EXHIBIT 3.1


                                    RESTATED
                          CERTIFICATE OF INCORPORATION
                                       OF
                     FAIR, ISAAC AND COMPANY, INCORPORATED

                    (As amended effective February 9, 1996)


     The  undersigned,  WILLIAM R. FAIR and EDWARD M. LEWIS,  do hereby certify:

     First:  They are the duly  elected  and  acting  President  and  Secretary,
respectively,  of FAIR, ISAAC AND COMPANY,  INCORPORATED, a Delaware corporation
(the "Corporation").

     Second:  The original  Certificate of  Incorporation of the Corporation was
filed with the Secretary of State on May 15, 1987.

     Third:  The Certificate of  Incorporation of the Corporation is amended and
restated to read in full as  follows:

     1. The name of the corporation is FAIR, ISAAC AND COMPANY, INCORPORATED.

     2. The  address of its  registered  office in the State of Delaware is 1209
Orange Street,  in the City of Wilmington,  County of New Castle 19801. The name
of its registered agent at such address is The Corporation Trust Company.

     3. The nature of the business or purposes to be conducted or promoted is to
engage in any lawful act or activity  for which  corporations  may be  organized
under the Delaware General Corporation Law.

     4. (a) The  total  number  of  shares  of all  classes  of stock  which the
corporation shall have authority to issue is thirty-six million (36,000,000), of
which one million  (1,000,000)  shares shall be Preferred Stock of the par value
of $.01 per share, and thirty-five  million  (35,000,000) shares shall be Common
Stock of the par value of $.01 per  share.  The number of  authorized  shares of
Common Stock or Preferred Stock may be increased or decreased (but not below the
number of shares  thereof  then  outstanding)  if the  increase  or  decrease is
approved by the holders of a majority of the shares of Common Stock, without the
vote of the  holders of the  shares of  Preferred  Stock or any series  thereof,
unless any such Preferred Stock holders are entitled to vote thereon pursuant to
the  provisions  established  by the Board of  Directors  in the  resolution  or
resolutions providing for the issue of such Preferred Stock, and if such holders
of such  Preferred  Stock are so entitled to vote thereon,  then,  except as may
otherwise  be  set  forth  in  this  Certificate  of  Incorporation,   the  only
stockholder approval required shall be that of a majority of the



combined voting power of the Common and Preferred Stock so entitled to vote.

     (b) The Board of  Directors  is  expressly  authorized  to provide  for the
issue,  in one or more series,  of all or any shares of the Preferred Stock and,
in the resolution or resolutions providing for such issue, to establish for each
such series the number of its shares,  which may thereafter (unless forbidden in
the  resolution  or  resolutions  providing  for such  issue)  be  increased  or
decreased  (but not below the number of shares of the series  then  outstanding)
pursuant  to a  subsequent  resolution  of the Board of  Directors,  the  voting
powers, full or limited, of the shares of such series, or that such shares shall
have  no  voting  powers,  and  the  designations,   preferences  and  relative,
participating,  optional or other  special  rights of the shares of such series,
and the qualifications,  limitations or restrictions  thereof. In furtherance of
the  foregoing  authority and not in limitation of it, the Board of Directors is
expressly  authorized,  in the resolution or resolutions providing for the issue
of a series of Preferred  Stock, to make the shares of such series,  without the
consent of the holders of such  shares,  convertible  into or  exchangeable  for
shares of another  class or classes  of stock of the  corporation  or any series
thereof, or redeemable for cash, property or rights,  including securities,  all
on such  conditions  and on such  terms as may be stated in such  resolution  or
resolutions,  and to make any of the voting powers,  designations,  preferences,
rights and  qualifications,  limitations  or  restrictions  of the shares of the
series   dependent  upon  facts   ascertainable   outside  this  Certificate  of
Incorporation.

     (c) Holders of shares of Common  Stock  shall be  entitled to receive  such
dividends or distributions as are lawfully declared on the Common Stock; to have
notice of any authorized meeting of stockholders;  to one vote for each share of
Common  Stock on all  matters  that  are  properly  submitted  to a vote of such
stockholders; and, upon dissolutions of the corporation, to share ratably in the
assets  thereof that may be available for  distribution  after  satisfaction  of
creditors and of the preferences, if any, of any shares of Preferred Stock.

     5.  In  furtherance  and  not in  limitation  of the  powers  conferred  by
statutes,  the Board of  Directors  is expressly  authorized  to make,  alter or
repeal the by-laws of the corporation.

     6. (a) A director of the corporation shall not be liable to the corporation
or its  stockholders  for  monetary  damages for breach of  fiduciary  duty as a
director,  except for  liability  (i) for any breach of the  director's  duty of
loyalty to the corporation or its  stockholders,  (ii) for acts or omissions not
in good faith or which involve intentional  misconduct or a knowing violation of
law, (iii) under Section 174 of the Delaware  General  Corporation  Law, or (iv)
for any  transaction  from  which the  director  derived  an  improper  personal
benefit.



     (b) Each director or officer of the  corporation who was or is made a party
or is  threatened  to be  made a  party  to or is in  any  way  involved  in any
threatened,  pending or completed  action,  suit or  proceeding,  whether  civil
criminal,  administrative  or investigative  (including  without  limitation any
action,  suit or  proceeding  brought by or in the right of the  corporation  to
procure a judgment in its favor)  (hereinafter  a  "proceeding"),  including any
appeal  therefrom,  by reason of the fact that he or she, or a person of whom he
or she is the legal  representative,  is or was a  director  or  officer  of the
corporation or of a subsidiary of the  corporation,  or is or was serving at the
request  of the  corporation  as a director  or  officer  of  another  entity or
enterprise,  or was a director or officer for a foreign or domestic  corporation
which was a predecessor  corporation of the  corporation or of another entity or
enterprise  at the  request  of such  predecessor  corporation,  or by reason of
anything  done or not  done in such  capacity,  shall  be  indemnified  and held
harmless by the  corporation,  and the  corporation  shall  advance all expenses
incurred by any such person in connection with any such proceeding  prior to its
final  determination,  to the fullest extent  authorized by the Delaware General
Corporation  Law. In any  proceeding  against the  corporation  to enforce these
rights,  such person shall be presumed to be entitled to indemnification and the
corporation  shall have the burden of proof to overcome  that  presumption.  The
rights to indemnification  and advancement of expenses conferred by this Article
shall be  presumed to have been relied  upon by  directors  and  officers of the
corporation  in  serving or  continuing  to serve the  corporation  and shall be
enforceable as contract rights.  Said rights shall not be exclusive of any other
rights to which those seeking  indemnification  may  otherwise be entitled.  The
corporation  may, upon written demand  presented by a director or officer of the
corporation or of a subsidiary of the corporation, or by a person serving at the
request  of the  corporation  as a director  or  officer  of  another  entity or
enterprise, enter into contracts to provide such persons with specific rights to
indemnification,  which  contracts  may  confer  rights and  protections  to the
maximum  extent  permitted  by  the  Delaware   General   Corporation  Law.  The
corporation may create trust funds, grant security interests,  obtain letters of
credit, or use other means to ensure payment of such amounts as may be necessary
to  perform  the  obligations  provided  for in this  Article  6 or in any  such
contract.

         (c) Any repeal or  modification  of the  foregoing  provisions  of this
Article 6, including without  limitation any contractual rights arising under or
authorized by it, by the  stockholders  of the  corporation  shall not adversely
affect  any right or  protection  of a director  or  officer of the  corporation
existing at the time of such repeal or modification.

         (d) In  addition  to any vote of the  holders of any class or series of
the  stock  of  this  corporation  required  by law or by  this  Certificate  of
Incorporation,  the  affirmative  vote of the holders of at least 66-2/3% of the
voting  power  of  all of  the  then-outstanding  shares  of  the  stock  of the
corporation  entitled to vote  generally  in the election of  directors,  voting
together as a single class, shall be required to amend or repeal this Article."




         Fourth:  The foregoing  amendment and  restatement  of  Certificate  of
Incorporation has been approved by the Board of Directors of the Corporation.

         Fifth:  The  foregoing  amendment and  restatement  of  Certificate  of
Incorporation  was approved by written  consent of the holder of the outstanding
shares of Common Stock of the Corporation, in accordance with Sections 228, 242,
and 245 of the Delaware General Corporation Law.

         Sixth:  At all  elections  of the  directors of the  corporation,  each
stockholder  shall be entitled to one vote per share entitled to vote multiplied
by the number of directors to be elected,  and the  stockholder  may cast all of
such votes for a single  candidate  or may  distribute  them among the number of
directors to be voted for, or for any two or more of them as the stockholder may
see fit; provided, however, that no stockholder shall be entitled so to cumulate
votes unless such candidate or candidates'  names have been placed in nomination
prior to the voting and the stockholder has given notice at the meeting prior to
the  voting  of the  stockholders  intention  to  cumulate  votes.  If  any  one
stockholder has given such notice, all stockholders may cumulate their votes for
candidates in nomination.