SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549
                                  SCHEDULE 13G
                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                                (AMENDMENT NO. 6)


                      Fair, Isaac and Company, Incorporated
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                                  Common Stock
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   303250 10 4
- --------------------------------------------------------------------------------
                                 (CUSIP Number)




        Check the following box if a fee is being paid with this statement: [ ].
(A fee is not required only if the filing person:  (1) has a previous  statement
on file reporting beneficial ownership of more than five percent of the class of
securities  described  in Item 1;  and (2) has  filed  no  amendment  subsequent
thereto reporting  beneficial  ownership of five percent or less of such class.)
(See Rule 13d-7.)

        *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 the disclosures provided in a prior cover page.

        The  information  required in 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).


                                Page 1 of 5 Pages




CUSIP No. ........................................................   303250 10 4
- --------------------------------------------------------------------------------

(1)    Names of Reporting Persons S.S. or I.R.S. Identification Nos. of Above 
       Persons
                              Judith Woolsey Isaac
                                   ###-##-####
                            (Social Security Number)

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

(2)    Check the Appropriate Box if a Member of a Group (See Instructions)
       (a)......................................................................
       (b)......................................................................

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

(3)    SEC Use Only.............................................................

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

(4)    Citizenship or Place of
       Organization.................................    United States of America

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

Number of                    (5)    Sole Voting Power
Shares Beneficially                 ...............................    1,711,590
Owned by Each Reporting      ---------------------------------------------------
Person With 
                             (6)    Shared Voting Power
                                    ...............................      247,500
                             ---------------------------------------------------

                             (7)    Sole Dispositive Power
                                    ...............................    1,711,590
                             ---------------------------------------------------

                             (8)    Shared Dispositive Power
                                    ...............................      247,500
- --------------------------------------------------------------------------------

(9)    Aggregate Amount Beneficially Owned by Each Reporting Person
       ............................................................    1,959,090

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

(10)   Check if the Aggregate Amount in Row 9 Excludes Certain Shares (See
       Instructions)...............................................

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

(11)   Percent of Class Represented by Amount in Row 9
       ............................................................        15.5%

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


                              Page 2 of 5 Pages



(12)   Type of Reporting Person (See Instructions) ................           IN
- --------------------------------------------------------------------------------



Item 1 (a)  Name of Issuer:
- ---------------------------
              Fair, Isaac and Company, Incorporated

Item 1 (b)  Address of Issuer's Principal Executive Offices:
- ------------------------------------------------------------
              120 North Redwood Drive
              San Rafael, CA  94903-1996

Item 2 (a)  Name of Person Filing:
- ----------------------------------
              Judith Woolsey Isaac

Item 2 (b)  Address of Principal Business Office:
- -------------------------------------------------
              120 North Redwood Drive
              San Rafael, CA  94903-1996

Item 2 (c)  Citizenship (Place of Organization):
- ------------------------------------------------
              United States of America

Item 2 (d)  Title of Class of Securities:
- -----------------------------------------
              Common Stock

Item 2 (e)  CUSIP Number:
- -------------------------
              303250 10 4

Item 3.     If this statement is filed  pursuant to Rules 13d-1(b), or 13d-2(b),
- -------     check whether the person filing is a:

            (a) [  ]   Broker or Dealer registered under section 15 of the Act

            (b) [  ]   Bank as defined in section 3 (a) (6) of the Act

            (c) [  ]   Insurance Company as defined in section 3 (a) (19) of the
                       Act


                               Page 3 of 5 Pages



            (d) [  ]   Investment Company registered under section 8 of the 
                       Investment Company Act

            (e) [  ]   Investment Adviser registered under section 203 of the 
                       Investment Advisers Act of 1940

            (f) [ ]    Employee  Benefit Plan,  Pension Fund which is subject to
                       the provisions of the Employee Retirement Income Security
                       Act of 1974 or Endowment Fund; see ss.  240.13d-1 (b) (1)
                       (ii) (F)

            (g) [  ]   Parent Holding  Company,  in accordance with ss.240.13d-1
                       (b) (ii) (G) (Note: See Item 7)

            (h) [  ]   Group, in accordance with ss. 240.13d-1 (b) (1) (ii) (H)

Item 4.  Ownership
- ------------------
            (a)   Amount Beneficially Owned:

                                    1,959,090

            (b)   Percent of Class:

                                    15.5%

            (c)   Number of shares as to which such person has:

                    (i)  sole power to vote or to direct the
                         vote ........................................ 1,711,590

                   (ii)  shared power to vote or to direct the
                         vote ........................................   247,500

                  (iii)  sole power to dispose or to direct the
                         disposition of .............................. 1,711,590

                   (iv)  shared power to dispose or to direct the
                         disposition of ..............................   247,500

Item 5.  Ownership of Five Percent or Less of a Class
- -----------------------------------------------------
              If this statement is being filed to report the fact that as of the
              date hereof the reporting  person has ceased to be the  beneficial
              owner of more than five percent of the class of securities,  check
              the following [ ].


                               Page 4 of 5 Pages




Item 6.  Ownership of More than Five Percent on Behalf of Another Person
- ------------------------------------------------------------------------
              Inapplicable.

Item 7.  Identification and Classification of the Subsidiary Which Acquired the 
- -------------------------------------------------------------------------------
         Security Being Reported on By the Parent Holding Company
         --------------------------------------------------------
              Inapplicable.


Item 8.  Identification and Classification of Members of the Group
- ------------------------------------------------------------------
              Inapplicable.


Item 9.  Notice of Dissolution of Group
- ---------------------------------------
              Inapplicable.


Item 10.  Certification
- ------------------------
              Inapplicable.

                                    SIGNATURE

              After  reasonable  inquiry  and to the  best of my  knowledge  and
belief,  I certify that the  information set forth in this statement on Schedule
13G is true, complete and correct.

              Dated:  January 31, 1997

                                                /s/ Judith Woolsey Isaac
                                                --------------------------------
                                                    Judith Woolsey Isaac