar to the current Credit Support. The foregoing commitment by NorthWestern is conditioned upon the
negotiation and execution of definitive lending documents acceptable to the Borrower and NorthWestern, the written agreement of the Borrower to pay NorthWestern a financial accommodation fee and
related expenses and to provide customary lender indemnification on substantially similar terms to those agreed to in connection with the current Credit Support. 

    The
total liability of NorthWestern under this Agreement shall at no time exceed the Guarantied Amount; provided, further, that each
payment made by NorthWestern pursuant hereto shall reduce the then remaining maximum liability of NorthWestern under this Agreement by the amount of such payment, and shall create a liability of the
Borrower to NorthWestern with respect to such amount. The Borrower covenants and agrees to use its best efforts on a continuing basis to obtain a credit facility or other financing not dependent on
continued credit support from NorthWestern. 

    This
Agreement is not, and nothing herein contained and nothing done pursuant hereto by NorthWestern shall be deemed to constitute, a guarantee, direct or indirect, by NorthWestern of
any debt, liability or obligation arising out of a borrowing of money or a trade payable, or any other debt, liability or obligation, of any kind or character whatsoever, of the Borrower. 

1

 

    This letter shall not be construed as an amendment, waiver or modification of the Guaranty or any related fee arrangement. 

    This
Agreement and the obligations of NorthWestern hereunder shall terminate on the earliest of (i) July 1, 2002, (ii) the Borrower obtains a comparable credit
facility that does not require as a condition to its effectiveness the continuation of NorthWestern's Credit Support, (iii) the date on and as of which all amounts payable by the Borrower under
the Credit Agreement (including any extension or replacement thereof) have been paid in full, and the Lenders have no further obligation to extend credit or make financial accommodations to the
Borrower thereunder, (iv) upon a merger, combination or sale of the Borrower or a disposition of all or a substantial portion of the Borrower's assets, a change of control involving the
Borrower, the GP or NorthWestern, or (v) the breach by the Borrower of any material obligation with respect to the arrangements hereunder. 

    This
Agreement incorporates the entire understanding of the parties and supersedes all previous agreements and shall be governed by, and construed in accordance with, the laws of the
State of Delaware as applied to contracts made and performed in such State, without regard to principles of conflict of laws. All actions and proceedings arising out of or relating to this letter
agreement shall be heard and determined exclusively in any Delaware state or federal court, to whose jurisdiction the
parties hereby irrevocably submit. This Agreement may be modified or amended only by the written agreement of NorthWestern and the GP acting on behalf of the Borrower. This Agreement may be executed
simultaneously in counterparts, each of which shall be deemed an original, but all of which shall constitute one and the same instrument. This Agreement has been and is made solely for the benefit of
the Borrower and NorthWestern, and no other person shall acquire or have any right under or by virtue of this Agreement. The rights of the parties hereunder may not be assigned. 

    If
the foregoing terms correctly set forth our agreement, please confirm this by signing and returning the duplicate copy of this letter. Thereupon this letter, as signed in
counterpart, shall constitute our agreement on the subject matter herein. 

	 	 	 	NORTHWESTERN CORPORATION
	

 	

 	
 	

By:	

  
 Name: Kipp D. Orme

Title: VP Finance & Chief Financial Officer
	

Accepted and agreed to as of the date first written above:

CORNERSTONE PROPANE GP, INC.,

As general partner of the Borrower
	

By:	

  
 Name: Keith G. Baxter

Title: President and Chief Executive Officer	
 	

 	

 

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EXHIBIT 10.15

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