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


SCHEDULE 13D
(Rule 13d-101)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO
RULE 13d-2(a)

Under the Securities Exchange Act of 1934
(Amendment No.4)*

Fair Isaac Corporation

(Name of Issuer)

Common Stock

(Title of Class of Securities)

303250104

(CUSIP Number)

Sandell Asset Management Corp.
40 West 57th Street
26th Floor
New York, NY 10019
Attention: Richard Gashler, General Counsel
212-603-5700

With a Copy to:
Marc Weingarten, Esq.
Schulte Roth & Zabel LLP
919 Third Avenue
New York, NY 10019
212-756-2000

(Name, Address and Telephone Number of Person Authorized to Receive Notices and
Communications)

July 24, 2009
(Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the following box
[ ].

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See Rule 13d-7 for other parties to whom copies are to be sent.

(Continued on following pages)

(Page 1 of 9 Pages)


* The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page. The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

---------------------------- ----------------------------
CUSIP No. 303250104 SCHEDULE 13D Page 2 of 9 Pages
---------------------------- ----------------------------

------------- -----------------------------------------------------------------
 1 NAME OF REPORTING PERSON

 Castlerigg Master Investments Ltd.
------------- -----------------------------------------------------------------
 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) |_| (b) |_|
------------- -----------------------------------------------------------------
 3 SEC USE ONLY
------------- -----------------------------------------------------------------
 4 SOURCE OF FUNDS

 WC
------------- -----------------------------------------------------------------
 5 CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
 TO ITEMS 2(d) or 2(e) |_|
------------- -----------------------------------------------------------------
 6 CITIZENSHIP OR PLACE OF ORGANIZATION

 British Virgin Islands
------------- -----------------------------------------------------------------
 NUMBER OF 7 SOLE VOTING POWER

 SHARES 0
 ----------- -----------------------------------------------------
BENEFICIALLY 8 SHARED VOTING POWER

 OWNED 2,874,000
 ----------- -----------------------------------------------------
 BY EACH 9 SOLE DISPOSITIVE POWER

 REPORTING 0
 ----------- -----------------------------------------------------
 PERSON 10 SHARED DISPOSITIVE POWER
 2,874,000
 WITH
------------- ----------- -----------------------------------------------------
 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

 2,874,000
------------- -----------------------------------------------------------------
 12 CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
 SHARES |_|
------------- -----------------------------------------------------------------
 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

 5.9%
------------- -----------------------------------------------------------------
 14 TYPE OF REPORTING PERSON

 CO
------------- -----------------------------------------------------------------


---------------------------- ----------------------------
CUSIP No. 303250104 SCHEDULE 13D Page 3 of 9 Pages
---------------------------- ----------------------------

------------- -----------------------------------------------------------------
 1 NAME OF REPORTING PERSON

 Sandell Asset Management Corp.
------------- -----------------------------------------------------------------
 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) |_| (b) |_|
------------- -----------------------------------------------------------------
 3 SEC USE ONLY
------------- -----------------------------------------------------------------
 4 SOURCE OF FUNDS

 AF
------------- -----------------------------------------------------------------
 5 CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
 TO ITEMS 2(d) or 2(e) |_|
------------- -----------------------------------------------------------------
 6 CITIZENSHIP OR PLACE OF ORGANIZATION

 Cayman Islands
------------- -----------------------------------------------------------------
 NUMBER OF 7 SOLE VOTING POWER

 SHARES 0
 ----------- -----------------------------------------------------
BENEFICIALLY 8 SHARED VOTING POWER

 OWNED 2,874,000
 ----------- -----------------------------------------------------
 BY EACH 9 SOLE DISPOSITIVE POWER

 REPORTING 0
 ----------- -----------------------------------------------------
 PERSON 10 SHARED DISPOSITIVE POWER
 2,874,000
 WITH
------------- ----------- -----------------------------------------------------
 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

 2,874,000
------------- -----------------------------------------------------------------
 12 CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
 SHARES |_|
------------- -----------------------------------------------------------------
 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

 5.9%
------------- -----------------------------------------------------------------
 14 TYPE OF REPORTING PERSON

 CO
------------- -----------------------------------------------------------------


---------------------------- ----------------------------
CUSIP No. 303250104 SCHEDULE 13D Page 4 of 9 Pages
---------------------------- ----------------------------

------------- -----------------------------------------------------------------
 1 NAME OF REPORTING PERSON

 Castlerigg International Limited
------------- -----------------------------------------------------------------
 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) |_| (b) |_|
------------- -----------------------------------------------------------------
 3 SEC USE ONLY
------------- -----------------------------------------------------------------
 4 SOURCE OF FUNDS

 AF
------------- -----------------------------------------------------------------
 5 CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
 TO ITEMS 2(d) or 2(e) |_|
------------- -----------------------------------------------------------------
 6 CITIZENSHIP OR PLACE OF ORGANIZATION

 British Virgin Islands
------------- -----------------------------------------------------------------
 NUMBER OF 7 SOLE VOTING POWER

 SHARES 0
 ----------- -----------------------------------------------------
BENEFICIALLY 8 SHARED VOTING POWER

 OWNED 2,874,000
 ----------- -----------------------------------------------------
 BY EACH 9 SOLE DISPOSITIVE POWER

 REPORTING 0
 ----------- -----------------------------------------------------
 PERSON 10 SHARED DISPOSITIVE POWER
 2,874,000
 WITH
------------- ----------- -----------------------------------------------------
 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

 2,874,000
------------- -----------------------------------------------------------------
 12 CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
 SHARES |_|
------------- -----------------------------------------------------------------
 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

 5.9%
------------- -----------------------------------------------------------------
 14 TYPE OF REPORTING PERSON

 CO
------------- -----------------------------------------------------------------


---------------------------- ----------------------------
CUSIP No. 303250104 SCHEDULE 13D Page 5 of 9 Pages
---------------------------- ----------------------------

------------- -----------------------------------------------------------------
 1 NAME OF REPORTING PERSON

 Castlerigg International Holdings Limited
------------- -----------------------------------------------------------------
 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) |_| (b) |_|
------------- -----------------------------------------------------------------
 3 SEC USE ONLY
------------- -----------------------------------------------------------------
 4 SOURCE OF FUNDS

 AF
------------- -----------------------------------------------------------------
 5 CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
 TO ITEMS 2(d) or 2(e) |_|
------------- -----------------------------------------------------------------
 6 CITIZENSHIP OR PLACE OF ORGANIZATION

 British Virgin Islands
------------- -----------------------------------------------------------------
 NUMBER OF 7 SOLE VOTING POWER

 SHARES 0
 ----------- -----------------------------------------------------
BENEFICIALLY 8 SHARED VOTING POWER

 OWNED 2,874,000
 ----------- -----------------------------------------------------
 BY EACH 9 SOLE DISPOSITIVE POWER

 REPORTING 0
 ----------- -----------------------------------------------------
 PERSON 10 SHARED DISPOSITIVE POWER
 2,874,000
 WITH
------------- ----------- -----------------------------------------------------
 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

 2,874,000
------------- -----------------------------------------------------------------
 12 CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
 SHARES |_|
------------- -----------------------------------------------------------------
 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

 5.9%
------------- -----------------------------------------------------------------
 14 TYPE OF REPORTING PERSON

 CO
------------- -----------------------------------------------------------------


---------------------------- ----------------------------
CUSIP No. 303250104 SCHEDULE 13D Page 6 of 9 Pages
---------------------------- ----------------------------

------------- -----------------------------------------------------------------
 1 NAME OF REPORTING PERSON

 Thomas E. Sandell
------------- -----------------------------------------------------------------
 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) |_| (b) |_|
------------- -----------------------------------------------------------------
 3 SEC USE ONLY
------------- -----------------------------------------------------------------
 4 SOURCE OF FUNDS

 AF
------------- -----------------------------------------------------------------
 5 CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
 TO ITEMS 2(d) or 2(e) |_|
------------- -----------------------------------------------------------------
 6 CITIZENSHIP OR PLACE OF ORGANIZATION

 Sweden
------------- -----------------------------------------------------------------
 NUMBER OF 7 SOLE VOTING POWER

 SHARES 0
 ----------- -----------------------------------------------------
BENEFICIALLY 8 SHARED VOTING POWER

 OWNED 2,874,000
 ----------- -----------------------------------------------------
 BY EACH 9 SOLE DISPOSITIVE POWER

 REPORTING 0
 ----------- -----------------------------------------------------
 PERSON 10 SHARED DISPOSITIVE POWER
 2,874,000
 WITH
------------- ----------- -----------------------------------------------------
 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

 2,874,000
------------- -----------------------------------------------------------------
 12 CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
 SHARES |_|
------------- -----------------------------------------------------------------
 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

 5.9%
------------- -----------------------------------------------------------------
 14 TYPE OF REPORTING PERSON

 IN
------------- -----------------------------------------------------------------


---------------------------- ----------------------------
CUSIP No. 303250104 SCHEDULE 13D Page 7 of 9 Pages
---------------------------- ----------------------------

 The Schedule 13D filed on June 29, 2007, as amended by Amendment No. 1
filed on October 15, 2007, Amendment No. 2 filed on December 11, 2007, and
Amendment No. 3 filed on December 8, 2008 (the "Schedule 13D") by the Reporting
Persons (as defined below), relating to the common stock, par value $0.01 per
share (the "Common Stock"), of Fair Isaac Corporation, a Delaware corporation
(the "Issuer"), is hereby amended as set forth below by this Amendment No. 4 to
the Schedule 13D. Except as set forth herein, the Schedule 13D is unmodified.

ITEM 4. PURPOSE OF TRANSACTION

Item 4 of the Schedule 13D is hereby amended and supplemented by the addition of
the following paragraphs prior to the penultimate paragraph of such Item 4:

 As of July 24, 2009, Mr. Graziano ceased to be employed by SAMC and as a
result is no longer affiliated with the Reporting Persons. While Mr. Graziano
will remain as a member of the Issuer's board of directors, he will no longer
serve in such capacity as a representative of SAMC or the other Reporting
Persons. The Issuer and the Reporting Persons have amended the Amended and
Restated December 7 Agreement to remove from such Agreement the Reporting
Persons' right, under certain circumstances, to replace three directors named to
the Issuer's board pursuant to such Agreement, and to make certain related
changes.

 The foregoing description of the Amendment No. 1 to the Amended and
Restated December 7 Agreement is a summary only and is qualified in its entirety
by reference to such Amendment No. 1, a copy of which is filed herewith as
Exhibit F and is incorporated by reference into this Item 4.

ITEM 5. INTEREST IN SECURITIES OF THE ISSUER

Paragraphs (a) and (c) of Item 5 of the Schedule 13D are hereby amended and
restated as follows:

(a) Each of Castlerigg Master Investments, SAMC, Castlerigg International,
Castlerigg Holdings and Sandell may be deemed to beneficially own the 2,874,000
shares of Common Stock held by Castlerigg Master Investments, representing
approximately 5.9% of the outstanding shares of Common Stock. The Reporting
Persons may be deemed to be a "group," which "group" may be deemed to
beneficially own an aggregate of 2,874,000 shares of Common Stock, representing
approximately 5.9% of the outstanding shares of Common Stock. The percentages
used herein are based upon the 48,852,923 shares of Common Stock reported to be
outstanding as of April 30, 2009 by the Issuer in its report on Form 10-Q for
the quarterly period ended March 31, 2009, filed with the Securities and
Exchange Commission on May 7, 2009.

(c) No transactions in the shares of Common Stock were effected by the Reporting
Persons during the past sixty days.


---------------------------- ----------------------------
CUSIP No. 303250104 SCHEDULE 13D Page 8 of 9 Pages
---------------------------- ----------------------------

ITEM 6. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH
 RESPECT TO SECURITIES OF THE ISSUER

Item 6 of the Schedule 13D is hereby amended and supplemented by the addition of
the following paragraph:

 As described in Item 4 above, the Issuer and the Reporting Persons have
entered into an Amendment No. 1 to the Amended and Restated December 7 Agreement
to remove from such Agreement the Reporting Persons' right, under certain
circumstances, to replace three directors named to the Issuer's board pursuant
to such Agreement, and to make certain related changes. The foregoing
description of Amendment No. 1 to the Amended and Restated December 7 Agreement
is a summary only and is qualified in its entirety by reference to such
Amendment No. 1, a copy of which is filed herewith as Exhibit F and is
incorporated by reference into this Item 6.

ITEM 7. MATERIAL TO BE FILED AS EXHIBITS

 The following documents are filed as appendices and exhibits:

Appendix III: Information Regarding the Instruction C Persons

Exhibit A: Letter to Issuer's Chief Executive Officer dated June 29, 2007
(previously filed)

Exhibit B: Press release issued by Sandell Asset Management Corp. on
June 29, 2007 (previously filed)

Exhibit C: Agreement by and among the Reporting Persons and the Issuer, dated
as of December 7, 2007 (previously filed)

Exhibit D: Press Release dated December 10, 2007 (previously filed).

Exhibit E: Amended and Restated Agreement by and among the Reporting Persons
and the Issuer, dated as of December 4, 2008 (previously filed).

Exhibit F: Amendment No. 1 to the Amended and Restated Agreement, by and
among the Reporting Persons and the Issuer, dated as of July 29, 2009.


---------------------------- ----------------------------
CUSIP No. 303250104 SCHEDULE 13D Page 9 of 9 Pages
---------------------------- ----------------------------

 Signature

 After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

 Dated: July 29, 2009

 CASTLERIGG MASTER INVESTMENTS LTD.
 By: Sandell Asset Management Corp.,
 as investment manager

 By: /s/ Thomas E. Sandell
 ---------------------
 Thomas E. Sandell, Chief Executive Officer


 SANDELL ASSET MANAGEMENT CORP.

 By: /s/ Thomas E. Sandell
 ---------------------
 Thomas E. Sandell, Chief Executive Officer


 CASTLERIGG INTERNATIONAL LIMITED
 By: Sandell Asset Management Corp.,
 as investment manager

 By: /s/ Thomas E. Sandell
 ---------------------
 Thomas E. Sandell, Chief Executive Officer


 CASTLERIGG INTERNATIONAL HOLDINGS LIMITED
 By: Sandell Asset Management Corp.,
 as investment manager

 By: /s/ Thomas E. Sandell
 ---------------------
 Thomas E. Sandell, Chief Executive Officer


 /s/ Thomas E. Sandell
 ---------------------
 Thomas E. Sandell

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