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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 26, 2006
                                                      ------------------


                             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
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(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



                                       i




Item 2.02  Results of Operations and Financial Condition.

     On April 26, 2006, Fair Isaac Corporation (the "Company") reported its
financial results for the quarter and six months ended March 31, 2006. See the
Company's press release dated April 26, 2006, 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
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        99.1          Press Release dated April 26, 2006



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                                    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 26, 2006


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                                  EXHIBIT INDEX

Exhibit
Number                      Description                      Method of Filing
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 99.1          Press Release dated April 26, 2006           Filed Electronically