EXHIBIT 10.24


                  THIS SEVERANCE AGREEMENT AND RELEASE,  made as of February 28,
1997 by and between DENNIS G. SISCO(hereinafter referred to as "Employee"),  and
COGNIZANT CORPORATION  (hereinafter deemed to include its worldwide subsidiaries
and affiliates and referred to as "the Company").

                  WITNESSETH THAT:

                  WHEREAS, Employee has been employed by the Company since the
                     date specified in Appendix I; and

                  WHEREAS, the parties to this Agreement desire to enter into an
agreement  in order to  provide  certain  benefits  and salary  continuation  to
Employee;

                  NOW,  THEREFORE,  in consideration of the mutual covenants and
promises  hereinafter  provided and of the actions taken pursuant  thereto,  the
parties agree as follows:


         1.  Employee  shall assume  inactive  employee  status with the Company
effective  on the date  specified  in  Appendix  I.  From and after  that  date,
Employee shall have no further responsibilities as an officer or employee of the
Company.  Effective on the "Effective Date of Resignation" specified in Appendix
I, Employee's employment with the Company shall terminate. In furtherance of the
foregoing, Employee agrees, upon request of the Company, to execute such written
resignations as the Company may require in order that Employee's  positions with
the Company,  its  subsidiaries  and  affiliates,  may be  terminated  as of the
Effective Date of Resignation.  Notwithstanding the foregoing, Employee shall be
entitled to remain on the Boards of Directors  of the  companies  identified  in
Appendix I unless and until removed by their respective  shareholders.  Employee
shall not be acting as a  representative  of the Company on any of the Boards of
Directors identified on Appendix I.

         2.  Effective on the date set forth in Appendix I,  Employee  will have
the status of an  inactive  employee  within the  meaning of Section  2.4 of the
Cognizant  Corporation  Executive  Transition Plan (the "Plan"),  a summary plan
description of which Employee hereby acknowledges receipt. On the Effective Date
of Resignation,  Employee shall incur an "Eligible  Termination"  under the Plan
and will, accordingly,  be entitled to the benefits set forth therein subject to
the terms and  conditions of such Plan.  In  accordance  with Section 2.4 of the
Plan,  amounts paid to Employee during his period of inactive status will offset
any benefits payable under the Plan. A summary of the benefits to which Employee
is entitled under the Plan is set forth in Appendix I.

         3. Through the Termination  Date specified in Appendix I, Employee will
be reasonably  available to consult on matters,  and will  cooperate  fully with
respect to any claims, litigation or investigations, relating to the Company. No
reimbursement  for  expenses  incurred  after  the  commencement  of a period of
inactive  employee status,  or if there is no such period,  after termination of
employment,  shall be made to  Employee  unless  authorized  in  advance  by the
Company.

         4. Employee  agrees that until the  Termination  Date Employee will not
become a  stockholder  (unless  such  stock is listed on a  national  securities
exchange  or  traded on a daily  basis in the  over-the-counter  market  and the
Employee's ownership interest is not in excess of 5% of the company whose shares
are being purchased), member, employee, officer, director or consultant of or to
a Competing Business (as defined below); nor if Employee becomes associated with
a company,  partnership or individual  which company,  partnership or individual
acts as a consultant to a Competing  Business will Employee  provide services to
such Competing  Business.  The  restrictions  contained in this paragraph  shall
apply  whether  or not  Employee  accepts  any form of  compensation  from  such
competing  entity or  consultant.  The foregoing  provisions  shall not prohibit
Employee from becoming a stockholder,  employee, officer, director or consultant
of or to a  corporation,  or a member or an  employee  of or a  consultant  to a
partnership or other  business or firm,  primarily  engaged in venture  capital,
equity  or  debt-based  investing  so long as the  Employee  does  not act as an
executive officer (or member of senior  management) of any Competing Business in
which such  corporation,  partnership,  business or firm invests.  Employee also
agrees that,  until the Termination  Date,  Employee will not recruit or solicit
any customers of the Company to become customers of any Competing  Business.  In
addition,  Employee agrees that until the Termination  Date neither Employee nor
any company or entity Employee controls or manages, shall recruit or solicit any
employee of the Company to become an employee of any business entity. As used in
this  paragraph 4, the term  "Competing  Business"  shall mean any  corporation,
partnership,  business or entity which  competes  with any business in which the
Company owns, directly or indirectly, a controlling interest as of the Effective
Date of Resignation.

         5. If Employee  performs  services for an entity other than the Company
at any time prior to the  Termination  Date  (whether  or not such  entity is in
competition with the Company),  Employee shall notify the Company on or prior to
the  commencement  thereof.  To  "perform  services"  shall mean  employment  or
services as a full-time employee,  consultant,  owner, partner, associate, agent
or  otherwise  on  behalf  of  any  person,  principal,   partnership,  firm  or
corporation.  For  purposes  of this  paragraph  5 only,  "Company"  shall  mean
Cognizant  Corporation and any other affiliated entity which has been designated
to participate in The Cognizant Corporation Career Transition Plan.

         6.  Employee  agrees that  Employee  will not  directly  or  indirectly
disclose any proprietary or confidential  information,  records, data, formulae,
specifications  and other trade  secrets  owned by the Company,  whether oral or
written,  to any person or use any such  information,  except  pursuant to court
order (in which case Employee will first provide the Company with written notice
of such). All records, files, drawings,  documents, models, disks, equipment and
the like  relating  to the  businesses  of the  Company  shall  remain  the sole
property  of the  Company  and shall not be  removed  from the  premises  of the
Company.  Employee  further  agrees to return to the Company any property of the
Company which  Employee may have, no matter where  located,  and not to keep any
copies or portions thereof.  However,  Employee may retain his  Company-provided
Macintosh personal computer system and related software,  cellular telephone and
pager.

         7.  Neither   Employee  nor  the  Company  shall  make  any  derogatory
statements  about  the  other.  Employee  shall  not  make any  written  or oral
statement,  news release or other announcement relating to Employee's employment
by the  Company or relating  to the  Company,  its  subsidiaries,  customers  or
personnel, which is designed to embarrass or criticize any of the foregoing. The
Company  shall not make any  written or oral  statement,  news  release or other
announcement  relating to Employee or Employee's employment by the Company which
is designed to embarrass or criticize Employee.

         8. (a) (i) The  stock  options  granted  to  Employee  pursuant  to the
Company's  Replacement Plan For Certain  Employees  Holding The Dun & Bradstreet
Corporation  Equity  Based Awards (the  "Replacement  Plan") which are listed on
Appendix II shall be cancelled and replaced with options ("Substitute  Options")
to purchase an equivalent  number of shares of the Company's  Common Stock under
the Company's Key Employees Stock Incentive Plan (the "Stock  Incentive  Plan").
Such Substitute  Options shall be granted at the prices set forth in Appendix II
(which  prices are not less than the fair market  value on April 15,  1997,  the
date of the  approval  of  such  reissuance  by the  Compensation  and  Benefits
Committee  of the  Company's  Board  of  Directors)  but  shall  otherwise  have
substantially the same terms as the options they replace.

                    (ii)  Employees'  termination  under this Agreement shall be
deemed to be a "Retirement"  under the Stock  Incentive Plan and that portion of
Employee's stock options granted pursuant to the Stock Incentive Plan that would
otherwise  vest on November 6, 2002,  shall be accelerated so as to vest ratably
on each of the five preceding November 6ths. The foregoing  provisions shall not
apply to any other health, welfare or other benefit plan of the Company.

                  (iii)  Notwithstanding  the provisions of clauses (i) and (ii)
of this paragraph,  the Employee hereby elects to forfeit options to purchase an
aggregate of 54,615 shares of the Company's Common Stock at an exercise price of
$33.375 per share which were  purchased by the Employee on or about November 15,
1996. By virtue of such  forfeiture,  the Employee shall be entitled to a refund
by the Company of $182,278  representing the purchase price of the options being
forfeited.

                  (iv) For  purposes  of the  Company's  Supplemental  Executive
Retirement  Plan,  the  Employee  shall be deemed to have  completed 10 years of
service as of the date of his termination of employment. Amounts paid or payable
to the Employee pursuant to this Agreement or the Plan shall not be included for
purposes of computing any benefits  under any benefit plan of the Company or any
of its predecessors  (including the Supplemental Executive Retirement Plan). The
amount of the  Employee's  benefits  payable at age 55 are set forth in Appendix
IV.

         (b) For purposes of the  acceleration  provisions of  Employee's  stock
options granted pursuant to the Stock Incentive Plan,  "Change in Control" shall
mean:

                  (i) any  "Person," as such term is defined in Section  3(a)(9)
of the Securities  Exchange Act of 1934, as amended (the "Exchange  Act") (other
than the Company,  any trustee or other fiduciary  holding  securities  under an
employee  benefit  plan  of the  Company,  or any  company  owned,  directly  or
indirectly,  by the  stockholders  of the  Company  in  substantially  the  same
proportions as their ownership of stock of the Company), becomes the "Beneficial
Owner"  (as  defined  in  Rule  13d-3  under  the  Exchange  Act),  directly  or
indirectly,  of  securities  of the  Company  representing  20% or  more  of the
combined voting power of the Company's then outstanding securities;

                  (ii) during any period of  twenty-four  months (not  including
any period prior to the  execution of this  Agreement),  individuals  who at the
beginning of such period  constitute the Board, and any new director (other than
(A) a director  nominated by a Person who has entered into an agreement with the
Company to effect a transaction  described in Section  (8)(b)(i),  (iii) or (iv)
hereof,  (B) a director  nominated  by any Person  (including  the  Company) who
publicly   announces  an  intention  to  take  or  to  consider  taking  actions
(including,  but not limited to, an actual or threatened proxy contest) which if
consummated would constitute a Change in Control or (C) a director  nominated by
any Person who is the Beneficial Owner, directly or indirectly, of securities of
the  Company  representing  10% or  more of the  combined  voting  power  of the
Company's  securities) whose election by the Board or nomination for election by
the  Company's  stockholders  was  approved  in  advance  by a vote of at  least
two-thirds (2/3) of the directors then still in office who either were directors
at the beginning of the period or whose  election or nomination for election was
previously  so approved,  cease for any reason to constitute at least a majority
thereof;

                  (iii) the  stockholders of the Company approve any transaction
or series of transactions under which the Company is merged or consolidated with
any other company,  other than a merger or consolidation  (A) which would result
in the voting  securities of the Company  outstanding  immediately prior thereto
continuing to represent  (either by remaining  outstanding or by being converted
into  voting  securities  of the  surviving  entity)  more  than  66 2/3% of the
combined voting power of the voting  securities of the Company or such surviving
entity outstanding  immediately after such merger or consolidation and (B) after
which  no  Person  holds  20%  or  more  of the  combined  voting  power  of the
then-outstanding securities of the Company or such surviving entity; or

                  (iv)  the  stockholders  of the  Company  approve  a  plan  of
complete  liquidation of the Company or an agreement for the sale or disposition
by the Company of all or substantially all of the Company's assets.

         (c)  Employee has served at the request of the Company as a director of
certain companies in which the Company has an investment. While Employee will no
longer serve as the Company's  representative  with respect to those  Companies,
Employee agrees that any stock options or other  remuneration  received prior to
the  date  he  assumed  inactive   employment  status  in  the  course  of  such
representation  will continue to be held by Employee on behalf of the Company in
accordance  with the Company's  policies.  Specifically,  in the case of options
granted to Employee by Aspect  Development,  Inc. and Oacis Healthcare  Systems,
Inc.,  Employee  will  exercise  such options only upon the  instruction  of the
Company and the advance by the Company of the exercise  price  therefor and will
surrender to the Company any shares so acquired on exercise.  Employee also will
not to take any action which would cause such  options to terminate  without the
prior  consent  of the  Company.  To the  extent  Employee  is treated as having
received  taxable  income with respect to any cash or property he is required to
surrender to the Company,  the Company will indemnify and hold Employee harmless
for any taxes due as a result thereof.

         9. The Company shall also reimburse  Employee for the reasonable  costs
of seeking and securing new employment. Such costs may include telephone, travel
and lodging not  reimbursed by others,  mail and courier  services,  secretarial
services,  legal services,  and career counselling  (collectively,  and together
with office space "Outplacement Services").  The aggregate value of Outplacement
Services shall not exceed $60,000.

         10.  Employee  agrees that in the event of any  material  breach of the
covenants  contained in  paragraphs 3, 4, 5, 6 or 7, in addition to any remedies
that may be  available  to the  Company,  the  Company  may cease  all  payments
required  to be made to  Employee  under the  Plan,  recover  all such  payments
previously  made to  Employee  pursuant  to the Plan and treat  options  granted
pursuant  to the  Stock  Incentive  Plan and the  Replacement  Plan as  expiring
pursuant to Sections 7(f) and 6(g) thereof, respectively. The parties agree that
any such breach would cause injury to the Company  which  cannot  reasonably  or
adequately be quantified  and that such relief does not  constitute in any way a
penalty or a forfeiture.

         11.  Employee,  for  Employee,   Employee's  family,   representatives,
successors  and  assigns  releases  and forever  discharges  the Company and its
successors, assigns, subsidiaries,  affiliates,  directors, officers, employees,
attorneys,  agents and trustees or  administrators  of any Company plan from any
and all claims, demands, debts, damages,  injuries,  actions or rights of action
of any nature whatsoever,  whether known or unknown, which Employee had, now has
or  may  have  against  the  Company,  its  successors,  assigns,  subsidiaries,
affiliates,  directors,  officers, employees,  attorneys, agents and trustees or
administrators of any Company plan, from the beginning of Employee's  employment
to and  including  the date of this  Agreement  relating  to or  arising  out of
Employee's  employment  with the Company or the  termination of such  employment
other than a claim with respect to a vested  right  Employee may have to receive
benefits under any plan maintained by the Company or any of Employee's rights or
the  Company's  obligations  under  this  Agreement.  Employee  represents  that
Employee has not filed any action,  complaint,  charge, grievance or arbitration
against the Company or any of its successors, assigns, subsidiaries, affiliates,
directors, officers, employees, attorneys, agents and trustees or administrators
of any Company plan.

         12.  Employee  covenants that neither  Employee,  nor any of Employee's
respective  heirs,  representatives,   successors  or  assigns,  will  commence,
prosecute or cause to be commenced or  prosecuted  against the Company or any of
its  successors,   assigns,  subsidiaries,   affiliates,   directors,  officers,
employees,  attorneys, agents and trustees or administrators of any Company plan
any action or other proceeding based upon any claims, demands, causes of action,
obligations,  damages or liabilities which are being released by this Agreement,
nor will Employee seek to challenge the validity of this Agreement,  except that
this  covenant  not to sue does not affect  Employee's  future  right to enforce
appropriately the terms of this Agreement in a court of competent jurisdiction.

         13. Employee acknowledges that (a) Employee has been advised to consult
with an attorney at Employee's own expense  before  executing this Agreement and
that Employee has been advised by an attorney or has knowingly waived Employee's
right to do so, (b) Employee has had a period of at least  twenty-one  (21) days
within which to consider this Agreement,  (c) Employee has a period of seven (7)
days from the date that Employee signs this Agreement  within which to revoke it
and that this  Agreement  will not become  effective  or  enforceable  until the
expiration  of  this  seven  (7)  day  revocation  period,  (d)  Employee  fully
understands  the terms and contents of this  Agreement and freely,  voluntarily,
knowingly  and without  coercion  enters into this  Agreement,  (e)  Employee is
receiving  greater  consideration  hereunder  than  Employee  would  receive had
Employee not signed this Agreement and that the consideration hereunder is given
in exchange  for all of the  provisions  hereof and (f) the waiver or release by
Employee  of rights or claims  Employee  may have  under  Title VII of the Civil
Rights Act of 1964, The Employee Retirement Income Security Act of 1974, the Age
Discrimination  in Employment Act of 1967, the Older Workers Benefit  Protection
Act, the Fair Labor  Standards  Act, the Americans  with  Disabilities  Act, the
Rehabilitation  Act, the Worker Adjustment and Retraining  Notification Act (all
as amended) and/or any other local, state or federal law dealing with employment
or the termination  thereof is knowing and voluntary and,  accordingly,  that it
shall be a breach of this  Agreement to  institute  any action or to recover any
damages that would be in conflict with or contrary to this acknowledgment or the
releases Employee has granted  hereunder.  Employee  understands and agrees that
the  Company's  payment of money and other  benefits to Employee and  Employee's
signing of this  Agreement  does not in any way indicate  that  Employee has any
viable  claims  against  the Company or that the  Company  admits any  liability
whatsoever.

         14. This Agreement  constitutes the entire agreement of the parties and
all prior negotiations or representations are merged herein. It shall be binding
upon and shall inure to the benefit of the parties  hereto and their  respective
successors,  assigns, heirs and legal representatives but neither this Agreement
nor any rights  hereunder shall be assignable by Employee  without the Company's
written consent. In addition,  this Agreement supersedes any prior employment or
compensation  agreement,  whether written,  oral or implied in law or implied in
fact between Employee and the Company, other than those contracts and agreements
excepted from the  application  of section 5.7 of the Plan pursuant to the terms
of such section, which prior agreements are hereby terminated.

         15.  If for  any  reason  any one or  more  of the  provisions  of this
Agreement shall be held or deemed to be inoperative, unenforceable or invalid by
a court of competent jurisdiction,  such circumstances shall not have the effect
of rendering  such  provision  invalid in any other case or rendering  any other
provisions of this Agreement inoperative, unenforceable or invalid.

         16. This  Agreement  shall be construed in accordance  with the laws of
the State of Connecticut,  except to the extent superseded by applicable federal
law.

         17.  This  Agreement  shall  terminate  in its  entirety  the Change in
Control Severance Agreement between the Company and Employee.

                  IN WITNESS WHEREOF, Employee and Cognizant Corporation, by its
duly authorized agent, have hereunder executed this Agreement.




                                 --------------------------------
                                    Employee


                                 COGNIZANT CORPORATION


                                 --------------------------------
                                     Title:





Appendix I

Summary of Benefit Entitlements
Under The Cognizant Corporation
Executive Transition Plan


Employment with                                  December 19, 1989
Company Since:

Effective Date of                                February 28, 1997
Inactive Status:

Effective Date                                   April 18, 1997
of Resignation:

Positions Resigned:                              See Appendix III

Retained Board Seats                             Gartner Group, Inc.
                                                 Aspect Development, Inc.
                                                 Oacis Healthcare Systems, Inc.
                                                 Paragren Technologies
                                                 TSI International

Effective Date of                                April 18, 1997
Eligible Termination:

Termination Date:                               February 28, 1999


Salary Continuation:                          $12,538.46 per week for 104 weeks

Welfare Benefit Continuation:                  Medical Plan (safety net)
                                               Dental Plan
                                               Life    Insurance
                                               (coverage      in
                                                effect    as   of
                                                effective date of
                                                inactive  status)
                                                Health       Care
                                                Spending Account

Annual Bonus Payment:    2/12 of the annual bonus  otherwise payable to you at
                         time of normal payment.

Executive Outplacement:     As provided by the Company.

Financial Planning/         As provided by the Company.
Counseling:

         The  description  of  benefits  contained  in this  Appendix  is only a
summary and is subject to the terms and  conditions  of the Plan.  Refer to your
summary plan description for more detail.






Appendix III

Directorships and Officerships

Corporation/Title

Cognizant Corporation
         Executive Vice President

Cognizant Enterprises Corporation
         Director
         President

Cognizant Enterprises, Inc.
         Director
         President

Dataquest (Korea), Inc.
         Director
         Chairman

Dun & Bradstreet HealthCare Information, Inc.
         Director

Dun & Bradstreet-Satyam Software Private Limited
         Director


LexHealth, Inc.
         Director

Pilot Software, Inc.
         Director
         Chairman