Exhibit 10.13

                            FIRST AMENDMENT TO LEASE


In  reference  to the lease dated  September  5, 1991  between  111  Partners as
Landlord and Fair, Isaac and Company,  Incorporated as Tenant, the parties agree
that Tenant exercised its option to renew contained in Paragraph 32 of the lease
and that the current monthly rental rate is $69,927.23, subject to adjustment as
provided for in the lease each July 1st of the lease term.  The parties agree to
modify the terms of that lease as follows:

     A.   Landlord's Management Fee and the monthly amount paid as a maintenance
          reserve (hereinafter  "Maintenance Reserve") as described in paragraph
          5(b) shall each be increased as provided below effective each July 1st
          for the remaining term of the lease.

     B.   The parties  agree that as of July 1, 2001,  the amount of the monthly
          Management Fee was $1,287.00 per month and the Maintenance Reserve was
          $297.00 per month and that these  amounts  will be  effective  through
          June 2002.

     C.   The monthly amounts of the Management Fee and the Maintenance  Reserve
          will be  adjusted  effective  upon the  first day of the month of July
          2002  and  upon  the  expiration  of  each  12  months  thereafter  in
          accordance with changes in the U.S. Consumer Price Index for All Urban
          Consumers for San Francisco-Oakland-San  Jose (1982-84 = 100) ("CPI").
          The monthly payments will be increased to amounts equal to the product
          obtained  by  multiplying  the payment  amounts in effect  immediately
          prior  to  the  adjustment  date  (without  regard  to  any  temporary
          abatement  pursuant to other  provisions of the lease) by a fractions,
          the numerator of which is the CPI published most immediately  prior to
          the adjustment  date and the denominator of which is the CPI published
          for the month which is twelve months earlier.

     D.   All other terms and conditions of the lease will remain unchanged.


ACCEPTED AND AGREED:


  /s/ Henk J. Evenhuis                                   8/22/01
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TENANT                                                 DATE


  /s/ Roger A. Smith                                     8/30/01
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LANDLORD                                               DATE


  /s/ Michael J. Smith                                   8/30/01
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LANDLORD                                               DATE