EXHIBIT 4.2

                          REGISTRATION RIGHTS AGREEMENT


         THIS REGISTRATION RIGHTS AGREEMENT (this "Agreement") is made as of the
30th day of September, 1996 by and among FAIR, ISAAC AND COMPANY,  INCORPORATED,
a Delaware corporation (the "Company"), and DONALD J. SANDERS, LAWRENCE E. DUKES
and PAUL A. MAKOWSKI (collectively, the "Stockholders").

         WHEREAS,  the Company,  the  Stockholders  and Credit & Risk Management
Associates,  Inc., a Delaware corporation ("CRMA"),  are parties to that certain
Agreement  and Plan of Merger and  Reorganization,  dated the date  hereof  (the
"Merger  Agreement"),  pursuant to which, among other things, the Company agreed
to issue at the Closing  and in future  distributions,  if any, to  Stockholders
shares (the "Shares") of common stock,  $.01 par value, of the Company  ("Common
Stock") in exchange for all of outstanding capital stock of CRMA; and

         WHEREAS,  in connection with the  transactions  referred to above,  the
Company and the Stockholders desire to provide for the rights of the Holders (as
hereinafter defined) with respect to the registration of the Shares according to
the terms of this Agreement.

         NOW THEREFORE, THE PARTIES HEREBY AGREE AS FOLLOWS:

         1. Definitions.

         1.1 The term "Commission" means the Securities and Exchange  Commission
or any other federal agency at the time administering the Securities Act.

         1.2 The term "Exchange Act" means the Securities  Exchange Act of 1934,
as  amended,  or any  similar  successor  federal  statute  and  the  rules  and
regulations thereunder, all as the same shall be in effect from time to time.

         1.3 The term "Holder" means each of the  Stockholders and any person to
whom the  registration  rights conferred by this Agreement have been transferred
in accordance with Section 9.1 hereof.

         1.4 The terms "register,"  "registered" and  "registration"  refer to a
registration  effected  by  preparing  and filing a  registration  statement  or
similar  document in compliance  with the Securities Act, and the declaration or
ordering of effectiveness of such registration statement or document;

         1.5 The term "Registrable  Securities"  means (i) the Shares,  and (ii)
Common  Stock  issued as a  dividend,  stock  split or other  distribution  with
respect  to, or in exchange  for or in  replacement  of, the  Shares;  provided,
however,  that any shares previously sold to the public pursuant to a registered
public  offering or pursuant to Rule 144 under the Securities Act shall cease to
be Registrable Securities.

         1.6 The term  "Securities  Act" means the  Securities  Act of 1933,  as
amended,  or any similar successor federal statute and the rules and regulations
thereunder, all as the same shall be in effect from time to time.

         2. Registration.

         2.1  During  each  twelve-month  period  following  the  closing of the
transaction contemplated by the Merger Agreement, the Holders collectively shall
have  (a)  the  right  to  request  one  registration  of  Holders'  Registrable
Securities for an offering to be made on a continuous basis pursuant to Rule 415
under the Securities Act or,  alternatively (b) to register Holders' Registrable
Securities in connection with one other  registration  otherwise effected by the
Company.  Any such request  shall be made in writing by the Holder or Holders of
at least a majority of the Registrable  Securities and shall state the number of
shares of Registrable  Securities to be disposed of and the intended  methods of
disposition  of such  shares by such  Holder  or  Holders.  Notwithstanding  the
foregoing,  the Company  shall not be obligated to effect any such  registration
pursuant  to clause (a) if the Holder or Holders  requesting  such  registration
propose to sell less than 12,500 Shares. If the Company is requested to effect a
registration  in  accordance  with Section  2.1(a),  regardless of the number of
shares for which registration is initially requested, and thirty days in advance
of filing any registration statement initiated by the Company, the Company shall
promptly give written notice of such requested  registration to all Holders (the
"Company Notice"), who shall be permitted to join in such requested registration
upon  written  notice  (which  notice  shall  also state the number of shares of
Registrable   Securities  to  be  disposed  of  and  the  intended   methods  of
distribution) to the Company delivered within 10 days of the date of the Company
Notice.

         2.2 The  registrations  provided  for in  Section  2.1(a)  shall not be
underwritten.

         3. Obligations of the Company.

         Whenever  requested  under Section 2.1 of this  Agreement to effect the
registration of any Registrable Securities,  the Company shall, as expeditiously
as reasonably possible:

         3.1 Prepare and file with the Commission a registration  statement with
respect to such  Registrable  Securities and use its reasonable  best efforts to
cause  such  registration   statement  to  become   effective,   and  keep  such
registration statement continuously effective under the Securities Act until the
earlier  of  the  expiration  of 60  days  after  the  date  of  declaration  of
effectiveness of such registration  statement by the Commission (the "Expiration
Date") or the date on which this Agreement has terminated  pursuant to Section 7
of this  Agreement with respect to all Holders of  Registrable  Securities.  The
Company's obligations  hereunder to file a registration  statement and to keep a
registration  statement continuously effective under the Securities Act shall be
suspended if (i) the fulfillment of such  obligations  would require the Company
to make a disclosure  that would,  in the  reasonable  judgment of the Company's
Board of  Directors,  be  detrimental  to the  Company and  premature,  (ii) the
Company has filed or proposes to file within thirty (30) days after receipt of a
request for registration  pursuant to Section 2.1 a registration  statement with
respect to any of its  securities to be distributed  in an  underwritten  public
offering and it is advised by its lead or managing  underwriter that an offering
by a Holder or Holders of Registrable  Shares would materially  adversely affect
the  distribution  of  such  securities,   or  (iii)  the  fulfillment  of  such
obligations  would  require  the  Company to prepare  financial  statements  not
required to be prepared for the Company to comply with its obligations under the
Exchange Act. Such obligations shall be reinstated (x) in the case of clause (i)
above,  upon the making of such disclosure by the Company (or, if earlier,  when
such disclosure  would either no longer be necessary for the fulfillment of such
obligations or no longer be detrimental),  (y) in the case of clause (ii) above,
upon the  conclusion of any period during which the Company would not,  pursuant
to the terms of its underwriting arrangements, be permitted to sell Common Stock
for its own account  and (z) in the case of clause  (iii)  above,  as soon as it
would no longer be necessary to prepare such financial statements to comply with
the Securities  Act. The Expiration Date shall be tolled for the duration of any
suspension  pursuant  to this  Section  3.1 and for the  duration  of any period
described  in  clauses  (i) - (iv) of Section  4.2 below.  In the event that the
Company's obligations are suspended as provided above, the Company shall deliver
a certificate  in writing,  signed by an officer of the Company,  to each Holder
participating  in such  registration,  which  shall  state that its  obligations
hereunder have been suspended in accordance  with this Section 3.1 and the basis
for such suspension.

         3.2  Prepare  and  file  with  the  Commission   such   amendments  and
supplements to such registration statement and the prospectus used in connection
with  such  registration  statement  as may be  necessary  to  comply  with  the
provisions  of  the  Securities  Act  with  respect  to the  disposition  of all
securities covered by such registration statement.

         3.3 Furnish to the Holders covered by such registration  statement such
numbers  of copies of a  prospectus,  including  a  preliminary  prospectus,  in
conformity with the requirements of the Securities Act, and such other documents
as they may reasonably  request in order to facilitate  the  disposition of such
Registrable Securities.

         3.4 Use its  reasonable  best  efforts  to  register  and  qualify  the
securities covered by such registration statement under such other securities or
Blue Sky laws of such  jurisdictions  as shall be  reasonably  requested  by the
Holders  thereof,  provided that the Company shall not be required in connection
therewith  or as a  condition  thereto to qualify  to do  business  or to file a
general consent to service of process in any such states or jurisdictions.

         4. Obligations of the Holders.

         4.1 It shall be a condition precedent to the obligations of the Company
to take any action  pursuant to this  Agreement  that the selling  Holders shall
furnish to the Company such information  regarding  themselves,  the Registrable
Securities  held by  them,  and  the  intended  method  of  disposition  of such
securities as shall be required to effect the  registration  of the  Registrable
Securities.

         4.2 Upon the  receipt by a Holder of any notice from the Company of (i)
the existence of any fact or the happening of any event as a result of which the
prospectus included in a registration  statement filed pursuant to Section 2, as
such registration statement is then in effect, includes an untrue statement of a
material fact or omits to state a material fact required to be stated therein or
necessary  to make the  statements  therein not  misleading  in the light of the
circumstances then existing, (ii) the existence of any facts or events resulting
in the  suspension of the  Company's  obligations  to file and keep  effective a
registration  statement as provided in Section 3.1 above,  (iii) the issuance by
the SEC of any stop order or  injunction  suspending or enjoining the use or the
effectiveness  of  such   registration   statement  or  the  initiation  of  any
proceedings  for that  purpose,  or the  taking  of any  similar  action  by the
securities regulators of any state or other jurisdiction, or (iv) the request by
the Commission or any other federal or state governmental  agency for amendments
or  supplements  to such  registration  statement or related  prospectus  or for
additional  information related thereto, such Holder shall forthwith discontinue
disposition of such Holder's Registrable Securities covered by such registration
or  prospectus  (other  than  in  transactions   exempt  from  the  registration
requirements  under the  Securities  Act)  until  such  Holder's  receipt of the
supplemented or amended prospectus or until such Holder is advised in writing by
the Company that the use of the applicable  prospectus may be resumed or, in the
case of a notice pursuant to clause (ii) above, until the Company's  obligations
referred to therein are no longer suspended;  provided, however, that, except in
the  circumstances  described in clause (ii) above,  the Company shall take such
reasonable  actions  as are  necessary  to permit  the  Holders  to  resume  the
disposition of their Registrable Securities at the earliest practicable time.

         5. Expenses.

         The Company shall bear and pay all expenses  incurred by the Company in
connection  with  any  registration,  filing  or  qualification  of  Registrable
Securities  with  respect to any  registration  pursuant to Section 2 hereof for
each Holder thereof, including (without limitation) all registration, filing and
qualification  fees,  printers' and  accounting  fees relating or  apportionable
thereto,  fees and  disbursements of counsel for the Company,  blue sky fees and
expenses,  including fees and  disbursements  of counsel related to all blue sky
matters,  but  excluding the fees and  disbursements  of counsel for the selling
Holders,  stock transfer taxes that may be payable by the selling  Holders,  and
all brokerage or similar commissions relating to Registrable  Securities,  which
shall be borne by the selling Holders.

         6. Indemnification.

         In the event any Registrable  Securities are included in a registration
statement under this Agreement:

         6.1 To the extent permitted by law, the Company will indemnify and hold
harmless each Holder of such Registrable Securities and each person, if any, who
controls  such Holder within the meaning of the  Securities  Act or the Exchange
Act, against any losses,  claims,  damages or liabilities  (joint or several) to
which they may become  subject  under the  Securities  Act,  the Exchange Act or
other  federal  or  state  law,  insofar  as such  losses,  claims,  damages  or
liabilities  (or actions in respect  thereof) arise out of or are based upon any
of  the  following  statements,   omissions  or  violations   (collectively,   a
"Violation"): (i) any untrue statement or alleged untrue statement of a material
fact  contained  in  such  registration  statement,  including  any  preliminary
prospectus  or  final  prospectus   contained   therein  or  any  amendments  or
supplements  thereto,  (ii) the omission or alleged  omission to state therein a
material fact required to be stated therein, or necessary to make the statements
therein not  misleading,  or (iii) any  violation  or alleged  violation  by the
Company of the Securities Act, the Exchange Act, any state securities law or any
rule or regulation promulgated under the Securities Act, the Exchange Act or any
state  securities  law;  and the  Company  will  reimburse  each such  Holder or
controlling person for any legal or other expenses  reasonably  incurred by them
in connection  with  investigating  or defending any such loss,  claim,  damage,
liability or action;  provided,  however, that the indemnity agreement contained
in this  Section 6.1 shall not apply to amounts paid in  settlement  of any such
loss, claim, damage,  liability or action if such settlement is effected without
the consent of the Company (which consent shall not be  unreasonably  withheld),
nor shall the  Company  be  liable  in any such case for any such  loss,  claim,
damage, liability or action to the extent that it arises out of or is based upon
a  Violation  which  occurs in  reliance  upon and in  conformity  with  written
information  furnished expressly for use in connection with such registration by
any such Holder or controlling person.

         6.2 To the extent  permitted by law, each selling Holder will indemnify
and hold harmless the Company,  each of its directors,  each of its officers who
have signed the registration  statement,  each person,  if any, who controls the
Company within the meaning of the  Securities  Act, and any other Holder selling
securities in such registration statement or any of its directors or officers or
any person who controls  such  Holder,  against any losses,  claims,  damages or
liabilities  (joint or  several)  to which  the  Company  or any such  director,
officer or  controlling  person,  or such other Holder or  director,  officer or
controlling  person may become  subject,  under the Securities Act, the Exchange
Act or other federal or state law,  insofar as such losses,  claims,  damages or
liabilities  (or actions in respect  thereto) arise out of or are based upon any
Violation,  in each  case to the  extent  (and  only to the  extent)  that  such
Violation  occurs in reliance  upon and in conformity  with written  information
furnished by such indemnifying  Holder expressly for use in connection with such
registration;  and each such  indemnifying  Holder will  reimburse  any legal or
other expenses reasonably incurred by the Company or any such director, officer,
controlling person,  underwriter or controlling person,  other Holder,  officer,
director,  or controlling  person in connection with  investigating or defending
any such loss, claim, damage, liability, or action; provided,  however, that the
indemnity  agreement  contained  in this  Section 6.2 shall not apply to amounts
paid in settlement of any such loss, claim, damage,  liability or action if such
settlement is effected  without the consent of the  indemnifying  Holder,  which
consent shall not be unreasonably withheld; provided, that in no event shall any
indemnity  under this  Section  6.2 exceed the gross  proceeds  received by such
Holder from the sale of  Registrable  Securities  pursuant to such  registration
statement.

         6.3 Promptly after receipt by an indemnified party under this Section 6
of notice of the commencement of any action (including any governmental action),
such indemnified party will, if a claim in respect thereof is to be made against
any indemnifying party under this Section 6, deliver to the indemnifying party a
written notice of the commencement thereof and the indemnifying party shall have
the right to  participate  in,  and,  to the  extent the  indemnifying  party so
desires,  jointly with any other indemnifying party similarly noticed, to assume
the defense thereof with counsel mutually satisfactory to the parties; provided,
however,  that an  indemnified  party  shall  have the right to  retain  its own
counsel,  with the fees and expenses to be paid by the  indemnifying  party,  if
representation  of  such  indemnified  party  by  the  counsel  retained  by the
indemnifying  party would be inappropriate due to actual or potential  differing
interests between such indemnified party and any other party represented by such
counsel  in such  proceeding.  The  failure  to  deliver  written  notice to the
indemnifying  party within a  reasonable  time of the  commencement  of any such
action, if prejudicial to its ability to defend such action,  shall relieve such
indemnifying  party of any liability to the indemnified party under this Section
6, but the omission so to deliver written notice to the indemnifying  party will
not  relieve  it of any  liability  that it may  have to any  indemnified  party
otherwise than under this Section 6.

         6.4 The  obligations  of the Company and Holders  under this  Section 6
shall  survive the  completion  of any offering of  Registrable  Securities in a
registration statement under this Agreement, and otherwise.

         7. Termination of Registration Rights.

         The Company's obligations pursuant to this Agreement shall terminate as
to any Holder of Registrable  Securities on the earlier of (i) the date when the
Holder  can sell all of such  Holder's  shares  pursuant  to Rule 144  under the
Securities Act during any 90-day period or (ii) on the second anniversary of the
final  distribution  of  Shares  to the  Stockholders  pursuant  to  the  Merger
Agreement.

         8. Representations, Warranties and Other Covenants of the Company.

         The  Company   hereby   represents,   warrants  and  covenants  to  the
Stockholders that:

         8.1 When  issued in  accordance  with the terms and  conditions  of the
Merger   Agreement,   the  Shares  will  be  validly  issued,   fully  paid  and
non-assessable.

         8.2 The  Company is current in making all filings  with the  Commission
required by law, and in the last 12 months, on a timely basis, has made all such
filings,  and as of the date hereof is  eligible  to register  the resale of the
Shares by the Holders on Form S-3.

         8.3 The Company shall cause the legend on Shares to be removed upon the
request  of any  holder  thereof  at any time  after two years  from the date of
issuance,  if the holder is not at the time of the request, and had not been for
the three months previous thereto, an affiliate of the Company.

         9. Miscellaneous.

         9.1  Successors  and Assigns.  This Agreement and all of the provisions
hereof  shall  inure  to the  benefit  of and be  binding  upon  the  respective
successors and assigns of the parties hereto, but neither this Agreement nor any
of the rights,  interests or obligations hereunder may be assigned,  transferred
or  delegated   by  any  Holder  to  any  person   other  than  (i)   executors,
administrators,  legatees  or heirs  of such  Holder  and  (ii) to a  charitable
remainder  trust  described in Section 664 of the Internal  Revenue Code, all of
the income  beneficiaries  of which are such Holder or members of such  Holder's
immediate family. Nothing in this Agreement,  express or implied, is intended to
confer  upon  any  party  other  than the  parties  hereto  or their  respective
successors  or  permitted  assigns,  any  rights,  remedies,   obligations,   or
liabilities under or by reason of this Agreement,  except as expressly  provided
in this Agreement.

         9.2 Notices.  Unless otherwise provided, any notice, request, demand or
other communication required or permitted under this Agreement shall be given in
writing  and shall be deemed  effectively  given upon  personal  delivery to the
party to be notified,  or when sent by telecopier (with receipt  confirmed),  or
overnight  courier service,  or upon deposit with the United States Post Office,
by registered or certified mail, postage prepaid and addressed as follows (or at
such other address as a party may designate by notice to the other):

If to the Company:

         Fair, Isaac and Company, Incorporated
         120 North Redwood Drive
         San Rafael, CA 94903
         Telecopier: (415) 479-6320
         Attention:  Peter L. McCorkell
         with a copy to:

         Pillsbury Madison & Sutro LLP
         235 Montgomery Street
         San Francisco, CA 94104
         Telecopier: (415) 983-1200
         Attention:  Blair W. White, Esq.

If to the Stockholders:

         c/o Credit & Risk Management Associates, Inc.
         100 E. Pratt Street, Suite 1600
         Baltimore, Maryland  21202

         with a copy to:

         Miles & Stockbridge, P.C.
         10 Light Street
         Baltimore, MD  21202-1487
         Telecopier: (410) 385-3700
         Attention: Mark S. Demilio, Esq.

         9.3 Waivers. The observance of any term of this Agreement may be waived
(either  generally  or in a  particular  instance  and either  retroactively  or
prospectively)  only with the  written  consent of the party  against  whom such
waiver is sought to be  enforced.  No waiver by either party of any default with
respect to any provision,  condition or requirement hereof shall be deemed to be
a continuing  waiver in the future  thereof or a waiver of any other  provision,
condition or requirement hereof; nor shall any delay or omission of either party
to exercise any right  hereunder  in any manner  impair the exercise of any such
right accruing to it thereafter.

         9.4 Severability.  If one or more provisions of this Agreement are held
to be unenforceable,  invalid or void by a court of competent jurisdiction, such
provision  shall  be  excluded  from  this  Agreement  and the  balance  of this
Agreement  shall be  interpreted as if such provision were so excluded and shall
be enforceable in accordance with its terms.

         9.5      Entire Agreement; Amendments.

                  (a) This Agreement  contains the entire  understanding  of the
parties  with respect to the matters  covered  herein and  supersedes  all prior
agreements and understandings,  written or oral, between the parties relating to
the subject matter hereof.

                  (b)  Any  term  of  this  Agreement  may be  amended  and  the
observance of any term of this Agreement may be waived (either generally or in a
particular  instance and either  retroactively or prospectively),  only with the
written  consent of the Company and the holders of a majority of the Registrable
Securities then outstanding. Any amendment or waiver effected in accordance with
this paragraph shall be binding upon each holder of any  Registrable  Securities
then outstanding, each future Holder of all such Registrable Securities, and the
Company.

         9.6 Governing  Law. This  Agreement  shall be governed by and construed
under the laws of the State of  California  (irrespective  of its  choice of law
principles).

         9.7  Counterparts.  This  Agreement  may be  executed  in  two or  more
counterparts,  each of  which  shall be  deemed  an  original,  but all of which
together shall constitute one and the same instrument.

         9.8  Titles  and  Subtitles.  The  titles  and  subtitles  used in this
Agreement  are  used  for  convenience  only  and  are not to be  considered  in
construing or interpreting this Agreement.  Any reference in this Agreement to a
statutory provision or rule or regulation promulgated thereunder shall be deemed
to include any  similar  successor  statutory  provision  or rule or  regulation
promulgated thereunder.




         IN WITNESS WHEREOF,  the parties have executed this Agreement as of the
date first above written.


                              FAIR, ISAAC AND COMPANY, INCORPORATED


                              By:  /s/ Peter L. McCorkell
                                   -----------------------------------------
                                   Name:  Peter L. McCorkell
                                   Title: Senior Vice President & Secretary



                              /s/ Donald J. Sanders
                              ----------------------------------------------
                              Donald J. Sanders
                              Address:


                              /s/ Lawrence E. Dukes
                              ----------------------------------------------
                              Lawrence E. Dukes
                              Address:


                              /s/ Paul A. Makowski
                              ----------------------------------------------
                              Paul A. Makowski
                              Address: