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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                    FORM 8-K


                                 CURRENT REPORT


     Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934


         Date of Report (Date of earliest event reported) April 27, 2005


                                ----------------

                             FAIR ISAAC CORPORATION
             (Exact name of registrant as specified in its charter)


          Delaware                   0-16439                  94-1499887
-----------------------------        -------             -------------------
(State or other jurisdiction       (Commission             (IRS Employer
      of incorporation)            File Number)           Identification No.)


          901 Marquette Avenue, Suite 3200
               Minneapolis, Minnesota                        55402-3232
               ----------------------                        ----------
      (Address of principal executive offices)               (Zip Code)


         Registrant's telephone number, including area code 612-758-5200
                                                            ------------

    Check the appropriate box below if the Form 8-K filing is intended to
simultaneously satisfy the filing obligation of the registrant under any of the
following provisions (see General Instruction A.2. below):

[_]  Written communications pursuant to Rule 425 under the Securities Act
     (17 CFR 230.425)

[_]  Soliciting material pursuant to Rule 14a-12 under the Exchange Act
     (17 CFR 240.14a-12)

[_]  Pre-commencement communications pursuant to Rule 14d-2(b) under the
     Exchange Act (17 CFR 240.14d-2(b))

[_]  Pre-commencement communications pursuant to Rule 13e-4(c) under the
     Exchange Act (17 CFR 240.13e-4(c))

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                                TABLE OF CONTENTS


   Item 2.02     Results of Operations and Financial Condition.
   Item 9.01     Financial Statements and Exhibits.
   Signature
   Exhibit Index
   Exhibit 99.1





Item 2.02     Results of Operations and Financial Condition.

         On April 27, 2005, Fair Isaac Corporation (the "Company") reported its
financial results for the quarter and six months ended March 31, 2005. See the
Company's press release dated April 27, 2005, which is furnished as Exhibit 99.1
hereto and incorporated by reference in this Item 2.02.


Item 9.01     Financial Statements and Exhibits.

     (c) Exhibits.

           Exhibit
           Number                 Description
         -----------------------------------------------------------------
             99.1                 Press Release dated April 27, 2005








                                    SIGNATURE


         Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.



                                   FAIR ISAAC CORPORATION

                                   By  /s/   CHARLES M. OSBORNE       
                                      --------------------------------
                                             Charles M. Osborne
                                   Vice President and Chief Financial Officer
Date:  April 27, 2005






                                  EXHIBIT INDEX

Exhibit
Number           Description                                 METHOD OF FILING
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99.1             Press Release dated April 27, 2005        Filed Electronically