CORDIANT COMMUNICATIONS GROUP PLC /ADR
SC 13D, 1999-11-19
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

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

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934


                             HEALTHWORLD CORPORATION
                                (Name of Issuer)

                Shares of Common Stock, par value $0.01 per share
                         (Title of Class of Securities)


                                 (CUSIP Number)
Mr. Michael Bungey                                    with copies to:
Cordiant Communications Group plc                     Timothy B. Goodell, Esq.
121-141 Westbourne Terrace                            White & Case LLP
London  W26JRF                                        1155 Avenue of the
011-44-171-262-4343                                      Americas
                                                      New York, NY 10036
                                                      (212) 819-8259

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

                                November 9, 1999
         --------------------------------------------------------------
             (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  which is the subject of this  Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box. [_]



Note: Six copies of this statement, including all exhibits, should be filed with
the  Commission.  See Rule  13d-1(a) for other  parties to whom copies are to be
sent.

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

<PAGE>


                                  SCHEDULE 13D

- ---------------------------------
 CUSIP No.
- ---------------------------------

- -------- -----------------------------------------------------------------------
 1       NAME OF REPORTING PERSON
         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                                                 I.R.S. Identification No.:
         Cordiant Communications Group plc         Not Applicable
- -------- -----------------------------------------------------------------------
 2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP             (a)[X]
                                                                      (b)[ ]

- -------- -----------------------------------------------------------------------
 3       SEC USE ONLY

- -------- -----------------------------------------------------------------------
 4       SOURCE OF FUNDS

         N/A
- -------- -----------------------------------------------------------------------
 5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
         PURSUANT TO ITEMS 2(d) or 2(e)                                  [_]

- -------- -----------------------------------------------------------------------
 6       CITIZENSHIP OR PLACE OF ORGANIZATION

         England
- ----------------------------------- ------- ------------------------------------
NUMBER OF SHARES BENEFICIALLY        7      SOLE VOTING POWER
OWNED BY EACH REPORTING                     0
PERSON WITH                         ------- ------------------------------------
                                     8      SHARED VOTING POWER
                                            *
                                    ------- ------------------------------------
                                     9      SOLE DISPOSITIVE POWER
                                            0
                                    ------- ------------------------------------
                                     10     SHARED DISPOSITIVE POWER
                                            *
- -------- -----------------------------------------------------------------------
 11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         *
- -------- -----------------------------------------------------------------------
12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
         CERTAIN SHARES                                                  [_]

- -------- -----------------------------------------------------------------------
13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
         *
- -------- -----------------------------------------------------------------------
14       TYPE OF REPORTING PERSON
         CO
- -------- -----------------------------------------------------------------------


* CCG may be deemed to be the beneficial owner of the shares of the common stock
of the Company  reported  herein  through its  ownership of all the  outstanding
shares of common  stock of  Healthworld  Acquisition  Corp.  Such  shares of the
common  stock of the  Company  are not  included  above  so as to  avoid  double
counting.



<PAGE>


                                  SCHEDULE 13D

- ---------------------------------
 CUSIP No.
- ---------------------------------

- -------- -----------------------------------------------------------------------
 1       NAME OF REPORTING PERSON
         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

         Healthworld Acquisition Corp.
- -------- -----------------------------------------------------------------------
 2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP             (a)[X]
                                                                      (b)[ ]

- -------- -----------------------------------------------------------------------
 3       SEC USE ONLY


- -------- -----------------------------------------------------------------------
 4       SOURCE OF FUNDS

         N/A
- -------- -----------------------------------------------------------------------
 5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
         PURSUANT TO ITEMS 2(d) or 2(e)                                  [_]
- -------- -----------------------------------------------------------------------
 6       CITIZENSHIP OR PLACE OF ORGANIZATION

         Delaware
- ----------------------------------- ------- ------------------------------------
NUMBER OF SHARES BENEFICIALLY        7      SOLE VOTING POWER
OWNED BY EACH REPORTING                     0
PERSON WITH                         ------- ------------------------------------
                                     8      SHARED VOTING POWER
                                            5,093,977
                                    ------- ------------------------------------
                                     9      SOLE DISPOSITIVE POWER
                                            5,093,977
                                    ------- ------------------------------------
                                     10     SHARED DISPOSITIVE POWER
                                            0
- -------- -----------------------------------------------------------------------
 11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

         5,093,977
- -------- -----------------------------------------------------------------------
12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
         CERTAIN SHARES                                                   [_]

- -------- -----------------------------------------------------------------------
13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
         62.8%
- -------- -----------------------------------------------------------------------
14       TYPE OF REPORTING PERSON

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


<PAGE>



Item 1.  Security and Issuer.

                  This statement  relates to 5,093,977  shares (the "Shares") of
common stock,  par value $0.01 per share (the "Common  Stock"),  of  Healthworld
Corp.,  a  corporation  organized  under the laws of the State of Delaware  (the
"Company").  The principal  executive  offices of the Company are located at 100
Avenue of the Americas, New York, NY 10013.

Item 2.  Identity and Background.

                  (a)-(c),  (f)  This  statement  is  being  filed  by  Cordiant
Communications  Group plc ("CCG"),  a  corporation  organized  under the laws of
England and Wales, and Healthworld Acquisition Corp. ("Merger Sub" and, together
with CCG, the  "Reporting  Persons"),  a Delaware  corporation  and wholly owned
subsidiary of CCG.

                  CCG is a publicly  traded British  corporation,  the shares of
which are traded on the London Stock Exchange.

                  Merger Sub was formed solely to acquire all of the outstanding
capital stock of the Company.  The principal executive offices of Merger Sub are
located at c/o CCG.

                  The name,  citizenship,  business  address,  present principal
occupation or employment and five-year  employment history of each member of the
Board of  Directors  of CCG,  the  directors  of  Merger  Sub and the  executive
officers of CCG and Merger Sub are set forth on Schedule I hereto.

                  (d)-(e)  During the last five years,  none of CCG,  Merger Sub
or, to the best of their  knowledge,  any person  named on Schedule I hereto has
been convicted in a criminal proceeding (excluding traffic violations or similar
misdemeanors)  or has  been a  party  to a civil  proceeding  of a  judicial  or
administrative  body of competent  jurisdiction as a result of which such person
was or is  subject  to a  judgment,  decree  or  final  order  enjoining  future
violations  of, or prohibiting  or mandating  activities  subject to, federal or
state securities laws or finding any violation with respect to such laws.

Item 3.  Source and Amount of Funds or Other Consideration.

                  Not applicable.

Item 4.  Purpose of Transaction.

                  (a)-(j)  On  November  9,  1999,  each of CCG and  Merger  Sub
entered into an Agreement  and Plan of Merger dated as of such date (the "Merger
Agreement")  with the Company.  The Merger  Agreement is incorporated  herein by
reference and is filed as Exhibit 1 hereto.  The Merger Agreement provides that,
upon the terms and subject to the conditions  contained in the Merger Agreement,
Merger Sub will be merged  (the  "Merger")  with and into the  Company,  and the
Company, as the surviving  corporation in the Merger, will become a wholly owned
subsidiary of CCG. Upon the  consummation  of the Merger,  the Merger  Agreement
provides  that  (i) all of the  issued  and  outstanding  Common  Stock  will be
converted  into the right to  receive a certain  number of CCG  ordinary  shares
based  on an  exchange  ratio  to be  fixed  three  days  prior  to the  special
shareholder  meeting of  Healthworld  based on the average  trading price of CCG
ordinary  shares over ten trading  days and (ii) each  outstanding  share of the
common stock of Merger Sub will be converted  into one share of the common stock
of the  surviving  corporation.  Concurrently  with the  execution of the Merger
Agreement,  CCG and Merger Sub  entered  into a separate  Stockholder  Agreement
dated as of  November  9, 1999 (the  "Stockholder  Agreement')  with each of (1)
William Butler,  (2) Herbert  Ehrenthal,  (3) Spencer Falk, (4) Michael Garnham,
(5) Steven  Girgenti,  (6) Frances  Hughes,  (7) William Leslie Milton,  (8) the
Spencer Falk Grantor  Retained  Annuity Trust u/t/a/d March 5, 1999,  (9) Steven
Girgenti  Grantor  Retained  Annuity  Trust,  (10) The Girgenti  Family  Limited
Partnerships  and (11) The  Steve  Girgenti  Charitable  Lead  Annuity  Trust in
respect of the Shares.  The Stockholder  Agreements are  incorporated  herein by
reference and are filed as Exhibits 2 through 12, respectively hereto.  Pursuant
to the Stockholder Agreements,  the Stockholders have agreed that they will vote
the Shares (i) in favor of the approval and adoption of the Merger Agreement and
the approval of the Merger and the other transactions  contemplated  thereby and
(ii) against certain other transactions.

                  The  purpose  of the  Merger,  the  Merger  Agreement  and the
Stockholder  Agreements  is to  enable  CCG  to  acquire  control  of all of the
outstanding  capital stock of the Company.  Upon consummation of the Merger, the
Company will become a wholly owned subsidiary of CCG. Upon acquiring  control of
the Company,  CCG will  continue to evaluate the business and  operations of the
Company  and  will  effect  such  changes  as it  deems  appropriate  under  the
circumstances  and conditions then existing.  Such changes could include,  among
other things,  changes in the Company's corporate  structure,  capitalization or
dividend policy.

                  Except as otherwise  discussed herein,  neither CCG nor Merger
Sub nor, to the best of their knowledge,  any person set forth on Schedule I has
any plans or  proposals  which  would  relate  to or would  result in any of the
transactions  described in sub  paragraphs (a) through (j) of Item 4 of Schedule
13D.

Item 5.      Interest in Securities of the Issuer.

                  (a) CCG and  Merger Sub  beneficially  own  5,093,977  Shares,
constituting  approximately  62.8% of the Shares  issued and  outstanding  as of
November 9, 1999.

                  Except as set forth in this Item 5(a), none of CCG, Merger Sub
or, to the best of their  knowledge,  any of the  persons  named in  Schedule  I
hereto beneficially owns any Shares.

                  (b) CCG and Merger  Sub,  together,  share  voting  power with
respect to 5,093,977 Shares.

                  (c)  Except as set forth in Item 4, none of CCG and Merger Sub
or, to the best of their  knowledge,  any of the  persons  named in  Schedule  I
hereto, has effected any transaction in Shares during the past 60 days.

                  (d) Not applicable.

                  (e) Not applicable.

Item 6.      Contracts,  Arrangements,   Understandings  or  Relationships  with
             Respect to Securities of the Issuer.

                  Except as described below,  none of the Reporting  Persons or,
to the best of their  knowledge,  any of the persons set forth in Schedule I has
any contract,  arrangement,  understanding or relationship with any other person
with  respect to any security of any  Reporting  Person.  Concurrently  with the
execution  of the Merger  Agreement,  and as required by CCG and Merger Sub, the
Stockholders executed the Stockholder Agreements.

                  Merger Agreement.  The Merger Agreement  provides that, on the
terms and upon the satisfaction of the conditions  precedent  contained therein,
the  Company  will be merged  with and into Merger Sub and will be come a wholly
owned subsidiary of CCG. The Merger is conditioned upon, among the other things:
the  requisite  approval of holders  common stock of the Company;  the requisite
approval of the holders of ordinary  shares of CCG;  the  expiration  or earlier
termination of any waiting period (or any extension  thereof)  applicable to the
consummation of the Merger under the  Hart-Scott-Rodino  Antitrust  Improvements
Act of 1976, as amended.  On consummation  of the Merger,  (i) all of the issued
and outstanding  common stock of the Company will be converted into the right to
receive a certain  number of CCG American  Depositary  Receipts,  or if properly
elected,  CCG ordinary  shares based on an exchange ratio to be fixed three days
prior to the special  shareholder  meeting of  Healthworld  based on the average
trading  price of CCG  ordinary  shares  over  ten  trading  days and (ii)  each
outstanding  share of the common stock of Merger Sub will be converted  into one
share of the common stock of the surviving corporation.

                  Stockholder  Agreements.  The  following  is a summary  of the
material  terms of the  Stockholder  Agreements.  This summary is not a complete
description of the terms and conditions thereof and is qualified in its entirety
by  reference  to  the  full  text  of  the  Stockholder  Agreements  which  are
incorporated  herein by reference  and a copy of each of which has been filed as
Exhibit 2 hereto.

                  Stock   Option.   A  number  of  principal   stockholders   of
Healthworld  (the   "Stockholders")  have  each  entered  into  the  Stockholder
Agreement  pursuant to which they  granted to Merger Sub an  irrevocable  option
(the  "Option")  to purchase all of the Shares  owned by such  Stockholder  at a
purchase price per share based upon on the average trading price of CCG ordinary
shares over ten trading days ending on the date the Option is  exercised.  Until
the termination date of the Stockholder Agreements,  the Option may be exercised
by Merger Sub, in whole or in part, at any time, or from time to time, after the
occurrence of any of the following  events:  (i) Healthworld fails to obtain the
requisite  majority approval for the Merger;  (ii) the termination of the Merger
Agreement due to a breach by Healthworld,  or (iii) any Stockholder violates any
term of such Stockholder's Stockholder Agreement.

                  Voting.  Each  Stockholder has agreed that,  during the period
commencing on the date of such Stockholder's  Agreement and continuing until the
first to occur of the effective  time of the Merger or the  termination  date of
such Stockholder  Agreement,  at any meeting of the Company's stockholders or in
connection  with  any  written  consent  of  the  Company's  stockholders,  such
Stockholder  will  vote  (or  cause  to be  voted)  the  Shares  owned  by  such
Stockholder  (i)  in  favor  of  the  Merger,  the  execution  and  delivery  by
Healthworld  of the Merger  Agreement  and the approval of the terms thereof and
each  of the  other  actions  contemplated  by the  Merger  Agreement  and  such
Stockholder   Agreement  and  any  actions   required  in  furtherance  of  such
agreements;  (ii) against any action or agreement  that would result in a breach
in any material respect of any covenant, representation or warranty or any other
obligation  or agreement  of  Healthworld  under the Merger  Agreement or by the
Stockholder  under such  Stockholder  Agreement;  and (iii)  except as otherwise
agreed to in writing in advance by CCG,  against the  following  actions  (other
than the Merger and the transactions contemplated by the Merger Agreement):  (A)
any  extraordinary  corporate  transaction,  such as a merger,  consolidation or
other business  combination  involving  Healthworld or its  subsidiaries;  (B) a
sale,  lease or transfer of a material  amount of assets of  Healthworld  or its
subsidiaries, or a reorganization,  recapitalization, dissolution or liquidation
of the  Healthworld  or its  subsidiaries;  (C) any change in a majority  of the
persons who constitute the board of directors of Healthworld;  (D) any change in
the present  capitalization  of  Healthworld  or any amendment of  Healthworld's
Certificate  of  Incorporation  or  Bylaws;  (E) any  other  material  change in
Healthworld's corporate structure or business; or (F) any other action involving
Healthworld  or its  subsidiaries  which is  intended,  or could  reasonably  be
expected, to materially impede,  interfere with, delay,  postpone, or materially
adversely  affect  the  Merger  and  the   transactions   contemplated  by  such
Stockholder  Agreement and the Merger  Agreement.  Each  Stockholder has further
agreed  not to enter  into any  agreement  or  understanding  with any person or
entity the effect of which would be to violate  the  provisions  and  agreements
described above.

                  Representations,  Warranties,  Covenants and Other Agreements.
In each Stockholder Agreement, each Stockholder has made certain representations
and warranties to CCG and to Merger Sub, including with respect to (i) ownership
of the  Shares  owned  by  such  Stockholder  on  the  date  of the  Stockholder
Agreement;   (ii)  authority  to  enter  into  and  perform  such  Stockholder's
obligations  under the  Stockholder  Agreement;  (iii) the  ability  of the such
Stockholder to enter into the  Stockholder  Agreement  without  violating  other
agreements  to which  they  are a party;  and  (iv)  the  absence  of liens  and
encumbrances on and in respect of the Shares.  Each Stockholder has also entered
into certain  covenants,  including with respect to restrictions on the transfer
of the Shares.  Each  Stockholder has agreed that,  until the last day the Stock
Option is exercisable pursuant to the Stockholder  Agreement,  they will not, in
their capacity as a stockholder of the Company, directly or indirectly initiate,
solicit (including by way of furnishing information), encourage or respond to or
take any other action  knowingly to  facilitate,  any inquiries or the making of
any  proposal by any person or entity  (other than CCG or any  affiliate of CCG)
with respect to the Company that  constitute  or  reasonably  may be expected to
lead to a Takeover  Proposal (as defined under the Merger  Agreement),  or enter
into or maintain or continue  discussions or negotiate with any person or entity
in furtherance of such inquires or to obtain any Takeover Proposal,  or agree to
or endorse any  Takeover  Proposal,  or authorize or permit any person or entity
acting on behalf of the Stockholder to do any of the foregoing.

                  Under the Merger Agreement a "Takeover Proposal" is defined as
any proposed merger or other business combination,  sale or other disposition of
any material amount of assets,  sale of shares of capital stock, tender offer or
exchange  offer or  similar  transactions  involving  the  Company or any of its
subsidiaries

         Termination.  Each Stockholder Agreement shall terminate,  and no party
shall have any rights or  obligations  thereunder,  upon the  earlier of (1) the
termination of the Merger  Agreement;  and (2) the effective time of the Merger,
except that:

         (i) the voting  obligations of such  Stockholder  under clause (iii)(A)
and (B) set forth above under "Stockholder Agreements-Voting" shall terminate on
the earlier to occur of the Effective Time and 120 days after the termination of
the Merger Agreement (unless the Merger Agreement is terminated by reason of the
failure to obtain the  requisite  approval of the holders of ordinary  shares of
CCG in which case such  Stockholder's  obligations under under such clause shall
terminate simultaneously with the termination of the Merger Agreement); and

         (ii) the Option  shall  survive for a period of 20 days  following  the
termination of such  Stockholder  Agreement under the  circumstances  previously
described above under "Stockholder Agreements-Stock Option."

Item 7.      Material to Be Filed as Exhibits.

             The following exhibits are filed with this statement:

               1.   Agreement and Plan of Merger dated  November 9, 1999, by and
                    among  Cordiant   Communications   Group  plc,   Healthworld
                    Acquisition Corp. and Healthworld Corporation.

               2.   Stockholder Agreement,  dated as of November 9, 1999, by and
                    among  Cordiant   Communications   Group  plc,   Healthworld
                    Acquisition Corp. and William Butler.

               3.   Stockholder Agreement,  dated as of November 9, 1999, by and
                    among  Cordiant   Communications   Group  plc,   Healthworld
                    Acquisition Corp. and Herbert Erenthal.

               4.   Stockholder Agreement,  dated as of November 9, 1999, by and
                    among  Cordiant   Communications   Group  plc,   Healthworld
                    Acquisition Corp. and Spencer Falk.

               5.   Stockholder Agreement,  dated as of November 9, 1999, by and
                    among  Cordiant   Communications   Group  plc,   Healthworld
                    Acquisition Corp. and Michael Garnham.

               6.   Stockholder Agreement,  dated as of November 9, 1999, by and
                    among  Cordiant   Communications   Group  plc,   Healthworld
                    Acquisition Corp. and Steven Girgenti.

               7.   Stockholder Agreement,  dated as of November 9, 1999, by and
                    among  Cordiant   Communications   Group  plc,   Healthworld
                    Acquisition Corp. and Frances Hughes.

               8.   Stockholder Agreement,  dated as of November 9, 1999, by and
                    among  Cordiant   Communications   Group  plc,   Healthworld
                    Acquisition Corp. and William Leslie Milton.

               9.   Stockholder Agreement,  dated as of November 9, 1999, by and
                    among  Cordiant   Communications   Group  plc,   Healthworld
                    Acquisition  Corp.  and the Spencer  Falk  Grantor  Retained
                    Annuity Trust u/t/a/d March 5, 1999.

               10.  Stockholder Agreement,  dated as of November 9, 1999, by and
                    among  Cordiant   Communications   Group  plc,   Healthworld
                    Acquisition  Corp.  and  Steven  Girgenti  Grantor  Retained
                    Annuity Trust.

               11.  Stockholder Agreement,  dated as of November 9, 1999, by and
                    among  Cordiant   Communications   Group  plc,   Healthworld
                    Acquisition   Corp.   and  The   Girgenti   Family   Limited
                    Partnerships.

               12.  Stockholder Agreement,  dated as of November 9, 1999, by and
                    among  Cordiant   Communications   Group  plc,   Healthworld
                    Acquisition  Corp.  and The Steve Girgenti  Charitable  Lead
                    Annuity Trust.




<PAGE>


                                    SIGNATURE



          Each Reporting Person certifies that, after reasonable  inquiry and to
the  best of its  knowledge  and  belief,  the  information  set  forth  in this
statement is true, complete and correct.

Dated:  November 19, 1999                  CORDIANT COMMUNICATIONS GROUP PLC



                                           By /s/ Arthur D'Angelo
                                              -------------------------------
                                              Name:  Arthur D'Angelo
                                              Title: Finance Director


Dated:  November 19, 1999                  HEALTHWORLD ACQUISITION CORP.



                                           By: /s/ Arthur D'Angelo
                                              -------------------------------
                                              Name:  Arthur D'Angelo
                                              Title: President




<PAGE>



                                  Exhibit Index



     1.   Agreement  and Plan of Merger  dated  November  9, 1999,  by and among
          Cordiant  Communications Group plc, Healthworld  Acquisition Corp. and
          Healthworld Corporation.

     2.   Stockholder  Agreement,  dated as of  November  9, 1999,  by and among
          Cordiant  Communications Group plc, Healthworld  Acquisition Corp. and
          William Butler.

     3.   Stockholder  Agreement,  dated as of  November  9, 1999,  by and among
          Cordiant  Communications Group plc, Healthworld  Acquisition Corp. and
          Herbert Erenthal.

     4.   Stockholder  Agreement,  dated as of  November  9, 1999,  by and among
          Cordiant  Communications Group plc, Healthworld  Acquisition Corp. and
          Spencer Falk.

     5.   Stockholder  Agreement,  dated as of  November  9, 1999,  by and among
          Cordiant  Communications Group plc, Healthworld  Acquisition Corp. and
          Michael Garnham.

     6.   Stockholder  Agreement,  dated as of  November  9, 1999,  by and among
          Cordiant  Communications Group plc, Healthworld  Acquisition Corp. and
          Steven Girgenti.

     7.   Stockholder  Agreement,  dated as of  November  9, 1999,  by and among
          Cordiant  Communications Group plc, Healthworld  Acquisition Corp. and
          Frances Hughes.

     8.   Stockholder  Agreement,  dated as of  November  9, 1999,  by and among
          Cordiant  Communications Group plc, Healthworld  Acquisition Corp. and
          William Leslie Milton.

     9.   Stockholder  Agreement,  dated as of  November  9, 1999,  by and among
          Cordiant  Communications Group plc, Healthworld  Acquisition Corp. and
          the Spencer Falk Grantor Retained Annuity Trust u/t/a/d March 5, 1999.

     10.  Stockholder  Agreement,  dated as of  November  9, 1999,  by and among
          Cordiant  Communications Group plc, Healthworld  Acquisition Corp. and
          Steven Girgenti Grantor Retained Annuity Trust.

     11.  Stockholder  Agreement,  dated as of  November  9, 1999,  by and among
          Cordiant  Communications Group plc, Healthworld  Acquisition Corp. and
          The Girgenti Family Limited Partnerships.

     12.  Stockholder  Agreement,  dated as of  November  9, 1999,  by and among
          Cordiant  Communications Group plc, Healthworld  Acquisition Corp. and
          The Steve Girgenti Charitable Lead Annuity Trust.




<PAGE>


                                                                     Schedule I

                        DIRECTORS AND EXECUTIVE OFFICERS

CCG

          Unless  otherwise  indicated,  the principal  business address of each
person set forth below is c/o CCG Group plc, 121-141 Westbourne Terrace,  London
W26JR.

          The Directors and Executive Officers of Cordiant  Communications Group
plc are as follows:

<TABLE>
<CAPTION>

Name                   Position:  Principal Occupation and Background      Nationality  Age
- ----                   ----------------------------------------------      -----------  ---
<S>                    <C>                                                 <C>          <C>

Michael Bungey         Director and Chief  Executive  Officer of CCG       British      59
                       and  Chairman  and Chief  Executive  Officer,
                       Bates  Worldwide.  In  1971,  Michael  Bungey
                       set up  his  own  agency,  Michael  Bungey  &
                       Partners.   This  was  merged  with   Dorland
                       Advertising   in  1984.  In  1988  he  became
                       Chairman  and  Chief  Executive   Officer  of
                       Bates  Dorland  and  Bates  Europe.   He  was
                       appointed   President  and  Chief   Operating
                       Officer  of Bates  Worldwide  in 1993,  Chief
                       Executive  Officer in April 1994 and Chairman
                       in  December  1994.  He  joined  the Board of
                       CCG in January 1995.

Arthur D'Angelo        Finance  Director  of  CCG.  Arthur  D'Angelo       American     47
                       joined  Saatchi  &  Saatchi  Holdings  USA in
                       October   1987  as  Tax   Director   and  was
                       subsequently  appointed  President  and Chief
                       Executive   Officer   of  Saatchi  &  Saatchi
                       Holdings   USA.   He  joined   Bates  USA  as
                       Executive Vice President and Chief  Financial
                       Officer  in April  1994 and  later  that year
                       was named  Chief  Financial  Officer of Bates
                       North  America.  In July  1995  he was  named
                       Chief Financial Officer of Bates Worldwide.

Jean de Yturbe         Director,  Chairman,  Bates  Europe.  Jean de        French      52
                       Yturbe was  President of HDM Europe from 1985
                       to  1990  and  Chief  Executive   Officer  of
                       Eurocom  Advertising  Worldwide  from 1990 to
                       1992.  He joined  Bates in July 1993 as Chief
                       Executive  Officer  of Bates  France  and was
                       named  Chairman  of Bates  Europe in  January
                       1995.

Alex Hamill            Director,   Chief  Executive  Officer,  Bates      Australian    56
                       Asia  Pacific.  Alex  Hamill  joined  the Ted
                       Bates   group  in   1968.   In  1978  he  was
                       appointed    General    Manager   of   George
                       Patterson  in  Australia.   In  1984  he  was
                       appointed   Managing   Director   of   George
                       Patterson's   Sydney   office   and  in  1987
                       Managing   Director   of   George   Patterson
                       Australia.   In   1991   he   was   appointed
                       Chairman  and  Chief  Executive   Officer  of
                       George Patterson Bates and Regional  Director
                       for Bates Worldwide in Asia-Pacific.

Peter M Schoning       Director,   Chairman   and  Chief   Executive        German      53
                       Officer,  Scholz & Friends.  Prior to joining
                       Scholz & Friends,  Peter M Schoning worked in
                       a variety of advertising  agencies in Munich,
                       Paris and Hamburg,  where he, most  recently,
                       was a member of the Lintas  management  team.
                       He  joined   Scholz  &  Friends  in  1984  as
                       Managing  Director  and  was  named  Managing
                       Partner  in  1987.  In 1993 he was  appointed
                       Chief  Executive  Officer  at the  agency and
                       since 1995 he has led the agency as  Chairman
                       and Chief Executive Officer.

William Whitehead      Director,   Chief  Executive  Officer,  Bates       Canadian     53
                       North  America.  Prior  to  joining  the  Ted
                       Bates group in 1971,  Bill  Whitehead  worked
                       for  Foster  Advertising.  In 1983 he  joined
                       Bates  Canada and in 11 years with the agency
                       held  a  number  of  senior  positions,  most
                       recently  as  Chairman  and  Chief  Executive
                       Officer.  In May 1994 he was named  Executive
                       Director  of  Worldwide  Client  Services  at
                       Bates   Worldwide   and  at  the  same   time
                       Regional  Director of Latin America for Bates
                       Worldwide.   In   December   1994,   he   was
                       appointed Chief  Operating  Officer for Bates
                       North  America.  In September  1995 he became
                       President  and  Chief  Operating  Officer  of
                       Bates  USA.  In  July  1996 he  became  Chief
                       Executive Officer of Bates North America.

Charles Scott          Chairman  of CCG.  Charles  Scott  worked for       British      50
                       Itel    Corporation    before   joining   IMS
                       International,  Inc.  in  1977  where  he was
                       Chief  Financial   Officer  from  1986  until
                       joining  CCG as Finance  Director  in January
                       1990.  He was  promoted  to  Chief  Operating
                       Officer   of  CCG  in  July  1991  and  Chief
                       Executive  Officer in April 1993.  In January
                       1995,  he  was  appointed   Chief   Executive
                       Officer  and  Acting  Chairman.  In July 1995
                       he was  appointed  executive  Chairman and in
                       December   1997   he   became   non-executive
                       Chairman.    He   was   also    non-executive
                       Chairman  of  Saatchi  &  Saatchi  plc  until
                       January  1,  1999.  He  is  a   non-executive
                       director  of  adidas-Salomon  AG and of Joe's
                       Developments  Limited.  In  addition,  he has
                       been a director of Emcore  Corporation  since
                       February 1998 and of TBI plc since May 1998.

Dudley Fishburn        Non-executive  Director.  Dudley Fishburn has       British      53
                       been   a    Member    of    Parliament    and
                       Parliamentary   Private   Secretary   at  the
                       Foreign  Office  and  at  the  Department  of
                       Trade and  Industry.  He is Associate  Editor
                       of The  Economist,  Treasurer of the National
                       Trust,  Chairman of the  Trustees of the Open
                       University,  Chairman  of HFC  Bank plc and a
                       Trustee of the Prison  Reform  Trust,  all of
                       which   are   based  in  the  UK.   He  is  a
                       non-executive     director    of    Household
                       International,   Inc.,   Euclidian   plc  and
                       Philip Morris.

Professor Theodore     Non-executive  Director.  Theodore  Levitt is       American     74
Levitt                 Edward  W.  Carter   Professor   of  Business
                       Administration,   Emeritus,  of  the  Harvard
                       University  Business School and serves on the
                       board of Sandford C.  Bernstein  Funds,  Inc.
                       in the US. He is also the author of  numerous
                       articles and books on  economics,  management
                       and marketing and was formerly  Editor of the
                       Harvard Business Review.

James Tyrrell          Non-executive Director.  James Tyrrell joined       British      58
                       the Board in May 1998.  He was Group  Finance
                       Director  of London  International  Group plc
                       until   November   1997   and  an   executive
                       director    there    until    August    1998.
                       Previously he was Group  Finance  Director of
                       Abbey  National Plc and Managing  Director of
                       HMV  Shops   Limited.   He  is   Chairman  of
                       Ferguson     International    PLC    and    a
                       non-executive director of Point Group Ltd.

Dr. Rolf Stomberg      Non-executive     Director.     Rolf Stomberg       German       59
                       joined  the Board in May  1998.  From 1970 to
                       1997,  when he retired  from the Main  Board,
                       he worked for The British  Petroleum  Company
                       plc where he was Chief Executive  Officer for
                       B.P.  Oil  International  and  a  B.P.  Group
                       Managing  Director.  He serves on a number of
                       UK and  continental  boards and is a Visiting
                       Professor  at  Imperial  College   Management
                       School,  London  and the  Business  School of
                       Institut Francais du Petrole in Paris.

Stuart Howard          Deputy   Finance   Director,   Treasurer  and       British      37
                       Company  Secretary.  Stuart Howard joined CCG
                       on  May  1,   1998  from  WPP  where  he  was
                       International  Treasurer.  From  1992  he was
                       Group  Finance  Director for  Metrovideo  and
                       from 1990 to 1992 Deputy Finance  Director at
                       McColls.  Prior to that,  he spent  two years
                       as Regional  Controller at WPP and four years
                       with  KPMG   London.   In  1998,   he  became
                       Company Secretary of CCG.

David F. Ham           Group  Controller.  David F. Ham  joined  CCG       British      33
                       in May 1996 as  Manager  of Group  Reporting.
                       Prior  to that  he was  Group  Accountant  at
                       Alfred  McAlpine  plc from 1994 and spent six
                       years at Coopers & Lybrand.  In 1997,  he was
                       appointed Group Controller of CCG.

Stanley Bendelac       Chief  Operating  Officer,  Bates  Europe and       Dutch        57
                       Chairman,   Bates  Latin  America.  In  1971,
                       Stanley  Bendelac  founded  Delvico Bates, an
                       operating  unit  within  CCG.  In addition to
                       his   responsibilities   on   the   Executive
                       Committee,   he  is  currently  Chairman  and
                       Chief Executive  Officer of Grupo Bates S.A.,
                       Spain.

Les Stern              Worldwide    Planning     Director,     Bates       British      51
                       Worldwide.  Les Stern was a graduate  trainee
                       at Procter & Gamble  before  embarking  on an
                       advertising  career that  included  spells at
                       FCB,  Saatchi & Saatchi  and WCRS.  He joined
                       Bates  Dorland in 1990 as Executive  Planning
                       Director.  Following  secondment to Bates New
                       York he was made Worldwide  Planning Director
                       in 1994.  Les  Stern is also a member  of the
                       Executive Committee.

John Fawcett           Worldwide  Creative  Director.  John  Fawcett      Australian    49
                       began  his  advertising  career  with  George
                       Patterson  Bates,  and has  worked in various
                       roles  around the world for Leo  Burnett  and
                       J.  Walter   Thompson.   He  rejoined  George
                       Patterson  Bates as a creative group head and
                       became the company's first National  Creative
                       Director in March 1989.  He was  appointed as
                       its Managing Director  Australia in June 1992
                       and Chief  Executive  Officer  in July  1996.
                       He is also  currently  Chairman  of the Bates
                       Worldwide Creative Board.

Ian Smith              President,   International,  Bates  Worldwide       Australian   43
                       and  Executive  Committee  member.  He joined
                       the  George  Patterson  Bates  agency in 1989
                       and  was  named   General   Manager  and  New
                       Business  Director in 1990.  In 1996,  he was
                       appointed   Managing   Director   of   George
                       Patterson Bates Australia.

Colin Hearn            Chairman  and Chief  Executive  Officer,  141       British      48
                       Worldwide.   Colin  Hearn  joined  the  Bates
                       network  in 1985  from  Ogilvy &  Mather.  In
                       addition  to his  duties in  respect  of 141,
                       he is  responsible  for two of Bates' largest
                       global  clients,  BAT and Allied  Domecq.  He
                       was  appointed to the Bates  Worldwide  Board
                       in  1994  and   elected   to  the   Executive
                       Committee in 1998.

</TABLE>

Healthworld Acquisition Corp.

Unless otherwise  indicated,  the principal  business address of each person set
forth below is c/o CCG Group plc,  121-141  Westbourne  Terrace,  London  W26JR.
Healthworld  Acquisition Corp. was formed in November 1999 solely to acquire all
of the outstanding  capital stock of the Company.  Each of the following persons
has  occupied  the  positions  with  Healthworld   Acquisition  Corp.  from  its
inception.

          The Directors and Executive Officers of Healthworld  Acquisition Corp.
are as follows:

<TABLE>
<CAPTION>

Name                   Position:  Principal Occupation and Background      Nationality  Age

<S>                    <C>                                                 <C>          <C>


Arthur D'Angelo*       Director   and   President   of   Healthworld       American     47
                       Acquisition Corp.

Michael Bungey*        Director  and  Executive  Vice  President  of       British      59
                       Healthworld Acquisition Corp.

</TABLE>



                                                                       EXHIBIT 1



                          AGREEMENT AND PLAN OF MERGER



                                      AMONG



                        CORDIANT COMMUNICATIONS GROUP PLC



                          HEALTHWORLD ACQUISITION CORP.



                                       AND



                             HEALTHWORLD CORPORATION



                          Dated as of November 9, 1999








<PAGE>
                                TABLE OF CONTENTS


                                                                            Page

ARTICLE I  DEFINITIONS.......................................................2

      Section 1.1  Definitions...............................................2

ARTICLE II  THE MERGER.......................................................7

      Section 2.1  The Merger................................................7
      Section 2.2  Effective Time............................................7
      Section 2.3  Effects of the Merger.....................................7
      Section 2.4  Exchange Ratio............................................7
      Section 2.5  Conversion and Exchange of Shares.........................8
      Section 2.6  Procedure for Election....................................9
      Section 2.7  Exchange of Certificates..................................9
      Section 2.8  Withholding Rights.......................................13
      Section 2.9  Company Stock Options; Other Stock-Based Plans...........13
      Section 2.10  The Surviving Corporation...............................15

ARTICLE III  THE CLOSING....................................................15

      Section 3.1  Closing..................................................15

ARTICLE IV  REPRESENTATIONS AND WARRANTIES OF THE COMPANY...................16

      Section 4.1  Organization, Standing and Power.........................16
      Section 4.2  Capital Structure........................................16
      Section 4.3  Authority Relative to this Agreement.....................17
      Section 4.4  Non-Contravention; Approvals and Consents................18
      Section 4.5  SecReports and Financial Statements......................19
      Section 4.6  Information Supplied.....................................20
      Section 4.7  Absence of Certain Events................................20
      Section 4.8  Litigation...............................................21
      Section 4.9  Compliance with Applicable Law...........................21
      Section 4.10  Employee Plans..........................................22
      Section 4.11  Employment Relations and Agreement......................25
      Section 4.12  Contracts...............................................26
      Section 4.13  Taxes...................................................26
      Section 4.14  Intellectual Property...................................28
      Section 4.15  Environmental Laws and Regulations......................29
      Section 4.16  Voting Requirements.....................................29
      Section 4.17  Ownership of Parent Stock...............................29
      Section 4.18  State Takeover Statutes; Certain Charter Provisions.....29
      Section 4.19  Year 2000...............................................29
      Section 4.20  Brokers.................................................30

ARTICLE V  REPRESENTATIONS AND WARRANTIES OF PARENT AND MERGER SUB..........30

      Section 5.1  Organization and Qualification...........................30
      Section 5.2  Capital Stock............................................30
      Section 5.3  Authority Relative to this Agreement.....................31
      Section 5.4  Non-Contravention; Approvals and Consents................32
      Section 5.5  SEC Reports and Financial Statements.....................33
      Section 5.6  Absence of Certain Changes or Events.....................33
      Section 5.7  Absence of Undisclosed Liabilities.......................34
      Section 5.8  Legal Proceedings........................................34
      Section 5.9  Information Supplied.....................................34
      Section 5.10  Permits; Compliance with Laws and Orders................35
      Section 5.11  Compliance with Agreements..............................35
      Section 5.12  Vote Required...........................................36
      Section 5.13  Contracts...............................................36
      Section 5.14  Taxes...................................................36
      Section 5.15  Year 2000...............................................36
      Section 5.16  Ownership of Company Common Stock.......................37
      Section 5.17  Business of Merger Sub..................................37
      Section 5.18  Brokers.................................................37

ARTICLE VI  COVENANTS RELATING TO CONDUCT OF BUSINESS.......................37

      Section 6.1  Conduct of Business by the Company Pending the Merger....37
      Section 6.2  No Solicitation..........................................40
      Section 6.3  Third Party Standstill Agreements........................41

ARTICLE VII  ADDITIONAL AGREEMENTS..........................................41

      Section 7.1  Access to Information....................................41
      Section 7.2  Preparation of Registration Statement and Proxy
                Statement...................................................41
      Section 7.3  Approval Of Shareholders.................................42
      Section 7.4  Company Affiliates.......................................43
      Section 7.5  Auditors'Letters.........................................43
      Section 7.6  Stock Exchange Listing...................................43
      Section 7.7  Fees and Expenses........................................43
      Section 7.8  Commercially Reasonable Efforts..........................44
      Section 7.9  Public Announcements.....................................44
      Section 7.10  Indemnification; Directors and Officers Insurance.......44
      Section 7.11  Compliance with Treasury Regulations....................45
      Section 7.12  No Transfer of Stock....................................45
      Section 7.13  Dividends, Distributions and Issuance's.................45
      Section 7.14  Section 103 CA 1985.....................................46

ARTICLE VIII  CONDITIONS PRECEDENT..........................................46

      Section 8.1  Conditions to Each Party's Obligation to Effect the
                Merger......................................................46
      Section 8.2  Conditions to Obligation of  Parent And Merger Sub to
                Effect the Merger...........................................48
      Section 8.3  Conditions to Obligation of the Company to Effect the
                Merger......................................................48

ARTICLE IX  TERMINATION, AMENDMENT AND WAIVER...............................50

      Section 9.1  Termination..............................................50
      Section 9.2  Effect of Termination....................................51
      Section 9.3  Amendment................................................51
      Section 9.4  Waiver...................................................51

ARTICLE X  GENERAL PROVISIONS...............................................51

      Section 10.1  Non-Survival of Representations and Warranties..........51
      Section 10.2  Notices.................................................51
      Section 10.3  Interpretation..........................................53
      Section 10.4  Counterparts............................................53
      Section 10.5  Entire Agreement; No Third-Party Beneficiaries..........53
      Section 10.6  Governing Law...........................................53
      Section 10.7  Assignment..............................................53
      Section 10.8  Severability............................................53
      Section 10.9  Enforcement of this Agreement...........................54
      Section 10.10  Incorporation of Exhibits..............................54


<PAGE>


                          AGREEMENT AND PLAN OF MERGER


          AGREEMENT  AND PLAN OF  MERGER,  dated as of  November  9, 1999  (this
"Agreement"), among Cordiant Communications Group plc, a company organized under
the laws of England  and Wales  ("Parent"),  Healthworld  Acquisition  Corp.,  a
Delaware corporation and a wholly owned subsidiary of Parent ("Merger Sub"), and
Healthworld Corporation,  a Delaware corporation (the "Company") (Merger Sub and
the Company  being  hereinafter  collectively  referred  to as the  "Constituent
Corporations").



                              W I T N E S S E T H:


          WHEREAS,  Parent, Merger Sub and the Company intend to effect a merger
of Merger Sub with and into the Company in accordance with this  Agreement,  the
Delaware  General  Corporation Law (the "DGCL") and such other state laws as may
be applicable (the "Merger").  Upon consummation of the Merger,  Merger Sub will
cease to exist, and the Company will become a wholly owned subsidiary of Parent;

          WHEREAS,  the respective  boards of directors of Parent and Merger Sub
have approved this  Agreement and the Merger,  upon the terms and subject to the
conditions  set forth herein and  unanimously  recommend  that its  shareholders
approve the transactions contemplated by this Agreement;

          Whereas,  the  Board  of  Directors  of the  Company  has  unanimously
approved  this  Agreement  and the  Merger,  upon the terms and  subject  to the
conditions set forth herein, has determined that it is advisable and in the best
interests of its stockholders,  and unanimously recommends that its stockholders
approve the Merger;

          WHEREAS,  it  is  intended  that  the  Merger  qualify  as a  tax-free
reorganization within the meaning of Section 368(a) of the Internal Revenue Code
of 1986, as amended, and the rules and regulations thereunder (the "Code"); and

          WHEREAS,  to induce Parent and Merger Sub to enter into this Agreement
and to  consummate  the  Merger,  simultaneously  with  the  execution  of  this
Agreement,   certain  stockholders  of  the  Company  owning  in  the  aggregate
approximately 63% of the outstanding  shares of Company Common Stock (as defined
herein) on a fully diluted basis,  are entering into  agreements with Parent and
Merger Sub (the  "Stockholder  Agreements")  pursuant to which they have agreed,
among other  things,  to vote the shares of Company  Common  Stock owned by such
stockholder  in favor of the  adoption and  approval of this  Agreement  and the
approval of the Merger.

          NOW,   THEREFORE,   in   consideration   of  the   premises   and  the
representations,  warranties and agreements herein contained,  the parties agree
as follows:


                                    ARTICLE I

                                   DEFINITIONS

          Section  1.1 Definitions.  For all purposes of this Agreement,  except
as otherwise  expressly provided or unless the context otherwise  requires,  the
terms  defined  in this  Article  have  the  meanings  assigned  to them in this
Article:

          "ADS Consideration" has the meaning set forth in Section 2.5(c).

          "Affiliate" has the meaning set forth in Section 7.4.

          "Affiliate Agreement" has the meaning set forth in Section 7.4.

          "Agreement" has the meaning set forth in the preamble hereto.

          "business day" means a day other than a Saturday, a Sunday or a day on
which banks in New York,  New York or London,  England are permitted or required
by law to close.

          "Certificate" has the meaning set forth in Section 2.5(c).

          "Certificate of Merger" has the meaning set forth in Section 2.2.

          "Circular" has the meaning set forth in Section 4.6(b).

          "Closing" has the meaning set forth in Section 3.1.

          "Closing Date" has the meaning set forth in Section 3.1.

          "COC" has the meaning set forth in Section 8.1(h)(i).

          "Code" has the meaning set forth in the fourth WHEREAS clause hereto.

          "Companies Act" has the meaning set forth in Section 5.2(a).

          "Company" has the meaning set forth in the preamble hereto.

          "Company Affiliates" has the meaning set forth in Section 7.4.

          "Company  Common  Stock"  means the common  stock,  par value $.01 per
share, of the Company.

          "Company Disclosure Letter" has the meaning set forth in Section 4.1.

          "Company  Financial  Statements"  has the meaning set forth in Section
4.5(a).

          "Company  Material  Adverse  Effect"  means any  condition,  change or
effect  that is  materially  adverse  to the  business,  operations,  results of
operations,  condition  (financial or otherwise) or prospects of the Company and
its Subsidiaries taken as a whole.

          "Company Permits" has the meaning set forth in Section 4.9.

          "Company SEC Reports" has the meaning set forth in Section 4.5(a).

          "Company Stock Plan" has the meaning set forth in Section 4.2(a).

          "Company   Stock   Rights"  has  the  meaning  set  forth  in  Section
2.9(a)(ii).

          "Company Stockholders'  Approval" has the meaning set forth in Section
7.3(b).

          "Company  Stockholders'  Meeting" has the meaning set forth in Section
7.3(b).

          "Constituent  Corporations"  has the meaning set forth in the preamble
hereto.

          "Contracts" has the meaning set forth in Section 4.4(a).

          "Deposit  Agreement" means the Deposit  Agreement dated as of November
15, 1983, as amended and restated as of April 1, 1991, as amended as of July 16,
1991,  and as further  amended as of December  10,  1997,  between  Parent,  the
Depositary, and the holders from time to time of Parent ADRs.

          "Depositary" means The Bank of New York.

          "DGCL" has the meaning set forth in the first WHEREAS clause hereto.

          "Effective Time" has the meaning set forth in Section 2.2.

          "Election Date" has the meaning set forth in Section 2.6(a).

          "Employee Benefit Plans" has the meaning set forth in Section 4.10(a).

          "Environmental Law" has the meaning set forth in Section 4.15(a).

          "ERISA" has the meaning set forth in Section 4.10(a).

          "Exchange  Act" means the U.S.  Securities  Exchange  Act of 1934,  as
amended, and the rules and regulations thereunder.

          "Exchange Agent" has the meaning set forth in Section 2.7(a).

          "Exchange Fund" has the meaning set forth in Section 2.7(a).

          "Exchange  Rate" means the average  currency  exchange  rate of pounds
sterling  to US dollars  based upon the noon buying rate in the City of New York
for cable  transfers in foreign  currencies as announced by the Federal  Reserve
Bank of New York for  customs  purposes  over the 10  consecutive  Trading  Days
ending (i) with  respect to the Parent  Share  Value,  on the third  Trading Day
immediately prior to the Company  Stockholders' Meeting and (ii) with respect to
the  calculation  of the amount to be paid in respect of the  fractional  Parent
Ordinary Shares pursuant to Section  2.7(e),  immediately  preceding the Closing
Date.

          "Exchange Ratio" has the meaning set forth in Section 2.4.

          "Final Orders" has the meaning set forth in Section 8.1(g).

          "Form F-4" has the meaning set forth in Section 5.9(a).

          "FSA" has the meaning set forth in Section 4.6(b).

          "FTA" has the meaning set forth in Section 8.1(h)(i).

          "Governmental  or Regulatory  Authority"  has the meaning set forth in
Section 4.4(a).

          "Holders"  means the  holders  of record of  certificates  of  Company
Common Stock as of the Effective Time.

          "HSR Act" has the meaning set forth in Section 4.4(b).

          "Intellectual Property" has the meaning set forth in Section 4.14(a).

          "Issuance Obligation" has the meaning set forth in Section 4.2(a).

          "Laws" has the meaning set forth in Section 4.4(a).

          "License" has the meaning set forth in Section 4.14(a).

          "Lien" has the meaning set forth in Section 5.2(b).

          "Listing Particulars" has the meaning set forth in Section 4.6(b).

          "LSE" means London Stock Exchange Limited.

          "Material Employment  Agreements" has the meaning set forth in Section
4.11(b).

          "Material  Subsidiaries" means Bates U.K. Limited,  The Communications
Group Pty Ltd, Bates Gruppen A/S (Denmark),  Sholz & Friends GmbH, Bates Gruppen
AS (Norway), Bates Advertising Holding SA and Bates Advertising USA, Inc.

          "Merger" has the meaning set forth in the first WHEREAS clause hereto.

          "Merger Consideration" has the meaning set forth in Section 2.5(c).

          "Merger Sub" has the meaning set forth in the preamble hereto.

          "NYSE" means the New York Stock Exchange, Inc.

          "OFT" has the meaning set forth in Section 8.1(h)(i).

          "Orders" shall have the meaning set forth in Section 4.4(a).

          "Ordinary  Share  Consideration"  has the meaning set forth in Section
2.5(c).

          "Ordinary Share Election" has the meaning set forth in Section 2.6(a).

          "Ordinary  Share  Election  Form" has the meaning set forth in Section
2.6(a).

          "Parent" has the meaning set forth in the preamble hereto.

          "Parent ADRs" has the meaning set forth in Section 2.5(c).

          "Parent ADSs" has the meaning set forth in Section 2.5(c).

          "Parent  Disclosure  Documents"  has the  meaning set forth in Section
4.6(b).

          "Parent  Disclosure  Letter"  has the  meaning  set  forth in  Section
5.2(c).

          "Parent Material Adverse Effect" means any condition, change or effect
that is materially adverse to the business,  operations,  results of operations,
condition  (financial or otherwise) or prospects of Parent and its  Subsidiaries
taken as a whole.

          "Parent  Ordinary  Shares"  means  validly  issued,   fully  paid  and
nonassessable ordinary shares, with a nominal value of U.K. fifty pence each, of
Parent.

          "Parent Permits" has the meaning set forth in Section 5.10.

          "Parent SEC Reports" has the meaning set forth in Section 5.5.

          "Parent Share Right" has the meaning set forth in Section 2.9(a)(ii).

          "Parent  Share  Value"  means the  product  of (x) the  average of the
closing  middle  market  quotation  of a  Parent  Ordinary  Share  on the LSE as
reported in the Daily Official List of the London Stock Exchange for each of the
10  consecutive  Trading  Days  ending  on the  third  Trading  Day  immediately
preceding the date of the Company  Stockholders'  Meeting  multiplied by (y) the
Exchange Rate.

          "Parent  Shareholders'  Approval" has the meaning set forth in Section
7.3(a).

          "Parent  Shareholders'  Meeting"  has the meaning set forth in Section
7.3(a).

          "Parent Shares" has the meaning set forth in Section 2.5(c).

          "Pre-Effective Periods" has the meaning set forth in Section 4.13(a).

          "Preferred Stock" has the meaning set forth in Section 4.2(a).

          "Proxy Statement" has the meaning set forth in Section 4.6(a).

          "Registration Statement" has the meaning set forth in Section 5.9(a).

          "SEC" means the Securities and Exchange Commission.

          "Securities  Act" means the U.S.  Securities  Act of 1933, as amended,
and the rules and regulations thereunder.

          "Software" has the meaning set forth in Section 4.19.

          "SOS" has the meaning set forth in Section 8.1(h)(i).

          "Stock Option" has the meaning set forth in Section 8.1(h)(i).

          "Stockholder  Agreements"  has the  meaning  set  forth  in the  fifth
WHEREAS clause.

          "Subsidiary"  of any  person  means (i) any  corporation  of which the
outstanding capital stock having at least a majority of the votes entitled to be
cast in the election of directors under ordinary circumstances shall at the time
be owned,  directly or  indirectly,  by such person or (ii) any other  person of
which at least a majority of the voting interest under ordinary circumstances is
at the time, directly or indirectly, owned by such person.

          "Surviving Corporation" has the meaning set forth in Section 2.1.

          "Takeover Proposal" has the meaning set forth in Section 6.2(a).

          "Tax" or "Taxes" has the meaning set forth in Section 4.13(c).

          "Tax Controversy" has the meaning set forth in Section 4.13(c).

          "Tax Returns" has the meaning set forth in Section 4.13(c).

          "Termination Notice" has the meaning set forth in Section 2.4(iv).

          "Trading Day" shall mean any day on which securities are traded,  with
respect to Parent ADSs, on the NYSE, and with respect to Parent Ordinary Shares,
on the LSE.

          "VEBAs" has the meaning set forth in Section 4.10(a).

          "Voting Debt" has the meaning set forth in Section 4.2(a).

                                   ARTICLE II

                                   THE MERGER

          Section  2.1 The Merger.  Upon the terms and subject to the conditions
set forth in this Agreement,  at the Effective Time (as defined in Section 2.2),
Merger  Sub shall be merged  with and into the  Company in  accordance  with the
DGCL.  Following the Merger,  the separate  existence of Merger Sub shall cease,
and the Company shall be the surviving corporation in the Merger (the "Surviving
Corporation"),  shall succeed to and assume all rights and obligations of Merger
Sub and shall  continue to be governed by the laws of the State of Delaware with
all its rights, privileges, immunities, powers and franchises and shall continue
unaffected by the Merger except as set forth in this Article II.

          Section  2.2  Effective  Time.  As soon as  practicable  following the
satisfaction  or waiver of the conditions set forth in Article VIII, the Company
and Merger Sub will cause a certificate of merger (the  "Certificate of Merger")
to be executed  and filed with the  Secretary  of State of the State of Delaware
and  make  all  other  filings  or  recordings  required  by  applicable  law in
connection  with the Merger.  The Merger shall become  effective at such time as
the Certificate of Merger is duly filed with the Secretary of State of the State
of Delaware or at such later time as is specified in the  Certificate  of Merger
in accordance with the DGCL (the "Effective Time").

          Section  2.3 Effects of the Merger.  The Merger shall have the effects
set forth in the applicable provisions of the DGCL.

          Section  2.4 Exchange Ratio.  Except as provided in clause (a) and (b)
of Section  2.5,  at the  Effective  Time,  each share of Company  Common  Stock
outstanding  immediately  prior to the Effective Time shall,  in accordance with
Section  2.5(c) and (d), be converted into and shall be canceled in exchange for
the right to receive from Parent, a number of Parent Ordinary Shares  determined
as set forth below (the "Exchange Ratio"):

               (i) if the Parent Share Value is equal to or greater than $2.9475
          and  equal  to or less  than  $3.0294,  the  Exchange  Ratio  shall be
          determined by dividing $20.00 by the Parent Share Value;

               (ii) if the Parent  Share  Value is  greater  than  $3.4838,  the
          Exchange  Ratio shall be determined  by dividing  $23.00 by the Parent
          Share Value;

               (iii)if the Parent  Share Value is greater than $3.0294 and equal
          to or less than $3.4838, the Exchange Ratio will be 6.602;

               (iv) if the  Parent  Share  Value  is equal  to or  greater  than
          $2.5054 and less than $2.9475, the Exchange Ratio will be 6.7854;

               (v) if the Parent Share Value is less than $2.5054,  the Exchange
          Ratio  shall be  determined  by  dividing  $17.00 by the Parent  Share
          Value; provided, however,

               (vi) if the Parent Share Value is equal to or less than  $2.2106,
          then  Parent  shall  have the right to  terminate  the  Agreement,  by
          delivery  of  written  notice  to  such  effect  to the  Company  (the
          "Termination Notice"),  subject to the following sentence.  During the
          ten Business Days following the Company's  receipt of the  Termination
          Notice, the Company shall have the option to proceed, and cause Parent
          and Merger Sub to proceed,  with the Merger despite Parent's  delivery
          of a Termination Notice, which option shall be exercisable by means of
          written  notice to Parent to such effect  within such ten Business Day
          period,  in which  case the  Agreement  will  remain in full force and
          effect and the Exchange Ratio shall be fixed at 7.6902.

          Section  2.5 Conversion and Exchange of Shares. At the Effective Time:

          (a)  Cancellation  of  Treasury  Stock and Stock  Owned by Parent  and
Merger Sub. All shares of Company  Common Stock owned by the Company as treasury
stock and any shares of Company Common Stock owned by Parent,  Merger Sub or any
Subsidiary  of Parent or Merger  Sub  immediately  prior to the  Effective  Time
shall, by virtue of the Merger, and without any action on the part of the holder
thereof, no longer be outstanding, shall be canceled and retired without payment
of any consideration therefor and shall cease to exist.

          (b) Capital  Stock of Merger Sub. Each share of common stock of Merger
Sub outstanding  immediately  prior to the Effective Time shall be canceled and,
in  consideration  of the  issuance  of Parent  Ordinary  Shares as  provided by
Section 2.5(c),  the Surviving  Corporation shall issue to Parent such number of
shares of common stock,  $.01 par value per share,  in Surviving  Corporation as
shall be agreed  between  Merger Sub and Parent prior to the  Effective  Time to
have an aggregate  value equal to the Parent Ordinary Shares to be issued in the
Merger.

          (c) Conversion of Company Common Stock.  Except as provided in clauses
(a) and (b) of this Section 2.5, each share of Company Common Stock  outstanding
immediately  prior to the  Effective  Time shall be converted  into and shall be
canceled in exchange  for the right to receive  from Parent  pursuant to Section
2.5(d) a number of Parent  Ordinary  Shares equal to the Exchange  Ratio,  which
shall be  delivered  to the holders of Company  Common  Stock (i) in the form of
American  Depositary Shares (the "Parent ADSs"),  each representing the right to
receive five Parent Ordinary Shares (the "ADS  Consideration") or (ii) if and to
the extent elected by any such holder, in the manner provided in Section 2.6, in
the  form of  Parent  Ordinary  Shares,  in  registered  form  ("Ordinary  Share
Consideration"   and,   together  with  the  ADS   Consideration,   the  "Merger
Consideration"); provided, however, that the Parent ADSs may be evidenced by one
or  more  receipts  ("Parent  ADRs")  issued  in  accordance  with  the  Deposit
Agreement.  At the Effective  Time,  all Company Common Stock shall no longer be
outstanding,  shall be canceled  and retired and shall cease to exist,  and each
certificate (a "Certificate")  formerly  representing any of such Company Common
Stock  shall  thereafter   represent  only  the  right  to  receive  the  Merger
Consideration  and the right, if any, to receive pursuant to Section 2.7(e) cash
in lieu of fractional Parent ADSs (or, if applicable, fractional Parent Ordinary
Shares) and any dividend or  distribution  pursuant to Section  2.7(c),  in each
case without  interest.  Parent  shall,  following  the  Closing,  pay all stamp
duties,  stamp duty  reserve tax and other taxes and similar  levies  imposed in
connection with the issuance or creation of the Parent Ordinary  Shares,  Parent
ADSs and any Parent ADRs in connection therewith (such Parent Ordinary Shares or
Parent ADSs to be received by a holder may be referred to in this  Agreement  as
"Parent Shares").

          (d)  In  consideration  of  the  issue  to  Parent  by  the  Surviving
Corporation of shares of common stock of the Surviving  Corporation  pursuant to
Section 2.5(b) hereof,  Parent shall issue, in accordance with Section 2.7, such
number of Parent  Ordinary Shares as is equal to the number of shares of Company
Common Stock  outstanding  immediately prior to the Effective Time multiplied by
the  Exchange  Ratio,  to permit  (i) the  issuance  of Parent  ADSs and (ii) if
elected by any holder of Company Common Stock in the manner  provided in Section
2.6, the delivery of Parent Ordinary Shares,  in registered form, to the holders
of such Company Common Stock for the purpose of giving effect to the delivery of
the Merger Consideration referred to in Section 2.5(c).

          (e) In the event that,  subsequent  to the date of this  Agreement but
prior to the Effective Time, the Company changes the number of shares of Company
Common Stock, or Parent changes the number of Parent Ordinary Shares, issued and
outstanding as a result of a stock split,  stock  combination,  stock  dividend,
recapitalization,  redenomination of share capital or other similar transaction,
the Exchange  Ratio and other items  dependent  thereon  shall be  appropriately
adjusted.

          Section  2.6 Procedure for Election.  (a) Prior to the Effective Time,
the Company shall cause the Exchange  Agent to make  available to all holders of
Company Common Stock of record an election form and other appropriate  materials
(collectively,  the "Ordinary Election Form") providing for such holder to elect
to receive the Ordinary Share  Consideration  with respect to all or any portion
of such holder's shares of Company Common Stock (the "Ordinary Share Election").
Any shares of Company  Common  Stock with  respect to which there shall not have
been effected such election by submission to the Exchange Agent of an effective,
properly  completed  Ordinary  Share  Election  form  on or  prior  to the  date
specified in such form (the  "Election  Date"),  which shall be the date that is
three  days prior to the date of the  Company  Stockholders'  Meeting,  shall be
converted in the Merger into the right to receive the ADS Consideration.

          (b) Record  holders of shares of Company Common Stock who are nominees
only may submit a separate  Ordinary  Share  Election  Form for each  beneficial
owner for whom such record holder is a nominee; provided,  however, that, at the
request  of  Parent,   such  record  holder  shall  certify  to  the  reasonable
satisfaction  of Parent that such record holder holds such shares as nominee for
the beneficial  owner thereof.  For purposes of this Agreement,  each beneficial
owner for which an Ordinary  Share Election Form is submitted will be treated as
a separate holder of shares of Company Common Stock.

          Section  2.7 Exchange of Certificates. (a) Exchange Agent. Within five
business days  following  the Effective  Time (i) Parent shall issue and deposit
with the Depositary,  for the benefit of the holders of shares of Company Common
Stock  converted into the ADS  Consideration  in accordance with Section 2.5(c),
Parent Ordinary Shares in an amount sufficient to permit the Depositary to issue
Parent ADRs  representing the number of Parent ADSs issuable pursuant to Section
2.5(c) and (ii)  Parent  shall,  for the benefit of the holders of the shares of
Company Common Stock converted into Parent  Ordinary Shares in the Merger,  make
available to the Surviving  Corporation for deposit with a bank or trust company
designated  before the Closing Date by Parent and  reasonably  acceptable to the
Company (the "Exchange Agent"), (A) certificates representing the number of duly
authorized  whole Parent  Ordinary  Shares  issuable in accordance  with Section
2.5(c),  and (B) an amount of cash equal to the aggregate amount payable in lieu
of fractional  Parent ADSs and Parent Ordinary Shares in accordance with Section
2.7(e) (such cash,  certificates  representing Parent Ordinary Shares and Parent
ADRs representing Parent ADSs, together with any dividends or distributions with
respect thereto being  hereinafter  referred to as the "Exchange  Fund"),  to be
held for the benefit of and  distributed  to the holders of Company Common Stock
in  accordance  with this Section.  The Exchange  Agent shall agree to hold such
Parent  Ordinary  Shares and funds for delivery as contemplated by this Section,
and upon such additional  terms as may be agreed upon by the Exchange Agent, the
Company and Parent  shall  cause the  Depositary  to issue  through and upon the
instructions of the Exchange Agent,  for the benefit of the holders of shares of
the Company Common Stock converted into the ADS Consideration in accordance with
Section  2.5(c),  Parent ADRs  representing  the number of Parent ADSs  issuable
pursuant to Section 2.5(c).  Neither the Company, its affiliates nor the holders
of Company  Common  Stock shall be  responsible  for any stamp duty  reserve tax
payable in  connection  with the ADS  Consideration.  The  Exchange  Agent shall
invest any cash  included in the  Exchange  Fund as  directed  by the  Surviving
Corporation on a daily basis. Parent and the Surviving Corporation shall replace
any monies lost  through an  investment  made  pursuant to this Section 2.7. Any
interest and other income resulting from such investments shall promptly be paid
to the  Surviving  Corporation.  All Parent  Ordinary  Shares  and  Parent  ADSs
deposited  in the  Exchange  Fund shall,  as of the  Effective  Time,  have been
registered under the Securities Act pursuant to a registration statement on Form
F-4 declared effective by the SEC.

          (b) Exchange Procedures.  As soon as reasonably  practicable after the
Effective Time, the Surviving Corporation shall cause the Exchange Agent to mail
to each holder of record of a  Certificate  immediately  prior to the  Effective
Time whose  shares are  converted  pursuant to this Article II into the right to
receive Parent  Ordinary  Shares or Parent ADSs a letter of  transmittal  (which
shall specify that delivery shall be effected, and risk of loss and title to the
Certificates  shall pass, only upon delivery of the Certificates to the Exchange
Agent and shall be in such form and have such other  provisions as the Surviving
Corporation or Parent may reasonably specify) providing  instructions for use in
effecting  the   surrender  of   Certificates   in  exchange  for   certificates
representing  Parent ADRs which represent  Parent ADSs or Parent Ordinary Shares
and cash in lieu of  fractional  Parent  ADSs or Parent  Ordinary  Shares.  Upon
surrender of a Certificate for cancellation to the Exchange Agent, together with
such letter of  transmittal  duly executed and completed in accordance  with its
terms, the holder of such  Certificate  shall be entitled to receive in exchange
therefor (i) a certificate or certificates  representing one or more Parent ADRs
representing,  in the  aggregate,  that whole  number of Parent ADSs and/or that
whole number of Parent Ordinary Shares elected to be received in accordance with
Section 2.6, (ii) the amount of dividends or other distributions, if any, with a
record date on or after the Effective Time which theretofore became payable with
respect to such  Parent  ADSs and  Parent  Ordinary  Shares,  and (iii) the cash
amount payable in lieu of fractional  Parent ADSs and Parent  Ordinary Shares in
accordance with Section 2.7(e),  in each case which such holder has the right to
receive  pursuant to the  provisions of this Article II, and the  Certificate so
surrendered  shall  forthwith be  canceled.  In no event shall the holder of any
Certificate  be entitled to receive  interest on any funds to be received in the
Merger. In the event of a transfer of ownership of Company Common Stock which is
not  registered  in the  transfer  records  of the  Company,  a  certificate  or
certificates representing that whole number of Parent Ordinary Shares elected to
be  received  in  accordance  with  Section  2.6 and/or one or more  Parent ADRs
representing,  in the aggregate, that whole number of Parent ADSs, plus the cash
amount payable in lieu of fractional  Parent  Ordinary Shares and Parent ADSs in
accordance with Section 2.7(e), may be issued to a transferee if the Certificate
representing  such Company  Common  Stock is  presented  to the  Exchange  Agent
accompanied  by all documents  required to evidence and effect such transfer and
by evidence  that any  applicable  stock  transfer  taxes have been paid.  Until
surrendered  as  contemplated  by this  Section  2.7(b)  and  subject to Section
2.7(c),  each  Certificate  shall,  after the Effective Time,  represent for all
purposes  only the right to receive the whole number of Parent  Ordinary  Shares
and/or Parent ADSs into which the number of shares of Company Common Stock shown
thereon  have been  converted as  contemplated  by this Article II plus the cash
amount payable in lieu of fractional  Parent ADSs and Parent  Ordinary Shares in
accordance  with Section  2.7(e).  Notwithstanding  the foregoing,  certificates
representing  Company  Common  Stock  surrendered  for  exchange  by any  Person
constituting an "Affiliate" of the Company for purposes of Section 7.4 shall not
be exchanged  until Parent has  received an Affiliate  Agreement  (as defined in
Section 7.4) as provided in Section 7.4.

          (c) Distributions With Respect To Unexchanged  Shares. No dividends or
other distributions declared, made or paid after the Effective Time with respect
to Parent  Ordinary  Shares  with a record date on or after the  Effective  Time
shall be paid to the holder of any unsurrendered Certificate with respect to the
Parent Ordinary Shares and Parent ADSs  represented  thereby and no cash payment
in lieu of fractional  Parent  Ordinary  Shares and Parent ADSs shall be paid to
any such holder  pursuant to Section  2.7(e)  until the holder of record of such
Certificate  shall  surrender such  Certificate in accordance with this Section.
Subject  to the  effect of  applicable  laws,  following  surrender  of any such
Certificate,  there  shall  be paid to the  record  holder  of the  certificates
representing  Parent Ordinary Shares and the Parent ADRs which represent  Parent
ADSs  issued in exchange  therefor,  without  interest,  (i) at the time of such
surrender, the amount of dividends or other distributions, if any, with a record
date on or after the Effective Time which theretofore became payable,  but which
were not paid by reason of the immediately  preceding sentence,  with respect to
such Parent Ordinary Shares and Parent ADSs and (ii) at the appropriate  payment
date,  the amount of dividends or other  distributions  with a record date on or
after the Effective Time but prior to surrender and a payment date subsequent to
surrender  payable with respect to such Parent  Ordinary Shares and Parent ADSs.
Dividends or other  distributions  with a record date on or after the  Effective
Time but prior to  surrender  of  Certificates  by  holders  thereof  payable in
respect of Parent  Ordinary  Shares and Parent ADSs held by the  Exchange  Agent
shall be held in trust for the benefit of such holders of Certificates.

          (d) No Further  Ownership  Rights In Company Common Stock.  All Parent
Ordinary  Shares and Parent  ADSs  issued  upon the  surrender  for  exchange of
Certificates  in  accordance  with the  terms  hereof  (including  any cash paid
pursuant to Section 2.7(e)) shall be deemed to have been issued at the Effective
Time in full  satisfaction  of all rights  pertaining  to the  Converted  Shares
represented thereby, subject, however, to the Surviving Corporation's obligation
to pay any  dividends  which may have been declared by the Company on the shares
of Company Common Stock in accordance with the terms of this Agreement and which
remained  unpaid at the Effective  Time.  From and after the Effective Time, the
stock  transfer  books of the  Company  shall be closed  and  there  shall be no
further  registration of transfers thereon of the shares of Company Common Stock
which were  outstanding  immediately  prior to the Effective Time. If, after the
Effective Time,  Certificates are presented to the Surviving Corporation for any
reason, they shall be canceled and exchanged as provided in this Section.

          (e)  No  Fractional  Shares.  No  certificate  or  scrip  representing
fractional  Parent ADSs or Parent  Ordinary  Shares will be issued in the Merger
upon the surrender for exchange of Certificates,  and such fractional Parent ADS
or Parent Ordinary Share interests will not entitle the owner thereof to vote or
to any rights of a holder of Parent ADSs or Parent Ordinary  Shares.  In lieu of
any such  fractional  Parent  ADS or  Parent  Ordinary  Share,  each  holder  of
Certificates  who would otherwise have been entitled to a fraction of Parent ADS
or Parent  Ordinary  Share in exchange  for such  Certificates  pursuant to this
Section shall receive from the Exchange Agent, as applicable, (i) a cash payment
in lieu of such fractional  Parent ADS determined by multiplying (A) the average
of the  closing  sale prices for Parent ADSs on the NYSE as reported in The Wall
Street Journal for each of the 10 consecutive Trading Days immediately preceding
the Closing Date by (B) the fractional  Parent ADS interest to which such holder
would  otherwise  be  entitled,  and/or  (ii) a cash  payment  in  lieu  of such
fractional  Parent  Ordinary Share  determined by multiplying (A) the average of
the closing  middle market  quotation of a Parent  Ordinary  Share on the LSE as
reported in The  Financial  Times for each of the 10  consecutive  Trading  Days
ending  immediately  preceding  the Closing  Date by (B) the  fractional  Parent
Ordinary Share interest to which such holder would otherwise be entitled.

          (f)  Termination  Of Exchange  Fund.  Any portion of the Exchange Fund
which remains  undistributed to the stockholders of the Company for one (1) year
after the  Effective  Time shall be delivered to or as directed by Parent,  upon
demand,  and any holders of Certificates who have not theretofore  complied with
this  Article II shall  thereafter  look only to Parent  (subject  to  abandoned
property,  escheat and other similar laws) as a general  creditor for payment of
their claim for Parent ADSs, Parent Ordinary shares, any cash in lieu fractional
Parent ADSs and Parent Ordinary Shares and any dividends or  distributions  with
respect  to Parent  ADSs and  Parent  Ordinary  Shares.  Neither  Parent nor the
Surviving  Corporation  shall be liable to any  holder  of any  Certificate  for
Parent  ADSs or Parent  Ordinary  Shares (or  dividends  or  distributions  with
respect to  either),  or cash  payable in respect of  fractional  Parent ADSs or
Parent  Ordinary  Shares,  delivered  to  a  public  official  pursuant  to  any
applicable abandoned property, escheat or similar law. Any securities or amounts
remaining  unclaimed by holders of Parent Shares three years after the Effective
Time (or such earlier date immediately  prior to such time as such amounts would
otherwise  escheat to or become property of any  governmental  entity) shall, to
the extent  permitted by  applicable  law,  become the property of the Surviving
Corporation  free and clear of any claims or interest  of any Person  previously
entitled thereto.

          (g) Lost, Stolen or Destroyed  Certificates.  If any Certificate shall
have been lost,  stolen or  destroyed,  upon the making of an  affidavit of that
fact by the person  claiming such  Certificate  to be lost,  stolen or destroyed
and,  if  required  by  Parent,  the  posting  by such  person of a bond in such
reasonable  amount as Parent may direct as indemnity  against any claim that may
be made against it with  respect to such  Certificate,  the Exchange  Agent will
deliver  in  exchange  for  such  lost,  stolen  or  destroyed  Certificate  the
applicable  Merger  Consideration  with respect to the shares of Company  Common
Stock formerly  represented  thereby, any cash in lieu of fractional Parent ADSs
or Parent Ordinary Shares,  and unpaid dividends and distributions in respect of
or on Parent ADSs or Parent  Ordinary  Shares  deliverable  in respect  thereof,
pursuant to this Agreement.

          Section  2.8 Withholding Rights. Each of the Surviving Corporation and
Parent shall be entitled to deduct and withhold from the consideration otherwise
payable  pursuant to this  Agreement  to any holder of shares of Company  Common
Stock such amounts as it is required to deduct and withhold  with respect to the
making of such  payment  under the Code,  or any  provision  of state,  local or
foreign tax law,  including  the tax laws of the United  Kingdom.  To the extent
that amounts are so withheld by the Surviving Corporation or Parent, as the case
may be,  such  withheld  amounts  shall  be  treated  for all  purposes  of this
Agreement  as having  been paid to the holder of the  shares of  Company  Common
Stock in  respect  of  which  such  deduction  and  withholding  was made by the
Surviving Corporation or Parent, as the case may be.

          Section  2.9 Company Stock Options;  Other  Stock-Based  Plans. (a) At
the Effective  Time,  the board of directors of the Company (or the  appropriate
committee  thereof) shall have adopted such resolutions,  taken such actions and
obtained any necessary consents as may be required to effect the following:

                  (i) adjust or implement,  as may be applicable or appropriate,
         the terms of all outstanding and unexercised  stock options to purchase
         shares of Company  Common Stock  (each,  a "Stock  Option")  heretofore
         granted under the Company Stock Plan (as defined in Section 4.2(a)) and
         the terms of the Company  Stock Plan to provide  that at the  Effective
         Time, each Stock Option  outstanding and unexercised  immediately prior
         to the  Effective  Time  shall be  deemed  to  constitute  an option to
         acquire,  pursuant  to the  terms of the  Company  Stock  Plan,  Parent
         Ordinary  Shares  where  (x)  the  number  of  Parent  Ordinary  Shares
         purchasable  upon exercise of each such Stock Options shall be equal to
         the number of shares of  Company  Common  Stock  that were  purchasable
         under  such  Stock  Option  immediately  prior  to the  Effective  Time
         multiplied by the Exchange Ratio,  subject to adjustment as provided in
         Section 2.5(e),  and rounding down to the nearest whole Parent Ordinary
         Share and (y) the per Parent  Ordinary  Share exercise price under each
         such Stock Option shall be obtained by dividing the per share  exercise
         price of each such Stock Option by the Exchange Ratio and dividing such
         result by the  Exchange  Rate,  subject to  adjustment  as  provided in
         Section 2.5(e), and rounding down to the nearest penny. Notwithstanding
         the foregoing,  in the case of any Stock Option to which Section 421 of
         the Code applies by reason of its  qualification  under  Section 422 of
         the Code ("qualified  stock options"),  the option price, the number of
         shares  purchasable  pursuant  to such  Stock  Option and the terms and
         conditions  of exercise of such Stock  Option  shall be  determined  in
         order to comply  with  Section  424(a) of the Code.  Accordingly,  with
         respect to any qualified  stock options,  the per Parent Ordinary Share
         exercise price shall be rounded up to the nearest cent;

                  (ii) adjust or implement, as may be applicable or appropriate,
         the terms of all outstanding stock units,  deferred stock awards, stock
         appreciation  rights and other rights to acquire  Company Common Stock,
         restricted  stock,  or any other  interest in respect of Company Common
         Stock under any Company stock plan,  program,  arrangement or agreement
         set  forth in  Section  2.9(a) of the  Company  Disclosure  Letter  (as
         defined herein),  other than Stock Options ("Company Stock Rights"), to
         provide that, at the Effective Time, (x) each holder of a Company Stock
         Right shall be entitled to that number of stock units,  deferred  stock
         awards,  stock  appreciation  rights  or  other  corresponding  rights,
         including shares of restricted stocks, as the case may be, with respect
         to Parent  Ordinary  Shares ("Parent Share Rights") equal to the number
         of  applicable  Company  Stock  Rights held by such holder  immediately
         prior to the Closing  multiplied  by the  Exchange  Ratio,  on the same
         terms and conditions as were applicable under such Company Stock Right,
         as adjusted in accordance with this Section 2.9,  subject to adjustment
         as provided in Section  2.5(e),  and rounding down to the nearest whole
         Parent Ordinary  Share,  and (y) the share value on the grant date with
         respect to each Parent Share Right shall be equal to the share value on
         the grant date of the  corresponding  Company  Stock Right as in effect
         immediately prior to the Effective Time,  divided by the Exchange Ratio
         and dividing such result by the Exchange Rate, subject to adjustment as
         provided in Section 2.5(e), and rounding down to the nearest penny; and

                  (iii) make such other  changes to the  Company  Stock Plan and
         any other plan,  program,  arrangement  or agreement  providing for the
         issuance  or grant of any other  interest  in  respect  of, or  payment
         determined  by reference to, the capital stock of the Company or any of
         its  subsidiaries as appropriate to give effect to the Merger,  subject
         to approval by Parent.

          (b) As of the  Effective  Time,  Parent  agrees  to  assume  all Stock
Options  and  Company  Stock  Rights  in  accordance   with  the  terms  hereof.
Immediately following the Effective Time, Parent shall deliver to the holders of
Stock Options and Company Stock Rights  appropriate  notices  setting forth such
holders'  rights  pursuant  to  the  applicable  Company  stock  plan,  program,
arrangement or agreement, and the agreements evidencing the grants of such Stock
Options and Company Stock Rights shall  continue in effect on the same terms and
conditions (subject to the adjustments required by this Section 2.9 after giving
effect to the Merger).  After the Effective  Time,  Parent shall comply with the
terms of the Company Stock Plan, as adjusted in accordance  with Section 2.5(e).
Parent  shall take all  corporate  action  necessary  to reserve for  issuance a
sufficient  number of Parent Ordinary Shares for delivery upon exercise of Stock
Options  assumed by it in accordance with Section 2.9.  Simultaneously  with the
Closing,  Parent shall file a registration statement on Form S-3 or Form S-8, as
the case may be (or any successor or other appropriate forms), which shall cover
all of the  Parent  Ordinary  Shares to be  issued  upon the  exercise  of Stock
Options  assumed by Parent in accordance with this Section 2.9 and shall use its
reasonable  best  efforts to maintain  the  effectiveness  of such  registration
statement or  registration  statements  (and maintain the current  status of the
prospectus or prospectuses contained therein) for so long as such options remain
outstanding.

          (c) During  the period  from the date of this  Agreement  through  the
Effective  Time,  the Company  agrees that it will not grant any stock  options,
stock appreciation rights, stock units, deferred stock awards or other rights to
acquire Company Common Stock or any other interest in Company Common Stock other
than required automatic grants of Stock Options to the Company's directors under
the  Company  Stock  Plan  and  will  not take  any  action  to  accelerate  the
exercisability  of Stock  Options or Company  Stock  Rights,  and/or permit cash
payments to holders of Stock  Options or Company  Stock  Rights with  respect to
such Stock Options or Company Stock Rights. It is acknowledged that the terms of
the Company  Stock Option Plan provide that all  outstanding  Stock Options will
become  immediately  vested and  exercisable in the event of a Change of Control
(as defined therein).

          Section   2.10  The  Surviving  Corporation.  (a) The  certificate  of
incorporation  of Merger Sub, as in effect  immediately  prior to the  Effective
Time  shall  be  amended  to  change  the  name of  Merger  Sub to  "Healthworld
Corporation"  and, as so amended,  shall be the Certificate of  Incorporation of
the  Surviving  Corporation  until  thereafter  changed or  amended as  provided
therein or applicable Law.

          (b) The  bylaws of Merger  Sub as in effect  immediately  prior to the
Effective Time, shall be the bylaws of the Surviving  Corporation  until amended
in accordance  with therein or the Certificate of  Incorporation  and applicable
Law.

          (c) From and after  the  Effective  Time,  until  successors  are duly
elected or appointed and qualified in accordance  with  applicable  Law, (i) the
directors  of Merger Sub at the  Effective  Time shall be the  directors  of the
Surviving Corporation, and (ii) the officers of Merger Sub at the Effective Time
shall be the officers of the Surviving Corporation.


                                   ARTICLE III

                                   THE CLOSING

          Section  3.1 Closing.  The closing of the Merger (the "Closing") shall
take  place (i) at the  offices  of  Macfarlanes,  10  Norwich  Street,  London,
EC4A1BD, with a meeting to be held simultaneously at the offices of White & Case
LLP, 1155 Avenue of the Americas,  New York, New York 10036, for the delivery of
certain documents in connection therewith, at a time to be agreed by the parties
on the third  business day after the day on which the last of the conditions set
forth in Article VIII (other than those  conditions  that by their nature are to
be fulfilled at the Closing,  but subject to the  fulfillment  or waiver of such
conditions)  shall be fulfilled or waived in accordance  with this  Agreement or
(ii) at such other  places and time and/or on such other date as the Company and
Parent may agree in writing (the "Closing Date").


                                   ARTICLE IV

                  REPRESENTATIONS AND WARRANTIES OF THE COMPANY

          The  Company  represents  and  warrants  to Parent  and  Merger Sub as
follows:

          Section  4.1 Organization, Standing and Power. The Company and each of
its Subsidiaries is a corporation or limited  liability  company duly organized,
validly  existing and in good  standing  (with  respect to  jurisdictions  which
recognize the concept of good standing)  under the laws of the  jurisdiction  in
which it is incorporated  or organized and has the requisite  corporate or other
power and authority to own, lease and operate its properties and to carry on its
business as now being conducted  except for such failures to be so incorporated,
existing  and in good  standing  or to have  such  power and  authority,  which,
individually  or in the  aggregate,  could not be reasonably  expected to have a
Company  Material  Adverse Effect.  The Company and each of its  Subsidiaries is
duly  qualified  to do  business,  and is in  good  standing  (with  respect  to
jurisdictions   which  recognize  the  concept  of  good   standing),   in  each
jurisdiction  where the character of its properties owned or held under lease or
the nature of its activities makes such  qualification  necessary,  except where
the failure to be so qualified could not reasonably be expected to, individually
or in the aggregate,  have a Company  Material  Adverse Effect.  The Company has
made  available  to Parent and Merger Sub  complete  and  correct  copies of the
certificate  of  incorporation  and by-laws of the  Company  and the  comparable
governing documents of each of its Subsidiaries,  in each case as amended to the
date of this  Agreement.  Other than as set forth in  Section  4.1 of the letter
dated the date  hereof  and  delivered  by the  Company to Parent and Merger Sub
simultaneously  with the execution and delivery of this  Agreement (the "Company
Disclosure Letter"), the respective certificates of incorporation and by-laws or
other organizational documents of the Subsidiaries of the Company do not contain
any provision  limiting or otherwise  restricting  the ability of the Company to
control such Subsidiaries.

          Section   4.2  Capital  Structure.  (a) As of  the  date  hereof,  the
authorized capital stock of the Company consists of twenty million  (20,000,000)
shares of Company Common Stock and one million  (1,000,000)  shares of preferred
stock, par value $.01 per share ("Preferred Stock"). At the close of business on
November 5, 1999,  (i) 8,109,965  shares of Company Common Stock were issued and
outstanding,  all of which were validly issued, fully paid and nonassessable and
free of preemptive  rights,  (ii) no shares of Company Common Stock were held in
the  treasury  of the  Company  or by  Subsidiaries  of the  Company  and  (iii)
1,880,799  shares of Company  Common  Stock were  reserved  for future  issuance
pursuant to the Company's 1997 Stock Option Plan, as amended (the "Company Stock
Plan").  No shares of Preferred  Stock are  outstanding.  As of the date of this
Agreement, except (i) as set forth above and (ii) as set forth in Section 4.2(a)
of the Company  Disclosure  Letter,  no shares of capital  stock or other voting
securities of the Company were issued, reserved for issuance or outstanding. The
Company  does  not  have  any  outstanding  bonds,  debentures,  notes  or other
obligations  the  holders  of  which  have  the  right  to vote  (or  which  are
convertible  into or exercisable  for securities  having the right to vote) with
the stockholders of the Company on any matter ("Voting Debt"). As of the date of
this  Agreement,  except for stock  options  covering not in excess of 1,536,089
shares of Company Common Stock issued under the Company Stock Plan and except as
set forth in  Section  4.2(a) of the  Company  Disclosure  Letter,  there are no
outstanding or authorized  options,  warrants,  calls,  rights or subscriptions,
claims of any character, obligations,  convertible or exchangeable securities or
other commitments,  contingent or otherwise,  to which the Company is a party or
by which it is bound obligating the Company or any of its Subsidiaries to issue,
deliver or sell, or cause to be issued,  delivered or sold, additional shares of
capital  stock of the  Company  or any of its  Subsidiaries  or  obligating  the
Company  or any of its  Subsidiaries  to grant,  extend  or enter  into any such
option, warrant, call, right or agreement (each an "Issuance Obligation").

          (b) Section 4.2(b) of the Company Disclosure Letter sets forth (i) the
name and jurisdiction of  incorporation of each Subsidiary of the Company,  (ii)
its authorized  capital stock, (iii) the number of issued and outstanding shares
of its capital  stock and (iv) the record  owners of such shares.  Except as set
forth in Section 4.2(b) of the Company Disclosure Letter, all of the outstanding
capital stock of, or ownership  interests in, each  Subsidiary of the Company is
owned by the Company, directly or indirectly.  All of the issued and outstanding
shares of capital stock of each Subsidiary are validly existing,  fully paid and
non-assessable. Except as set forth in the Company SEC Reports or Section 4.2(b)
of the Company  Disclosure  Letter, no Subsidiary of the Company has outstanding
Voting Debt and no Subsidiary of the Company is bound by,  obligated  under,  or
party to an Issuance  Obligation  with respect to any security of the Company or
any Subsidiary of the Company. Except as set forth in the Company SEC Reports or
Section 4.2(b) of the Company  Disclosure  Letter,  all of such capital stock or
ownership  interest is owned by the Company,  directly or  indirectly,  free and
clear of all Liens.

          (c) Except for the Company's interest in its Subsidiaries,  and as set
forth in the  Company SEC  Reports or Section  4.2(c) of the Company  Disclosure
Letter,  the Company does not directly or  indirectly  own any equity or similar
interest in, or any interest convertible into or exchangeable or exercisable for
any equity or similar interest in, any corporation,  partnership, joint venture,
limited  liability  company or other business  association or entity (other than
non-controlling  investments  in the ordinary  course of business and  corporate
partnering,  development,  cooperative  marketing and similar  undertakings  and
arrangements entered into in the ordinary course of business).

          Section  4.3 Authority Relative to this Agreement. The Company has all
requisite  corporate  power and  authority  to enter into this  Agreement,  and,
subject to obtaining the Company  Stockholders'  Approval (as defined in Section
7.3(b)), to perform its obligations hereunder and to consummate the transactions
contemplated  hereby. The execution,  delivery and performance of this Agreement
by the  Company  and  the  consummation  by  the  Company  of  the  transactions
contemplated  hereby have been duly authorized by all necessary corporate action
on the part of the Company  (other  than  obtaining  the  Company  Stockholders'
Approval),  including  the  unanimous  approval of the Board of Directors of the
Company  which has  unanimously  resolved  to  recommend  the  approval  of this
Agreement by the stockholders of the Company and directed that this Agreement be
submitted to the  stockholders  of the Company for their  consideration,  and no
other corporate  proceedings on the part of the Company or its  stockholders are
necessary to authorize the execution, delivery and performance of this Agreement
by the  Company  and  the  consummation  by  the  Company  of  the  transactions
contemplated  hereby, other than obtaining the Company  Stockholders'  Approval.
This  Agreement has been duly and validly  executed and delivered by the Company
and constitutes a legal, valid and binding obligation of the Company enforceable
against the Company in accordance with its terms,  except as enforceability  may
be  limited  by  bankruptcy,  insolvency,  reorganization,  moratorium  or other
similar laws  affecting the  enforcement of creditors'  rights  generally and by
general  equitable  principles  (regardless  of whether such  enforceability  is
considered in a proceeding in equity or at law).

          Section   4.4  Non-Contravention;  Approvals  and  Consents.  (a)  The
execution  and  delivery  of this  Agreement  by the  Company  do  not,  and the
performance by the Company of its obligations  hereunder and the consummation of
the  transactions  contemplated  hereby  will not,  conflict  with,  result in a
violation or breach of,  constitute  (with or without notice or lapse of time or
both) a default  under,  result in or give to any person any right of payment or
reimbursement,  termination,  cancellation,  modification or acceleration of, or
result in the  creation  or  imposition  of any Lien  upon any of the  assets or
properties of the Company or any of its  Subsidiaries  under,  any of the terms,
conditions or provisions of (i) the certificates or articles of incorporation or
bylaws (or other  comparable  charter  documents)  of the  Company or any of its
Subsidiaries,  or (ii)  subject to the  obtaining  of the Company  Stockholders'
Approval and the taking of the actions described in Section 4.4(b) and except as
disclosed in Section 4.4(a) of the Company  Disclosure  Letter, (x) any statute,
law, rule, regulation or ordinance (together,  "Laws"), or any judgment, decree,
order, writ, permit or license  (together,  "Orders"),  of any court,  tribunal,
arbitrator,  authority, agency, commission, official or other instrumentality of
the United States, any foreign country or any domestic or foreign state, county,
city or other political  subdivision (a "Governmental or Regulatory  Authority")
applicable to the Company or any of its  Subsidiaries or any of their respective
assets or  properties,  or (y) any note,  bond,  mortgage,  security  agreement,
indenture,  license,  franchise,  permit,  concession,  contract, lease or other
instrument, obligation or agreement of any kind (together, "Contracts") to which
the Company or any of its Subsidiaries is a party or by which the Company or any
of its  Subsidiaries or any of their  respective  assets or properties is bound,
excluding  from  the  foregoing  clauses  (x)  and  (y)  conflicts,  violations,
breaches,   defaults,   rights  of  payment  and  reimbursement,   terminations,
modifications,  accelerations  and  creations  and  impositions  of Liens which,
individually  or in the  aggregate,  could not  reasonably be expected to have a
Company Material  Adverse Effect or prevent,  materially  impair,  or materially
delay the ability of the Company to consummate the transactions  contemplated by
this Agreement.

          (b) Except (i) for the filing of a  premerger  notification  report by
the Company under the Hart-Scott-Rodino  Antitrust  Improvements Act of 1976, as
amended, and the rules and regulations  thereunder (the "HSR Act"), (ii) for the
filing of the Proxy Statement (as defined in Section 4.6(a) and the Registration
Statement  (as defined in Section  5.9(a)) with the SEC pursuant to the Exchange
Act  and  the  Securities  Act,  the  declaration  of the  effectiveness  of the
Registration  Statement  by the SEC and filings with  various  state  securities
authorities that are required in connection with the  transactions  contemplated
by this  Agreement,  (iii) for the filing of the Certificate of Merger and other
appropriate  merger  documents  required by the DGCL with the Secretary of State
and appropriate documents with the relevant authorities of other states in which
the Constituent Corporations are qualified to do business, and (iv) as disclosed
in Section  4.4(b) of the Company  Disclosure  Letter,  no consent,  approval or
action of, filing with or notice to any Governmental or Regulatory  Authority or
other public or private  third party is  necessary or required  under any of the
terms,  conditions  or  provisions  of any law or order of any  Governmental  or
Regulatory  Authority  or  any  Contract  to  which  the  Company  or any of its
Subsidiaries  is a party or by which the Company or any of its  Subsidiaries  or
any of their  respective  assets or  properties  is bound for the  execution and
delivery of this Agreement by the Company, the performance by the Company of its
obligations  hereunder  or the  consummation  of the  transactions  contemplated
hereby, other than such consents,  approvals, actions, filings and notices which
the  failure  to make or  obtain,  as the  case may be,  individually  or in the
aggregate,  could not reasonably be expected to have a Company  Material Adverse
Effect or  prevent,  materially  impair or  materially  delay the ability of the
Company to consummate the transactions contemplated by this Agreement.

          Section  4.5 Sec Reports and Financial Statements. (a) The Company has
delivered or made  available  to Parent a true and  complete  copy of each form,
report, schedule,  registration statement,  definitive proxy statement and other
document (together with all amendments thereof and supplements thereto) filed by
the Company or any of its Subsidiaries  with the SEC since November 21, 1997 (as
such documents have since the time of their filing been amended or supplemented,
the "Company SEC Reports"),  which are all the documents (other than preliminary
materials) that the Company and its Subsidiaries  were required to file with the
SEC since such date. As of their  respective  dates, the Company SEC Reports (i)
complied  as to form in all  material  respects  with  the  requirements  of the
Securities Act or the Exchange Act, if applicable,  as the case may be, and (ii)
did not  contain  any untrue  statement  of a  material  fact or omit to state a
material  fact  required to be stated  therein or necessary in order to make the
statements  therein,  in light of the circumstances  under which they were made,
not  misleading.  The audited  consolidated  financial  statements and unaudited
interim consolidated financial statements  (including,  in each case, the notes,
if any,  thereto)  of the Company  included  in the  Company  SEC  Reports  (the
"Company  Financial  Statements")  complied as to form in all material  respects
with the published rules and regulations of the SEC with respect  thereto,  were
prepared  in  accordance  with U.S.  generally  accepted  accounting  principles
applied on a  consistent  basis  during the periods  involved  (except as may be
indicated  therein or in the notes  thereto and except with respect to unaudited
statements as permitted by Form 10-Q of the SEC) and fairly present (subject, in
the case of the unaudited interim  financial  statements,  to normal,  recurring
year-end audit adjustments (which are not expected to be, individually or in the
aggregate,  materially  adverse to the Company and its  Subsidiaries  taken as a
whole)) the consolidated  financial position of the Company and its consolidated
subsidiaries as at the respective dates thereof and the consolidated  results of
their operations and cash flows for the respective periods then ended. Except as
set forth in Section 4.5(a) of the Company Disclosure Letter, each Subsidiary of
the  Company is  treated  as a  consolidated  subsidiary  of the  Company in the
Company Financial Statements for all periods covered thereby.

          (b) Except as set forth in the Company  SEC Reports or Section  4.5(b)
of  the  Company  Disclosure  Letter,   neither  the  Company  nor  any  of  its
Subsidiaries  has any liability or obligation  of any nature  (whether  accrued,
absolute,  contingent or  otherwise),  except for  liabilities  and  obligations
incurred in the ordinary course of business  consistent with past practice since
June 30, 1999 which could not reasonably be expected to,  individually or in the
aggregate,  have a Company Material Adverse Effect.  Neither the Company nor any
of its  Subsidiaries  is in  default  in  respect  of  the  material  terms  and
conditions of any  indebtedness or other agreement which could,  individually or
in the aggregate, be expected to have a Company Material Adverse Effect.

          Section  4.6 Information Supplied. (a) The proxy statement relating to
the Company  Stockholders' Meeting (as defined in Section 7.3(b)), as amended or
supplemented  from time to time (as so  amended  and  supplemented,  the  "Proxy
Statement"),  and any other documents to be filed by the Company with the SEC in
connection with the Merger and the other transactions  contemplated  hereby will
(in the case of the Proxy  Statement and any such other documents filed with the
SEC under the  Exchange  Act or the  Securities  Act),  comply as to form in all
material  respects with the  requirements of the Exchange Act and the Securities
Act,  respectively,  and will not,  on the date of its filing or, in the case of
the Proxy Statement, on the date it is mailed to stockholders of the Company and
at the time of the Company Stockholders'  Meeting,  contain any untrue statement
of a material  fact or omit to state any  material  fact  required  to be stated
therein or necessary in order to make the  statements  therein,  in light of the
circumstances  under  which  they  are  made,  not  misleading,  except  that no
representation  is made by the Company with respect to  information  supplied in
writing by or on behalf of Parent or Merger Sub expressly for inclusion  therein
and  information  incorporated  by  reference  therein from  documents  filed by
Parent, Merger Sub or any of their respective Subsidiaries with the SEC.

          (b) The  information  supplied  by the Company  for  inclusion  in any
filing by Parent or Merger Sub with the LSE in respect of the Merger (including,
without limitation,  the Class 1 circular to be issued to shareholders of Parent
(the  "Circular"),  and the listing  particulars  under Part IV of the Financial
Services Act 1986 of the United Kingdom (the "FSA")  relating to Parent Ordinary
Shares (the "Listing Particulars")  (together with any amendments or supplements
thereto,  the "Parent Disclosure  Documents") will be, in all material respects,
in  accordance  with the facts and will not omit anything  materially  likely to
affect the import of such information.

          (c) Notwithstanding  the foregoing  provisions of this Section 4.6, no
representation  or warranty is made by the Company  with  respect to  statements
made or  incorporated  by reference  in the  Registration  Statement,  the Proxy
Statement or the Parent  Disclosure  Documents based on information  supplied by
Parent or Merger Sub  expressly  for  inclusion  or  incorporation  by reference
therein.

          Section   4.7  Absence of Certain  Events.  Except as disclosed in the
Company SEC Reports or in Section 4.7 of the Company  Disclosure  Letter,  since
June 30, 1999, the Company and its  Subsidiaries  have operated their respective
businesses  only in the ordinary  course  consistent  with past  practices  and,
except as  disclosed in the Company SEC Reports or in Section 4.7 of the Company
Disclosure  Letter,  there  has  not  occurred  (i)  any  event,  occurrence  or
conditions which, individually or in the aggregate, could reasonably be expected
to have a Company Material Adverse Effect; (ii) any entry into or any commitment
or  transaction  that,  individually  or in the aggregate,  could  reasonably be
expected to have a Company Material Adverse Effect; (iii) any material change by
the Company or any of its Subsidiaries in its accounting methods,  principles or
practices; (iv) any amendments or changes in the Certificate of Incorporation or
Bylaws  of  the  Company;  (v)  any  revaluation  by the  Company  or any of its
Subsidiaries of any of their respective assets,  including,  without limitation,
write-offs  of accounts  receivable,  other than in the  ordinary  course of the
Company's and its Subsidiaries' businesses consistent with past practices;  (vi)
any  damage,  destruction  or  loss  which,  individually  or in the  aggregate,
resulted in or could  reasonably be expected to have a Company  Material Adverse
Effect; (vii) any event pursuant to which the Company or any of its Subsidiaries
has incurred any material  liabilities  (direct,  contingent  or  otherwise)  or
engaged in any material  transaction or entered into any material agreement,  in
each case outside the ordinary course of business which,  individually or in the
aggregate,  could be  reasonably  expected  to have a Company  Material  Adverse
Effect; (viii) any increase in the compensation of any officer of the Company or
any of its  Subsidiaries  or any  general  salary or  benefits  increase  to the
employees of the Company or any of its  Subsidiaries  other than in the ordinary
course of business;  or (ix) any  declaration,  setting  aside or payment of any
dividend or other  distribution  with respect to any shares of capital  stock of
the Company,  or any repurchase,  redemption or other acquisition by the Company
or any of its  Subsidiaries of any outstanding  shares of capital stock or other
securities of, or other ownership interests in, the Company. Except as set forth
in the Company SEC  Reports or Section  4.7 of the  Company  Disclosure  Letter,
since June 30, 1999,  neither the Company nor any of its  Subsidiaries has taken
any action specified in Section 6.1 of this Agreement.

          Section   4.8  Litigation.  Except as  disclosed in Section 4.8 of the
Company  Disclosure  Letter,  there  are no  investigations,  actions,  suits or
proceedings pending against the Company or its Subsidiaries or, to the knowledge
of the Company,  threatened  against the Company or its  Subsidiaries (or any of
their  respective  properties,  rights or franchises),  at law or in equity,  or
before or by any federal or state commission,  board, bureau, agency, regulatory
or administrative instrumentality or other Governmental Entity or any arbitrator
or  arbitration  tribunal,  that could  reasonably be expected to have a Company
Material  Adverse Effect,  and, to the knowledge of the Company,  no development
has  occurred  with  respect  to any  pending  or  threatened  action,  suit  or
proceeding  that could  reasonably  be expected to result in a Company  Material
Adverse  Effect or could  prevent,  materially  impair or  materially  delay the
consummation of the transactions  contemplated  hereby.  Neither the Company nor
any of its  Subsidiaries is subject to any judgment,  order or decree entered in
any lawsuit or proceeding  which could  reasonably be expected to have a Company
Material Adverse Effect.

          Section   4.9  Compliance  with  Applicable  Law.  The Company and its
Subsidiaries  hold, and at all required times have held, all permits,  licenses,
variances,  exceptions,  orders  and  approvals  of  all  Governmental  Entities
necessary for the lawful conduct of their  respective  businesses  (the "Company
Permits"),  except  for  failures  to hold such  permits,  licenses,  variances,
exemptions, orders and approvals which could not reasonably be expected to have,
individually or in the aggregate, a Company Material Adverse Effect. The Company
and its  Subsidiaries  are, and at all times have been, in  compliance  with the
terms of the Company  Permits,  except  where the failure so to comply could not
reasonably  be expected to have,  individually  or in the  aggregate,  a Company
Material Adverse Effect.  The businesses of the Company and its Subsidiaries are
not being,  and have not been,  conducted in violation of any law,  ordinance or
regulation  of  any  Governmental  Entity  except  for  violations  or  possible
violations  which,  individually  or in the  aggregate,  do not  and  could  not
reasonably be expected to have a Company Material Adverse Effect.  Except as set
forth in Section 4.9 of the  Company  Disclosure  Letter,  no  investigation  or
review by any  Governmental  Entity  with  respect to the  Company or any of its
Subsidiaries is pending or, to the knowledge of the Company, threatened, nor, to
the knowledge of the Company, has any Governmental Entity indicated an intention
to conduct the same,  other than, in each case, those which could not reasonably
be  expected  to have,  individually  or in the  aggregate,  a Company  Material
Adverse Effect.

          Section  4.10 Employee Plans.  (a) List of Plans. Set forth in Section
4.10(a) of the Company Disclosure Letter is an accurate and complete list of all
domestic and foreign (i) "employee benefit plans," within the meaning of Section
3(3) of the Employee Retirement Income Security Act of 1974, as amended, and the
rules and regulations  thereunder  ("ERISA");  (ii) bonus,  stock option,  stock
purchase,  restricted stock,  incentive,  fringe benefit,  "voluntary employees'
beneficiary  associations"  ("VEBAs"),  under  Section  501(c)(9)  of the  Code,
profit-sharing,  pension or retirement,  deferred  compensation,  medical, life,
disability,  accident, salary continuation,  severance, accrued leave, vacation,
sick pay, sick leave,  supplemental  retirement and unemployment  benefit plans,
programs,  arrangements,  commitments and/or practices (whether or not insured);
and (iii)  employment,  consulting,  termination,  and  severance  contracts  or
agreements;  in each case for active,  retired or former employees or directors,
whether or not any such plans, programs, arrangements,  commitments,  contracts,
agreements  and/or  practices  (referred to in (i),  (ii) or (iii) above) are in
writing or are otherwise  exempt from the  provisions  of ERISA;  that have been
established,  maintained  or  contributed  to  (or  with  respect  to  which  an
obligation  to  contribute  has been  undertaken)  or with  respect to which any
potential  liability  is  borne  by the  Company  or  any  of  its  Subsidiaries
(including,  for this purpose and for the purpose of all of the  representations
in  this  Section  4.10,  any  predecessors  to  the  Company  or to  any of its
Subsidiaries  and all  employers  (whether  or not  incorporated)  that would be
treated  together  with  the  Company  and any of its  Subsidiaries  as a single
employer  (1) within the meaning of Section 414 of the Code,  or (2) as a result
of the Company or any Subsidiary  being or having been a general  partner of any
such employer), since January 1, 1993 ("Employee Benefit Plans").

          (b)  Status of Plans.  Except as set forth in  Section  4.10(b) of the
Company  Disclosure  Letter,  each Employee  Benefit Plan (including any related
trust) complies in form with the requirements of all applicable laws, including,
without limitation, ERISA and the Code, and has at all times been maintained and
operated in substantial  compliance  with its terms and the  requirements of all
applicable laws, including,  without limitation, ERISA and the Code. No complete
or partial  termination of any Employee Benefit Plan has occurred or is expected
to occur.  Except as set forth in  Section  4.10(b)  of the  Company  Disclosure
Letter,  neither  the Company nor any of its  Subsidiaries  has any  commitment,
intention or understanding  to create,  modify or terminate any Employee Benefit
Plan.  Except as required to maintain the  tax-qualified  status of any Employee
Benefit Plan intended to qualify under Section  401(a) of the Code, no condition
or  circumstance  exists that would prevent the amendment or  termination of any
Employee  Benefit Plan.  No event has occurred and no condition or  circumstance
has existed  that could result in a material  increase in the benefits  under or
the expense of maintaining any Employee  Benefit Plan from the level of benefits
or expense incurred for the most recent fiscal year ended thereof.

          (c) No Pension Plans. No Employee Benefit Plan is an "employee pension
benefit plan"  (within the meaning of Section 3(2) of ERISA)  subject to Section
412 of the Code or Section 302 or Title IV of ERISA. Neither the Company nor any
of its Subsidiaries has ever maintained or contributed to, or had any obligation
to contribute to (or borne any liability with respect to) any "multiple employer
plan" (within the meaning of the Code or ERISA) or any "multiemployer  plan" (as
defined in Section 4001(a)(3) of ERISA).

          (d)  Liabilities.  Neither  the  Company  nor any of its  Subsidiaries
maintains any Employee Benefit Plan which is a "group health plan" (as such term
is defined in Section  607(1) of ERISA or Section  5000(b)(1)  of the Code) that
has not been  administered  and operated in all respects in compliance  with the
applicable  requirements of Part 6 of Subtitle B of Title I of ERISA and Section
4980B of the Code except to the extent that such  non-compliance will not result
in any material  liability to the Company or any of its Subsidiaries and neither
the Company nor any of its  Subsidiaries  is subject to any material  liability,
including, without limitation, additional contributions, fines, taxes, penalties
or loss of tax deduction as a result of such  administration  and operation.  No
Employee Benefit Plan which is such a group health plan is a "multiple  employer
welfare  arrangement,"  within  the  meaning  of  Section  3(40) of ERISA.  Each
Employee  Benefit Plan that is intended to meet the  requirements of Section 125
of the Code meets such  requirements,  and each  program of  benefits  for which
employee  contributions  are provided  pursuant to elections  under any Employee
Benefit Plan meets the requirements of the Code applicable thereto.  Neither the
Company nor any of its Subsidiaries maintains any Employee Benefit Plan which is
an "employee  welfare  benefit plan" (as such term is defined in Section 3(1) of
ERISA) that has provided any "disqualified  benefit" (as such term is defined in
Section  4976(b)  of the Code)  with  respect  to which an  excise  tax could be
imposed.

          Neither the Company nor any of its Subsidiaries maintains any Employee
Benefit Plan (whether  qualified or  non-qualified  under Section  401(a) of the
Code) providing for  post-employment  or retiree health,  life insurance  and/or
other welfare benefits and having unfunded liabilities,  and neither the Company
nor any of its Subsidiaries  have any obligation to provide any such benefits to
any retired or former  employees or active  employees  following such employees'
retirement  or  termination  of  service.  Neither  the  Company  nor any of its
Subsidiaries has any unfunded  liabilities pursuant to any Employee Benefit Plan
that is not  intended  to be  qualified  under  Section  401(a) of the Code.  No
Employee  Benefit Plan holds as an asset any  interest in any annuity  contract,
guaranteed  investment  contract or any other investment or insurance  contract,
policy or  instrument  issued by an insurance  company that, to the knowledge of
the  Company,  is  or  may  be  the  subject  of  bankruptcy,   conservatorship,
insolvency, liquidation, rehabilitation or similar proceedings.

          Neither the  Company  nor any of its  Subsidiaries  has  incurred  any
material  liability  for any tax or excise tax arising  under  Chapter 43 of the
Code,  and no event has occurred and no  condition or  circumstance  has existed
that could give rise to any such liability.

          There are no actions,  suits,  claims or disputes pending,  or, to the
best knowledge and belief of the Company, threatened, anticipated or expected to
be asserted  against or with respect to any Employee  Benefit Plan or the assets
of any such plan (other than  routine  claims for benefits and appeals of denied
routine claims).  No civil or criminal action brought pursuant to the provisions
of Title I, Subtitle B, Part 5 of ERISA is pending, threatened,  anticipated, or
expected to be asserted  against the Company or any of its  Subsidiaries  or any
fiduciary of any Employee Benefit Plan, in any case with respect to any Employee
Benefit  Plan. No Employee  Benefit Plan or any  fiduciary  thereof has been the
direct or indirect  subject of an audit,  investigation  or  examination  by any
governmental or quasi-governmental agency.

          (e)  Contributions.  Full  payment has been timely made of all amounts
which the Company or any of its  Subsidiaries is required,  under applicable law
or under any  Employee  Benefit Plan or any  agreement  relating to any Employee
Benefit Plan to which the Company or any of its Subsidiaries is a party, to have
paid as  contributions or premiums thereto as of the last day of the most recent
fiscal year of such  Employee  Benefit Plan ended prior to the date hereof.  All
such  contributions  and/or  premiums  have been fully  deducted  for income tax
purposes  and no  such  deduction  has  been  challenged  or  disallowed  by any
governmental entity, and to the best knowledge and belief of the Company and its
Subsidiaries no event has occurred and no condition or circumstance  has existed
that could give rise to any such challenge or disallowance. The Company has made
adequate provision for reserves to meet contributions and premiums and any other
liabilities  that have not been paid or  satisfied  because they are not yet due
under  the  terms  of any  Employee  Benefit  Plan,  applicable  law or  related
agreements.  Benefits under all Employee  Benefit Plans are as  represented  and
have not been increased  subsequent to the date as of which  documents have been
provided.

          (f) Tax  Qualification.  Each  Employee  Benefit  Plan  intended to be
qualified  under  Section  401(a) of the Code has, as currently in effect,  been
determined  to be so  qualified  by the  Internal  Revenue  Service.  Each trust
established in connection with any Employee Benefit Plan which is intended to be
exempt from Federal  income  taxation  under Section  501(a) of the Code has, as
currently in effect,  been  determined  to be so exempt by the Internal  Revenue
Service.  Each VEBA has been  determined by the Internal  Revenue  Service to be
exempt from Federal  income tax under Section  501(c)(9) of the Code.  Since the
date of each most recent  determination  referred to in this  paragraph  (f), no
event has occurred and no condition or circumstance has existed that resulted or
is likely to result in the  revocation of any such  determination  or that could
adversely  affect the qualified  status of any such Employee Benefit Plan or the
exempt status of any such trust or VEBA.

          (g) Transactions.  Neither the Company nor any of its Subsidiaries nor
any of their respective directors, officers, employees or, to the best knowledge
and belief of the Company, other persons who participate in the operation of any
Employee  Benefit Plan or related trust or funding  vehicle,  has engaged in any
transaction with respect to any Employee Benefit Plan or breached any applicable
fiduciary  responsibilities  or  obligations  under  Title I of ERISA that would
subject any of them to a tax,  penalty or liability for prohibited  transactions
or  breach of any  obligations  under  ERISA or the Code or would  result in any
claim being made under, by or on behalf of any such Employee Benefit Plan by any
party with standing to make such claim.

          (h) Triggering  Events.  Except as set forth in Section 4.10(h) of the
Company  Disclosure Letter, the execution of this Agreement and the consummation
of the transactions  contemplated  hereby,  do not constitute a triggering event
under any Employee Benefit Plan, policy, arrangement,  statement,  commitment or
agreement,  whether or not legally enforceable,  which (either alone or upon the
occurrence  of any  additional  or  subsequent  event) will or may result in any
payment  (whether of severance pay or otherwise),  "parachute  payment" (as such
term is defined in Section 280G of the Code), acceleration,  vesting or increase
in benefits to any employee or former employee or director of the Company or any
of its  Subsidiaries.  Except as set forth in  Section  4.10(h)  of the  Company
Disclosure  Letter,  no  Employee  Benefit  Plan  provides  for the  payment  of
severance, termination, change in control or similar-type payments or benefits.

          (i)  Documents.  The Company has delivered or made available or caused
to be delivered to the Purchaser and its counsel true and complete copies of all
material  documents in connection  with each Employee  Benefit Plan,  including,
without  limitation  (where  applicable):  (i) all Employee  Benefit Plans as in
effect on the date hereof,  together with all amendments thereto,  including, in
the case of any  Employee  Benefit  Plan not set  forth in  writing,  a  written
description  thereof;  (ii) all current summary plan descriptions,  summaries of
material  modifications,  and material  communications;  (iii) all current trust
agreements, declarations of trust and other documents establishing other funding
arrangements  (and all amendments  thereto and the latest  financial  statements
thereof);  (iv) the most recent Internal  Revenue Service  determination  letter
obtained  with respect to each  Employee  Benefit Plan  intended to be qualified
under Section  401(a) of the Code or exempt under Section 501(a) or 501(c)(9) of
the Code; (v) the annual report on Internal  Revenue Service Form 5500-series or
990 for each of the last three years for each Employee  Benefit Plan required to
file such form; (vi) the most recently  prepared  financial  statements for each
Employee  Benefit Plan for which such  statements  are  required;  and (vii) all
contracts  and  agreements  relating to each Employee  Benefit Plan,  including,
without limitation,  service provider agreements,  insurance contracts,  annuity
contracts,   investment   management   agreements,    subscription   agreements,
participation agreements, and recordkeeping agreements and collective bargaining
agreements.

          Section  4.11 Employment Relations and Agreement.  (a) Except as could
not  reasonably  be expected  to have a Company  Material  Adverse  Effect or as
disclosed in Section 4.11(a) of the Company  Disclosure  Letter, (i) each of the
Company and its  Subsidiaries  is, and at all times has been, in compliance with
all applicable federal, state or other applicable laws respecting employment and
employment  practices,  terms and  conditions of employment and wages and hours,
and has not and is not  engaged in any  unfair  labor  practice;  (ii) no unfair
labor  practice  complaint  against  the Company or any of its  Subsidiaries  is
pending  before the  National  Labor  Relations  Board;  (iii) there is no labor
strike,  dispute,  slowdown or stoppage actually pending or, to the knowledge of
the  Company,  threatened  against  or  involving  the  Company  or  any  of its
Subsidiaries; (iv) no representation question exists respecting the employees of
the Company or any of its Subsidiaries;  (v) no grievance exists, no arbitration
proceeding  arising  out of or under  any  collective  bargaining  agreement  is
pending and no claim therefor has been asserted;  (vi) no collective  bargaining
agreement  is  currently  being   negotiated  by  the  Company  or  any  of  its
Subsidiaries;  and (vii)  none of the  Company or any of its  Subsidiaries  have
experienced any material labor difficulty during the last three years.

          (b) Except for employment  agreements  with employees with salaries of
over $175,000 or (pound)150,000 per annum (the "Material Employment Agreements")
executed  copies or terms of which,  as  amended,  have been  delivered  or made
available  to  Parent,  and as set  forth  in  Section  4.11(b)  of the  Company
Disclosure  Letter,  neither  the Company  nor any of its  Subsidiaries  has any
Material  Employment  Agreement or material severance agreement with any person.
The executed copies of the Material Employment  Agreements  previously delivered
or made  available to Parent are true and correct and such  agreements  have not
since been  amended,  modified or  rescinded  except to the extent  disclosed to
Parent.

          Section   4.12  Contracts.  Except as set forth in Section 4.12 of the
Company Disclosure  Letter,  neither the Company nor its Subsidiaries is a party
to, or has any  obligation  under,  any  Contract  which  contains  any covenant
currently  or  prospectively  limiting  the freedom of the Company or any of its
Subsidiaries  to engage in any line of business  or to compete  with any entity.
All Contracts to which the Company or any of its  Subsidiaries  is a party or by
which any of their  respective  assets is bound are valid and  binding,  in full
force and effect and enforceable  against the parties thereto in accordance with
their respective terms, other than such failures to be so valid and binding,  in
full force and effect or enforceable  which, could not reasonably be expected to
have,  either  individually  or in the  aggregate,  a Company  Material  Adverse
Effect.  There is not under any such  Contract  any existing  default,  or event
which,  after notice or lapse of time, or both, would  constitute a default,  by
the Company or any of its Subsidiaries, or to the Company's knowledge, any other
party,  except to the extent such default  could not  reasonably  be expected to
have a Company Material Adverse Effect.

          Section   4.13  Taxes.  (a) The  Company and each  Subsidiary  (i) has
timely filed or will timely file all  material Tax Returns  required to be filed
on or before the Effective Time, which returns are and will be true and complete
in all material  respects;  and (ii) the Company and each  Subsidiary has timely
paid or has adequately disclosed, and fully provided for as Taxes on the Company
Financial  Statements  in  accordance  with  United  States  generally  accepted
accounting principles, consistently applied, all Taxes which are due and payable
with  respect to all taxable  years or periods that end on or before the date of
this  Agreement.  The Company and each  Subsidiary has withheld or collected all
Taxes they were  required to withhold and  collect,  and have timely paid to the
proper  authorities  such  Taxes  withheld  or  collected  to the extent due and
payable.

          (b) Except as set forth in Section  4.13(b) of the Company  Disclosure
Letter,  (i) neither the  Company nor any  Subsidiary  has waived any statute of
limitations  in respect of Taxes of the Company or any  Subsidiary;  and (ii) no
issues have been raised by any relevant taxing  authority in connection with any
review by such taxing authority of the Tax Returns through a notice or any other
written  correspondence from such taxing authority,  and neither the Company nor
any of its  Subsidiaries  is subject  to an audit,  examination,  action,  suit,
proceeding,  investigation  or claim regarding Taxes ("Tax  Controversy") by the
appropriate taxing authorities of any nation,  state,  province or locality that
is currently  pending (or scheduled as of the Effective Time to be conducted) or
that has been threatened in writing by any such authority  regarding  Taxes; and
(iii) all deficiencies  asserted or assessments made as a result of any such Tax
Controversy  by a taxing  authority have been paid in full; and (iv) no liens or
security  interests arising in connection with a failure (or alleged failure) to
pay any Taxes have attached to any of the Company's or any of its  Subsidiaries'
assets,  except for Liens for Taxes not yet due and  payable.  The  Company  has
delivered or made available to Parent correct and complete  copies of all United
States federal, state and all foreign income Tax Returns (to the extent filed as
of the date hereof or, if not filed,  correct and complete  copies of extensions
thereof),  examination reports, and statements of deficiencies  assessed against
or agreed to by the  Company  and any of its  Subsidiaries  relating  to taxable
years 1996, 1997 and 1998.

          (c) For purposes of this  Agreement (i) "Tax" (and,  with  correlative
meaning,  "Taxes" and  "Taxable")  means any  material  federal,  state,  local,
foreign or other income, gross receipts, profits, property, sales, use, license,
excise, franchise,  employment,  payroll, premium,  withholding,  alternative or
added minimum, ad valorem,  transfer stamp,  severance,  capital gains,  capital
stock or excise tax, or any other tax, levy custom,  duty,  governmental  fee or
other  like  assessment  or charge  of any kind  whatsoever,  together  with any
interest or penalty, imposed by any governmental authority and shall include any
liability  for such amounts as a result  either of being a member of a combined,
consolidated,  unitary or  affiliated  group or of a  contractual  obligation to
indemnify  any  person or other  entity  with  respect  to Taxes,  and (ii) "Tax
Return" means any material return, form, report or similar statement required to
be filed with respect to any Tax (including any schedules, related or supporting
information),  including,  without limitation, any information return, claim for
refund, amended return or declaration of estimated Tax.

          (d) Except as set forth in Section  4.13(d) of the Company  Disclosure
Letter,  none  of the  Company  or any of its  Subsidiaries  has  agreed  to any
extension of time with respect to a Tax assessment or deficiency.

          (e) Except as set forth in Section  4.13(e) of the Company  Disclosure
Letter, neither the Company nor any of its Subsidiaries has been included in any
"consolidated," "unitary" or "combined" Tax Return provided for under the law of
the United States, any foreign  jurisdiction or any state,  province or locality
with  respect  to  Taxes  for any  taxable  period  for  which  the  statute  of
limitations has not expired.

          (f) Except as set forth in Section  4.13(f) of the Company  Disclosure
Letter,  there  are no  tax  sharing,  allocation,  indemnification  or  similar
agreements  in  effect  as  between  the  Company  or  its  Subsidiaries  or any
predecessor  or  affiliate  thereof and any other  party  under which  Parent or
Merger Sub, the Company or its  Subsidiaries  could be liable for Taxes or other
claims of any party.

          (g) No  election  under  Section  341(f)  of the Code has been made or
shall  be  made  prior  to the  Effective  Time  to  treat  the  Company  or its
Subsidiaries as a consenting corporation, as defined in Section 341 of the Code.

          (h)  Neither  the  Company  nor any of its  Subsidiaries  is a "United
States  real  property  holding  corporation"  within  the  meaning  of  Section
897(c)(2) of the Code.

          (i) Except as set forth in Section  4.13(i) of the Company  Disclosure
Letter,  neither the Company nor any of its  Subsidiaries  has been  required to
include in income any adjustments  pursuant to section 481 of the Code by reason
of a voluntary  change in accounting  method  initiated by the Company or any of
its Subsidiaries, and the Internal Revenue Service has not initiated or proposed
any such adjustment or change in accounting period.

          Section   4.14   Intellectual   Property.   (a)  The  Company  or  its
Subsidiaries owns, free and clear of all Liens, licenses and other restrictions,
or is licensed to use, the worldwide rights to all domestic and foreign patents,
patent applications,  registered and unregistered  trademarks and service marks,
trade names,  company  names,  copyrights  together with any  registrations  and
applications   therefor,   Internet  domain  names,   schematics,   inventories,
technology,  trade  secrets,  proprietary  information,   know-how,   databases,
inventions,  computer  software  programs  or  applications  including,  without
limitation,  all object and source codes and tangible or intangible  proprietary
information  or material  that in any material  respect are used or necessary in
the business of the Company and any of its  Subsidiaries as currently  conducted
(the "Intellectual Property").  Section 4.14(a) of the Company Disclosure Letter
sets forth:  (i) all  material  patents,  patent  applications,  registered  and
unregistered   trademarks  and  service  marks,  trade  names,   company  names,
registered copyrights,  and any applications therefor, foreign and domestic; and
(ii) all material  licenses and other  agreements to which the Company or any of
its  Subsidiaries is a party (the  "Licenses") and pursuant to which the Company
or any of its  Subsidiaries is authorized to use any  Intellectual  Property and
includes the identities of the parties thereto,  a description of the nature and
subject matter thereof, the applicable royalty and the term thereof. Neither the
Company  nor  any of its  Subsidiaries  is,  or as a  result  of the  execution,
delivery or  performance  of the  Company's  obligations  hereunder  will be, in
violation of, or lose any rights pursuant to, any license or agreement set forth
in Section 4.14(a) of the Company Disclosure Letter.

          (b) No claims have been  asserted or, to the knowledge of the Company,
are  threatened  by any  person or  entity  nor does the  Company  or any of its
Subsidiaries know of any grounds for any bona fide claims (i) to the effect that
the  manufacture,  sale,  use,  offer for sale,  reproduction,  distribution  or
modification,  of  any  product  or  process  by  the  Company  or  any  of  its
Subsidiaries  infringes or within the three (3) year period immediately prior to
the date hereof has infringed any copyright, trade secret, trademark,  patent or
other  intellectual  property  right of any  person or  entity,  (ii)  that,  if
sustained,  might  adversely  effect the  interests of the Company or any of its
Subsidiaries in any Intellectual  Property,  or (iii) challenging the ownership,
validity or enforceability of any of the Intellectual  Property. All patents and
all registered  trademarks and service marks set forth in Section 4.14(a) of the
Company  Disclosure  Letter and all copyrights held by the Company or any of its
Subsidiaries are valid, enforceable and subsisting.  To the Company's knowledge,
there  has not  been and  there is not any  unauthorized  use,  infringement  or
misappropriation  of any of the  Intellectual  Property by any person or entity,
including, without limitation, any employee or former employee.

          (c) The  operation  of the  Company  as of the  Effective  Time  shall
require no rights  under  Intellectual  Property  other  than the  rights  under
Intellectual  Property  owned by the Company  and rights  granted to the Company
pursuant to the Licenses.

          Section  4.15 Environmental Laws and Regulations.  (a) For purposes of
this section,  "Environmental  Law" shall mean any federal,  state or local law,
statute,  rule,  regulation,  order or other  requirement of law relating to the
protection  of human  health or the  environment,  or to the  manufacture,  use,
transport,  treatment,  storage,  disposal,  release  or  threatened  release of
petroleum  products,  asbestos,  urea formaldehyde  insulation,  polychlorinated
biphenyls  or any  substance  listed,  classified  or  regulated as hazardous or
toxic, or any similar term, under such Environmental Law.

          (b)  Except  as could not  reasonably  be  expected  to have a Company
Material  Adverse  Effect,  (i) the Company is in compliance with all applicable
Environmental  Laws,  and has obtained,  and is in compliance  with, all permits
required under applicable  Environmental Laws; (ii) the Company has not received
any notice of any claims,  proceedings or actions by any governmental  authority
or  other  person  or  entity  pending  or,  to the  knowledge  of the  Company,
threatened  against the Company  under any  Environmental  Law; and (iii) to the
knowledge  of the  Company,  there are no  facts,  circumstances  or  conditions
relating to the business or operations  of the Company,  or to any real property
at any time owned,  leased or operated by the Company,  that could reasonably be
expected to give rise to any claim,  proceeding or action,  or to any liability,
under any Environmental Law.

          Section  4.16 Voting Requirements. The affirmative vote of the holders
of at least a majority of the outstanding shares of Company Common Stock (voting
as one  class,  with each  share of Company  Common  Stock  having one (1) vote)
entitled to be cast  approving this Agreement and the Merger is the only vote of
the holders of any class or series of the Company's  capital stock  necessary to
approve this  Agreement,  the Merger and the  transactions  contemplated by this
Agreement.

          Section  4.17  Ownership of Parent Stock.  Neither the Company nor any
of its Subsidiaries beneficially owns any Parent Ordinary Shares or Parent ADSs.

          Section  4.18 State Takeover Statutes; Certain Charter Provisions. The
Board of Directors of the Company has, to the extent such statute is applicable,
taken all action (including  appropriate  approvals of the Board of Directors of
the Company) necessary to exempt Parent, its Subsidiaries, their affiliates, the
Merger,  this  Agreement,   the  Stockholder  Agreements  and  the  transactions
contemplated  hereby and thereby  from  Section 203 of the DGCL.  No other state
takeover statutes are applicable to the Merger, this Agreement,  the Stockholder
Agreements and the transactions contemplated hereby and thereby.

          Section  4.19  Year 2000.  Except as set forth in Section  4.19 of the
Company  Disclosure  Letter or except as would not result in a Company  Material
Adverse Effect,  to the knowledge of the Company,  all software  material to the
business, finances or operations of the Company ("Software"):

                  (i) shall accurately and completely process (including but not
         limited  to  calculation,  comparison  and  sequencing,  and  including
         without limitation leap year calculations)  date-related data for dates
         prior to the year  2000,  date-related  data for  dates  after the year
         1999,  and  date-related  data for dates both  before the year 2000 and
         after the year 1999; and

                  (ii) shall not, as a consequence of the change of centuries or
         of the fact that dates from more than one century are being  processed,
         cause an abnormal termination of execution,  an endless loop, incorrect
         values or invalid results,  or otherwise fail to perform accurately and
         completely   those   functions  set  forth  in  the   associated   user
         documentation.

          Section  4.20 Brokers. No broker, investment banker or other person or
entity,  other than Bear Stearns & Co. Inc., the fees and expenses of which will
be paid by the Company,  is entitled to any broker's,  finder's or other similar
fee or commission  in  connection  with the  transactions  contemplated  by this
Agreement based upon  arrangements  made by or on behalf of the Company.  A true
and  correct  copy of the  engagement  letter of Bear  Stearns & Co.  Inc. as in
effect on the date hereof has been delivered to Parent.


                                  ARTICLE V

             REPRESENTATIONS AND WARRANTIES OF PARENT AND MERGER SUB

Parent and Merger Sub represent and warrant to the Company as follows:

          Section  5.1 Organization and Qualification Each of Merger Sub, Parent
and Parent's Material  Subsidiaries is a corporation duly incorporated,  validly
existing and in good standing (with respect to jurisdictions which recognize the
concept of good standing) under the laws of its  jurisdiction  of  incorporation
and has full corporate power and authority to conduct its business as and to the
extent now  conducted and to own,  operate and lease its assets and  properties,
except for such  failures to be so  incorporated,  existing and in good standing
(with respect to jurisdictions  which recognize the concept of good standing) or
to have such power and authority which, individually or in the aggregate,  could
not reasonably be expected to have a Parent  Material  Adverse  Effect.  Each of
Merger  Sub,  Parent and  Parent's  Material  Subsidiaries,  is duly  qualified,
licensed or admitted to do business  and is in good  standing  (with  respect to
jurisdictions which recognize the concept of good standing) in each jurisdiction
in which the  ownership,  use or leasing of its  assets and  properties,  or the
conduct  or  nature  of  its  business,  makes  such  qualification,  licensing,
admission  or  good  standing  necessary,  except  for  such  failures  to be so
qualified  (with respect to  jurisdictions  which  recognize the concept of good
standing)  which,  individually  or in the  aggregate,  could not  reasonably be
expected  to have a  Parent  Material  Adverse  Effect.  Parent  has  previously
delivered or made  available to the Company  correct and complete  copies of the
memorandum and articles of association and bylaws (or other  comparable  charter
documents) of Merger Sub, Parent and Parent's Material Subsidiaries.

          Section  5.2 Capital Stock. (a) The authorized share capital of Parent
consists solely of (i) 301,000,000  Parent Ordinary Shares, of which 226,858,671
shares were issued and outstanding  and 27,266,007  shares are subject to future
issuance  pursuant  to  Parent's  share  options  and  incentive  schemes  as of
September 30, 1999. All of the issued Parent Ordinary Shares are, and all Parent
Ordinary  Shares to be issued as the Ordinary  Share  Consideration  and the ADS
Consideration   pursuant  to  Section  2.5(c)  will  be,  upon  issuance,   duly
authorized,  validly issued and fully paid and voting, and no class of shares is
entitled to preemptive rights, except as provided in Section 89 of the Companies
Act of 1985 of the United Kingdom (the "Companies Act").

          (b) The  authorized  capital  stock of Merger  Sub  consists  of 1,000
shares of common  stock,  par value  $.01 per  share,  all of which are  validly
issued and  outstanding,  fully paid and  nonassessable  and are owned by Parent
free and clear of all  security  interests,  liens,  claims,  pledges,  options,
rights of first refusal, agreements, charges or other encumbrances of any nature
or any other  limitation or restriction  (including any restriction on the right
to vote or sell the same, except as may be provided under applicable  Federal or
State securities laws) (collectively, "Liens").

          (c) Except as disclosed  in the Parent SEC Reports  filed prior to the
date hereof or Section  5.2(c) of the letter dated the date hereof and delivered
by Parent and Merger Sub to the Company  simultaneously  with the  execution and
delivery of this Agreement (the "Parent  Disclosure  Letter"),  there are no (i)
outstanding  Issuance  Obligations  obligating  Merger  Sub,  Parent  or  any of
Parent's  Subsidiaries  to issue or sell any Parent  Ordinary  Shares or capital
stock of Merger Sub or any of Parent's Material Subsidiaries or to grant, extend
or enter into any such  Issuance  Obligation,  (ii) Voting Debt of the Parent or
any of its  Material  Subsidiaries,  or (iii)  voting  trusts,  proxies or other
commitments,  understandings,  restrictions or arrangements to which Merger Sub,
Parent or any of Parent's  Material  Subsidiaries is a party with respect to the
voting of or the right to  participate in dividends or other earnings in respect
of any shares of Merger Sub, Parent or any of Parent's Material Subsidiaries.

          (d) Except as set forth in the Company  SEC Reports or Section  5.2(d)
of the Parent  Disclosure  Letter,  all of the outstanding  capital stock of, or
ownership  interests in, each Material  Subsidiary of Parent is owned by Parent,
directly or  indirectly.  All of the issued and capital  stock of each  Material
Subsidiary is validly  existing,  fully paid and  non-assessable.  Except as set
forth in the  Company  SEC  Reports or Section  5.2(d) of the Parent  Disclosure
Letter,  no Material  Subsidiary  of Parent has  outstanding  Voting Debt and no
Material  Subsidiary  of  Parent is bound by,  obligated  under,  or party to an
Issuance  Obligation  with  respect to any  security  of Parent or any  Material
Subsidiary  of Parent.  Except as set forth in the Parent SEC Reports or Section
5.2(d) of the Parent Disclosure  Letter,  all of such capital stock or ownership
interest  is owned by  Parent,  directly  or  indirectly,  free and clear of all
Liens.

          Section  5.3 Authority Relative to this Agreement.  Each of Parent and
Merger  Sub has full power and  authority  to enter  into this  Agreement,  and,
subject to obtaining  the Parent  Shareholders'  Approval (as defined in Section
7.3(a)),   to  perform  its  obligations   hereunder,   and  to  consummate  the
transactions  contemplated  hereby.  The execution,  delivery and performance of
this Agreement by each of Parent and Merger Sub and the  consummation by each of
Parent and Merger Sub of the transactions contemplated hereby have been duly and
validly  approved by the Board of  Directors of Parent and Merger Sub. The Board
of Directors of Parent has passed a resolution declaring the advisability of the
Merger and  resolving  that the Merger be  submitted  for  consideration  by the
shareholders of Parent. No other corporate  proceedings on the part of Parent or
Merger Sub or their  shareholders  are  necessary  to authorize  the  execution,
delivery  and  performance  of this  Agreement  by Parent or Merger  Sub and the
consummation by Parent and Merger Sub of the transactions  contemplated  hereby,
other than obtaining the Parent Shareholders'  Approval. This Agreement has been
duly and validly  executed  and  delivered  by each of Parent and Merger Sub and
constitutes a legal,  valid and binding  obligation of each of Parent and Merger
Sub  enforceable  against each of Parent and Merger Sub in  accordance  with its
terms,  except as  enforceability  may be  limited  by  bankruptcy,  insolvency,
reorganization,  moratorium or other similar laws  affecting the  enforcement of
creditors' rights generally and by general equitable  principles  (regardless of
whether such enforceability is considered in a proceeding in equity or at law).

          Section  5.4  Non-Contravention;  Approvals  and  Consents.  (a)  The
execution  and  delivery of this  Agreement  by each of Parent and Merger Sub do
not,  and the  performance  by each of Parent and Merger Sub of its  obligations
hereunder and the consummation of the transactions contemplated hereby will not,
conflict with,  result in a violation or breach of,  constitute (with or without
notice  or lapse  of time or both) a  default  under,  result  in or give to any
person  any  right  of  payment  or  reimbursement,  termination,  cancellation,
modification or acceleration  of, or result in the creation or imposition of any
Lien upon any of the  assets  or  properties  of  Parent or any of its  Material
Subsidiaries  under,  any of the  terms,  conditions  or  provisions  of (i) the
memorandum or articles of  association  or bylaws (or other  comparable  charter
documents) of Parent or any of its Material  Subsidiaries or (ii) subject to the
obtaining  of the Parent  Shareholders'  Approval  and the taking of the actions
described  in  paragraph  (b) of this  Section,  (x) any Laws or  Orders  of any
Governmental  or  Regulatory  Authority  applicable  to  Parent  or  any  of its
Subsidiaries  or any of  their  respective  assets  or  properties,  or (y)  any
Contracts  to which  Parent  or any of its  Subsidiaries  is a party or by which
Parent  or  any of  its  Subsidiaries  or any  of  their  respective  assets  or
properties is bound, excluding from the foregoing clauses (x) and (y) conflicts,
violations,   breaches,   defaults,   rights  of   payment   or   reimbursement,
terminations,  modifications,  accelerations  and creations and  impositions  of
Liens which, individually or in the aggregate,  could not reasonably be expected
to have a Parent  Material  Adverse  Effect  or  prevent,  materially  impair or
materially  delay the  ability  of  Parent  and  Merger  Sub to  consummate  the
transactions contemplated by this Agreement.

          (b) Except (i) for the filing of a  premerger  notification  report by
Parent under the HSR Act, (ii) for the filing of the Registration Statement with
the SEC pursuant to the Securities Act, the declaration of the  effectiveness of
the Registration  Statement by the SEC and filings with various state securities
authorities that are required in connection with the  transactions  contemplated
by this  Agreement,  (iii) for the filing of the Certificate of Merger and other
appropriate  merger  documents  required by the DGCL with the Secretary of State
and appropriate documents with the relevant authorities of other states in which
the Constituent  Corporations are qualified to do business, (iv) for the filings
with,  notices to, and approvals  of, the LSE and NYSE,  (v) the approval of any
jurisdictional  state  regulating  agencies,  and (vi) as  disclosed  in Section
5.4(b) of the Parent  Disclosure  Letter,  no  consent,  approval  or action of,
filing  with or notice to any  Governmental  or  Regulatory  Authority  or other
public or private  third party is necessary or required  under any of the terms,
conditions or provisions of any law or order of any  Governmental  or Regulatory
Authority or any Contract to which Parent or any of its  Subsidiaries is a party
or by which Parent or any of its Subsidiaries or any of their respective  assets
or properties is bound for the execution and delivery of this  Agreement by each
of Parent and Merger Sub,  the  performance  by each of Parent and Merger Sub of
its obligations  hereunder or the consummation of the transactions  contemplated
hereby other than such consents,  approvals,  actions, filings and notices which
the  failure  to make or  obtain,  as the  case may be,  individually  or in the
aggregate,  could not reasonably be expected to have a Parent  Material  Adverse
Effect or prevent,  materially  impair or materially delay the ability of Parent
and Merger Sub to consummate the transactions contemplated by this Agreement.

          Section  5.5  SEC  Reports  and  Financial  Statements.   Parent   has
delivered  or made  available  to the Company a true and  complete  copy of each
form, report, schedule,  registration statement,  definitive proxy statement and
other document  (together with all amendments  thereof and supplements  thereto)
filed by Parent or any of its Subsidiaries with the SEC and each biannual report
distributed  by  Parent  to its  shareholders  since  December  1, 1997 (as such
documents have since the time of their filing been amended or supplemented,  the
"Parent SEC  Reports"),  which are all the  documents  (other  than  preliminary
materials)  that Parent was required to file with the SEC since such date. As of
their  respective  dates,  the Parent SEC Reports (i)  complied in all  material
respects with the requirements of the Securities Act or the Exchange Act, as the
case may be, and (ii) did not contain any untrue statement of a material fact or
omit to state a material  fact  required to be stated  therein or  necessary  in
order to make the statements  therein, in light of the circumstances under which
they were made, not misleading.  The audited  consolidated  financial statements
and unaudited interim  consolidated  financial  statements  (including,  in each
case, the notes, if any, thereto) included in the Parent SEC Reports complied in
all material  respects with the published  rules and regulations of the SEC with
respect thereto,  were prepared in accordance with generally accepted accounting
principles  in the United  Kingdom  applied  on a  consistent  basis  during the
periods involved (except as may be indicated therein or in the notes thereto and
except with respect to unaudited statements) and fairly present (subject, in the
case  of the  unaudited  interim  financial  statements,  to  normal,  recurring
year-end audit adjustments (which are not expected to be, individually or in the
aggregate,  materially adverse to Parent and its consolidated Subsidiaries)) the
consolidated  financial position of Parent and its consolidated  Subsidiaries as
at the respective dates thereof and the consolidated results of their operations
and cash  flows  for the  respective  periods  then  ended.  The  related  notes
reconciling  to United States  generally  accepted  accounting  principles  such
consolidated  financial  statements  comply in all  material  respects  with the
requirements of the SEC applicable to such reconciliation.

          Section  5.6 Absence of Certain Changes or Events. Except as disclosed
in the Parent SEC Reports filed prior to the date hereof,  or Section 5.6 of the
Parent  Disclosure  Letter,  (a) since June 30,  1999 there has not been (i) any
change,  event or development  having,  or that could  reasonably be expected to
have,  individually  or in the aggregate,  a Parent  Material  Adverse Effect or
which could  reasonably be expected to prevent,  hinder or materially  delay the
ability of Parent to consummate the Merger;  (ii) any material  change by Parent
or any of its Material  Subsidiaries  in its accounting  methods,  principles or
practices;  (iii) any damage,  destruction or loss which, individually or in the
aggregate, resulted in or could be reasonably expected to have a Parent Material
Adverse  Effect;  or (iv)  any  event  pursuant  to which  Parent  or any of its
Subsidiaries  has incurred  any  material  liabilities  (direct,  contingent  or
otherwise) or engaged in any material  transaction  or entered into any material
agreement,  in each  case,  outside  the  ordinary  course  of  business  which,
individually or in the aggregate,  could be reasonably expected to have a Parent
Material  Adverse  Effect,  and (b) between  June 30, 1999 and the date  hereof,
Parent and its Material  Subsidiaries have conducted their respective businesses
only in the ordinary course substantially consistent with past practice.

          Section  5.7 Absence of  Undisclosed  Liabilities.  Except for matters
reflected  or reserved  against in the  balance  sheet as at June 30, 1999 or as
disclosed in Section 5.7 of the Parent Disclosure Letter, neither Parent nor any
of its  Subsidiaries  had at such date,  or has  incurred  since that date,  any
liabilities or obligations  (whether  absolute,  accrued,  contingent,  fixed or
otherwise, or whether due or to become due) of any nature that would be required
by  generally  accepted  accounting  principles  in  the  United  Kingdom  to be
reflected  on a  consolidated  balance  sheet  of  Parent  and its  consolidated
subsidiaries  (including the notes thereto),  except  liabilities or obligations
(i) which were incurred in the ordinary course of business  consistent with past
practice or (ii) which have not been,  and could not  reasonably  be expected to
have, individually or in the aggregate, a Parent Material Adverse Effect.

          Section  5.8 Legal Proceedings.  Except as disclosed in the Parent SEC
Reports  filed  prior  to the  date  hereof  or in  Section  5.8  of the  Parent
Disclosure Letter, (i) there are no actions, suits,  arbitrations or proceedings
pending  or,  to the  knowledge  of  Parent,  threatened  against,  nor,  to the
knowledge  of  Parent,  are  there  any  Governmental  or  Regulatory  Authority
investigations  or audits  pending or  threatened  against  Parent or any of its
Subsidiaries or any of its assets and properties  which,  individually or in the
aggregate, could reasonably be expected to have a Parent Material Adverse Effect
or  prevent,  materially  impair or  materially  delay the ability of Parent and
Merger Sub to consummate the  transactions  contemplated by this Agreement,  and
(ii) neither Parent nor any of its  Subsidiaries  is subject to any order of any
Governmental or Regulatory Authority which, individually or in the aggregate, is
having or could  reasonably be expected to have a Parent Material Adverse Effect
on Parent or  prevent,  materially  impair or  materially  delay the  ability of
Parent  and Merger  Sub to  consummate  the  transactions  contemplated  by this
Agreement.

          Section  5.9 Information Supplied.  (a) The registration  statement on
Form F-4 ("Form F-4") to be filed with the SEC by Parent in connection  with the
issuance of Parent Ordinary Shares and Parent ADSs in the Merger,  as amended or
supplemented   from  time  to  time  (as  so  amended  and   supplemented,   the
"Registration  Statement"),  and any other  documents to be filed by Parent with
the SEC or any other Governmental or Regulatory Authority in connection with the
Merger and the other transactions  contemplated  hereby will (in the case of the
Registration Statement and any such other documents filed with the SEC under the
Securities Act or the Exchange Act) comply as to form, in all material respects,
with the requirements of the Exchange Act and the Securities Act,  respectively,
and will not,  on the date of its  filing  or,  in the case of the  Registration
Statement,  at the time it becomes effective under the Securities Act, or at the
date the Proxy  Statement  is mailed to  stockholders  of the Company and at the
time of the Company  Stockholders'  Meeting,  contain any untrue  statement of a
material fact or omit to state any material  fact required to be stated  therein
or  necessary  in  order  to  make  the  statements  therein,  in  light  of the
circumstances under which they are made, not misleading;  provided,  however, no
representation  is made by Parent  or Merger  Sub with  respect  to  information
supplied  in  writing by or on behalf of the  Company  expressly  for  inclusion
therein and information  incorporated by reference  therein from documents filed
by the Company or any of its Subsidiaries with the SEC.

          (b) The Parent  Disclosure  Documents  will,  at all  relevant  times,
include  all  information  relating  to  Parent  and its  Subsidiaries  which is
required to enable the Parent  Disclosure  Documents  and the parties  hereto to
comply in all material  respects  with all United  Kingdom  statutory  and other
legal and regulatory provisions  (including,  without limitation,  the Companies
Act, the FSA and the rules and regulations  made  thereunder,  and the rules and
requirements  of the LSE) and all such  information  contained in such documents
will be  substantially  in accordance  with the facts and will not omit anything
material likely to affect the import of such information.

          (c) Notwithstanding  the foregoing  provisions of this Section 5.9, no
representation  or warranty is made by Parent with respect to statements made or
incorporated by reference in the Registration Statement, the Listing Particulars
or the  Circular  based on  information  supplied by the Company  expressly  for
inclusion or incorporation by reference therein or based on information which is
not made in or incorporated by reference in such documents but which should have
been disclosed pursuant to Section 4.6.

          Section  5.10 Permits; Compliance with Laws and Orders. Parent and its
Subsidiaries  hold all permits,  licenses,  franchises,  variances,  exemptions,
orders and approvals of all  Governmental and Regulatory  Authorities  necessary
for the lawful conduct of their  respective  businesses (the "Parent  Permits"),
except for failures to hold such Parent  Permits which,  individually  or in the
aggregate,  are not having and could not reasonably be expected to have a Parent
Material Adverse Effect.  Parent and its Subsidiaries are in compliance with the
terms of the Parent Permits, except failures so to comply which, individually or
in the  aggregate,  could not  reasonably be expected to have a Parent  Material
Adverse Effect. Except as disclosed in the Parent SEC Reports filed prior to the
date hereof,  neither Parent nor its Subsidiaries are in violation of or default
under any law or order of any Governmental or Regulatory  Authority,  except for
such violations or defaults which,  individually or in the aggregate,  could not
reasonably be expected to have a Parent Material Adverse Effect.

          Section  5.11  Compliance with  Agreements  Except as disclosed in the
Parent SEC Reports  filed prior to the date hereof or Section 5.11 of the Parent
Disclosure  Letter,  neither Parent nor any of its  Subsidiaries is in breach or
violation  of, or in default in the  performance  or  observance  of any term or
provision of, and no event has occurred  which,  with notice or lapse of time or
both,  could  reasonably  be  expected  to result in a  default  under,  (i) the
memorandum or articles of association (or other comparable charter documents) of
Parent or any of its material  Subsidiaries or (ii) any Contract to which Parent
or  any  of  its  Subsidiaries  is a  party  or by  which  Parent  or any of its
Subsidiaries or any of its assets or properties is bound,  except in the case of
clause (ii) for breaches,  violations and defaults which, individually or in the
aggregate,  are not having and could not reasonably be expected to have a Parent
Material Adverse Effect.

          Section  5.12  Vote  Required.  The only  votes of the  holders of any
class of  shares  of  Parent  required  to  approve  the  Merger  and the  other
transactions  contemplated  hereby is the affirmative vote of a majority of such
ordinary  shareholders  of Parent as (being  entitled  to do so) are present and
vote  (or,  in the  case of a vote  taken  on a poll,  the  affirmative  vote by
shareholders  or their proxies  representing  a majority of the Parent  Ordinary
Shares  in  respect  of  which  votes  were  validly  exercised)  at the  Parent
Shareholders Meeting in relation to the approval of the Merger.

          Section  5.13   Contracts.  Except as set forth in Section 5.13 of the
Parent Disclosure Letter,  neither Parent nor its Subsidiaries is a party to, or
has any obligation under, any Contract which contains any covenant  currently or
prospectively  limiting  the  freedom  of Parent or any of its  Subsidiaries  to
engage in any line of  business  or to compete  with any  entity,  except to the
extent  such  limitations  could not  reasonably  be  expected  to have a Parent
Material  Adverse  Effect.  All Contracts to which Parent or any of its Material
Subsidiaries is a party or by which any of their respective  assets is bound are
valid and binding,  in full force and effect and enforceable against the parties
thereto in accordance with their respective  terms,  other than such failures to
be so valid and binding, in full force and effect or enforceable which could not
reasonably  be expected to have,  either  individually  or in the  aggregate,  a
Parent  Material  Adverse  Effect.  There is not  under  any such  Contract  any
existing  default or event which,  after notice or lapse of time, or both, would
constitute  a  default  by  Parent or any of its  Material  Subsidiaries  or, to
Parent's knowledge, any other party, except to the extent such default could not
reasonably be expected to have a Parent Material Adverse Effect.

          Section  5.14   Taxes.  Parent and each  Material  Subsidiary  (i) has
timely filed or will timely file all  material Tax Returns  required to be filed
on or before the Effective Time, which returns are and will be true and complete
in all  material  respects;  and (ii) Parent and each  Material  Subsidiary  has
timely paid or has adequately  disclosed,  and fully provided for as a liability
accrual on the Company  Financial  Statements in accordance  with United Kingdom
generally accepted accounting principles,  consistently applied, all Taxes which
are due and payable with respect to all taxable  years or periods that end on or
before the date of this  Agreement.  Parent  and each  Material  Subsidiary  has
withheld or collected all Taxes they were required to withhold and collect,  and
have timely paid to the proper  authorities  such Taxes withheld or collected to
the extent due and payable.

          Section  5.15  Year 2000.  Except as set forth in Section  5.15 of the
Parent  Disclosure  Letter and  except as would not result in a Parent  Material
Adverse  Effect,  to the  knowledge  of Parent,  all  software  material  to the
business, finances or operations of Parent ("Software"):

                  (i) shall accurately and completely process (including but not
         limited to  calculation,  comparison  and  sequencing,  and  including,
         without limitation, leap year calculations) date-related data for dates
         prior to the year  2000,  date-related  data for  dates  after the year
         1999,  and  date-related  data for dates both  before the year 2000 and
         after the year 1999; and

                  (ii) shall not, as a consequence of the change of centuries or
         of the fact that dates from more than one century are being  processed,
         cause an abnormal termination of execution,  an endless loop, incorrect
         values or invalid results,  or otherwise fail to perform accurately and
         completely   those   functions  set  forth  in  the   associated   user
         documentation.

          Section  5.16  Ownership of Company  Common Stock.  Neither Parent nor
any of its  Subsidiaries  or other  affiliates  beneficially  owns any shares of
Company Common Stock other than pursuant to the Stockholders Agreements.

          Section  5.17 Business of Merger Sub. Merger Sub was organized  solely
for the  purpose of  acquiring  the Company  and  engaging  in the  transactions
contemplated  by this Agreement and has not engaged in any business since it was
incorporated  which is not in connection with the acquisition of the Company and
this  Agreement.  During the period from the date of this Agreement  through the
Effective  Time,  Merger  Sub shall not engage in any  activities  of any nature
except as provided in or contemplated by this Agreement.

          Section  5.18 Brokers. No broker, investment banker or other person or
entity,  other than Warburg Dillon Read LLC, the fees and expenses of which will
be paid by Parent, is entitled to any broker's, finder's or other similar fee or
commission in connection  with the  transactions  contemplated by this Agreement
based upon arrangements made by or on behalf of Parent or Merger Sub.

                                  ARTICLE VI

                    COVENANTS RELATING TO CONDUCT OF BUSINESS

          Section   6.1  Conduct of Business by the Company  Pending the Merger.
Except as otherwise expressly  contemplated by this Agreement or as described in
the Company Disclosure Letter, during the period from the date of this Agreement
through the Effective Time, the Company shall,  and shall cause its Subsidiaries
to carry on their  respective  businesses  in the regular and  ordinary  course,
preserve  intact  their  current  business  organizations,  and,  to the  extent
consistent  therewith,  use its commercially  reasonable efforts, keep available
the  services  of their  current  officers  and  employees  and  preserve  their
relationships with customers, suppliers and others having business dealings with
them. Without limiting the generality of the foregoing, and, except as otherwise
expressly  contemplated  by this Agreement or as described in Section 6.1 of the
Company  Disclosure  Letter,  during the period from the date of this  Agreement
through the Effective  Time,  the Company shall not, and shall not permit any of
its Subsidiaries to, without the prior written consent of Parent:

               (a) (x) declare,  set aside or pay any  dividends on, or make any
          other actual,  constructive or deemed distributions in respect of, any
          of its capital stock,  or otherwise make any payments to  stockholders
          of the Company in their capacity as such, other than dividends payable
          to the Company  declared  by any of the  Company's  Subsidiaries,  (y)
          split,  combine or  reclassify  any of its  capital  stock or issue or
          authorize the issuance of any other  securities in respect of, in lieu
          of or in substitution for shares of its capital stock or (z) purchase,
          redeem or otherwise acquire any shares of capital stock of the Company
          or any of its  Subsidiaries  or any other  securities  thereof  or any
          rights,  warrants  or  options  to  acquire  any such  shares or other
          securities;

               (b)  issue,  deliver,  sell,  pledge,  dispose  of  or  otherwise
          encumber any shares of its capital stock, any other voting  securities
          or  equity   equivalent  or  any   securities   convertible   into  or
          exchangeable or exercisable for, or any rights, warrants or options to
          acquire, any such shares, voting securities or convertible  securities
          or equity  equivalent  (other than,  in the case of the  Company,  the
          issuance of Company  Common  Stock  during the period from the date of
          this  Agreement  through the Effective Time upon the exercise of Stock
          Options  outstanding  (as set forth in Section  4.2(a)) on the date of
          this  Agreement in accordance  with their current terms) or enter into
          any  agreement or contract with respect to the sale or issuance of any
          of its securities;

               (c) amend its certificate of incorporation or bylaws or amend the
          certificate  of  incorporation  and by-laws  (or other  organizational
          documents) of any of its Subsidiaries;

               (d) acquire or agree to acquire by merging or consolidating with,
          or by purchasing  assets of or equity in, or by any other manner,  any
          business  or  any  corporation,   partnership,  association  or  other
          business  organization  or division  thereof or  otherwise  acquire or
          agree to acquire  any assets  (other  than in the  ordinary  course of
          business consistent with past practice);

               (e) sell,  lease or otherwise  dispose of or agree to sell, lease
          or  otherwise  dispose  of,  any  of its  assets  that  are  material,
          individually or in the aggregate,  to the Company and its Subsidiaries
          taken as a whole;

               (f) incur any  indebtedness  for borrowed  money or guarantee any
          such  indebtedness  or issue or sell any debt  securities or guarantee
          any debt securities of others, except for (i) borrowings or guarantees
          incurred  in the  ordinary  course of  business  consistent  with past
          practice  for  working  capital  purposes,  (ii)  indebtedness  of any
          Subsidiary  of the Company to the Company or to another  Subsidiary of
          the Company,  (iii) in  replacement  for existing or maturing  debt so
          long as principal  amount does not  increase or (iv) other  borrowings
          under  existing  lines of  credit or loans in the  ordinary  course of
          business consistent with past practice, or make any loans, advances or
          capital  contributions  to, or  investments  in,  any other  person or
          entity,  other than to the Company or any wholly owned  Subsidiary  of
          the  Company  and  other  than  in the  ordinary  course  of  business
          consistent with past practice;

               (g)   alter   through   merger,   liquidation,    reorganization,
          restructuring  or in any other  fashion  the  corporate  structure  or
          ownership  of any  Subsidiary  of the  Company  or adopt any plan with
          respect to any of the foregoing;

               (h) grant any severance or termination pay not currently required
          to be paid under existing severance plans or agreements, enter into or
          adopt, or amend any existing, severance plan, agreement or arrangement
          or,  other than in the  ordinary  course of business or as required by
          applicable  law,  enter  into  or  amend  any  employee  benefit  plan
          (including, without limitation, the Company Stock Plan), or enter into
          or amend any employment or consulting agreement;

               (i) enter into any contract or commitment with respect to capital
          expenditures  with a value in excess of, or requiring  expenditures by
          the Company and its Subsidiaries in excess of $100,000,  individually,
          or enter  into  contracts  or  commitments  with  respect  to  capital
          expenditures  with a value in excess of, or requiring  expenditures by
          the  Company  and its  Subsidiaries  in excess of  $1,000,000,  in the
          aggregate;

               (j) except to the extent  required  under  existing  employee and
          director benefit plans, agreements or arrangements as in effect on the
          date of this  Agreement,  make any bonus  payments to, or increase the
          compensation or fringe  benefits of any of its directors,  officers or
          employees,  provided that,  the Company may (i) increase  compensation
          associated  with promotions and regular reviews in the ordinary course
          of business  consistent with past practice and (ii) pay bonuses in the
          ordinary course of business  consistent with past practice;  provided,
          however,  that the  aggregate  amount of such payments with respect to
          the employees of the Company's  United  States  operations  other than
          Falk Communications, Inc., shall not exceed $1,000,0000;

               (k) agree to the settlement of any material claim or litigation;

               (l) make or  rescind  any  material  tax  election  or  settle or
          compromise any material tax liability;

               (m) make any material change in its method of accounting;

               (n)  except as  required  under  the  Company  Stock  Plan and as
          otherwise provided in this Agreement, accelerate the payment, right to
          payment  or  vesting  of  any  bonus,   severance,   profit   sharing,
          retirement,  deferred compensation,  stock option,  insurance or other
          compensation or benefits;

               (o)  pay,  discharge  or  satisfy  any  claims,   liabilities  or
          obligations (absolute, accrued, asserted or unasserted,  contingent or
          otherwise),  other than the payment,  discharge or satisfaction (A) of
          any such claims,  liabilities or obligations in the ordinary course of
          business  and  consistent   with  past  practice  or  (B)  of  claims,
          liabilities  or  obligations  reflected  or  reserved  against  in, or
          contemplated by, the consolidated  financial  statements (or the notes
          thereto) contained in the Company SEC Reports;

               (p) enter into any agreement,  understanding  or commitment  that
          restrains, limits or impedes the Company's or any of its Subsidiaries'
          ability to compete  with or conduct any  business or line of business,
          including, but not limited to, geographic limitations on the Company's
          or any of its Subsidiaries' activities;

               (q) materially  modify,  amend or terminate any material contract
          to which it is a party or waive any of its  material  rights or claims
          except  in the  ordinary  course  of  business  consistent  with  past
          practice; or

               (r) agree, in writing or otherwise,  to take any of the foregoing
          actions.

          Section  6.2  No  Solicitation.  (a) During  the period  from the date
hereof  through  the  Effective  Time,  neither  the  Company  nor  any  of  its
Subsidiaries  shall,  directly or  indirectly,  take (and the Company  shall not
authorize or permit its, or its Subsidiaries',  officers, directors,  employees,
financial  advisors,  attorneys and other advisors,  representatives and agents)
any action to (i) solicit, facilitate,  initiate or encourage the submission of,
any Takeover Proposal (as hereafter defined) (including, without limitation, the
taking of any  action  which  would make  Section  203 of the  Delaware  General
Corporation inapplicable to a Takeover Proposal),  (ii) enter into any agreement
with  respect  to  any  Takeover   Proposal  or  enter  into  any   arrangement,
understanding  or  agreement  requiring  it to  abandon,  terminate  or  fail to
consummate the Merger or any other  transaction  contemplated by this Agreement,
(iii) unless the Board of Directors of the Company, based upon the advice of its
outside  counsel,  determines in good faith that the failure to take such action
would  result  in a  breach  of  its  fiduciary  duties  under  applicable  law,
participate in any way in any discussions or negotiations  regarding, or furnish
to any person or legal entity (other than Parent or Merger Sub) any  information
with  respect  to any  Takeover  Proposal  or (iv)  take  any  other  action  to
facilitate any inquiries or the making of any proposal that constitutes,  or may
reasonably be expected to lead to, any Takeover  Proposal.  "Takeover  Proposal"
shall mean any  proposed  merger or other  business  combination,  sale or other
disposition of any material  amount of assets,  sale of shares of capital stock,
tender offer or exchange offer or similar transactions  involving the Company or
any of its Subsidiaries.

          (b) During the period from the date hereof through the Effective Time,
neither the Board of Directors of the Company nor any  committee  thereof  shall
(i) unless the Board of Directors  of the Company,  based upon the advice of its
outside  counsel,  determines in good faith that the failure to take such action
would result in a breach of its fiduciary duties under applicable law,  withdraw
or modify,  or propose to withdraw or modify,  in a manner  adverse to Parent or
Merger Sub,  the approval or  recommendation  by such Board of Directors or such
committee  of the Merger and this  Agreement or (ii)  approve or  recommend,  or
propose  to approve or  recommend,  any  Takeover  Proposal  or (iii)  cause the
Company to enter into any letter of intent, agreement in principle,  acquisition
agreement or other similar agreement related to any Takeover Proposal.

          (c) In  addition  to the  obligations  of the  Company  set  forth  in
paragraphs (a) and (b) of this Section 6.2, on the date of receipt  thereof,  if
possible, but no later than twelve (12) hours after receipt thereof, the Company
shall advise  Parent in writing of any request for  information  or any Takeover
Proposal, or any inquiry,  proposal,  discussions or negotiation with respect to
any  Takeover  Proposal,  the terms and  conditions  of such  request,  Takeover
Proposal,  inquiry or proposal and the Company shall promptly  provide to Parent
copies of any written  materials  received by the Company in connection with any
of the  foregoing,  and the  identity  of the  person or entity  making any such
Takeover Proposal or such request, inquiry or proposal.

          (d) Immediately following the execution of this Agreement, the Company
will cease any existing  discussions or negotiations  with any parties conducted
heretofore  with respect to any Takeover  Proposal and request each person which
has  heretofore  executed a  confidentiality  agreement in  connection  with its
consideration  of  acquiring  the Company or any  portion  thereof to return all
confidential  information heretofore furnished to such person or entity by or on
behalf of the Company.

          Section 6.3  Third Party Standstill Agreements. During the period from
the date of this Agreement through the Effective Time, (i) the Company shall not
terminate,  amend,  modify  or waive any  provision  of any  confidentiality  or
standstill  agreement to which the Company or any of its Subsidiaries is a party
(other than any involving  Parent),  and (ii) the Company shall enforce,  to the
fullest  extent  permitted  under  applicable  law, the  provisions  of any such
agreements, including, but not limited to, where necessary obtaining injunctions
to prevent any breaches of such agreements and to enforce specifically the terms
and  provisions  thereof in any court of the United  States or any state thereof
having jurisdiction.


                                   ARTICLE VII

                              ADDITIONAL AGREEMENTS

          Section  7.1 Access to  Information.  Each of the parties  shall,  and
shall cause each of their  Subsidiaries  to,  afford to the other party,  and to
other   party's   accountants,    counsel,    financial   advisers   and   other
representatives,  reasonable  access  and permit  them to make such  inspections
during normal  business hours as they may  reasonably  request during the period
from  the  date  of this  Agreement  through  the  Effective  Time to all  their
respective  properties,  books,  contracts,  commitments and records and, during
such period, each of the parties shall, and shall cause each of its Subsidiaries
to,  furnish  promptly to the other party (i) a copy of each  report,  schedule,
registration  statement  and  other  document  filed by it  during  such  period
pursuant to the  requirements of U.K.,  federal or state laws and (ii) all other
information  concerning its business,  properties,  clients and personnel as the
other party may reasonably request.

          Section   7.2   Preparation  of   Registration   Statement  and  Proxy
Statement. As soon as practicable after the date of this Agreement,  the Company
shall, in cooperation with Parent, prepare the Proxy Statement and Parent shall,
in cooperation with the Company,  prepare the Registration  Statement,  in which
the Proxy  Statement will be included as the  prospectus.  The Company shall, in
cooperation  with  Parent,  file  the  Proxy  Statement  with  the  SEC  as  its
preliminary  Proxy Statement and Parent shall, in cooperation  with the Company,
prepare  and file  with the SEC the  Registration  Statement  in which the Proxy
Statement will be included as the  prospectus.  Parent and the Company shall use
commercially  reasonable  efforts to have the  Registration  Statement  declared
effective by the SEC as promptly as  practicable  after such filing.  Parent and
the  Company  shall also take any action  (other  than  qualifying  as a foreign
corporation or taking any action which would subject it to service of process in
any jurisdiction where Parent is not now so qualified or subject) required to be
taken under  applicable state blue sky or securities laws in connection with the
issuance of Parent ADSs or Parent Ordinary Shares in connection with the Merger.
If at any time prior to the Effective  Time any event shall occur that should be
set forth in an  amendment  of or a supplement  to the  Registration  Statement,
Parent shall prepare and file with the SEC such  amendment or supplement as soon
thereafter as is reasonably practicable.  Parent and the Company shall cooperate
with the other party in the  preparation of the  Registration  Statement and the
Proxy Statement and any amendment or supplement  thereto,  and each shall notify
the other  party of the receipt of any  comments of the SEC with  respect to the
Registration Statement or the Proxy Statement and of any requests by the SEC for
any amendment or supplement  thereto or for  additional  information,  and shall
provide to the other party promptly copies of all correspondence  between Parent
or the Company,  as the case may be, or any of their respective  representatives
with respect to the Registration  Statement or the Proxy  Statement.  Parent and
the  Company  shall  give the  other  party  and their  respective  counsel  the
opportunity to review the Registration Statement and the Proxy Statement and all
responses to requests for  additional  information by and replies to comments of
the SEC before there being filed with,  or sent to, the SEC. Each of the Company
and Parent agrees to use commercially  reasonable  efforts,  after  consultation
with each other,  to respond  promptly to all such  comments of, and requests by
the SEC and to cause (x) the Registration Statement to be declared effective by,
the SEC at the earliest  practicable time and to be kept effective as long as is
necessary to consummate the Merger,  and (y) the Proxy Statement to be mailed to
the  holders  of  Company   Common  Stock   entitled  to  vote  at  the  Company
Stockholder's Meeting at the earliest practicable time.

          Section  7.3 Approval Of Shareholders.  (a) Parent shall,  through its
Board  of  Directors  ,  duly  call,   give  notice  of,  convene  and  hold  an
extraordinary  general meeting of its  shareholders  (the "Parent  Shareholders'
Meeting"),  for the purpose of voting to approve the Merger in  accordance  with
this Agreement and any resolutions  necessary or appropriate to enable Parent to
implement the same (the "Parent  Shareholders'  Approval").  Unless the Board of
Directors of Parent, based upon the advice of their outside counsel,  determines
in good faith that making such  recommendation,  or failing to amend,  modify or
withdraw  any  previously  made  recommendation,  would result in a breach their
fiduciary  duties to shareholders  under applicable law, Parent shall include in
the  Circular  the  recommendation  of the Board of Directors of Parent that the
shareholders  of Parent  approve such  matters,  and shall use its  commercially
reasonable  efforts  to obtain  such  approval.  In  connection  with the Parent
Shareholders'  Meeting,  subject to applicable law, (i) Parent shall, as soon as
practicable  after the date of this Agreement and in accordance with the listing
rules of the LSE,  prepare and submit to the LSE for  approval  the Circular and
Listing Particulars,  and shall use its commercially  reasonable efforts to have
such documents  formally  approved by the LSE and shall  thereafter  publish the
Circular  and the Listing  Particulars  and  dispatch  the  Circular and Listing
Particulars  to its  shareholders  in  compliance  with all  legal  requirements
applicable to the Parent Shareholders'  Meeting and the listing rules of the LSE
and  (ii) if  necessary  thereafter,  promptly  publish  or  circulate  amended,
supplemental or supplemented materials and, if required in connection therewith,
resolicit  votes.  Parent shall give the Company and its counsel the opportunity
to  review  the  Circular  and the  Listing  Particulars  before  the  same  are
published. The Company agrees to cooperate with Parent in the preparation of the
Circular and the Listing  Particulars  including providing such information with
respect to the Company and its  Subsidiaries  as may be required to be disclosed
therein.

          (b) The Company shall, through its Board of Directors, duly call, give
notice  of,  convene  and  hold a  meeting  of its  stockholders  (the  "Company
Stockholders'  Meeting") for the purpose of voting on the approval of the Merger
in accordance with this Agreement (the "Company Stockholders' Approval") as soon
as reasonably  practicable after the date hereof. The Company shall, through its
Board of Directors, unless the Board of Directors of the Company, based upon the
advice of its outside counsel,  determines in good faith that the taking of such
action would result in a breach of its fiduciary duties under applicable law (i)
include in the Proxy Statement the  recommendation  of the Board of Directors of
the Company that the stockholders of the Company approve such matters,  and (ii)
use its  commercially  reasonable  efforts to obtain such approval.  The Company
shall consult and discuss in good faith with Parent  regarding the  alternatives
available for obtaining the Company Stockholders' Approval.

          Section   7.4 Company  Affiliates.  At least thirty (30) days prior to
the Closing Date the Company  shall deliver a letter to Parent  identifying  all
persons  who,  at the time of the  Company  Stockholder's  Meeting,  may, in the
Company's  reasonable  judgment,  be deemed to be "Affiliates"  (as such term is
used  in  Rule  145  under  the  Securities   Act)  of  the  Company   ("Company
Affiliates").  The Company shall use  commercially  reasonable  efforts to cause
each  Company  Affiliate  to deliver to Parent on or prior to the Closing Date a
written  agreement  substantially in the form of Exhibit 1 hereto (an "Affiliate
Agreement").  Parent  shall be entitled to place  legends as  specified  in such
Affiliate  Agreements on the certificates  evidencing any Parent Ordinary Shares
or Parent ADSs to be received by such Company Affiliates parties to an Affiliate
Agreement pursuant to the terms of this Agreement, and to issue appropriate stop
transfer instructions to the transfer agent for the Parent ADSs, consistent with
the terms of such Affiliate Agreements.

          Section  7.5 Auditors'  Letters.  Each of the Company and Parent shall
use its  commercially  reasonable  efforts to cause to be delivered to the other
party and such other  party's  Board of  Directors  a letter of its  independent
auditors,  dated  the date on which  the  Registration  Statement  shall  become
effective,  and  addressed  to the other party and such other  party's  Board of
Directors,  in form and substance  customary for "comfort"  letters delivered by
independent public accountants in connection with the registration statements on
Form F-4.

          Section 7.6  Stock Exchange Listing. Parent shall use its commercially
reasonable efforts, and the Company shall cooperate in respect thereto, to cause
(a) the Parent  Ordinary  Shares and Parent  ADSs to be issued in the Merger and
under the Company Stock Plan after the Merger in accordance  with this Agreement
to be approved for listing on the NYSE,  subject to official notice of issuance,
prior to the Closing Date;  (b) the Parent  Ordinary  Shares to be issued in the
Merger  (including  those Parent Ordinary Shares to be represented by the Parent
ADSs to be issued in the  Merger) to be  admitted  to the  Official  List of the
London Stock Exchange at the Effective Time and (c) the Parent  Ordinary  Shares
to be issued under the Company  Stock Plan after the Merger in  accordance  with
this Agreement to be admitted to the Official List of the London Stock Exchange,
at the time of issue.

          Section  7.7 Fees and Expenses.  (a) Subject to Section 7.7(b) Whether
or not the Merger is consummated,  all costs and expenses incurred in connection
with this Agreement and the  transactions  contemplated  hereby shall be paid by
the party incurring such costs and expenses,  except as otherwise  expressly set
forth in this Agreement; provided, however, the costs of any HSR Act filing made
by Steven Girgenti or William Leslie Milton, in each case, as may be required in
connection with the Merger shall be paid by the Company.

          (b) In the event that this  Agreement is terminated  and the Merger is
not  consummated  solely as a result of the  failure  of Parent to  receive  the
Parent  Shareholders'  Approval,  Parent shall pay to the Company all documented
reasonable  out of  pocket  costs and  expenses  (including  legal,  accounting,
investment  banking and other professional fees) incurred by the Company and its
Subsidiaries  primarily  relating  to  the  transactions  contemplated  by  this
Agreement,  which  amounts  shall be due and payable  within 10 business days of
such  termination;  provided,  however,  that in no event  shall  the  aggregate
obligation of Parent to pay such fees and expenses exceed $1.5 million.

          Section   7.8  Commercially  Reasonable  Efforts.  Upon the  terms and
subject  to the  conditions  set forth in this  Agreement,  each of the  parties
agrees to use its commercially reasonable efforts to take, or cause to be taken,
all actions,  and to do, or cause to be done,  and to assist and cooperate  with
the  other  party in  doing,  all  things  necessary,  proper  or  advisable  to
consummate and make effective,  in the most expeditious manner practicable,  the
Merger, and the other transactions contemplated by this Agreement, including (a)
obtaining all necessary actions or non-actions,  waivers, consents and approvals
from  Governmental  Entities and the making of all necessary  registrations  and
filings  (including  filings  with  Governmental  Entities,   including  without
limitation,  all  filings  under the HSR Act) and the  taking of all  reasonable
steps as may be  necessary  to obtain an  approval or waiver from or to avoid an
action or proceeding  by any  Governmental  Entity,  (b) obtaining all necessary
consents, approvals or waivers from third parties, (c) defending any lawsuits or
other legal proceedings,  whether judicial or  administrative,  challenging this
Agreement or the consummation of the transactions contemplated hereby, including
seeking to have any stay or temporary  restraining order entered by any court or
other Governmental Entity vacated or reversed,  and (d) executing and delivering
any additional instruments necessary to consummate the transactions contemplated
by this Agreement.

          Section  7.9 Public  Announcements.  Parent,  on the one hand, and the
Company,  on the other hand,  will consult  with each other  before  issuing any
press  release or  otherwise  making any public  statements  with respect to the
transactions  contemplated by this Agreement, and shall not issue any such press
release or make any such public statement prior to such consultation,  except as
may be required by applicable law or regulation.

          Section  7.10 Indemnification;  Directors and Officers Insurance.  (a)
From and after the Effective  Time and  continuing for a period of not less than
six  years  after  the  Effective  Time ,  Parent  agrees  to,  and to cause the
Surviving  Corporation  to,  indemnify  and hold  harmless  all past and present
officers, directors, employees and agents of the Company and of its Subsidiaries
to the full extent such persons have been indemnified by the Company pursuant to
the Company's  Certificate  of  Incorporation  and Bylaws as in effect as of the
date hereof for acts and omissions  occurring at or prior to the Effective  Time
and shall  advance  reasonable  expenses  incurred by such persons in connection
with defending any action  arising out of such acts or omissions,  provided that
the Company receives reasonable  affirmations and undertakings from such persons
to repay all amounts  advanced if it should be ultimately  determined  that such
person was not entitled to  indemnification.  The parties  hereto agree that the
officers,  directors,  employees and agents of the Company and its  Subsidiaries
covered by such  indemnification  are intended to be  third-party  beneficiaries
under this Section 7.10 and shall have the right to enforce the  obligations  of
Parent and the Surviving Corporation under this Section 7.10.

          (b)  Parent  will  provide,  or cause  the  Surviving  Corporation  to
provide,  for a period of not less than six years after the Effective  Time, for
the benefit of the Company's  current  directors and officers,  an insurance and
indemnification  policy that provides  coverage for events occurring at or prior
to the Effective Time that is no less favorable than the existing  policy or, if
substantially  equivalent insurance coverage is unavailable,  the best available
coverage; provided, however, that Parent and the Surviving Corporation shall not
be required to pay an annual  premium for such insurance in excess of 1.50 times
the last annual  premium paid prior to the date  hereof,  but in such case shall
purchase as much such coverage as possible for such amount.

          Section  7.11 Compliance with Treasury Regulations.  In order to avoid
the  application  of Section  367(a)(1) of the Code,  after the Effective  Time,
Parent agrees to take all steps  required to ensure that the Company will comply
with the reporting  requirements  described in U.S. Treasury Regulations Section
1.367(a)-3(c)(6).  Parent  also  agrees to provide to the  Company and any other
person  that is a  holder  of  Company  Common  Stock  immediately  prior to the
Effective  Time that may have reporting  obligations  under Section 6038B of the
Code with respect to any transactions  effected pursuant to this Agreement,  any
information  necessary to comply with the filing  requirements  of Section 6038B
and the U.S. Treasury Regulations promulgated thereunder.

          Section  7.12 No Transfer of Stock. Prior to December 31, 2005, Parent
will neither  transfer,  sell or otherwise dispose of any shares of stock of the
Company, other than a transfer to a Subsidiary or an Affiliate of Parent so long
as such transfer is described in Treasury Regulations Section  1.367(a)-(8(g)(2)
and Parent provides the Shareholder Parties (as defined below) within 15 days of
such transfer with the information  necessary to comply with the requirements of
Treasury  Regulation Sections  1.367(a)-8(g)(2)(ii)  through (iv) , nor permit a
"deemed  disposition"  of  any  such  shares  within  the  meaning  of  Treasury
Regulations Section 1.367(a)-8(e)(3).  Parent agrees to report the breach of any
covenant of this  Section  7.12 to any holder of shares of Company  Common Stock
that,  solely as a result of the  receipt  of the  Merger  Consideration  at the
Effective  Time,  becomes the  beneficial  owner of 5% or more of Parent  Shares
(collectively, the "Shareholder Parties") within 15 days of such breach.

          Section  7.13   Dividends,  Distributions  and  Issuances.  During the
period from the date of this Agreement  through the Effective Time, Parent shall
not (i)  declare,  set  aside  or pay  any  dividends  on,  or  make  any  other
distributions  in respect of, any of its capital stock,  except for dividends on
Parent  Ordinary  Shares,  (ii) split,  combine or reclassify or otherwise alter
Parent  Ordinary  Shares,  or (iii) issue or authorize the issuance of any other
securities  in  respect  of,  in lieu of or in  substitution  for  shares of its
capital stock.

          Section  7.14 Section 103 CA 1985.  Parent shall use its  commercially
reasonable efforts and the Company shall cooperate in respect thereto,  to cause
(to the extent applicable):

          (a) the appointment of an appropriate independent person (who would be
qualified  to be the  auditor of Parent)  to produce a  valuation  and report in
accordance with Section 103 of the Companies Act 1985;

          (b) the appointed independent valuer to produce a report in accordance
with Section 108 of the Companies Act 1985 as soon as practicable  following the
date of this Agreement;

          (c) the  appointed  independent  valuer's  valuation  and report to be
circulated to the board of directors of the Company for their review and comment
as soon as practicable after an initial draft is produced to Parent;

          (d) the independent  valuation and report to be sent to all holders of
the Company Common Stock along with the Proxy Statement.

                                  ARTICLE VIII

                              CONDITIONS PRECEDENT

          Section   8.1  Conditions  to Each  Party's  Obligation  to Effect the
Merger.  The respective  obligations of each party to effect the Merger shall be
subject to the  fulfillment  at or prior to the Effective  Time of the following
conditions:

          (a) Stockholder Approval.  The Company shall have received the Company
Stockholders'   Approval  and  the  Parent   shall  have   received  the  Parent
Shareholders' Approval.

          (b)  Registration  Statement;  State Securities Laws. The Registration
Statement  shall have become  effective in accordance with the provisions of the
Securities Act, and no stop order suspending such effectiveness  shall have been
issued and remain in effect and no  proceeding  seeking  such an order  shall be
pending or  threatened,  and Parent shall have received all state  securities or
"Blue  Sky"  permits  and other  authorizations  necessary  to issue the  Parent
Ordinary Shares and Parent ADSs pursuant to this Agreement and under the Company
Stock Plan after the Merger.

          (c)  Exchange  Listing.  The LSE  shall  have  agreed  to admit to the
Official  List  (subject only to  allotment)  the Parent  Ordinary  Shares to be
issued in  connection  with the  Merger and such  agreement  shall not have been
withdrawn  and the  Parent  Ordinary  Shares  and Parent  ADSs  issuable  to the
Company's  stockholders in the Merger and under the Company Stock Plan after the
Merger in accordance  with this Agreement shall have been authorized for listing
on the NYSE,  subject to official  notice of issuance,  and such agreement shall
not have been withdrawn.

          (d) HSR Act. Any waiting period (and any extension thereof) applicable
to the  consummation  of the Merger under the HSR Act shall have expired or been
terminated.

          (e) Injunctions or Restraints.  No court of competent  jurisdiction or
other competent Governmental or Regulatory Authority shall have enacted, issued,
promulgated,   enforced  or  entered  any  law  or  order  (whether   temporary,
preliminary  or permanent)  which is then in effect and has the effect of making
illegal or otherwise restricting,  preventing or prohibiting consummation of the
Merger or the other transactions contemplated by this Agreement.

          (f) H.M.  Treasury  Consent.  Parent (as required) shall have received
consent  from H.M.  Treasury  pursuant  to  Section  765 of the U.K.  Income and
Corporation  Taxes  Act 1988 in  respect  of the  Merger  and any  other  matter
contemplated hereby, or confirmation that no consent is required.

          (g) Governmental and Regulatory Consents and Approvals. Other than the
filings  provided for by Section 2.2, all  consents,  approvals  and actions of,
filings with and notices to any Governmental or Regulatory  Authority (including
under the HSR Act) required of Parent,  the Company or any of their Subsidiaries
to consummate  the Merger and the other matters  contemplated  hereby shall have
been made or obtained  (as the case may be) and become  Final Orders (as defined
in this Section below), and such Final Orders shall not,  individually or in the
aggregate,  contain terms or conditions that would have, or could  reasonably be
expected to have, a material adverse effect on Parent, the Surviving Corporation
and their  respective  Subsidiaries,  taken as a whole. A "Final Order" means an
action by the relevant  Governmental  or Regulatory  Authority that has not been
reversed,  stayed,  enjoined, set aside, annulled or suspended,  with respect to
which any waiting period  prescribed by applicable  law before the  transactions
contemplated  hereby  may  be  consummated  has  expired,  and as to  which  all
conditions to the  consummation  of such  transactions  prescribed by applicable
law, regulation or order have been satisfied.

          (h) UK Fair Trading Act. Any of:

                  (i) the  Office of Fair  Trading  (the  "OFT")  shall not have
         indicated in writing that the Secretary of State for Trade and Industry
         (the "SOS") in the  exercise of his powers  under the Fair  Trading Act
         1973 (the  "FTA")  intends to refer the  Merger or any matter  relating
         thereto to the Competition Commission ("COC"); or

                  (ii) in the  event of an COC  reference,  the COC  shall  have
         concluded  that the Merger  does not or may not be  expected to operate
         against the public interest; or

                  (iii) if on a reference the COC shall have  concluded that the
         Merger does or may be expected to operate against the public  interest,
         the SOS shall have  indicated  in writing  that it is his  intention to
         approve the Merger,

PROVIDED that if any  indication by the SOS referred to in (i) or (iii) above is
subject to  undertakings,  assurances,  or any other terms or  conditions,  such
undertakings,   assurances,  terms  or  conditions  would  not  have,  or  could
reasonably be expected not to have,  individually or in the aggregate,  a Parent
Material Adverse Effect.

          (i) Other  Consents  And  Approvals.  The  consent or approval of each
person  (other than a  Governmental  or Regulatory  Authority)  whose consent or
approval is required of Parent,  the Company or any of their  Subsidiaries under
any  Contract  in order to  consummate  the  Merger  and the other  transactions
contemplated  hereby  shall have been  obtained,  except for those  consents and
approvals  which,  if not obtained,  would not have, or could not  reasonably be
expected to have, a material adverse effect on the Surviving Corporation and its
Subsidiaries  taken as a whole or on the  ability  of Parent or the  Company  to
consummate the transactions contemplated hereby.

          Section  8.2  Conditions  to  Obligation  of  Parent And Merger Sub to
Effect the Merger.  The obligation of Parent and Merger Sub to effect the Merger
is further  subject to the  fulfillment,  at or prior to the Effective  Time, of
each of the following  additional  conditions (all or any of which may be waived
in whole or in part by Parent and Merger Sub in their sole discretion):

          (a) Representations and Warranties. The representations and warranties
made by the Company in this Agreement shall be true and correct, in all material
respects,  as of the Effective  Time as though made as of the Effective Time or,
in the  case of  representations  and  warranties  made as of a  specified  date
earlier than the Effective  Time on and as of such earlier date, and the Company
shall  have  delivered  to  Parent a  certificate,  dated the  Closing  Date and
executed in the name and on behalf of the Company by its  Chairman of the Board,
President or any Executive or Senior Vice President, to such effect.

          (b) Performance of  Obligations.  The Company shall have performed and
complied  with,  in  all  material  respects,  the  agreements,   covenants  and
obligations  which are required by this Agreement to be so performed or complied
with by the  Company  at or prior to the  Closing,  and the  Company  shall have
delivered  to Parent a  certificate,  dated the Closing Date and executed in the
name and on behalf of the Company by its Chairman of the Board, President or any
Executive or Senior Vice President, to such effect.

          (c) Material Adverse Effect.  Since the date of this Agreement,  there
shall  not have  occurred  a Company  Material  Adverse  Effect  and no facts or
circumstances  arising  after the date of this  Agreement  shall  have  occurred
which, individually or in the aggregate,  could reasonably be expected to have a
Company Material Adverse Effect.

          (d)  Proceedings.  All  proceedings  to be  taken  on the  part of the
Company in connection with the  transactions  contemplated by this Agreement and
all documents  incident  thereto shall be  reasonably  satisfactory  in form and
substance to Parent, and Parent shall have received copies of all such documents
and other  evidences as Parent may reasonably  request in order to establish the
consummation  of  such  transactions  and  the  taking  of  all  proceedings  in
connection therewith.

          Section  8.3  Conditions  to  Obligation  of the Company to Effect the
Merger. The obligation of the Company to effect the Merger is further subject to
the  fulfillment,  at or prior to the  Effective  Time, of each of the following
additional  conditions (all or any of which may be waived in whole or in part by
the Company in its sole discretion):

          (a) Representations and Warranties. The representations and warranties
made by Parent and Merger Sub in this  Agreement  shall be true and correct,  in
all  material  respects,  as of the  Effective  Time  as  though  made as of the
Effective Time or, in the case of  representations  and warranties  made as of a
specified  date earlier than the Effective  Time, on and as of such earlier date
and  Parent  and  Merger  Sub  shall  each  have  delivered  to  the  Company  a
certificate,  dated the Closing  Date and  executed in the name and on behalf of
Parent by its Chairman of the Board,  President or any Executive  Officer or any
Executive Director,  and in the name and on behalf of Merger Sub by its Chairman
of the Board, President or any Vice President, to such effect.

          (b)  Performance  of  Obligations.  Parent  and  Merger Sub shall have
performed and complied with, in all material respects, each agreement,  covenant
and obligation required by this Agreement to be so performed or complied with by
Parent or Merger Sub at or prior to the  Effective  Time,  and Parent and Merger
Sub shall each have  delivered to the Company a  certificate,  dated the Closing
Date and  executed  in the name and on behalf of Parent by its  Chairman  of the
Board,  President or any Executive Officer or any Executive  Director and in the
name and on behalf of Merger Sub by its Chairman of the Board,  President or any
Vice President, to such effect.

          (c) Tax Opinion. The Company shall have received an opinion,  based on
appropriate representations of the Company, Parent and Merger Sub, of Rosenman &
Colin  LLP,  counsel  to the  Company,  dated on or about  the date on which the
Registration  Statement  (or the  last  amendment  thereto)  shall  have  become
effective,  which opinion shall have been  confirmed in writing on and as of the
Closing Date to the effect that the Merger will  constitute  a  "reorganization"
within  the  meaning  of Code  Section  368(a)  and that no gain or loss will be
recognized for US federal income tax purposes by the stockholders of the Company
who  exchange  Company  Common Stock for Parent ADSs or Parent  Ordinary  Shares
pursuant  to the  Merger  (except  with  respect  to  cash  received  in lieu of
fractional Parent ADSs or Parent Ordinary Shares).

          (d) Proceedings. All proceedings to be taken on the part of Parent and
Merger Sub in connection  with the  transactions  contemplated by this Agreement
and all documents incident thereto shall be reasonably  satisfactory in form and
substance to the Company, and the Company shall have received copies of all such
documents and other evidences as the Company may reasonably  request in order to
establish  the  consummation  of  such   transactions  and  the  taking  of  all
proceedings in connection therewith.

          (e) Registration of Option Shares.  Pursuant to Section 2.9(b), Parent
shall have  filed a  registration  statement  with the SEC,  which  registration
statement  shall be effective at the Effective  Time, with respect to the Parent
Ordinary  Shares to be  issued  upon the  exercise  of Stock  Options  after the
Effective Time.

          (f) Material Adverse Effect.  Since the date of this Agreement,  there
shall not have occurred a Parent Material  Adverse Effect where,  following such
Parent Material Adverse Effect, the Parent Share Value (without giving effect to
the Exchange Rate) is less than 135p.

                                   ARTICLE IX

                        TERMINATION, AMENDMENT AND WAIVER

          Section  9.1  Termination.  This Agreement may be terminated,  and the
transactions  contemplated  hereby  may be  abandoned,  at any time prior to the
Effective Time, whether prior to or after the Company Stockholders'  Approval or
the Parent Shareholders' Approval:

          (a) By mutual written  agreement of the parties hereto duly authorized
     by action taken by or on behalf of their respective Boards of Directors; or

          (b)  By  either  the  Company  or  Parent  upon  notification  to  the
     non-terminating party by the terminating party:

               (i) at any time after May 31, 2000,  if the Merger shall not have
          been  consummated  on or  prior  to such  date  and  such  failure  to
          consummate  the Merger is not caused by a breach of this  Agreement by
          the terminating party; provided,  however, that if on such date Parent
          and the Company and their  respective  Subsidiaries  have not received
          all of the approvals  required in order to satisfy the  conditions set
          forth in Section 8.1(f),  8.1(g) or 8.1(h) but all other conditions to
          effect  the  Merger  shall be  fulfilled  or shall be capable of being
          fulfilled,  then, at the option of either Parent or the Company (which
          shall be  exercised  by written  notice),  the term of this  Agreement
          shall be extended until August 31, 2000;

               (ii)  if  the  Company  Stockholders'   Approval  or  the  Parent
          Shareholders'  Approval shall not be obtained by reason of the failure
          to obtain the requisite vote upon a vote actually held at a meeting of
          such stockholders or shareholders,  or any adjournment thereof, called
          therefor;

               (iii) if there has been a material breach of any  representation,
          warranty,  covenant or  agreement  on the part of the  non-terminating
          party set forth in this  Agreement  (determined in all cases as if the
          terms  "material"  or  "materially"  were  not  included  in any  such
          representation  or  warranty),  which  breach  is not  curable  or, if
          curable,  has not been cured within thirty (30) days following receipt
          by the  non-terminating  party  of  notice  of such  breach  from  the
          terminating  party which  breach,  when taken  together with any other
          breaches of representations,  warranties,  covenants and agreements of
          the  non-terminating  party contained in this Agreement,  has or could
          reasonably be expected to have a Company  Material Adverse Effect or a
          Parent Material Adverse Effect, as the case may be; or

               (iv) if any court of competent  jurisdiction  or other  competent
          Governmental or Regulatory Authority shall have issued an order making
          illegal or otherwise  preventing  or  prohibiting  the Merger and such
          order shall have become final and nonappealable.

          Section  9.2 Effect of  Termination.  In the event of  termination  of
this Agreement by either Parent or the Company,  this Agreement  shall forthwith
become void and, except as set forth in Section 7.7, there shall be no liability
hereunder on the part of the Company,  Parent or Merger Sub or their  respective
officers or directors, provided, however, that nothing contained in this Section
9.2 shall  relieve any party  hereto from any  liability  for any breach of this
Agreement.

          Section  9.3  Amendment.  This Agreement may be amended by the parties
hereto,  by or pursuant to action taken by their respective Boards of Directors,
at any time before or, to the extent  permitted  by  applicable  Law,  after any
approval of the Merger by the  stockholders  of the Company.  This Agreement may
not be amended  except by an instrument  in writing  signed on behalf of each of
the parties hereto.

          Section   9.4 Waiver.  At any time prior to the  Effective  Time,  the
parties  hereto  may (i)  extend  the  time  for the  performance  of any of the
obligations  or  other  acts  of  the  other  parties  hereto,  (ii)  waive  any
inaccuracies in the  representations  and warranties  contained herein or in any
document  delivered  pursuant hereto and (iii) waive  compliance with any of the
agreements  or  conditions  contained  herein  which may legally be waived.  Any
agreement on the part of a party hereto to any such extension or waiver shall be
valid only if set forth in an  instrument  in  writing  signed on behalf of such
party.


                                    ARTICLE X

                               GENERAL PROVISIONS

          Section 10.1 Non-Survival of Representations  and Warranties.  None of
the  representations  and  warranties  in this  Agreement  or in any  instrument
delivered pursuant to this Agreement shall survive the Effective Time; provided,
however,  this  Section  10.1 shall not limit any  covenant or  agreement of the
parties which by its terms contemplates performance after the Effective Time.

          Section 10.2 Notices. All notices and other  communications  hereunder
shall be in writing and shall be deemed given if delivered  personally,  sent by
overnight  courier or  telecopied  (with a  confirmatory  copy sent by overnight
courier to the parties at the following  addresses (or at such other address for
a party as shall be specified by like notice):

                  (a)      if to Parent or Merger Sub, to

                                    c/o Cordiant Communications Group plc
                                    121-141 Westbourne Terrace
                                    London, W2 6JR
                                    Attention:  Michael Bungey
                                    Facsimile No.:  011-44-171-262-4300

                           with copies to:

                                    White & Case LLP
                                    1155 Avenue of the Americas
                                    New York, NY  10036
                                    Attention:  Timothy B. Goodell, Esq.
                                    Facsimile No.:  (212) 354-8113

                           and:

                                    Macfarlanes
                                    10 Norwich Street London EC4A 1BD
                                    Attention:  Mary Leth
                                    Facsimile No.:  011-44-171-831-9607

                  (b)      if to the Company, to

                                    Healthworld Corporation
                                    100 Avenue of the Americas
                                    New York, NY 10010
                                    Attention:  Steven Girgenti
                                    Facsimile No.:  (212) 966-2743

                           with a copy to:

                                    Rosenman & Colin LLP
                                    575 Madison Avenue
                                    New York, New York 10022
                                    Attention:  Wayne A. Wald, Esq.
                                    Facsimile No.:  (212) 940-8776

                           and:

                                    Rakisons Solicitors
                                    Clements House
                                    14/18 Gresham Street
                                    London EC2V7JE
                                    DX 206 London, England
                                    Attention:  Jonathan Polin
                                    Facsimile No.:  011-44-207-367-8001

          Section  10.3  Interpretation.  When  a  reference  is  made  in  this
Agreement to a Section,  such reference  shall be to a Section of this Agreement
unless otherwise indicated. The table of contents and headings contained in this
Agreement  are for  reference  purposes only and shall not affect in any way the
meaning or  interpretation  of this  Agreement.  Whenever  the words  "include,"
"includes" or "including" are used in this Agreement, they shall be deemed to be
followed by the words "without limitation."

          Section  10.4   Counterparts.   This  Agreement  may  be  executed  in
counterparts,  all of which shall be considered  one and the same  agreement and
shall become effective when one or more counterparts have been signed by each of
the parties and delivered to the other parties.

          Section 10.5 Entire  Agreement;  No  Third-Party  Beneficiaries.  This
Agreement,  including the documents and instruments referred to herein, together
with the  Confidentiality  Agreement  dated August 3, 1999, (a)  constitutes the
entire  agreement and supersedes all prior agreements and  understandings,  both
written and oral,  among the parties with respect to the subject  matter  hereof
and (b) is not  intended  to confer  upon any  person or entity  other  than the
parties any rights or remedies  hereunder,  except (i)  pursuant to Section 7.10
and (ii) that Parent  agrees to  indemnify  and hold  harmless  the  Shareholder
Parties against,  and to reimburse the Shareholder  Parties with respect to, any
and all taxes,  interest and penalties  arising from Parent's breach of Sections
7.11 and 7.12.

          Section 10.6 Governing  Law. This Agreement  shall be governed by, and
construed in accordance  with, the laws of the State of New York,  regardless of
the laws that might otherwise govern under applicable principles of conflicts of
laws thereof; provided however, that the Merger shall be governed by the laws of
the State of Delaware.

          Section 10.7 Assignment. Neither this Agreement nor any of the rights,
interests  or  obligations  hereunder  shall be  assigned  by any of the parties
without the prior written  consent of the other parties,  except that Merger Sub
may assign,  in its sole  discretion,  any of or all its rights,  interests  and
obligations  under this Agreement to Parent or to any direct or indirect  wholly
owned  subsidiary of Parent,  but no such  assignment  shall  relieve  Parent or
Merger  Sub of  any  of its  obligations  hereunder.  Subject  to the  preceding
sentence,  this Agreement shall be binding upon, inure to the benefit of, and be
enforceable by, the parties and their respective successors and assigns.

          Section  10.8  Severability.  If any term or other  provision  of this
Agreement is invalid, illegal or incapable of being enforced by any rule of law,
or public policy,  all other  conditions and provisions of this Agreement  shall
nevertheless  remain in full force and effect so long as the  economic  or legal
substance of the transactions contemplated hereby are not affected in any manner
materially  adverse to any party. Upon such determination that any term or other
provision is invalid,  illegal or incapable of being enforced, the parties shall
negotiate  in good faith to modify this  Agreement  so as to effect the original
intent of the parties as closely as possible in a mutually  acceptable manner in
order that the  transactions  be consummated as originally  contemplated  to the
fullest extent possible.

          Section 10.9  Enforcement  of this  Agreement.  The parties agree that
irreparable  damage would occur in the event that any of the  provisions of this
Agreement  were not performed in accordance  with their  specific  terms or were
otherwise breached.  It is accordingly agreed that the parties shall be entitled
to an injunction or  injunctions  to prevent  breaches of this  Agreement and to
enforce  specifically the terms and provisions hereof in any court of the United
States or any state  having  jurisdiction,  this being in  addition to any other
remedy to which they are entitled at law or in equity.

          Section 10.10 Incorporation of Exhibits. The Company Disclosure Letter
and all Exhibits and annexes  attached  hereto and referred to herein are hereby
incorporated  herein  and made a part  hereof for all  purposes  as if fully set
forth herein.



<PAGE>


          IN WITNESS  WHEREOF,  Parent,  Merger Sub and the Company  have caused
this  Agreement  to be  signed  by  their  respective  officers  thereunto  duly
authorized all as of the date first written above.



                                             CORDIANT COMMUNICATIONS GROUP PLC

                                             By: /s/ Arthur D'Angelo
                                                 -----------------------------
                                                 Name:  Arthur D'Angelo
                                                 Title:  Finance Director



                                             HEALTHWORLD ACQUISITION CORP.


                                             By: /s/ Arthur D'Angelo
                                                 -----------------------------
                                                 Name:  Arthur D'Angelo
                                                 Title: President



                                             HEALTHWORLD CORPORATION

                                             By: /s/ Steven Girgenti
                                                 -----------------------------
                                                 Name:  Steven Girgenti
                                                 Title: President


                                                                       EXHIBIT 2

                              STOCKHOLDER AGREEMENT


         AGREEMENT dated November 9, 1999, among Cordiant  Communications  Group
plc,  a company  organized  under the laws of  England  and Wales  ("Cordiant"),
Healthworld Acquisition Corporation,  a Delaware corporation and a direct wholly
owned subsidiary of Cordiant ("Sub"), and William Butler (the "Stockholder").

                              W I T N E S S E T H:

         WHEREAS,   concurrently  herewith,   Cordiant,   Sub,  and  Healthworld
Corporation,  a Delaware  corporation  (the  "Company"),  are  entering  into an
Agreement  and Plan of Merger (as such  agreement  may hereafter be amended from
time to time, the "Merger Agreement"), pursuant to which Sub will be merged with
and into the Company and the Company shall continue as the surviving corporation
(the "Merger");

         Whereas,  the  Stockholder  Beneficially  Owns,  as of the date hereof,
520,070 shares (the "Shares") of common stock,  $.01 par value per share, of the
Company (the "Common Stock"); and

         WHEREAS,  as an inducement  and a condition to entering into the Merger
Agreement,  Cordiant and Sub have required that the Stockholder  agree,  and the
Stockholder has agreed, to enter into this Agreement;

         NOW,  THEREFORE,  in  consideration  of the  foregoing  and the  mutual
premises,  representations,   warranties,  covenants  and  agreements  contained
herein,  the parties  hereto,  intending  to be legally  bound,  hereby agree as
follows:

         1.  Definitions.  Unless other defined  herein,  all capitalized  terms
used herein shall have the meanings given to such terms in the Merger Agreement.
For purposes of this Agreement:

                  (a) "Beneficially Own" or "Beneficial  Ownership" with respect
to any securities  shall mean having  "beneficial  ownership" of such securities
(as determined pursuant to Rule 13d-3 under the Securities Exchange Act of 1934,
as  amended  (the  "Exchange  Act")),   including  pursuant  to  any  agreement,
arrangement or understanding, whether or not in writing.

         Without duplicative counting of the same securities by the same holder,
securities  Beneficially Owned by a Person shall include securities Beneficially
Owned by all other  Persons with whom such Person would  constitute a "group" as
within the meanings of Section 13(d)(3) of the Exchange Act.

                  (b) "Exchange Rate" means the average  currency  exchange rate
of pounds  sterling to US dollars based upon the noon buying rate in the City of
New York for cable  transfers in foreign  currencies as announced by the Federal
Reserve Bank of New York for customs  purposes over the 10  consecutive  Trading
Days  ending on the day on which the Stock  Options  are  exercised  pursuant to
Section 3.

                  (c)  "Parent  Share  Value"  shall mean the product of (x) the
average of the closing  middle market  quotation of a Parent Share on the LSE as
reported in the Daily Official List of the London Stock Exchange for each of the
ten  consecutive  Trading Days ending on the day on which the Stock  Options are
exercised pursuant to Section 3 multiplied by (y) Exchange Rate.

                  (d) "Parent  Shares"  shall mean the ordinary  shares,  with a
nominal  value  of U.K.  fifty  pence  each  ("Ordinary  Shares"),  of  Cordiant
(including  any  options or other  rights to receive  Ordinary  Shares)  and the
American Depositary Shares, each representing the right to receive five Ordinary
Shares ("ADSs").

                  (e)   "Person"   shall   mean  an   individual,   corporation,
partnership,  limited  liability  company,  joint venture,  association,  trust,
unincorporated organization or other entity.

                  (f) "Share Value" shall be determined as follows:

                    (i) if the Parent  Share  Value is equal to or greater  than
               $2.5054 and equal to or less than $3.4838,  the Share Value shall
               be $20.00;

                    (ii) if the Parent Share Value is greater than $3.4838,  the
               Share Value shall be $23.00; and

                    (iii) if the Parent  Share Value is less than  $2.5054,  the
               Share Value shall be $17.00.

                  (g) "Trading Day" shall mean any day on which  securities  are
traded,  with  respect to ADSs,  on the New York Stock  Exchange,  Inc. and with
respect to Ordinary Shares, on the London Stock Exchange Limited.

         2.  Provisions  Concerning  Common  Stock.  (a) The Stockholder  hereby
agrees that during the period  described in clause (b) below,  at any meeting of
the holders of Common Stock of the Company,  however  called,  or in  connection
with any written  consent of the  holders of Common  Stock of the  Company,  the
Stockholder  shall vote (or cause to be voted) the Shares of Common Stock of the
Company,  (i) in favor of the Merger,  the execution and delivery by the Company
of the Merger  Agreement  and the approval of the terms  thereof and each of the
other actions  contemplated  by the Merger  Agreement and this Agreement and any
actions required in furtherance  thereof and hereof;  (ii) against any action or
agreement that would result in a breach in any material respect of any covenant,
representation  or warranty or any other  obligation or agreement of the Company
under the Merger  Agreement  or this  Agreement;  and (iii)  except as otherwise
agreed to in writing  in advance by  Cordiant,  against  the  following  actions
(other  than  the  Merger  and  the  transactions  contemplated  by  the  Merger
Agreement):  (A) any  extraordinary  corporate  transaction,  such as a  merger,
consolidation  or  other  business  combination  involving  the  Company  or its
Subsidiaries;  (B) a sale,  lease or transfer of a material  amount of assets of
the  Company  or  its  Subsidiaries,  or  a  reorganization,   recapitalization,
dissolution or liquidation of the Company or its Subsidiaries; (C) any change in
a majority of the persons who  constitute the board of directors of the Company;
(D) any change in the present  capitalization of the Company or any amendment of
the Company's  Certificate of  Incorporation  or Bylaws;  (E) any other material
change in the Company's corporate structure or business; or (F) any other action
involving the Company or its Subsidiaries which is intended, or could reasonably
be  expected,  to  materially  impede,   interfere  with,  delay,  postpone,  or
materially adversely affect the Merger and the transactions contemplated by this
Agreement and the Merger  Agreement.  The  Stockholder  shall not enter into any
agreement  or  understanding  with any  Person  the  effect  of  which  would be
inconsistent  with or violative of the provisions  and  agreements  contained in
this Section 2.

         (b) The  obligations  of the  Stockholders  under clauses (i), (ii) and
(iii)(C),  (D), (E) and (F) of this Section 2 shall  terminate on the earlier to
occur of the  Effective  Time and the  termination  of the Merger  Agreement  in
accordance  with its terms.  The  obligations  of the  Stockholder  under clause
(iii)(A)  and (B) of this  Section 2 shall  terminate on the earlier to occur of
the Effective Time and 120 days after the termination of the Merger Agreement in
accordance  with its terms (unless the Merger  Agreement is terminated by reason
of the  failure  to  obtain  Parent  Shareholders'  Approval  in which  case the
Stockholder's  obligations  under this Section 2 shall terminate  simultaneously
with the termination of the Merger Agreement).

         3.  Option  to Purchase.  In order to induce  Cordiant and Sub to enter
into the Merger Agreement,  the Stockholder  hereby grants to Sub an irrevocable
option (the "Stock  Options")  to  purchase,  all, and not less than all, of the
Shares at a purchase  price per share equal to the Share Value,  payable in cash
(the  "Purchase  Price"),  solely upon, and subject to, the terms and conditions
set forth below.  The Stock Options may only be exercised if Sub  simultaneously
exercises  all other  options held by it to purchase all, and not less than all,
of the shares of Common Stock covered by such  options.  The Stock Options shall
become  exercisable  solely in the event that the Merger Agreement is terminated
pursuant  to (i)  Section  9.1(b)(ii)  thereof,  but only if the  basis for such
termination  is the failure to obtain the Company  Stockholder  Approval or (ii)
Section  9.1(b)(iii)  thereof,  but only if the basis for such  termination is a
breach by the Company,  or the  Stockholder  materially  breaches any  agreement
contained in this Agreement, in which event the Stock Options shall, in any such
case, become immediately exercisable at any time and from time to time upon such
termination or upon Cordiant and Sub being informed of such breach,  as the case
may be, and until the date  which is 20 days after the date of such  termination
or the date on which  Cordiant and Sub are informed of such breach,  as the case
may be,  provided,  that if at the  expiration  of such 20-day  period the Stock
Options cannot be exercised by reason of any preliminary or final  injunction or
other order issued by any court or  governmental,  administrative  or regulatory
agency or authority  prohibiting  the exercise of the Stock Options  pursuant to
this  Agreement,  or because all  waiting  periods  under the  Hart-Scott-Rodino
Antitrust Improvements Act of 1976, as amended (the "HSR ACT"), required for the
purchase of the Shares upon such exercise shall not have expired or been waived,
the Stock Options shall be exercisable until 10 business days after the later of
the date on which such  impediment to exercise  shall have been removed or shall
have become final and not subject to appeal.  In all other instances,  the Stock
Options shall  terminate upon the  termination of the Merger  Agreement.  In the
event that Cordiant wishes to exercise the Stock Options,  Cordiant shall send a
written notice (the "Notice") to the  Stockholder  identifying  the place (which
shall be in New York City for each  Stockholder  who is a resident of the United
States  and in London  for each  Stockholder  who is a  resident  of the  United
Kingdom) and date (not less than two business days nor greater than ten business
days from the date of the  Notice)  for the  closing of such  purchase.  At such
closing,  Cordiant shall receive  certificates for the Shares, duly endorsed for
transfer,  and shall make  payment  therefor  by wire  transfer  of  immediately
available funds.

         4.  Disposition of Parent Shares.

               (a) Restrictions on Disposition.  The Stockholder  hereby agrees,
except as permitted in this Section 4(a) and Section 4(b) below, not to directly
or indirectly,  offer to sell, contract to sell,  transfer,  assign, cause to be
redeemed or otherwise sell or dispose of any of the Parent Shares  (collectively
a  "Disposition")  received by the  stockholder  in  connection  with the Merger
without the prior written consent of Cordiant.  Notwithstanding  anything to the
contrary  provided in this Agreement,  the  Stockholder  shall have the right to
transfer Parent Shares (i) to any Family Member, (ii) to the trustee or trustees
of a trust solely  (except for remote  contingent  interests) for the benefit of
the  Stockholder   and/or  one  or  more  Family  Members  and/or  a  charitable
organization  (a  "Family  Member  Trust"),  (iii) to a  foundation  created  or
established by the Stockholder, or any other charitable organization,  (iv) to a
corporation of which the Stockholder  and/or any Family Member and/or any Family
Member  Trust  owns  all of the  outstanding  capital  stock,  (v) to a  limited
liability  company of which the Stockholder  and/or any Family Member and/or any
Family Member Trust owns all of the outstanding membership interests,  (vi) to a
partnership of which the Stockholder  and/or any Family Member and/or any Family
Member  Trust  owns all of the  partnership  interests,  (vii) to the  executor,
administrator or personal representative of the estate of the Stockholder or any
other Family Member, or (viii) to any guardian, trustee or conservator appointed
with respect to the assets of the Stockholder, provided, that in the case of any
such  transfer,  the  transferee  shall  execute an agreement to be bound by the
terms of this  Agreement  (each  such  transfer,  a  "Permitted  Transfer"  and,
collectively,  the  "Permitted  Transfers").  For  purposes  of this  Agreement,
"Family  Member"  shall mean (a) the  Stockholder's  spouse,  if living with the
Stockholder,  (b) any one of the following:  the Stockholder's  father,  mother,
issue,  brother  or sister,  and the issue of a brother  or sister,  and (c) the
spouse of any  Family  Member  described  in (b) above,  if the spouse  shall be
living with that Family Member.  The  Stockholder  hereby agrees and consents to
the entry of stop transfer  instructions with Cordiant's  transfer agent against
the transfer of such Parent  Shares except in  compliance  with this  Agreement.
Notwithstanding  the  foregoing,  the  Stockholder  may pledge,  hypothecate  or
otherwise  grant a security  interest  in all or a portion of the Parent  Shares
beneficially owned by him during the term of this Agreement;  provided, however,
that any Person  receiving  such  Parent  Shares  shall be subject to all of the
restrictions  on  Disposition of such Parent Shares imposed by this Agreement to
the same extent as the Stockholder.

               (b) Permitted  Dispositions.  The  Stockholder may not effect any
Disposition of Parent Shares  received by the Stockholder in connection with the
Merger  except as  follows:  (i)  during  the  twelve-month  period  immediately
following the Effective Time the  Stockholder  may effect the Disposition of not
more than 15% of the Parent Shares  Beneficially  Owned by the  Stockholder  and
(ii) during the  twenty-four-month  period  immediately  following the Effective
Time (the "Period"), the Stockholder may effect the Disposition of not more than
55% of the  Parent  Shares  Beneficially  Owned  by the  Stockholder.  Upon  the
expiration of the Period,  the Stockholder may effect the Dispositions of all or
any  portion  of the  Parent  Shares  Beneficially  Owned by him  subject to any
applicable  restrictions  under the Federal  Securities Law and  restrictions of
general  application  under  English law, the Listing  Rules of the London Stock
Exchange,  if applicable,  and  Cordiant's  policies made pursuant to such rules
regarding  dealings in Parent  Shares by  directors  and  relevant  employees of
Cordiant and its subsidiaries,  if applicable.  Notwithstanding  anything to the
contrary contained in this Section 4, the Stockholder hereby agrees that for the
period commencing at the Effective Time and ending on the date which is 180 days
after the  expiration  of the  Period,  the  Stockholder  shall give  Cordiant 1
business day prior written  notice of any intended  Disposition of Parent Shares
to be made by the  Stockholder  and at the request of Cordiant  agrees to effect
such Disposition through brokers or other financial intermediaries designated by
Cordiant to maintain an orderly  trading market for the Parent Shares,  provided
that  such  financial   intermediary  agrees  to  effect  and  does  effect  the
Disposition in a reasonable period following such notice.

         5.  Representations and Warranties of the Stockholder.  The Stockholder
hereby represents and warrants to each of Cordiant and Sub as follows:

             (a) Ownership of  Shares.   The Stockholder is the record holder of
or Beneficially Owns the Shares.  On the date hereof,  the Shares constitute all
of the  shares of Common  Stock  owned of  record or  Beneficially  Owned by the
Stockholder  (excluding  any Stock Options (as defined in the Merger  Agreement)
held by the  Stockholder).  The Stockholder has sole voting power and sole power
to issue instructions with respect to the matters set forth in Section 2 hereof,
sole power of  disposition,  sole power of  conversion,  sole power to  exercise
dissenters'  rights and sole power to agree to all of the  matters  set forth in
this  agreement,  in  each  case  with  respect  to all of the  Shares,  with no
limitations,   qualifications  or  restrictions  on  such  rights,   subject  to
applicable securities laws and the terms of this Agreement.

               (b)  Power;  Binding  Agreement.  The  Stockholder  has the legal
capacity,  power and authority to enter into and perform all of his  obligations
under this Agreement. The execution,  delivery and performance of this Agreement
by the Stockholder will not violate any other Agreement to which the Stockholder
is a party including,  without  limitation,  any voting agreement,  shareholders
agreement or voting trust. This Agreement has been duly and validly executed and
delivered by the Stockholder  and  constitutes a valid and binding  agreement of
the  Stockholder,  enforceable  against the  Stockholder in accordance  with its
terms  except  that  such  enforceability  (i)  may be  limited  by  bankruptcy,
insolvency,  moratorium  or other similar laws  relating to the  enforcement  of
creditors' rights generally and (ii) is subject to general  principles of equity
and  discretion  of the court before which any  proceedings  seeking  injunctive
relief or specific  performance may be sought. There is no beneficiary or holder
of a voting  trust  certificate  or other  interest  of any  trust of which  the
Stockholder  is trustee whose consent is required for the execution and delivery
of this agreement or the  consummation  by the  Stockholder of the  transactions
contemplated  hereby. If the Stockholder is married and the Stockholder's Shares
constitute community property, this agreement has been duly authorized, executed
and  delivered  by,  and  constitutes  a valid and  binding  agreement  of,  the
Stockholder's  spouse,  enforceable  against such Person in accordance  with its
terms  except  that  such  enforceability  (i)  may be  limited  by  bankruptcy,
insolvency,  moratorium  or other similar laws  relating to the  enforcement  of
creditors' rights generally and (ii) is subject to general  principles of equity
and  discretion  of the court before which any  proceedings  seeking  injunctive
relief or specific performance may be sought.

               (c) No Conflicts.  Except for filings,  permits,  authorizations,
consents and  approvals  under the HSR Act and the  Securities  Act of 1933,  if
applicable,  (A) no  filing  with,  and no  permit,  authorization,  consent  or
approval of, any state or federal  public body or authority is necessary for the
execution  of this  Agreement by the  Stockholder  and the  consummation  by the
Stockholder  of  the  transactions  contemplated  hereby  and  (B)  none  of the
execution and delivery of this Agreement by the Stockholder, the consummation by
the  Stockholder of the  transactions  contemplated  hereby or compliance by the
Stockholder with any of the provisions  hereof shall, in a manner which would be
material  and  adverse  to the  ability of the  Stockholder  to  consummate  the
transactions contemplated hereby or to comply with the terms hereof, result in a
violation or breach of, or constitute  (with or without  notice or lapse of time
or both) a  default  (or give  rise to any  third  party  right of  termination,
cancellation,  material  modification or  acceleration)  under any of the terms,
conditions  or  provisions  of any note,  bond,  mortgage,  indenture,  license,
contract, commitment, arrangement,  understanding, agreement or other instrument
or  obligation of any kind to which the  Stockholder  is a party or by which the
Stockholder or any of the  Stockholder's  properties or assets may be bound,  or
(3) violate any order, writ, injunction,  decree, judgment, order, statute, rule
or  regulation  applicable  to the  Stockholder  or  any  of  the  Stockholder's
properties or assets.

               (d) No Encumbrances.  Except as applicable in connection with the
transactions  contemplated hereby or as set forth on Schedule B attached hereto,
the  Shares and the  certificates  representing  the Shares are now,  and at all
times during the term hereof will be, held by the  Stockholder,  or by a nominee
or custodian  for the benefit of the  Stockholder,  free and clear of all liens,
claims, security interests, proxies, voting trusts or agreements, understandings
or  arrangements  or any  other  encumbrances  whatsoever,  except  for any such
encumbrances or proxies arising hereunder in favor of Cordiant.

               (e) No Finder's  Fees. No broker,  investment  banker,  financial
adviser  or other  person  is  entitled  to any  broker's,  finder's,  financial
adviser's or other similar fee or commission in connection with the transactions
contemplated  hereby  based  upon  arrangements  made  by or on  behalf  of  the
Stockholder  other than Bear Stearns & Co. Inc.,  the fees and expenses of which
shall be paid by the Company.

               (f) Reliance by Cordiant and Sub. The Stockholder understands and
acknowledges  that  Cordiant and Sub are entering  into the Merger  Agreement in
reliance upon the Stockholder's execution and delivery of this Agreement.

               6.   Additional  Covenants of the  Stockholder.  The  Stockholder
hereby covenants to each of Cordiant and Sub as follows:

               (a) No  Solicitation.  Subject  to the  provisions  contained  in
Section 10 of this  Agreement,  the  Stockholder  shall not, in his  capacity as
such,   directly  or  indirectly,   solicit  (including  by  way  of  furnishing
information)  or respond to any  inquiries  or the making of any proposal by any
Person or entity (other than Cordiant or any affiliate of Cordiant) with respect
to the Company that constitutes a Takeover Proposal. If the Stockholder receives
any such  inquiry  or  proposal,  then the  Stockholder  shall  promptly  inform
Cordiant of the existence  thereof.  The Stockholder will immediately  cease and
cause to be terminated any existing activities, discussions or negotiations with
any parties conducted heretofore with respect to any of the foregoing.

                (b)   Restriction   on   Transfer   of   Shares,   Proxies   and
Non-Interference.  Beginning on the date hereof and ending on the later to occur
of (A) last date the Stock Options are exercisable  pursuant to Section 3 hereof
and (B) the date that all of the Stockholder's  obligations under Section 2 have
terminated, except as contemplated by this Agreement or the Merger Agreement, no
Stockholder shall,  directly or indirectly,  (i) offer for sale, sell, transfer,
tender,  pledge,  encumber,  assign or  otherwise  dispose of, or enter into any
contract,  option or other  arrangement  or  understanding  with  respect  to or
consent to the offer for sale,  sale,  transfer,  tender,  pledge,  encumbrance,
assignment  or other  disposition  of, any or all of the Shares or any  interest
therein;  (ii) except as contemplated  by this  Agreement,  grant any proxies or
powers of attorney,  deposit any of the Shares into a voting trust or enter into
a voting  agreement with respect to any of the Shares;  or (iii) take any action
that would make any  representation  or  warranty of the  Stockholder  contained
herein  untrue or incorrect or have the effect of  preventing  or disabling  the
Stockholder from performing the Stockholder's  obligations under this Agreement.
Notwithstanding   anything  to  the  contrary  provided  in  this  Agreement,  a
Stockholder  shall have the right to make  Permitted  Transfers  of Shares.  The
Stockholder agrees with, and covenants to, Sub that beginning on the date hereof
and  ending on the last date the  Stock  Options  are  exercisable  pursuant  to
Section 3 hereof,  the Stockholder  shall not request that the Company  register
the transfer  (book-entry  or otherwise) of any  certificate  or  uncertificated
interest  representing  any of the  Shares,  unless  such  transfer  is  made in
compliance with this Agreement (including the provisions of Section 2 hereof).

               (c)  Additional  Shares.  The  Stockholder  agrees,   while  this
Agreement is in effect (i) to notify  Cordiant and Sub promptly of the number of
any shares of Common  Stock  acquired by the  Stockholder  after the date hereof
(the "Additional  Shares") and (ii) to vote such Additional Shares in accordance
with Section 2 hereof. Such Additional Shares shall also be subject to the Stock
Option granted to Sub pursuant to Section 3 hereof and the restriction contained
in Section 6(b)(i) and (ii) above.

         7.  Representations  and  Warranties of Cordiant and Sub.  Cordiant and
Sub hereby  covenant,  represent  and  warrant to the  Stockholder  that each of
Cordiant and Sub has the legal  capacity,  power and authority to enter into and
perform all of such party's  obligations  under this  Agreement;  the execution,
delivery and  performance of this Agreement by Cordiant and Sub will not violate
or result in a breach of any other  material  agreement to which Cordiant or Sub
is a party; the execution and delivery of this Agreement and the consummation of
the transactions  contemplated hereby (i) have been duly authorized by the board
of  directors  of  Cordiant  and Sub,  and (ii) do not and will not  violate any
provision of the certificate of incorporation or by-laws of Cordiant or Sub; and
this  Agreement  has been duly and validly  executed  and  delivered  by each of
Cordiant and Sub and  constitutes  a valid and binding  agreement of such party,
enforceable against such party in accordance with its terms.

         8. Further  Assurances. From time to time, at the other party's request
and without further  consideration,  each party hereto shall execute and deliver
such additional reasonable documents and take all such further reasonable lawful
action as may be necessary or desirable to consummate and make effective, in the
most  expeditious  manner  practicable,  the  transactions  contemplated by this
Agreement.

         9.  Termination;  Expenses  and Fee. (a) The covenants  and  agreements
contained herein with respect to the Shares shall terminate (i) in the event the
Merger  Agreement  is  terminated  in  accordance  with  its  terms,  upon  such
termination,  except that the  provisions of Sections 2, 3 and 6(b) hereof shall
survive any such  termination  solely in accordance with their terms and (ii) in
the event the Merger is  consummated,  at the  Effective  Time,  except that the
provisions of Section 4 hereof shall survive any such termination,  provided, in
each case, that the provisions of Section 12 and Section 13 hereof shall survive
any termination of this Agreement, and provided, further, that no termination of
this Agreement shall relieve any party of liability for a breach hereof.

               (b) Each party  shall bear its own  expenses in  connection  with
this Agreement and the transactions contemplated hereby.

         10.  Stockholder  Capacity.  The  Stockholder  is  not  executing  this
Agreement and does not make any agreement or understanding  herein in his or her
capacity as a director or officer of the  Company and nothing  contained  herein
shall limit or affect any actions taken by the  Stockholder in his capacity as a
director or officer of the Company to the extent such action is permitted by, or
not  prohibited  by,  the  Merger  Agreement,  and none of such  actions in such
capacities  shall be  deemed  to  constitute  a breach  of this  Agreement.  The
Stockholder  signs solely in his capacity as the record and beneficial owner of,
or the trustee of a trust whose  beneficiaries are the beneficial owners of, the
Shares.

         11. Sophistication. The Stockholder acknowledges that he is an informed
and sophisticated  investor and, together with his advisors, has undertaken such
investigation as they have deemed necessary,  including the review of the Merger
Agreement and this Agreement,  to enable the Stockholder to make an informed and
intelligent decision with respect to the Merger Agreement and this Agreement and
the transactions contemplated thereby and hereby.

         12.  Confidentiality.  Each  of  the  parties  hereto  recognizes  that
successful  consummation of the transactions  contemplated by this Agreement may
be  dependent  upon  confidentiality  with  respect to the  matters  referred to
herein. In this connection, pending public disclosure thereof, each party hereby
agrees not to disclose or discuss  such  matters with anyone not a party to this
Agreement or the Merger Agreement (other than such party's counsel and advisors,
if any) without the prior written consent of the other party, except for filings
required  pursuant to the Exchange Act and the rules and regulations  thereunder
or disclosures  such party's  counsel  advises are necessary in order to fulfill
such  party's  obligations  imposed by law, in which event such party shall give
notice of such disclosure to the other party as promptly as practicable so as to
enable the other  party to seek a  protective  order  from a court of  competent
jurisdiction with respect thereto.

         13.   Miscellaneous.

               (a) Entire  Agreement.  This  Agreement and the Merger  Agreement
constitute the entire agreement  between the parties with respect to the subject
matter hereof and supersede all other prior agreements and understandings,  both
written and oral, between the parties with respect to the subject matter hereof.

               (b) Certain Events.  The  Stockholder  agrees that this Agreement
and the obligations hereunder shall attach to the Stockholder's Shares and shall
be binding upon any person or entity to which legal or  beneficial  ownership of
such Shares shall pass,  whether by operation  of law or  otherwise,  including,
without  limitation,  the  Stockholder's  heirs,  guardians,  administrators  or
successors,  provided,  that following the Effective  Time, this Agreement shall
not be binding on any  purchaser of Shares in a  transaction  made in compliance
with Section 4(b), other than Permitted Transfers.  Notwithstanding any transfer
of  Shares,  the  transferor  shall  remain  liable for the  performance  of all
obligations under this Agreement of the transferor.

               (c) Change in Control. In the event that after the Effective Time
(i) any Person or group of Persons  acting in  concert  (as  defined in the City
Code on Take-overs  and Mergers in the United  Kingdom)  acquires an interest in
the equity share capital of Cordiant (an  "Acquiring  Person") and,  immediately
following such  acquisition,  such person,  or group,  holds shares  entitled to
exercise  more than 50% of the votes  which may be cast at a general  meeting of
Cordiant or (ii) a majority of the board of  directors  of Cordiant  immediately
prior  to  such  Person  becoming  an  Acquiring  Person,  cease  to  thereafter
constitute a majority of the board of directors of Cordiant  (other than through
elections of directors  whose  nomination  for election by the  shareholders  of
Cordiant  were  approved by the vote of a majority of  directors of Cordiant who
were either  directors prior to a Person  becoming an Acquiring  Person or whose
election or  nomination  for  election  was so  previously  approved),  then the
restrictions on Dispositions contained in Section 4, shall terminate without any
action on the part of any party hereto.

               (d) Assignment. This Agreement shall not be assigned by operation
of law or  otherwise  without  the prior  written  consent  of the other  party,
provided,  that Cordiant or Sub may assign,  in its sole discretion,  its rights
and obligations  hereunder to any direct or indirect wholly owned  subsidiary of
Cordiant,  but  no  such  assignment  shall  relieve  Cordiant  or  Sub  of  its
obligations  hereunder  if  such  assignee  does  not  or  cannot  perform  such
obligations.

               (e) Amendments,  Waivers, Etc. This Agreement may not be amended,
changed,  supplemented,  waived or otherwise modified or terminated, except upon
the  execution and delivery of a written  agreement  executed by the party to be
charged thereby or, with respect to termination, as otherwise provided herein.

               (f) Notices.  All notices,  requests,  claims,  demands and other
communications  hereunder  shall be in writing  and shall be given (and shall be
deemed to have been duly received if so given) by hand delivery, telegram, telex
or telecopy,  or by mail (registered or certified mail, postage prepaid,  return
receipt requested) or by any courier service, such as Federal Express, providing
proof of  delivery.  All  communications  hereunder  shall be  delivered  to the
respective parties at the following addresses:

         If to the Stockholder:     William Butler
                                    c/o Healthworld Corporation
                                    100 Avenue of the Americas
                                    New York, New York 10010
                                    Facsimile: (212) 966-2743

         and

         If to Cordiant or
         Sub to:                    Cordiant Communications Group plc
                                    121-141 Westbourne Terrace
                                    London W2 6JR
                                    Deputy Finance Director
                                    Facsimile: +44-171-262-4300

         copy to:                   White & Case LLP
                                    1155 Avenue of the Americas
                                    New York, New York  10036-2787
                                    Attention:  Timothy B. Goodell, Esq.
                                    Facsimile:  (212) 354-8113

or to such  other  address  as the  person  to whom  notice  is  given  may have
previously furnished to the others in writing in the manner set forth above.

               (g) Severability. Whenever possible, each provision or portion of
any  provision of this  Agreement  will be  interpreted  in such manner as to be
effective and valid under  applicable law but if any provision or portion of any
provision of this Agreement is held to be invalid,  illegal or  unenforceable in
any  respect  under  any  applicable  law  or  rule  in any  jurisdiction,  such
invalidity,  illegality or unenforceability  will not affect any other provision
or portion of any provision in such  jurisdiction,  and this  Agreement  will be
reformed,  construed  and  enforced  in such  jurisdiction  as if such  invalid,
illegal or  unenforceable  provision or portion of any  provision had never been
contained herein.

               (h) Specific  Performance.  Each of the parties hereto recognizes
and acknowledges that a breach by it of any covenants or agreements contained in
this  Agreement will cause the aggrieved  party to sustain  damages for which it
would not have an adequate  remedy at law for money damages,  and therefore each
of the parties  hereto agrees that in the event of any such breach the aggrieved
party shall be entitled to the remedy of specific  performance of such covenants
and  agreements and  injunctive  and other  equitable  relief in addition to any
other remedy to which it may be entitled, at law or in equity.

               (i) Remedies Cumulative. All rights, powers and remedies provided
under this  Agreement  or  otherwise  available  in respect  hereof at law or in
equity shall be cumulative and not alternative,  and the exercise of any thereof
by any party shall not preclude the  simultaneous or later exercise of any other
such right, power or remedy by such party.

               (j) No Waiver.  The failure of any party  hereto to exercise  any
right,  power or remedy provided under this Agreement or otherwise  available in
respect  hereof at law or in equity,  or to insist upon  compliance by any other
party hereto with its obligations  hereunder,  and any custom or practice of the
parties at variance with the terms hereof, shall not constitute a waiver by such
party of its right to exercise  any such or other  right,  power or remedy or to
demand such compliance.

               (k) No Third Party Beneficiaries.  This Agreement is not intended
to be for the benefit of, and shall not be enforceable  by, any person or entity
who or which is not a party hereto.

               (l) Governing Law. This Agreement shall be governed and construed
in accordance  with the laws of the State of New York,  without giving effect to
the principles of conflicts of law thereof.

               (m) Jurisdiction.  Each party hereby  irrevocably  submits to the
exclusive  jurisdiction of the Court of Chancery in the State of Delaware or the
United States District Court for the Southern  District of New York or any court
of the State of New York located in the City of New York in any action,  suit or
proceeding  arising in connection with this Agreement,  and agrees that any such
action,  suit or proceeding  shall be brought only in such court (and waives any
objection  based  on  forum  non  conveniens  or any  other  objection  to venue
therein); provided, however, that such consent to jurisdiction is solely for the
purpose  referred  to in this  paragraph  (1) and  shall  not be  deemed to be a
general  submission  to the  jurisdiction  of said  Courts  or in the  States of
Delaware  or New York other than for such  purposes.  Each party  hereto  hereby
waives any right to a trial by jury in connection with any such action,  suit or
proceeding.

               (n) Descriptive  Headings.  The descriptive  headings used herein
are inserted for  convenience  of reference only and are not intended to be part
of or to affect the meaning or interpretation of this Agreement.

               (o) Counterparts. This Agreement may be executed in counterparts,
each of  which  shall be  deemed  to be an  original,  but all of  which,  taken
together, shall constitute one and the same Agreement.


                         [SIGNATURES BEGIN ON NEXT PAGE]




<PAGE>


         IN WITNESS WHEREOF,  Cordiant, Sub and the Stockholder have caused this
Agreement to be duly executed as of the day and year first above written.


                                         CORDIANT COMMUNICATIONS GROUP PLC


                                         By: /s/ Arthur D'Angelo
                                            -----------------------------
                                            Name:  Arthur D'Angelo
                                            Title: Finance Director



                                         HEALTHWORLD ACQUISITION CORP.


                                         By: /s/ Arthur D'Angelo
                                            -----------------------------
                                            Name:  Arthur D'Angelo
                                            Title: President



                                         /s/ William Butler
                                         --------------------------------
                                         William Butler


<PAGE>



              Schedule B to Stockholder Agreement of William Butler



               William Butler has pledged  485,070 of his Shares as security for
a loan obligation.







                                                                       EXHIBIT 3


                              STOCKHOLDER AGREEMENT


         AGREEMENT dated November 9, 1999, among Cordiant  Communications  Group
plc,  a company  organized  under the laws of  England  and Wales  ("Cordiant"),
Healthworld Acquisition Corporation,  a Delaware corporation and a direct wholly
owned subsidiary of Cordiant ("Sub"), and Herbert Ehrenthal (the "Stockholder").

                              W I T N E S S E T H:

         WHEREAS,   concurrently  herewith,   Cordiant,   Sub,  and  Healthworld
Corporation,  a Delaware  corporation  (the  "Company"),  are  entering  into an
Agreement  and Plan of Merger (as such  agreement  may hereafter be amended from
time to time, the "Merger Agreement"), pursuant to which Sub will be merged with
and into the Company and the Company shall continue as the surviving corporation
(the "Merger");

         Whereas,  the  Stockholder  Beneficially  Owns,  as of the date hereof,
313,252 shares (the "Shares") of common stock,  $.01 par value per share, of the
Company (the "Common Stock"); and

         WHEREAS,  as an inducement  and a condition to entering into the Merger
Agreement,  Cordiant and Sub have required that the Stockholder  agree,  and the
Stockholder has agreed, to enter into this Agreement;

         NOW,  THEREFORE,  in  consideration  of the  foregoing  and the  mutual
premises,  representations,   warranties,  covenants  and  agreements  contained
herein,  the parties  hereto,  intending  to be legally  bound,  hereby agree as
follows:

         1. Definitions. Unless other defined herein, all capitalized terms used
herein shall have the meanings given to such terms in the Merger Agreement.  For
purposes of this Agreement:

                  (a) "Beneficially Own" or "Beneficial  Ownership" with respect
to any securities  shall mean having  "beneficial  ownership" of such securities
(as determined pursuant to Rule 13d-3 under the Securities Exchange Act of 1934,
as  amended  (the  "Exchange  Act")),   including  pursuant  to  any  agreement,
arrangement or understanding, whether or not in writing.

         Without duplicative counting of the same securities by the same holder,
securities  Beneficially Owned by a Person shall include securities Beneficially
Owned by all other  Persons with whom such Person would  constitute a "group" as
within the meanings of Section 13(d)(3) of the Exchange Act.

                  (b) "Exchange Rate" means the average  currency  exchange rate
of pounds  sterling to US dollars based upon noon buying rate in the City of New
York for cable  transfers  in foreign  currencies  as  announced  by the Federal
Reserve Bank of New York for customs  purposes over the 10  consecutive  Trading
Days  ending on the day on which the Stock  Options  are  exercised  pursuant to
Section 3.

                  (c)  "Parent  Share  Value"  shall mean the product of (x) the
average of the closing  middle market  quotation of a Parent Share on the LSE as
reported in the Daily Official List of the London Stock Exchange for each of the
ten  consecutive  Trading Days ending on the day on which the Stock  Options are
exercised pursuant to Section 3 multiplied by (y) Exchange Rate.

                  (d) "Parent  Shares"  shall mean the ordinary  shares,  with a
nominal  value  of U.K.  fifty  pence  each  ("Ordinary  Shares"),  of  Cordiant
(including  any  options or other  rights to receive  Ordinary  Shares)  and the
American Depositary Shares, each representing the right to receive five Ordinary
Shares ("ADSs").

                  (e)   "Person"   shall   mean  an   individual,   corporation,
partnership,  limited  liability  company,  joint venture,  association,  trust,
unincorporated organization or other entity.

                  (f) "Share Value" shall be determined as follows:

                    (i) if the Parent  Share  Value is equal to or greater  than
               $2.5054 and equal to or less than $3.4838,  the Share Value shall
               be $20.00;

                    (ii) if the Parent Share Value is greater than $3.4838,  the
               Share Value shall be $23.00; and

                    (iii) if the Parent  Share Value is less than  $2.5054,  the
               Share Value shall be $17.00

                  (g) "Trading Day" shall mean any day on which  securities  are
traded,  with  respect to ADSs,  on the New York Stock  Exchange,  Inc. and with
respect to Ordinary Shares, on the London Stock Exchange Limited.

         2.   Provisions  Concerning  Common Stock.  (a) The Stockholder  hereby
agrees that during the period  described in clause (b) below,  at any meeting of
the holders of Common Stock of the Company,  however  called,  or in  connection
with any written  consent of the  holders of Common  Stock of the  Company,  the
Stockholder  shall vote (or cause to be voted) the Shares of Common Stock of the
Company,  (i) in favor of the Merger,  the execution and delivery by the Company
of the Merger  Agreement  and the approval of the terms  thereof and each of the
other actions  contemplated  by the Merger  Agreement and this Agreement and any
actions required in furtherance  thereof and hereof;  (ii) against any action or
agreement that would result in a breach in any material respect of any covenant,
representation  or warranty or any other  obligation or agreement of the Company
under the Merger  Agreement  or this  Agreement;  and (iii)  except as otherwise
agreed to in writing  in advance by  Cordiant,  against  the  following  actions
(other  than  the  Merger  and  the  transactions  contemplated  by  the  Merger
Agreement):  (A) any  extraordinary  corporate  transaction,  such as a  merger,
consolidation  or  other  business  combination  involving  the  Company  or its
Subsidiaries;  (B) a sale,  lease or transfer of a material  amount of assets of
the  Company  or  its  Subsidiaries,  or  a  reorganization,   recapitalization,
dissolution or liquidation of the Company or its Subsidiaries; (C) any change in
a majority of the persons who  constitute the board of directors of the Company;
(D) any change in the present  capitalization of the Company or any amendment of
the Company's  Certificate of  Incorporation  or Bylaws;  (E) any other material
change in the Company's corporate structure or business; or (F) any other action
involving the Company or its Subsidiaries which is intended, or could reasonably
be  expected,  to  materially  impede,   interfere  with,  delay,  postpone,  or
materially adversely affect the Merger and the transactions contemplated by this
Agreement and the Merger  Agreement.  The  Stockholder  shall not enter into any
agreement  or  understanding  with any  Person  the  effect  of  which  would be
inconsistent  with or violative of the provisions  and  agreements  contained in
this Section 2.

         (b) The  obligations  of the  Stockholders  under clauses (i), (ii) and
(iii)(C),  (D), (E) and (F) of this Section 2 shall  terminate on the earlier to
occur of the  Effective  Time and the  termination  of the Merger  Agreement  in
accordance  with its terms.  The  obligations  of the  Stockholder  under clause
(iii)(A)  and (B) of this  Section 2 shall  terminate on the earlier to occur of
the Effective Time and 120 days after the termination of the Merger Agreement in
accordance  with its terms (unless the Merger  Agreement is terminated by reason
of the  failure  to  obtain  Parent  Shareholders'  Approval  in which  case the
Stockholder's  obligations  under this Section 2 shall terminate  simultaneously
with the termination of the Merger Agreement).

         3.   Option to Purchase.  In order to induce  Cordiant and Sub to enter
into the Merger Agreement,  the Stockholder  hereby grants to Sub an irrevocable
option (the "Stock  Options")  to  purchase,  all, and not less than all, of the
Shares at a purchase  price per share equal to the Share Value,  payable in cash
(the  "Purchase  Price"),  solely upon, and subject to, the terms and conditions
set forth below.  The Stock Options may only be exercised if Sub  simultaneously
exercises  all other  options held by it to purchase all, and not less than all,
of the shares of Common Stock covered by such  options.  The Stock Options shall
become  exercisable  solely in the event that the Merger Agreement is terminated
pursuant  to (i)  Section  9.1(b)(ii)  thereof,  but only if the  basis for such
termination  is the failure to obtain the Company  Stockholder  Approval or (ii)
Section  9.1(b)(iii)  thereof,  but only if the basis for such  termination is a
breach by the Company,  or the  Stockholder  materially  breaches any  agreement
contained in this Agreement, in which event the Stock Options shall, in any such
case, become immediately exercisable at any time and from time to time upon such
termination or upon Cordiant and Sub being informed of such breach,  as the case
may be, and until the date  which is 20 days after the date of such  termination
or the date on which  Cordiant and Sub are informed of such breach,  as the case
may be,  provided,  that if at the  expiration  of such 20-day  period the Stock
Options cannot be exercised by reason of any preliminary or final  injunction or
other order issued by any court or  governmental,  administrative  or regulatory
agency or authority  prohibiting  the exercise of the Stock Options  pursuant to
this  Agreement,  or because all  waiting  periods  under the  Hart-Scott-Rodino
Antitrust Improvements Act of 1976, as amended (the "HSR ACT"), required for the
purchase of the Shares upon such exercise shall not have expired or been waived,
the Stock Options shall be exercisable until 10 business days after the later of
the date on which such  impediment to exercise  shall have been removed or shall
have become final and not subject to appeal.  In all other instances,  the Stock
Options shall  terminate upon the  termination of the Merger  Agreement.  In the
event that Cordiant wishes to exercise the Stock Options,  Cordiant shall send a
written notice (the "Notice") to the  Stockholder  identifying  the place (which
shall be in New York City for each  Stockholder  who is a resident of the United
States  and in London  for each  Stockholder  who is a  resident  of the  United
Kingdom) and date (not less than two business days nor greater than ten business
days from the date of the  Notice)  for the  closing of such  purchase.  At such
closing,  Cordiant shall receive  certificates for the Shares, duly endorsed for
transfer,  and shall make  payment  therefor  by wire  transfer  of  immediately
available funds.

         4.   Disposition of Parent Shares.

               (a) Restrictions on Disposition.  The Stockholder  hereby agrees,
except as permitted in this Section 4(a) and Section 4(b) below, not to directly
or indirectly,  offer to sell, contract to sell,  transfer,  assign, cause to be
redeemed or otherwise sell or dispose of any of the Parent Shares  (collectively
a  "Disposition")  received by the  stockholder  in  connection  with the Merger
without the prior written consent of Cordiant.  Notwithstanding  anything to the
contrary  provided in this Agreement,  the  Stockholder  shall have the right to
transfer Parent Shares (i) to any Family Member, (ii) to the trustee or trustees
of a trust solely  (except for remote  contingent  interests) for the benefit of
the  Stockholder   and/or  one  or  more  Family  Members  and/or  a  charitable
organization  (a  "Family  Member  Trust"),  (iii) to a  foundation  created  or
established by the Stockholder, or any other charitable organization,  (iv) to a
corporation of which the Stockholder  and/or any Family Member and/or any Family
Member  Trust  owns  all of the  outstanding  capital  stock,  (v) to a  limited
liability  company of which the Stockholder  and/or any Family Member and/or any
Family Member Trust owns all of the outstanding membership interests,  (vi) to a
partnership of which the Stockholder  and/or any Family Member and/or any Family
Member  Trust  owns all of the  partnership  interests,  (vii) to the  executor,
administrator or personal representative of the estate of the Stockholder or any
other Family Member, or (viii) to any guardian, trustee or conservator appointed
with respect to the assets of the Stockholder, provided, that in the case of any
such  transfer,  the  transferee  shall  execute an agreement to be bound by the
terms of this  Agreement  (each  such  transfer,  a  "Permitted  Transfer"  and,
collectively,  the  "Permitted  Transfers").  For  purposes  of this  Agreement,
"Family  Member"  shall mean (a) the  Stockholder's  spouse,  if living with the
Stockholder,  (b) any one of the following:  the Stockholder's  father,  mother,
issue,  brother  or sister,  and the issue of a brother  or sister,  and (c) the
spouse of any  Family  Member  described  in (b) above,  if the spouse  shall be
living with that Family Member.  The  Stockholder  hereby agrees and consents to
the entry of stop transfer  instructions with Cordiant's  transfer agent against
the transfer of such Parent  Shares except in  compliance  with this  Agreement.
Notwithstanding  the  foregoing,  the  Stockholder  may pledge,  hypothecate  or
otherwise  grant a security  interest  in all or a portion of the Parent  Shares
beneficially owned by him during the term of this Agreement;  provided, however,
that any Person  receiving  such  Parent  Shares  shall be subject to all of the
restrictions  on  Disposition of such Parent Shares imposed by this Agreement to
the same extent as the Stockholder.

               (b) Permitted  Dispositions.  The  Stockholder may not effect any
Disposition of Parent Shares  received by the Stockholder in connection with the
Merger  except as  follows:  (i)  during  the  twelve-month  period  immediately
following the Effective Time the  Stockholder  may effect the Disposition of not
more than 30% of the Parent Shares  Beneficially  Owned by the  Stockholder  and
(ii) during the  twenty-four-month  period  immediately  following the Effective
Time (the "Period"), the Stockholder may effect the Disposition of not more than
65% of the  Parent  Shares  Beneficially  Owned  by the  Stockholder.  Upon  the
expiration of the Period,  the Stockholder may effect the Dispositions of all or
any  portion  of the  Parent  Shares  Beneficially  Owned by him  subject to any
applicable  restrictions  under the Federal  Securities Law and  restrictions of
general  application  under  English law, the Listing  Rules of the London Stock
Exchange,  if applicable,  and  Cordiant's  policies made pursuant to such rules
regarding  dealings in Parent  Shares by  directors  and  relevant  employees of
Cordiant and its subsidiaries,  if applicable.  Notwithstanding  anything to the
contrary contained in this Section 4, the Stockholder hereby agrees that for the
period commencing at the Effective Time and ending on the date which is 180 days
after the  expiration  of the  Period,  the  Stockholder  shall give  Cordiant 1
business day prior written  notice of any intended  Disposition of Parent Shares
to be made by the  Stockholder  and at the request of Cordiant  agrees to effect
such Disposition through brokers or other financial intermediaries designated by
Cordiant to maintain an orderly  trading market for the Parent Shares,  provided
that  such  financial   intermediary  agrees  to  effect  and  does  effect  the
Disposition in a reasonable period following such notice.

         5.   Representations and Warranties of the Stockholder. The Stockholder
hereby represents and warrants to each of Cordiant and Sub as follows:

               (a) Ownership of Shares.  The Stockholder is the record holder of
or Beneficially Owns the Shares.  On the date hereof,  the Shares constitute all
of the  shares of Common  Stock  owned of  record or  Beneficially  Owned by the
Stockholder  (excluding  any Stock Options (as defined in the Merger  Agreement)
held by the  Stockholder).  The Stockholder has sole voting power and sole power
to issue instructions with respect to the matters set forth in Section 2 hereof,
sole power of  disposition,  sole power of  conversion,  sole power to  exercise
dissenters'  rights and sole power to agree to all of the  matters  set forth in
this  agreement,  in  each  case  with  respect  to all of the  Shares,  with no
limitations,   qualifications  or  restrictions  on  such  rights,   subject  to
applicable securities laws and the terms of this Agreement.

               (b)  Power;  Binding  Agreement.  The  Stockholder  has the legal
capacity,  power and authority to enter into and perform all of his  obligations
under this Agreement. The execution,  delivery and performance of this Agreement
by the Stockholder will not violate any other Agreement to which the Stockholder
is a party including,  without  limitation,  any voting agreement,  shareholders
agreement or voting trust. This Agreement has been duly and validly executed and
delivered by the Stockholder  and  constitutes a valid and binding  agreement of
the  Stockholder,  enforceable  against the  Stockholder in accordance  with its
terms  except  that  such  enforceability  (i)  may be  limited  by  bankruptcy,
insolvency,  moratorium  or other similar laws  relating to the  enforcement  of
creditors' rights generally and (ii) is subject to general  principles of equity
and  discretion  of the court before which any  proceedings  seeking  injunctive
relief or specific  performance may be sought. There is no beneficiary or holder
of a voting  trust  certificate  or other  interest  of any  trust of which  the
Stockholder  is trustee whose consent is required for the execution and delivery
of this agreement or the  consummation  by the  Stockholder of the  transactions
contemplated  hereby. If the Stockholder is married and the Stockholder's Shares
constitute community property, this agreement has been duly authorized, executed
and  delivered  by,  and  constitutes  a valid and  binding  agreement  of,  the
Stockholder's  spouse,  enforceable  against such Person in accordance  with its
terms  except  that  such  enforceability  (i)  may be  limited  by  bankruptcy,
insolvency,  moratorium  or other similar laws  relating to the  enforcement  of
creditors' rights generally and (ii) is subject to general  principles of equity
and  discretion  of the court before which any  proceedings  seeking  injunctive
relief or specific performance may be sought.

               (c) No Conflicts.  Except for filings,  permits,  authorizations,
consents and  approvals  under the HSR Act and the  Securities  Act of 1933,  if
applicable,  (A) no  filing  with,  and no  permit,  authorization,  consent  or
approval of, any state or federal  public body or authority is necessary for the
execution  of this  Agreement by the  Stockholder  and the  consummation  by the
Stockholder  of  the  transactions  contemplated  hereby  and  (B)  none  of the
execution and delivery of this Agreement by the Stockholder, the consummation by
the  Stockholder of the  transactions  contemplated  hereby or compliance by the
Stockholder with any of the provisions  hereof shall, in a manner which would be
material  and  adverse  to the  ability of the  Stockholder  to  consummate  the
transactions contemplated hereby or to comply with the terms hereof, result in a
violation or breach of, or constitute  (with or without  notice or lapse of time
or both) a  default  (or give  rise to any  third  party  right of  termination,
cancellation,  material  modification or  acceleration)  under any of the terms,
conditions  or  provisions  of any note,  bond,  mortgage,  indenture,  license,
contract, commitment, arrangement,  understanding, agreement or other instrument
or  obligation of any kind to which the  Stockholder  is a party or by which the
Stockholder or any of the  Stockholder's  properties or assets may be bound,  or
(3) violate any order, writ, injunction,  decree, judgment, order, statute, rule
or  regulation  applicable  to the  Stockholder  or  any  of  the  Stockholder's
properties or assets.

               (d) No Encumbrances.  Except as applicable in connection with the
transactions  contemplated hereby or as set forth on Schedule B attached hereto,
the  Shares and the  certificates  representing  the Shares are now,  and at all
times during the term hereof will be, held by the  Stockholder,  or by a nominee
or custodian  for the benefit of the  Stockholder,  free and clear of all liens,
claims, security interests, proxies, voting trusts or agreements, understandings
or  arrangements  or any  other  encumbrances  whatsoever,  except  for any such
encumbrances or proxies arising hereunder in favor of Cordiant.

               (e) No Finder's  Fees. No broker,  investment  banker,  financial
adviser  or other  person  is  entitled  to any  broker's,  finder's,  financial
adviser's or other similar fee or commission in connection with the transactions
contemplated  hereby  based  upon  arrangements  made  by or on  behalf  of  the
Stockholder  other than Bear Stearns & Co. Inc.,  the fees and expenses of which
shall be paid by the Company.

               (f) Reliance by Cordiant and Sub. The Stockholder understands and
acknowledges  that  Cordiant and Sub are entering  into the Merger  Agreement in
reliance upon the Stockholder's execution and delivery of this Agreement.

         6.   Additional  Covenants of the Stockholder.  The Stockholder  hereby
covenants to each of Cordiant and Sub as follows:

               (a) No  Solicitation.  Subject  to the  provisions  contained  in
Section 10 of this  Agreement,  the  Stockholder  shall not, in his  capacity as
such,   directly  or  indirectly,   solicit  (including  by  way  of  furnishing
information)  or respond to any  inquiries  or the making of any proposal by any
Person or entity (other than Cordiant or any affiliate of Cordiant) with respect
to the Company that constitutes a Takeover Proposal. If the Stockholder receives
any such  inquiry  or  proposal,  then the  Stockholder  shall  promptly  inform
Cordiant of the existence  thereof.  The Stockholder will immediately  cease and
cause to be terminated any existing activities, discussions or negotiations with
any parties conducted heretofore with respect to any of the foregoing.

               (b)   Restriction   on   Transfer   of   Shares,    Proxies   and
Non-Interference.  Beginning on the date hereof and ending on the later to occur
of (A) last date the Stock Options are exercisable  pursuant to Section 3 hereof
and (B) the date that all of the Stockholder's  obligations under Section 2 have
terminated, except as contemplated by this Agreement or the Merger Agreement, no
Stockholder shall,  directly or indirectly,  (i) offer for sale, sell, transfer,
tender,  pledge,  encumber,  assign or  otherwise  dispose of, or enter into any
contract,  option or other  arrangement  or  understanding  with  respect  to or
consent to the offer for sale,  sale,  transfer,  tender,  pledge,  encumbrance,
assignment  or other  disposition  of, any or all of the Shares or any  interest
therein;  (ii) except as contemplated  by this  Agreement,  grant any proxies or
powers of attorney,  deposit any of the Shares into a voting trust or enter into
a voting  agreement with respect to any of the Shares;  or (iii) take any action
that would make any  representation  or  warranty of the  Stockholder  contained
herein  untrue or incorrect or have the effect of  preventing  or disabling  the
Stockholder from performing the Stockholder's  obligations under this Agreement.
Notwithstanding   anything  to  the  contrary  provided  in  this  Agreement,  a
Stockholder  shall have the right to make  Permitted  Transfers  of Shares.  The
Stockholder agrees with, and covenants to, Sub that beginning on the date hereof
and  ending on the last date the  Stock  Options  are  exercisable  pursuant  to
Section 3 hereof,  the Stockholder  shall not request that the Company  register
the transfer  (book-entry  or otherwise) of any  certificate  or  uncertificated
interest  representing  any of the  Shares,  unless  such  transfer  is  made in
compliance with this Agreement (including the provisions of Section 2 hereof).

               (c)  Additional  Shares.  The  Stockholder  agrees,   while  this
Agreement is in effect (i) to notify  Cordiant and Sub promptly of the number of
any shares of Common  Stock  acquired by the  Stockholder  after the date hereof
(the "Additional  Shares") and (ii) to vote such Additional Shares in accordance
with Section 2 hereof. Such Additional Shares shall also be subject to the Stock
Option granted to Sub pursuant to Section 3 hereof and the restriction contained
in Section 6(b)(i) and (ii) above.

         7.   Representations  and Warranties of Cordiant and Sub.  Cordiant and
Sub hereby  covenant,  represent  and  warrant to the  Stockholder  that each of
Cordiant and Sub has the legal  capacity,  power and authority to enter into and
perform all of such party's  obligations  under this  Agreement;  the execution,
delivery and  performance of this Agreement by Cordiant and Sub will not violate
or result in a breach of any other  material  agreement to which Cordiant or Sub
is a party; the execution and delivery of this Agreement and the consummation of
the transactions  contemplated hereby (i) have been duly authorized by the board
of  directors  of  Cordiant  and Sub,  and (ii) do not and will not  violate any
provision of the certificate of incorporation or by-laws of Cordiant or Sub; and
this  Agreement  has been duly and validly  executed  and  delivered  by each of
Cordiant and Sub and  constitutes  a valid and binding  agreement of such party,
enforceable against such party in accordance with its terms.

         8.  Further Assurances. From time to time, at the other party's request
and without further  consideration,  each party hereto shall execute and deliver
such additional reasonable documents and take all such further reasonable lawful
action as may be necessary or desirable to consummate and make effective, in the
most  expeditious  manner  practicable,  the  transactions  contemplated by this
Agreement.

         9.   Termination;  Expenses and Fee. (a) The covenants  and  agreements
contained herein with respect to the Shares shall terminate (i) in the event the
Merger  Agreement  is  terminated  in  accordance  with  its  terms,  upon  such
termination,  except that the  provisions of Sections 2, 3 and 6(b) hereof shall
survive any such  termination  solely in accordance with their terms and (ii) in
the event the Merger is  consummated,  at the  Effective  Time,  except that the
provisions of Section 4 hereof shall survive any such termination,  provided, in
each case, that the provisions of Section 12 and Section 13 hereof shall survive
any termination of this Agreement, and provided, further, that no termination of
this Agreement shall relieve any party of liability for a breach hereof.

               (b) Each party  shall bear its own  expenses in  connection  with
this Agreement and the transactions contemplated hereby.

         10.  Stockholder  Capacity.  The  Stockholder  is  not  executing  this
Agreement and does not make any agreement or understanding  herein in his or her
capacity as a director or officer of the  Company and nothing  contained  herein
shall limit or affect any actions taken by the  Stockholder in his capacity as a
director or officer of the Company to the extent such action is permitted by, or
not  prohibited  by,  the  Merger  Agreement,  and none of such  actions in such
capacities  shall be  deemed  to  constitute  a breach  of this  Agreement.  The
Stockholder  signs solely in his capacity as the record and beneficial owner of,
or the trustee of a trust whose  beneficiaries are the beneficial owners of, the
Shares.

         11. Sophistication. The Stockholder acknowledges that he is an informed
and sophisticated  investor and, together with his advisors, has undertaken such
investigation as they have deemed necessary,  including the review of the Merger
Agreement and this Agreement,  to enable the Stockholder to make an informed and
intelligent decision with respect to the Merger Agreement and this Agreement and
the transactions contemplated thereby and hereby.

         12.  Confidentiality.  Each  of  the  parties  hereto  recognizes  that
successful  consummation of the transactions  contemplated by this Agreement may
be  dependent  upon  confidentiality  with  respect to the  matters  referred to
herein. In this connection, pending public disclosure thereof, each party hereby
agrees not to disclose or discuss  such  matters with anyone not a party to this
Agreement or the Merger Agreement (other than such party's counsel and advisors,
if any) without the prior written consent of the other party, except for filings
required  pursuant to the Exchange Act and the rules and regulations  thereunder
or disclosures  such party's  counsel  advises are necessary in order to fulfill
such  party's  obligations  imposed by law, in which event such party shall give
notice of such disclosure to the other party as promptly as practicable so as to
enable the other  party to seek a  protective  order  from a court of  competent
jurisdiction with respect thereto.

         13.   Miscellaneous.

               (a) Entire  Agreement.  This  Agreement and the Merger  Agreement
constitute the entire agreement  between the parties with respect to the subject
matter hereof and supersede all other prior agreements and understandings,  both
written and oral, between the parties with respect to the subject matter hereof.

               (b) Certain Events.  The  Stockholder  agrees that this Agreement
and the obligations hereunder shall attach to the Stockholder's Shares and shall
be binding upon any person or entity to which legal or  beneficial  ownership of
such Shares shall pass,  whether by operation  of law or  otherwise,  including,
without  limitation,  the  Stockholder's  heirs,  guardians,  administrators  or
successors,  provided,  that following the Effective  Time, this Agreement shall
not be binding on any  purchaser of Shares in a  transaction  made in compliance
with Section 4(b), other than Permitted Transfers.  Notwithstanding any transfer
of  Shares,  the  transferor  shall  remain  liable for the  performance  of all
obligations under this Agreement of the transferor.

               (c) Change in Control. In the event that after the Effective Time
(i) any Person or group of Persons  acting in  concert  (as  defined in the City
Code on Take-overs  and Mergers in the United  Kingdom)  acquires an interest in
the equity share capital of Cordiant (an  "Acquiring  Person") and,  immediately
following such  acquisition,  such person,  or group,  holds shares  entitled to
exercise  more than 50% of the votes  which may be cast at a general  meeting of
Cordiant or (ii) a majority of the board of  directors  of Cordiant  immediately
prior  to  such  Person  becoming  an  Acquiring  Person,  cease  to  thereafter
constitute a majority of the board of directors of Cordiant  (other than through
elections of directors  whose  nomination  for election by the  shareholders  of
Cordiant  were  approved by the vote of a majority of  directors of Cordiant who
were either  directors prior to a Person  becoming an Acquiring  Person or whose
election or  nomination  for  election  was so  previously  approved),  then the
restrictions on Dispositions contained in Section 4, shall terminate without any
action on the part of any party hereto.

               (d) Assignment. This Agreement shall not be assigned by operation
of law or  otherwise  without  the prior  written  consent  of the other  party,
provided,  that Cordiant or Sub may assign,  in its sole discretion,  its rights
and obligations  hereunder to any direct or indirect wholly owned  subsidiary of
Cordiant,  but  no  such  assignment  shall  relieve  Cordiant  or  Sub  of  its
obligations  hereunder  if  such  assignee  does  not  or  cannot  perform  such
obligations.

               (e) Amendments,  Waivers, Etc. This Agreement may not be amended,
changed,  supplemented,  waived or otherwise modified or terminated, except upon
the  execution and delivery of a written  agreement  executed by the party to be
charged thereby or, with respect to termination, as otherwise provided herein.

               (f) Notices.  All notices,  requests,  claims,  demands and other
communications  hereunder  shall be in writing  and shall be given (and shall be
deemed to have been duly received if so given) by hand delivery, telegram, telex
or telecopy,  or by mail (registered or certified mail, postage prepaid,  return
receipt requested) or by any courier service, such as Federal Express, providing
proof of  delivery.  All  communications  hereunder  shall be  delivered  to the
respective parties at the following  addresses:

         If to the Stockholder:  Herbert Ehrenthal
                                 c/o  Healthworld  Corporation
                                 100 Avenue of the Americas
                                 New York, New York 10010
                                 Facsimile: (212) 966-2743

         and

         If to Cordiant or
         Sub to:                 Cordiant Communications Group plc
                                 121-141 Westbourne Terrace
                                 London W2 6JR
                                 Attention: Deputy Finance Director
                                 Facsimile: +44-171-262-4300

         copy to:                White & Case LLP
                                 1155 Avenue of the Americas
                                 New York, New York  10036-2787
                                 Attention:  Timothy B. Goodell, Esq.
                                 Facsimile:  (212) 354-8113

or to such  other  address  as the  person  to whom  notice  is  given  may have
previously furnished to the others in writing in the manner set forth above.

               (g) Severability. Whenever possible, each provision or portion of
any  provision of this  Agreement  will be  interpreted  in such manner as to be
effective and valid under  applicable law but if any provision or portion of any
provision of this Agreement is held to be invalid,  illegal or  unenforceable in
any  respect  under  any  applicable  law  or  rule  in any  jurisdiction,  such
invalidity,  illegality or unenforceability  will not affect any other provision
or portion of any provision in such  jurisdiction,  and this  Agreement  will be
reformed,  construed  and  enforced  in such  jurisdiction  as if such  invalid,
illegal or  unenforceable  provision or portion of any  provision had never been
contained herein.

               (h) Specific  Performance.  Each of the parties hereto recognizes
and acknowledges that a breach by it of any covenants or agreements contained in
this  Agreement will cause the aggrieved  party to sustain  damages for which it
would not have an adequate  remedy at law for money damages,  and therefore each
of the parties  hereto agrees that in the event of any such breach the aggrieved
party shall be entitled to the remedy of specific  performance of such covenants
and  agreements and  injunctive  and other  equitable  relief in addition to any
other remedy to which it may be entitled, at law or in equity.

               (i) Remedies Cumulative. All rights, powers and remedies provided
under this  Agreement  or  otherwise  available  in respect  hereof at law or in
equity shall be cumulative and not alternative,  and the exercise of any thereof
by any party shall not preclude the  simultaneous or later exercise of any other
such right, power or remedy by such party.

               (j) No Waiver.  The failure of any party  hereto to exercise  any
right,  power or remedy provided under this Agreement or otherwise  available in
respect  hereof at law or in equity,  or to insist upon  compliance by any other
party hereto with its obligations  hereunder,  and any custom or practice of the
parties at variance with the terms hereof, shall not constitute a waiver by such
party of its right to exercise  any such or other  right,  power or remedy or to
demand such compliance.

               (k) No Third Party Beneficiaries.  This Agreement is not intended
to be for the benefit of, and shall not be enforceable  by, any person or entity
who or which is not a party hereto.

               (l) Governing Law. This Agreement shall be governed and construed
in accordance  with the laws of the State of New York,  without giving effect to
the principles of conflicts of law thereof.

               (m) Jurisdiction.  Each party hereby  irrevocably  submits to the
exclusive  jurisdiction of the Court of Chancery in the State of Delaware or the
United States District Court for the Southern  District of New York or any court
of the State of New York located in the City of New York in any action,  suit or
proceeding  arising in connection with this Agreement,  and agrees that any such
action,  suit or proceeding  shall be brought only in such court (and waives any
objection  based  on  forum  non  conveniens  or any  other  objection  to venue
therein); provided, however, that such consent to jurisdiction is solely for the
purpose  referred  to in this  paragraph  (1) and  shall  not be  deemed to be a
general  submission  to the  jurisdiction  of said  Courts  or in the  States of
Delaware  or New York other than for such  purposes.  Each party  hereto  hereby
waives any right to a trial by jury in connection with any such action,  suit or
proceeding.

               (n) Descriptive  Headings.  The descriptive  headings used herein
are inserted for  convenience  of reference only and are not intended to be part
of or to affect the meaning or interpretation of this Agreement.

               (o) Counterparts. This Agreement may be executed in counterparts,
each of  which  shall be  deemed  to be an  original,  but all of  which,  taken
together, shall constitute one and the same Agreement.

                        [SIGNATURES BEGIN ON NEXT PAGE]

<PAGE>


               IN WITNESS WHEREOF, Cordiant, Sub and the Stockholder have caused
this Agreement to be duly executed as of the day and year first above written.


                                      CORDIANT COMMUNICATIONS GROUP PLC


                                      By: /s/ Arthur D'Angelo
                                          --------------------------------
                                          Name:  Arthur D'Angelo
                                          Title: Finance Director



                                      HEALTHWORLD ACQUISITION CORP.


                                      By: /s/ Arthur D'Angelo
                                          --------------------------------
                                          Name:  Arthur D'Angelo
                                          Title: President



                                      /s/ Herbert Ehrenthal
                                      ------------------------------------
                                      Herbert Ehrenthal


<PAGE>


            Schedule B to Stockholder Agreement of Herbert Ehrenthal



No exceptions.





                                                                       EXHIBIT 4


                              STOCKHOLDER AGREEMENT


         AGREEMENT dated November 9, 1999, among Cordiant  Communications  Group
plc,  a company  organized  under the laws of  England  and Wales  ("Cordiant"),
Healthworld Acquisition Corporation,  a Delaware corporation and a direct wholly
owned subsidiary of Cordiant ("Sub"), and Spencer Falk (the "Stockholder").

                              W I T N E S S E T H:

         WHEREAS,   concurrently  herewith,   Cordiant,   Sub,  and  Healthworld
Corporation,  a Delaware  corporation  (the  "Company"),  are  entering  into an
Agreement  and Plan of Merger (as such  agreement  may hereafter be amended from
time to time, the "Merger Agreement"), pursuant to which Sub will be merged with
and into the Company and the Company shall continue as the surviving corporation
(the "Merger");

         Whereas,  the  Stockholder  Beneficially  Owns,  as of the date hereof,
518,327 shares (the "Shares") of common stock,  $.01 par value per share, of the
Company (the "Common Stock"); and

         WHEREAS,  as an inducement  and a condition to entering into the Merger
Agreement,  Cordiant and Sub have required that the Stockholder  agree,  and the
Stockholder has agreed, to enter into this Agreement;

         NOW,  THEREFORE,  in  consideration  of the  foregoing  and the  mutual
premises,  representations,   warranties,  covenants  and  agreements  contained
herein,  the parties  hereto,  intending  to be legally  bound,  hereby agree as
follows:

         1. Definitions. Unless other defined herein, all capitalized terms used
herein shall have the meanings given to such terms in the Merger Agreement.  For
purposes of this Agreement:

                  (a) "Beneficially Own" or "Beneficial  Ownership" with respect
to any securities  shall mean having  "beneficial  ownership" of such securities
(as determined pursuant to Rule 13d-3 under the Securities Exchange Act of 1934,
as  amended  (the  "Exchange  Act")),   including  pursuant  to  any  agreement,
arrangement or understanding, whether or not in writing.

         Without duplicative counting of the same securities by the same holder,
securities  Beneficially Owned by a Person shall include securities Beneficially
Owned by all other  Persons with whom such Person would  constitute a "group" as
within the meanings of Section 13(d)(3) of the Exchange Act.

                  (b) "Exchange Rate" means the average  currency  exchange rate
of pounds  sterling  to US dollars as  published  in the noon buying rate in the
City of New York for cable  transfers in foreign  currencies as announced by the
Federal  Reserve Bank of New York for customs  purposes over the 10  consecutive
Trading Days ending on the day on which the Stock Options are exercised pursuant
to Section 3.

                  (c)  "Parent  Share  Value"  shall mean the product of (x) the
average of the closing  middle market  quotation of a Parent Share on the LSE as
reported in the Daily Official List of the London Stock Exchange for each of the
ten  consecutive  Trading Days ending on the day on which the Stock  Options are
exercised pursuant to Section 3 multiplied by (y) Exchange Rate.

                  (d) "Parent  Shares"  shall mean the ordinary  shares,  with a
nominal  value  of U.K.  fifty  pence  each  ("Ordinary  Shares"),  of  Cordiant
(including  any  options or other  rights to receive  Ordinary  Shares)  and the
American Depositary Shares, each representing the right to receive five Ordinary
Shares ("ADSs").

                  (e)   "Person"   shall   mean  an   individual,   corporation,
partnership,  limited  liability  company,  joint venture,  association,  trust,
unincorporated organization or other entity.

                  (f) "Share Value" shall be determined as follows:

                    (i) if the Parent  Share  Value is equal to or greater  than
               $2.5054 and equal to or less than $3.4838,  the Share Value shall
               be $20.00;

                    (ii) if the Parent Share Value is greater than  $3.4838, the
               Share Value shall be $23.00; and

                    (iii) if the Parent  Share Value is less than  $2.5054,  the
               Share Value shall be $17.00.

                  (g) "Trading Day" shall mean any day on which  securities  are
traded,  with  respect to ADSs,  on the New York Stock  Exchange,  Inc. and with
respect to Ordinary Shares, on the London Stock Exchange Limited.

          2.  Provisions  Concerning  Common Stock.  (a) The Stockholder  hereby
agrees that during the period  described in clause (b) below,  at any meeting of
the holders of Common Stock of the Company,  however  called,  or in  connection
with any written  consent of the  holders of Common  Stock of the  Company,  the
Stockholder  shall vote (or cause to be voted) the Shares of Common Stock of the
Company,  (i) in favor of the Merger,  the execution and delivery by the Company
of the Merger  Agreement  and the approval of the terms  thereof and each of the
other actions  contemplated  by the Merger  Agreement and this Agreement and any
actions required in furtherance  thereof and hereof;  (ii) against any action or
agreement that would result in a breach in any material respect of any covenant,
representation  or warranty or any other  obligation or agreement of the Company
under the Merger  Agreement  or this  Agreement;  and (iii)  except as otherwise
agreed to in writing  in advance by  Cordiant,  against  the  following  actions
(other  than  the  Merger  and  the  transactions  contemplated  by  the  Merger
Agreement):  (A) any  extraordinary  corporate  transaction,  such as a  merger,
consolidation  or  other  business  combination  involving  the  Company  or its
Subsidiaries;  (B) a sale,  lease or transfer of a material  amount of assets of
the  Company  or  its  Subsidiaries,  or  a  reorganization,   recapitalization,
dissolution or liquidation of the Company or its Subsidiaries; (C) any change in
a majority of the persons who  constitute the board of directors of the Company;
(D) any change in the present  capitalization of the Company or any amendment of
the Company's  Certificate of  Incorporation  or Bylaws;  (E) any other material
change in the Company's corporate structure or business; or (F) any other action
involving the Company or its Subsidiaries which is intended, or could reasonably
be  expected,  to  materially  impede,   interfere  with,  delay,  postpone,  or
materially adversely affect the Merger and the transactions contemplated by this
Agreement and the Merger  Agreement.  The  Stockholder  shall not enter into any
agreement  or  understanding  with any  Person  the  effect  of  which  would be
inconsistent  with or violative of the provisions  and  agreements  contained in
this Section 2.

         (b) The  obligations  of the  Stockholders  under clauses (i), (ii) and
(iii)(C),  (D), (E) and (F) of this Section 2 shall  terminate on the earlier to
occur of the  Effective  Time and the  termination  of the Merger  Agreement  in
accordance  with its terms.  The  obligations  of the  Stockholder  under clause
(iii)(A)  and (B) of this  Section 2 shall  terminate on the earlier to occur of
the Effective Time and 120 days after the termination of the Merger Agreement in
accordance  with its terms (unless the Merger  Agreement is terminated by reason
of the  failure  to  obtain  Parent  Shareholders'  Approval  in which  case the
Stockholder's  obligations  under this Section 2 shall terminate  simultaneously
with the termination of the Merger Agreement).

         3.   Option to Purchase.  In order to induce  Cordiant and Sub to enter
into the Merger Agreement,  the Stockholder  hereby grants to Sub an irrevocable
option (the "Stock  Options")  to  purchase,  all, and not less than all, of the
Shares at a purchase  price per share equal to the Share Value,  payable in cash
(the  "Purchase  Price"),  solely upon, and subject to, the terms and conditions
set forth below.  The Stock Options may only be exercised if Sub  simultaneously
exercises  all other  options held by it to purchase all, and not less than all,
of the shares of Common Stock covered by such  options.  The Stock Options shall
become  exercisable  solely in the event that the Merger Agreement is terminated
pursuant  to (i)  Section  9.1(b)(ii)  thereof,  but only if the  basis for such
termination  is the failure to obtain the Company  Stockholder  Approval or (ii)
Section  9.1(b)(iii)  thereof,  but only if the basis for such  termination is a
breach by the Company,  or the  Stockholder  materially  breaches any  agreement
contained in this Agreement, in which event the Stock Options shall, in any such
case, become immediately exercisable at any time and from time to time upon such
termination or upon Cordiant and Sub being informed of such breach,  as the case
may be, and until the date  which is 20 days after the date of such  termination
or the date on which  Cordiant and Sub are informed of such breach,  as the case
may be,  provided,  that if at the  expiration  of such 20-day  period the Stock
Options cannot be exercised by reason of any preliminary or final  injunction or
other order issued by any court or  governmental,  administrative  or regulatory
agency or authority  prohibiting  the exercise of the Stock Options  pursuant to
this  Agreement,  or because all  waiting  periods  under the  Hart-Scott-Rodino
Antitrust Improvements Act of 1976, as amended (the "HSR ACT"), required for the
purchase of the Shares upon such exercise shall not have expired or been waived,
the Stock Options shall be exercisable until 10 business days after the later of
the date on which such  impediment to exercise  shall have been removed or shall
have become final and not subject to appeal.  In all other instances,  the Stock
Options shall  terminate upon the  termination of the Merger  Agreement.  In the
event that Cordiant wishes to exercise the Stock Options,  Cordiant shall send a
written notice (the "Notice") to the  Stockholder  identifying  the place (which
shall be in New York City for each  Stockholder  who is a resident of the United
States  and in London  for each  Stockholder  who is a  resident  of the  United
Kingdom) and date (not less than two business days nor greater than ten business
days from the date of the  Notice)  for the  closing of such  purchase.  At such
closing,  Cordiant shall receive  certificates for the Shares, duly endorsed for
transfer,  and shall make  payment  therefor  by wire  transfer  of  immediately
available funds.

         4.  Disposition of Parent Shares.

                  (a)  Restrictions  on  Disposition.   The  Stockholder  hereby
agrees,  except as permitted in this Section 4(a) and Section 4(b) below, not to
directly or indirectly, offer to sell, contract to sell, transfer, assign, cause
to be  redeemed  or  otherwise  sell  or  dispose  of any of the  Parent  Shares
(collectively  a  "Disposition")  received by the stockholder in connection with
the Merger without the prior written consent of Cordiant. The parties agree that
any  Parent  Shares  received  by the  Stockholder  with  respect  to any shares
received after the date hereof under the earn-out  payments payable under of the
Agreement  and Plan of Merger (the  "Agreement")  dated as of August 1, 1999, by
and between the Company,  HC-Falk Acquisition Corp., Falk  Communications  Inc.,
the Stockholder and the  Stockholder,  as trustee under the Spencer Falk Grantor
Retained Annuity Trust u/t/a/d March 5, 1999 (the "Subsequent Shares") shall not
be subject to this Section 4 (other than the last sentence of Section 4(b) which
shall  apply to the  Subsequent  shares  for a  period  of 180  days  after  the
Effective  Time).  Notwithstanding  anything  to the  contrary  provided in this
Agreement, the Stockholder shall have the right to transfer Parent Shares (i) to
any Family Member, (ii) to the trustee or trustees of a trust solely (except for
remote  contingent  interests) for the benefit of the Stockholder  and/or one or
more Family Members and/or a charitable  organization (a "Family Member Trust"),
(iii) to a foundation  created or established by the  Stockholder,  or any other
charitable  organization,  (iv) to a corporation of which the Stockholder and/or
any Family  Member  and/or any Family  Member Trust owns all of the  outstanding
capital  stock,  (v) to a limited  liability  company  of which the  Stockholder
and/or  any  Family  Member  and/or  any  Family  Member  Trust  owns all of the
outstanding membership interests, (vi) to a partnership of which the Stockholder
and/or  any  Family  Member  and/or  any  Family  Member  Trust  owns all of the
partnership  interests,  (vii)  to  the  executor,   administrator  or  personal
representative  of the estate of the Stockholder or any other Family Member,  or
(viii) to any guardian,  trustee or  conservator  appointed  with respect to the
assets of the Stockholder,  provided, that in the case of any such transfer, the
transferee shall execute an agreement to be bound by the terms of this Agreement
(each such transfer,  a "Permitted Transfer" and,  collectively,  the "Permitted
Transfers").  For purposes of this Agreement, "Family Member" shall mean (a) the
Stockholder's  spouse,  if  living  with  the  Stockholder,  (b)  any one of the
following:  the Stockholder's father,  mother, issue, brother or sister, and the
issue of a brother or sister,  and (c) the spouse of any Family Member described
in (b)  above,  if the  spouse  shall be living  with that  Family  Member.  The
Stockholder   hereby   agrees  and  consents  to  the  entry  of  stop  transfer
instructions with Cordiant's  transfer agent against the transfer of such Parent
Shares except in compliance with this Agreement.  Notwithstanding the foregoing,
the Stockholder may pledge,  hypothecate or otherwise grant a security  interest
in all or a portion of the Parent  Shares  beneficially  owned by him during the
term of this Agreement; provided, however, that any Person receiving such Parent
Shares shall be subject to all of the restrictions on Disposition of such Parent
Shares imposed by this Agreement to the same extent as the Stockholder.

                  (b) Permitted Dispositions. The Stockholder may not effect any
Disposition of Parent Shares  received by the Stockholder in connection with the
Merger  except as  follows:  (i)  during  the  twelve-month  period  immediately
following the Effective Time the  Stockholder  may effect the Disposition of not
more than 10% of the Parent Shares  Beneficially  Owned by the  Stockholder  and
(ii) during the  twenty-four-month  period  immediately  following the Effective
Time (the "Period"), the Stockholder may effect the Disposition of not more than
50% of the  Parent  Shares  Beneficially  Owned  by the  Stockholder.  Upon  the
expiration of the Period,  the Stockholder may effect the Dispositions of all or
any  portion  of the  Parent  Shares  Beneficially  Owned by him  subject to any
applicable  restrictions  under the Federal  Securities Law and  restrictions of
general  application  under  English law, the Listing  Rules of the London Stock
Exchange,  if applicable,  and  Cordiant's  policies made pursuant to such rules
regarding  dealings in Parent  Shares by  directors  and  relevant  employees of
Cordiant and its subsidiaries,  if applicable.  Notwithstanding  anything to the
contrary contained in this Section 4, the Stockholder hereby agrees that for the
period commencing at the Effective Time and ending on the date which is 180 days
after the  expiration  of the  Period,  the  Stockholder  shall give  Cordiant 1
business day prior written  notice of any intended  Disposition of Parent Shares
to be made by the  Stockholder  and at the request of Cordiant  agrees to effect
such Disposition through brokers or other financial intermediaries designated by
Cordiant to maintain an orderly  trading market for the Parent Shares,  provided
that  such  financial   intermediary  agrees  to  effect  and  does  effect  the
Disposition in a reasonable period following such notice.

          5. Representations and Warranties of the Stockholder.  The Stockholder
hereby represents and warrants to each of Cordiant and Sub as follows:

                  (a) Ownership of Shares.  The Stockholder is the record holder
of or Beneficially  Owns the Shares.  On the date hereof,  the Shares constitute
all of the shares of Common Stock owned of record or  Beneficially  Owned by the
Stockholder  (excluding  any Stock Options (as defined in the Merger  Agreement)
held by the  Stockholder).  The Stockholder has sole voting power and sole power
to issue instructions with respect to the matters set forth in Section 2 hereof,
sole power of  disposition,  sole power of  conversion,  sole power to  exercise
dissenters'  rights and sole power to agree to all of the  matters  set forth in
this  agreement,  in  each  case  with  respect  to all of the  Shares,  with no
limitations,   qualifications  or  restrictions  on  such  rights,   subject  to
applicable securities laws and the terms of this Agreement.

                  (b) Power;  Binding  Agreement.  The Stockholder has the legal
capacity,  power and authority to enter into and perform all of his  obligations
under this Agreement. The execution,  delivery and performance of this Agreement
by the Stockholder will not violate any other Agreement to which the Stockholder
is a party including,  without  limitation,  any voting agreement,  shareholders
agreement or voting trust. This Agreement has been duly and validly executed and
delivered by the Stockholder  and  constitutes a valid and binding  agreement of
the  Stockholder,  enforceable  against the  Stockholder in accordance  with its
terms  except  that  such  enforceability  (i)  may be  limited  by  bankruptcy,
insolvency,  moratorium  or other similar laws  relating to the  enforcement  of
creditors' rights generally and (ii) is subject to general  principles of equity
and  discretion  of the court before which any  proceedings  seeking  injunctive
relief or specific  performance may be sought. There is no beneficiary or holder
of a voting  trust  certificate  or other  interest  of any  trust of which  the
Stockholder  is trustee whose consent is required for the execution and delivery
of this agreement or the  consummation  by the  Stockholder of the  transactions
contemplated  hereby. If the Stockholder is married and the Stockholder's Shares
constitute community property, this agreement has been duly authorized, executed
and  delivered  by,  and  constitutes  a valid and  binding  agreement  of,  the
Stockholder's  spouse,  enforceable  against such Person in accordance  with its
terms  except  that  such  enforceability  (i)  may be  limited  by  bankruptcy,
insolvency,  moratorium  or other similar laws  relating to the  enforcement  of
creditors' rights generally and (ii) is subject to general  principles of equity
and  discretion  of the court before which any  proceedings  seeking  injunctive
relief or specific performance may be sought.

                  (c) No Conflicts. Except for filings, permits, authorizations,
consents and  approvals  under the HSR Act and the  Securities  Act of 1933,  if
applicable,  (A) no  filing  with,  and no  permit,  authorization,  consent  or
approval of, any state or federal  public body or authority is necessary for the
execution  of this  Agreement by the  Stockholder  and the  consummation  by the
Stockholder  of  the  transactions  contemplated  hereby  and  (B)  none  of the
execution and delivery of this Agreement by the Stockholder, the consummation by
the  Stockholder of the  transactions  contemplated  hereby or compliance by the
Stockholder with any of the provisions  hereof shall, in a manner which would be
material  and  adverse  to the  ability of the  Stockholder  to  consummate  the
transactions contemplated hereby or to comply with the terms hereof, result in a
violation or breach of, or constitute  (with or without  notice or lapse of time
or both) a  default  (or give  rise to any  third  party  right of  termination,
cancellation,  material  modification or  acceleration)  under any of the terms,
conditions  or  provisions  of any note,  bond,  mortgage,  indenture,  license,
contract, commitment, arrangement,  understanding, agreement or other instrument
or  obligation of any kind to which the  Stockholder  is a party or by which the
Stockholder or any of the  Stockholder's  properties or assets may be bound,  or
(3) violate any order, writ, injunction,  decree, judgment, order, statute, rule
or  regulation  applicable  to the  Stockholder  or  any  of  the  Stockholder's
properties or assets.

                  (d) No  Encumbrances.  Except as applicable in connection with
the  transactions  contemplated  hereby or as set forth on  Schedule  B attached
hereto, the Shares and the certificates  representing the Shares are now, and at
all times  during the term  hereof  will be,  held by the  Stockholder,  or by a
nominee or custodian for the benefit of the  Stockholder,  free and clear of all
liens,  claims,  security  interests,  proxies,  voting  trusts  or  agreements,
understandings or arrangements or any other encumbrances whatsoever,  except for
any such encumbrances or proxies arising hereunder in favor of Cordiant.

                  (e) No Finder's Fees. No broker,  investment banker, financial
adviser  or other  person  is  entitled  to any  broker's,  finder's,  financial
adviser's or other similar fee or commission in connection with the transactions
contemplated  hereby  based  upon  arrangements  made  by or on  behalf  of  the
Stockholder  other than Bear Stearns & Co. Inc.,  the fees and expenses of which
shall be paid by the Company.

                  (f) Reliance by Cordiant and Sub. The Stockholder  understands
and acknowledges that Cordiant and Sub are entering into the Merger Agreement in
reliance upon the Stockholder's execution and delivery of this Agreement.

         6.   Additional  Covenants of the Stockholder.  The Stockholder  hereby
covenants to each of Cordiant and Sub as follows:

                  (a) No  Solicitation.  Subject to the provisions  contained in
Section 10 of this  Agreement,  the  Stockholder  shall not, in his  capacity as
such,   directly  or  indirectly,   solicit  (including  by  way  of  furnishing
information)  or respond to any  inquiries  or the making of any proposal by any
Person or entity (other than Cordiant or any affiliate of Cordiant) with respect
to the Company that constitutes a Takeover Proposal. If the Stockholder receives
any such  inquiry  or  proposal,  then the  Stockholder  shall  promptly  inform
Cordiant of the existence  thereof.  The Stockholder will immediately  cease and
cause to be terminated any existing activities, discussions or negotiations with
any parties conducted heretofore with respect to any of the foregoing.

                  (b)   Restriction   on   Transfer   of  Shares,   Proxies  and
Non-Interference.  Beginning on the date hereof and ending on the later to occur
of (A) last date the Stock Options are exercisable  pursuant to Section 3 hereof
and (B) the date that all of the Stockholder's  obligations under Section 2 have
terminated, except as contemplated by this Agreement or the Merger Agreement, no
Stockholder shall,  directly or indirectly,  (i) offer for sale, sell, transfer,
tender,  pledge,  encumber,  assign or  otherwise  dispose of, or enter into any
contract,  option or other  arrangement  or  understanding  with  respect  to or
consent to the offer for sale,  sale,  transfer,  tender,  pledge,  encumbrance,
assignment  or other  disposition  of, any or all of the Shares or any  interest
therein;  (ii) except as contemplated  by this  Agreement,  grant any proxies or
powers of attorney,  deposit any of the Shares into a voting trust or enter into
a voting  agreement with respect to any of the Shares;  or (iii) take any action
that would make any  representation  or  warranty of the  Stockholder  contained
herein  untrue or incorrect or have the effect of  preventing  or disabling  the
Stockholder from performing the Stockholder's  obligations under this Agreement.
Notwithstanding   anything  to  the  contrary  provided  in  this  Agreement,  a
Stockholder  shall have the right to make  Permitted  Transfers  of Shares.  The
Stockholder agrees with, and covenants to, Sub that beginning on the date hereof
and  ending on the last date the  Stock  Options  are  exercisable  pursuant  to
Section 3 hereof,  the Stockholder  shall not request that the Company  register
the transfer  (book-entry  or otherwise) of any  certificate  or  uncertificated
interest  representing  any of the  Shares,  unless  such  transfer  is  made in
compliance with this Agreement (including the provisions of Section 2 hereof).

                  (c) Additional  Shares.  The  Stockholder  agrees,  while this
Agreement is in effect (i) to notify  Cordiant and Sub promptly of the number of
any shares of Common  Stock  acquired by the  Stockholder  after the date hereof
(the "Additional  Shares") and (ii) to vote such Additional Shares in accordance
with Section 2 hereof. Such Additional Shares shall also be subject to the Stock
Option granted to Sub pursuant to Section 3 hereof and the restriction contained
in Section 6(b)(i) and (ii) above.

         7.   Representations  and Warranties of Cordiant and Sub.  Cordiant and
Sub hereby  covenant,  represent  and  warrant to the  Stockholder  that each of
Cordiant and Sub has the legal  capacity,  power and authority to enter into and
perform all of such party's  obligations  under this  Agreement;  the execution,
delivery and  performance of this Agreement by Cordiant and Sub will not violate
or result in a breach of any other  material  agreement to which Cordiant or Sub
is a party; the execution and delivery of this Agreement and the consummation of
the transactions  contemplated hereby (i) have been duly authorized by the board
of  directors  of  Cordiant  and Sub,  and (ii) do not and will not  violate any
provision of the certificate of incorporation or by-laws of Cordiant or Sub; and
this  Agreement  has been duly and validly  executed  and  delivered  by each of
Cordiant and Sub and  constitutes  a valid and binding  agreement of such party,
enforceable against such party in accordance with its terms.

         8.  Further Assurances. From time to time, at the other party's request
and without further  consideration,  each party hereto shall execute and deliver
such additional reasonable documents and take all such further reasonable lawful
action as may be necessary or desirable to consummate and make effective, in the
most  expeditious  manner  practicable,  the  transactions  contemplated by this
Agreement.

         9.   Termination;  Expenses and Fee. (a) The covenants  and  agreements
contained herein with respect to the Shares shall terminate (i) in the event the
Merger  Agreement  is  terminated  in  accordance  with  its  terms,  upon  such
termination,  except that the  provisions of Sections 2, 3 and 6(b) hereof shall
survive any such  termination  solely in accordance with their terms and (ii) in
the event the Merger is  consummated,  at the  Effective  Time,  except that the
provisions of Section 4 hereof shall survive any such termination,  provided, in
each case, that the provisions of Section 12 and Section 13 hereof shall survive
any termination of this Agreement, and provided, further, that no termination of
this Agreement shall relieve any party of liability for a breach hereof.

         (b) Each party shall bear  its own expenses  in  connection  with  this
Agreement and the transactions contemplated hereby.

         10.  Stockholder  Capacity.  The  Stockholder  is  not  executing  this
Agreement and does not make any agreement or understanding  herein in his or her
capacity as a director or officer of the  Company and nothing  contained  herein
shall limit or affect any actions taken by the  Stockholder in his capacity as a
director or officer of the Company to the extent such action is permitted by, or
not  prohibited  by,  the  Merger  Agreement,  and none of such  actions in such
capacities  shall be  deemed  to  constitute  a breach  of this  Agreement.  The
Stockholder  signs solely in his capacity as the record and beneficial owner of,
or the trustee of a trust whose  beneficiaries are the beneficial owners of, the
Shares.

         11. Sophistication. The Stockholder acknowledges that he is an informed
and sophisticated  investor and, together with his advisors, has undertaken such
investigation as they have deemed necessary,  including the review of the Merger
Agreement and this Agreement,  to enable the Stockholder to make an informed and
intelligent decision with respect to the Merger Agreement and this Agreement and
the transactions contemplated thereby and hereby.

         12.  Confidentiality.  Each  of  the  parties  hereto  recognizes  that
successful  consummation of the transactions  contemplated by this Agreement may
be  dependent  upon  confidentiality  with  respect to the  matters  referred to
herein. In this connection, pending public disclosure thereof, each party hereby
agrees not to disclose or discuss  such  matters with anyone not a party to this
Agreement or the Merger Agreement (other than such party's counsel and advisors,
if any) without the prior written consent of the other party, except for filings
required  pursuant to the Exchange Act and the rules and regulations  thereunder
or disclosures  such party's  counsel  advises are necessary in order to fulfill
such  party's  obligations  imposed by law, in which event such party shall give
notice of such disclosure to the other party as promptly as practicable so as to
enable the other  party to seek a  protective  order  from a court of  competent
jurisdiction with respect thereto.

         13.   Miscellaneous.

                  (a) Entire Agreement.  This Agreement and the Merger Agreement
constitute the entire agreement  between the parties with respect to the subject
matter hereof and supersede all other prior agreements and understandings,  both
written and oral, between the parties with respect to the subject matter hereof.

                  (b) Certain Events. The Stockholder agrees that this Agreement
and the obligations hereunder shall attach to the Stockholder's Shares and shall
be binding upon any person or entity to which legal or  beneficial  ownership of
such Shares shall pass,  whether by operation  of law or  otherwise,  including,
without  limitation,  the  Stockholder's  heirs,  guardians,  administrators  or
successors,  provided,  that following the Effective  Time, this Agreement shall
not be binding on any  purchaser of Shares in a  transaction  made in compliance
with Section 4(b), other than Permitted Transfers.  Notwithstanding any transfer
of  Shares,  the  transferor  shall  remain  liable for the  performance  of all
obligations under this Agreement of the transferor.

                  (c) Change in Control.  In the event that after the  Effective
Time (i) any Person or group of Persons  acting in  concert  (as  defined in the
City Code on Take-overs and Mergers in the United Kingdom)  acquires an interest
in the equity share capital of Cordiant (an "Acquiring Person") and, immediately
following such  acquisition,  such person,  or group,  holds shares  entitled to
exercise  more than 50% of the votes  which may be cast at a general  meeting of
Cordiant or (ii) a majority of the board of  directors  of Cordiant  immediately
prior  to  such  Person  becoming  an  Acquiring  Person,  cease  to  thereafter
constitute a majority of the board of directors of Cordiant  (other than through
elections of directors  whose  nomination  for election by the  shareholders  of
Cordiant  were  approved by the vote of a majority of  directors of Cordiant who
were either  directors prior to a Person  becoming an Acquiring  Person or whose
election or  nomination  for  election  was so  previously  approved),  then the
restrictions on Dispositions contained in Section 4, shall terminate without any
action on the part of any party hereto.

                  (d)  Assignment.  This  Agreement  shall  not be  assigned  by
operation of law or  otherwise  without the prior  written  consent of the other
party,  provided,  that Cordiant or Sub may assign, in its sole discretion,  its
rights  and  obligations  hereunder  to any  direct  or  indirect  wholly  owned
subsidiary of Cordiant,  but no such assignment shall relieve Cordiant or Sub of
its  obligations  hereunder  if such  assignee  does not or cannot  perform such
obligations.

                  (e)  Amendments,  Waivers,  Etc.  This  Agreement  may  not be
amended,  changed,  supplemented,  waived or otherwise  modified or  terminated,
except upon the  execution and delivery of a written  agreement  executed by the
party to be charged  thereby  or,  with  respect to  termination,  as  otherwise
provided herein.

                  (f) Notices. All notices,  requests, claims, demands and other
communications  hereunder  shall be in writing  and shall be given (and shall be
deemed to have been duly received if so given) by hand delivery, telegram, telex
or telecopy,  or by mail (registered or certified mail, postage prepaid,  return
receipt requested) or by any courier service, such as Federal Express, providing
proof of  delivery.  All  communications  hereunder  shall be  delivered  to the
respective parties at the following addresses:

         If to the Stockholder:     Spencer Falk
                                    c/o Healthworld Corporation
                                    100 Avenue of the Americas
                                    New York, New York 10010
                                    Facsimile: (212) 966-2743

         and

         If to Cordiant or
         Sub to:                    Cordiant Communications Group plc
                                    121-141 Westbourne Terrace
                                    London W2 6JR
                                    Attention: Deputy Finance Director
                                    Facsimile: +44-171-262-4300

         copy to:                   White & Case LLP
                                    1155 Avenue of the Americas
                                    New York, New York  10036-2787
                                    Attention:  Timothy B. Goodell, Esq.
                                    Facsimile:  (212) 354-8113

or to such  other  address  as the  person  to whom  notice  is  given  may have
previously furnished to the others in writing in the manner set forth above.

                  (g) Severability. Whenever possible, each provision or portion
of any provision of this  Agreement  will be interpreted in such manner as to be
effective and valid under  applicable law but if any provision or portion of any
provision of this Agreement is held to be invalid,  illegal or  unenforceable in
any  respect  under  any  applicable  law  or  rule  in any  jurisdiction,  such
invalidity,  illegality or unenforceability  will not affect any other provision
or portion of any provision in such  jurisdiction,  and this  Agreement  will be
reformed,  construed  and  enforced  in such  jurisdiction  as if such  invalid,
illegal or  unenforceable  provision or portion of any  provision had never been
contained herein.

                  (h)  Specific   Performance.   Each  of  the  parties   hereto
recognizes and  acknowledges  that a breach by it of any covenants or agreements
contained in this  Agreement will cause the aggrieved  party to sustain  damages
for which it would not have an  adequate  remedy at law for money  damages,  and
therefore each of the parties hereto agrees that in the event of any such breach
the aggrieved  party shall be entitled to the remedy of specific  performance of
such  covenants and agreements  and  injunctive  and other  equitable  relief in
addition to any other remedy to which it may be entitled, at law or in equity.

                  (i)  Remedies  Cumulative.  All  rights,  powers and  remedies
provided under this Agreement or otherwise available in respect hereof at law or
in equity  shall be  cumulative  and not  alternative,  and the  exercise of any
thereof by any party shall not preclude the  simultaneous  or later  exercise of
any other such right, power or remedy by such party.

                  (j) No Waiver. The failure of any party hereto to exercise any
right,  power or remedy provided under this Agreement or otherwise  available in
respect  hereof at law or in equity,  or to insist upon  compliance by any other
party hereto with its obligations  hereunder,  and any custom or practice of the
parties at variance with the terms hereof, shall not constitute a waiver by such
party of its right to exercise  any such or other  right,  power or remedy or to
demand such compliance.

                  (k)  No  Third  Party  Beneficiaries.  This  Agreement  is not
intended to be for the benefit of, and shall not be  enforceable  by, any person
or entity who or which is not a party hereto.

                  (l)  Governing  Law.  This  Agreement  shall be  governed  and
construed in accordance  with the laws of the State of New York,  without giving
effect to the principles of conflicts of law thereof.

                  (m) Jurisdiction. Each party hereby irrevocably submits to the
exclusive  jurisdiction of the Court of Chancery in the State of Delaware or the
United States District Court for the Southern  District of New York or any court
of the State of New York located in the City of New York in any action,  suit or
proceeding  arising in connection with this Agreement,  and agrees that any such
action,  suit or proceeding  shall be brought only in such court (and waives any
objection  based  on  forum  non  conveniens  or any  other  objection  to venue
therein); provided, however, that such consent to jurisdiction is solely for the
purpose  referred  to in this  paragraph  (1) and  shall  not be  deemed to be a
general  submission  to the  jurisdiction  of said  Courts  or in the  States of
Delaware  or New York other than for such  purposes.  Each party  hereto  hereby
waives any right to a trial by jury in connection with any such action,  suit or
proceeding.

                  (n) Descriptive Headings. The descriptive headings used herein
are inserted for  convenience  of reference only and are not intended to be part
of or to affect the meaning or interpretation of this Agreement.

                  (o)   Counterparts.   This   Agreement   may  be  executed  in
counterparts, each of which shall be deemed to be an original, but all of which,
taken together, shall constitute one and the same Agreement.


                         [SIGNATURES BEGIN ON NEXT PAGE]




<PAGE>


         IN WITNESS WHEREOF,  Cordiant, Sub and the Stockholder have caused this
Agreement to be duly executed as of the day and year first above written.


                                      CORDIANT COMMUNICATIONS GROUP PLC


                                      By: /s/ Arthur D'Angelo
                                          --------------------------------
                                          Name:  Arthur D'Angelo
                                          Title: Finance Director



                                      HEALTHWORLD ACQUISITION CORP.


                                      By: /s/ Arthur D'Angelo
                                          --------------------------------
                                          Name:  Arthur D'Angelo
                                          Title: President



                                      /s/ Spencer Falk
                                      ------------------------------------
                                      Spencer Falk


<PAGE>




               Schedule B to Stockholder Agreement of Spencer Falk



No exceptions.






                                                                       EXHIBIT 5


                              STOCKHOLDER AGREEMENT


         AGREEMENT dated November 9, 1999, among Cordiant  Communications  Group
plc,  a company  organized  under the laws of  England  and Wales  ("Cordiant"),
Healthworld Acquisition Corporation,  a Delaware corporation and a direct wholly
owned subsidiary of Cordiant ("Sub"), and Michael Garnham (the "Stockholder").

                              W I T N E S S E T H:

         WHEREAS,   concurrently  herewith,   Cordiant,   Sub,  and  Healthworld
Corporation,  a Delaware  corporation  (the  "Company"),  are  entering  into an
Agreement  and Plan of Merger (as such  agreement  may hereafter be amended from
time to time, the "Merger Agreement"), pursuant to which Sub will be merged with
and into the Company and the Company shall continue as the surviving corporation
(the "Merger");

         Whereas,  the  Stockholder  Beneficially  Owns,  as of the date hereof,
242,231 shares (the "Shares") of common stock,  $.01 par value per share, of the
Company (the "Common Stock"); and

         WHEREAS,  as an inducement  and a condition to entering into the Merger
Agreement,  Cordiant and Sub have required that the Stockholder  agree,  and the
Stockholder has agreed, to enter into this Agreement;

         NOW,  THEREFORE,  in  consideration  of the  foregoing  and the  mutual
premises,  representations,   warranties,  covenants  and  agreements  contained
herein,  the parties  hereto,  intending  to be legally  bound,  hereby agree as
follows:

         1. Definitions. Unless other defined herein, all capitalized terms used
herein shall have the meanings given to such terms in the Merger Agreement.  For
purposes of this Agreement:

                  (a) "Beneficially Own" or "Beneficial  Ownership" with respect
to any securities  shall mean having  "beneficial  ownership" of such securities
(as determined pursuant to Rule 13d-3 under the Securities Exchange Act of 1934,
as  amended  (the  "Exchange  Act")),   including  pursuant  to  any  agreement,
arrangement or understanding, whether or not in writing.

         Without duplicative counting of the same securities by the same holder,
securities  Beneficially Owned by a Person shall include securities Beneficially
Owned by all other  Persons with whom such Person would  constitute a "group" as
within the meanings of Section 13(d)(3) of the Exchange Act.

                  (b) "Exchange Rate" means the average  currency  exchange rate
of pounds  sterling to US dollars based upon the noon buying rate in the City of
New York for cable  transfers in foreign  currencies as announced by the Federal
Reserve Bank of New York for customs  purposes over the 10  consecutive  Trading
Days  ending on the day on which the Stock  Options  are  exercised  pursuant to
Section 3.

                  (c)  "Parent  Share  Value"  shall mean the product of (x) the
average of the closing  middle market  quotation of a Parent Share on the LSE as
reported in the Daily Official List of the London Stock Exchange for each of the
ten  consecutive  Trading Days ending on the day on which the Stock  Options are
exercised pursuant to Section 3 multiplied by (y) Exchange Rate.

                  (d) "Parent  Shares"  shall mean the ordinary  shares,  with a
nominal  value  of U.K.  fifty  pence  each  ("Ordinary  Shares"),  of  Cordiant
(including  any  options or other  rights to receive  Ordinary  Shares)  and the
American Depositary Shares, each representing the right to receive five Ordinary
Shares ("ADSs").

                  (e)   "Person"   shall   mean  an   individual,   corporation,
partnership,  limited  liability  company,  joint venture,  association,  trust,
unincorporated organization or other entity.

                  (f) "Share Value" shall be determined as follows:

                  (i) if the  Parent  Share  Value is equal to or  greater  than
         $2.5054  and equal to or less than  $3.4838,  the Share  Value shall be
         $20.00;

                  (ii) if the Parent Share Value  is  greater  than $3.4838, the
         Share Value  shall be  $23.00; and

                  (iii) if  the  Parent  Share  Value is  less than $2.5054, the
         Share Value shall be $17.00.

                  (g) "Trading Day" shall mean any day on which  securities  are
traded,  with  respect to ADSs,  on the New York Stock  Exchange,  Inc. and with
respect to Ordinary Shares, on the London Stock Exchange Limited.

         2.   Provisions  Concerning  Common Stock.  (a) The Stockholder  hereby
agrees that during the period  described in clause (b) below,  at any meeting of
the holders of Common Stock of the Company,  however  called,  or in  connection
with any written  consent of the  holders of Common  Stock of the  Company,  the
Stockholder  shall vote (or cause to be voted) the Shares of Common Stock of the
Company,  (i) in favor of the Merger,  the execution and delivery by the Company
of the Merger  Agreement  and the approval of the terms  thereof and each of the
other actions  contemplated  by the Merger  Agreement and this Agreement and any
actions required in furtherance  thereof and hereof;  (ii) against any action or
agreement that would result in a breach in any material respect of any covenant,
representation  or warranty or any other  obligation or agreement of the Company
under the Merger  Agreement  or this  Agreement;  and (iii)  except as otherwise
agreed to in writing  in advance by  Cordiant,  against  the  following  actions
(other  than  the  Merger  and  the  transactions  contemplated  by  the  Merger
Agreement):  (A) any  extraordinary  corporate  transaction,  such as a  merger,
consolidation  or  other  business  combination  involving  the  Company  or its
Subsidiaries;  (B) a sale,  lease or transfer of a material  amount of assets of
the  Company  or  its  Subsidiaries,  or  a  reorganization,   recapitalization,
dissolution or liquidation of the Company or its Subsidiaries; (C) any change in
a majority of the persons who  constitute the board of directors of the Company;
(D) any change in the present  capitalization of the Company or any amendment of
the Company's  Certificate of  Incorporation  or Bylaws;  (E) any other material
change in the Company's corporate structure or business; or (F) any other action
involving the Company or its Subsidiaries which is intended, or could reasonably
be  expected,  to  materially  impede,   interfere  with,  delay,  postpone,  or
materially adversely affect the Merger and the transactions contemplated by this
Agreement and the Merger  Agreement.  The  Stockholder  shall not enter into any
agreement  or  understanding  with any  Person  the  effect  of  which  would be
inconsistent  with or violative of the provisions  and  agreements  contained in
this Section 2.

         (b) The  obligations  of the  Stockholders  under clauses (i), (ii) and
(iii)(C),  (D), (E) and (F) of this Section 2 shall  terminate on the earlier to
occur of the  Effective  Time and the  termination  of the Merger  Agreement  in
accordance  with its terms.  The  obligations  of the  Stockholder  under clause
(iii)(A)  and (B) of this  Section 2 shall  terminate on the earlier to occur of
the Effective Time and 120 days after the termination of the Merger Agreement in
accordance  with its terms (unless the Merger  Agreement is terminated by reason
of the  failure  to  obtain  Parent  Shareholders'  Approval  in which  case the
Stockholder's  obligations  under this Section 2 shall terminate  simultaneously
with the termination of the Merger Agreement).

         3.   Option to Purchase.  In order to induce  Cordiant and Sub to enter
into the Merger Agreement,  the Stockholder  hereby grants to Sub an irrevocable
option (the "Stock  Options")  to  purchase,  all, and not less than all, of the
Shares at a purchase  price per share equal to the Share Value,  payable in cash
(the  "Purchase  Price"),  solely upon, and subject to, the terms and conditions
set forth below.  The Stock Options may only be exercised if Sub  simultaneously
exercises  all other  options held by it to purchase all, and not less than all,
of the shares of Common Stock covered by such  options.  The Stock Options shall
become  exercisable  solely in the event that the Merger Agreement is terminated
pursuant  to (i)  Section  9.1(b)(ii)  thereof,  but only if the  basis for such
termination  is the failure to obtain the Company  Stockholder  Approval or (ii)
Section  9.1(b)(iii)  thereof,  but only if the basis for such  termination is a
breach by the Company,  or the  Stockholder  materially  breaches any  agreement
contained in this Agreement, in which event the Stock Options shall, in any such
case, become immediately exercisable at any time and from time to time upon such
termination or upon Cordiant and Sub being informed of such breach,  as the case
may be, and until the date  which is 20 days after the date of such  termination
or the date on which  Cordiant and Sub are informed of such breach,  as the case
may be,  provided,  that if at the  expiration  of such 20-day  period the Stock
Options cannot be exercised by reason of any preliminary or final  injunction or
other order issued by any court or  governmental,  administrative  or regulatory
agency or authority  prohibiting  the exercise of the Stock Options  pursuant to
this  Agreement,  or because all  waiting  periods  under the  Hart-Scott-Rodino
Antitrust Improvements Act of 1976, as amended (the "HSR ACT"), required for the
purchase of the Shares upon such exercise shall not have expired or been waived,
the Stock Options shall be exercisable until 10 business days after the later of
the date on which such  impediment to exercise  shall have been removed or shall
have become final and not subject to appeal.  In all other instances,  the Stock
Options shall  terminate upon the  termination of the Merger  Agreement.  In the
event that Cordiant wishes to exercise the Stock Options,  Cordiant shall send a
written notice (the "Notice") to the  Stockholder  identifying  the place (which
shall be in New York City for each  Stockholder  who is a resident of the United
States  and in London  for each  Stockholder  who is a  resident  of the  United
Kingdom) and date (not less than two business days nor greater than ten business
days from the date of the  Notice)  for the  closing of such  purchase.  At such
closing,  Cordiant shall receive  certificates for the Shares, duly endorsed for
transfer,  and shall make  payment  therefor  by wire  transfer  of  immediately
available funds.

         4.   Disposition of Parent Shares.

                  (a)  Restrictions  on  Disposition.   The  Stockholder  hereby
agrees,  except as permitted in this Section 4(a) and Section 4(b) below, not to
directly or indirectly, offer to sell, contract to sell, transfer, assign, cause
to be  redeemed  or  otherwise  sell  or  dispose  of any of the  Parent  Shares
(collectively  a  "Disposition")  received by the stockholder in connection with
the  Merger  without  the prior  written  consent of  Cordiant.  Notwithstanding
anything to the contrary provided in this Agreement,  the Stockholder shall have
the right to  transfer  Parent  Shares  (i) to any  Family  Member,  (ii) to the
trustee or trustees of a trust solely (except for remote  contingent  interests)
for the benefit of the  Stockholder  and/or one or more Family  Members and/or a
charitable organization (a "Family Member Trust"), (iii) to a foundation created
or established by the Stockholder, or any other charitable organization, (iv) to
a  corporation  of which the  Stockholder  and/or any Family  Member  and/or any
Family Member Trust owns all of the outstanding  capital stock, (v) to a limited
liability  company of which the Stockholder  and/or any Family Member and/or any
Family Member Trust owns all of the outstanding membership interests,  (vi) to a
partnership of which the Stockholder  and/or any Family Member and/or any Family
Member  Trust  owns all of the  partnership  interests,  (vii) to the  executor,
administrator or personal representative of the estate of the Stockholder or any
other Family Member, or (viii) to any guardian, trustee or conservator appointed
with respect to the assets of the Stockholder, provided, that in the case of any
such  transfer,  the  transferee  shall  execute an agreement to be bound by the
terms of this  Agreement  (each  such  transfer,  a  "Permitted  Transfer"  and,
collectively,  the  "Permitted  Transfers").  For  purposes  of this  Agreement,
"Family  Member"  shall mean (a) the  Stockholder's  spouse,  if living with the
Stockholder,  (b) any one of the following:  the Stockholder's  father,  mother,
issue,  brother  or sister,  and the issue of a brother  or sister,  and (c) the
spouse of any  Family  Member  described  in (b) above,  if the spouse  shall be
living with that Family Member.  The  Stockholder  hereby agrees and consents to
the entry of stop transfer  instructions with Cordiant's  transfer agent against
the transfer of such Parent  Shares except in  compliance  with this  Agreement.
Notwithstanding  the  foregoing,  the  Stockholder  may pledge,  hypothecate  or
otherwise  grant a security  interest  in all or a portion of the Parent  Shares
beneficially owned by him during the term of this Agreement;  provided, however,
that any Person  receiving  such  Parent  Shares  shall be subject to all of the
restrictions  on  Disposition of such Parent Shares imposed by this Agreement to
the same extent as the Stockholder.

                  (b) Permitted Dispositions. The Stockholder may not effect any
Disposition of Parent Shares  received by the Stockholder in connection with the
Merger  except as  follows:  (i)  during  the  twelve-month  period  immediately
following the Effective Time the  Stockholder  may effect the Disposition of not
more than 20% of the Parent Shares  Beneficially  Owned by the  Stockholder  and
(ii) during the  twenty-four-month  period  immediately  following the Effective
Time (the "Period"), the Stockholder may effect the Disposition of not more than
60% of the  Parent  Shares  Beneficially  Owned  by the  Stockholder.  Upon  the
expiration of the Period,  the Stockholder may effect the Dispositions of all or
any  portion  of the  Parent  Shares  Beneficially  Owned by him  subject to any
applicable  restrictions  under the Federal  Securities Law and  restrictions of
general  application  under  English law, the Listing  Rules of the London Stock
Exchange,  if applicable,  and  Cordiant's  policies made pursuant to such rules
regarding  dealings in Parent  Shares by  directors  and  relevant  employees of
Cordiant and its subsidiaries,  if applicable.  Notwithstanding  anything to the
contrary contained in this Section 4, the Stockholder hereby agrees that for the
period commencing at the Effective Time and ending on the date which is 180 days
after the  expiration  of the  Period,  the  Stockholder  shall give  Cordiant 1
business day prior written  notice of any intended  Disposition of Parent Shares
to be made by the  Stockholder  and at the request of Cordiant  agrees to effect
such Disposition through brokers or other financial intermediaries designated by
Cordiant to maintain an orderly  trading market for the Parent Shares,  provided
that  such  financial   intermediary  agrees  to  effect  and  does  effect  the
Disposition in a reasonable period following such notice.

         5.  Representations and Warranties of the Stockholder.  The Stockholder
hereby represents and warrants to each of Cordiant and Sub as follows:

                  (a) Ownership of Shares.  The Stockholder is the record holder
of or Beneficially  Owns the Shares.  On the date hereof,  the Shares constitute
all of the shares of Common Stock owned of record or  Beneficially  Owned by the
Stockholder  (excluding  any Stock Options (as defined in the Merger  Agreement)
held by the  Stockholder).  The Stockholder has sole voting power and sole power
to issue instructions with respect to the matters set forth in Section 2 hereof,
sole power of  disposition,  sole power of  conversion,  sole power to  exercise
dissenters'  rights and sole power to agree to all of the  matters  set forth in
this  agreement,  in  each  case  with  respect  to all of the  Shares,  with no
limitations,   qualifications  or  restrictions  on  such  rights,   subject  to
applicable securities laws and the terms of this Agreement.

                  (b) Power;  Binding  Agreement.  The Stockholder has the legal
capacity,  power and authority to enter into and perform all of his  obligations
under this Agreement. The execution,  delivery and performance of this Agreement
by the Stockholder will not violate any other Agreement to which the Stockholder
is a party including,  without  limitation,  any voting agreement,  shareholders
agreement or voting trust. This Agreement has been duly and validly executed and
delivered by the Stockholder  and  constitutes a valid and binding  agreement of
the  Stockholder,  enforceable  against the  Stockholder in accordance  with its
terms  except  that  such  enforceability  (i)  may be  limited  by  bankruptcy,
insolvency,  moratorium  or other similar laws  relating to the  enforcement  of
creditors' rights generally and (ii) is subject to general  principles of equity
and  discretion  of the court before which any  proceedings  seeking  injunctive
relief or specific  performance may be sought. There is no beneficiary or holder
of a voting  trust  certificate  or other  interest  of any  trust of which  the
Stockholder  is trustee whose consent is required for the execution and delivery
of this agreement or the  consummation  by the  Stockholder of the  transactions
contemplated  hereby. If the Stockholder is married and the Stockholder's Shares
constitute community property, this agreement has been duly authorized, executed
and  delivered  by,  and  constitutes  a valid and  binding  agreement  of,  the
Stockholder's  spouse,  enforceable  against such Person in accordance  with its
terms  except  that  such  enforceability  (i)  may be  limited  by  bankruptcy,
insolvency,  moratorium  or other similar laws  relating to the  enforcement  of
creditors' rights generally and (ii) is subject to general  principles of equity
and  discretion  of the court before which any  proceedings  seeking  injunctive
relief or specific performance may be sought.

                  (c) No Conflicts. Except for filings, permits, authorizations,
consents and  approvals  under the HSR Act and the  Securities  Act of 1933,  if
applicable,  (A) no  filing  with,  and no  permit,  authorization,  consent  or
approval of, any state or federal  public body or authority is necessary for the
execution  of this  Agreement by the  Stockholder  and the  consummation  by the
Stockholder  of  the  transactions  contemplated  hereby  and  (B)  none  of the
execution and delivery of this Agreement by the Stockholder, the consummation by
the  Stockholder of the  transactions  contemplated  hereby or compliance by the
Stockholder with any of the provisions  hereof shall, in a manner which would be
material  and  adverse  to the  ability of the  Stockholder  to  consummate  the
transactions contemplated hereby or to comply with the terms hereof, result in a
violation or breach of, or constitute  (with or without  notice or lapse of time
or both) a  default  (or give  rise to any  third  party  right of  termination,
cancellation,  material  modification or  acceleration)  under any of the terms,
conditions  or  provisions  of any note,  bond,  mortgage,  indenture,  license,
contract, commitment, arrangement,  understanding, agreement or other instrument
or  obligation of any kind to which the  Stockholder  is a party or by which the
Stockholder or any of the  Stockholder's  properties or assets may be bound,  or
(3) violate any order, writ, injunction,  decree, judgment, order, statute, rule
or  regulation  applicable  to the  Stockholder  or  any  of  the  Stockholder's
properties or assets.

                  (d) No  Encumbrances.  Except as applicable in connection with
the  transactions  contemplated  hereby or as set forth on  Schedule  B attached
hereto, the Shares and the certificates  representing the Shares are now, and at
all times  during the term  hereof  will be,  held by the  Stockholder,  or by a
nominee or custodian for the benefit of the  Stockholder,  free and clear of all
liens,  claims,  security  interests,  proxies,  voting  trusts  or  agreements,
understandings or arrangements or any other encumbrances whatsoever,  except for
any such encumbrances or proxies arising hereunder in favor of Cordiant.

                  (e) No Finder's Fees. No broker,  investment banker, financial
adviser  or other  person  is  entitled  to any  broker's,  finder's,  financial
adviser's or other similar fee or commission in connection with the transactions
contemplated  hereby  based  upon  arrangements  made  by or on  behalf  of  the
Stockholder  other than Bear Stearns & Co. Inc.,  the fees and expenses of which
shall be paid by the Company.

                  (f) Reliance by Cordiant and Sub. The Stockholder  understands
and acknowledges that Cordiant and Sub are entering into the Merger Agreement in
reliance upon the Stockholder's execution and delivery of this Agreement.

         6.   Additional  Covenants of the Stockholder.  The Stockholder  hereby
covenants to each of Cordiant and Sub as follows:

                  (a) No  Solicitation.  Subject to the provisions  contained in
Section 10 of this  Agreement,  the  Stockholder  shall not, in his  capacity as
such,   directly  or  indirectly,   solicit  (including  by  way  of  furnishing
information)  or respond to any  inquiries  or the making of any proposal by any
Person or entity (other than Cordiant or any affiliate of Cordiant) with respect
to the Company that constitutes a Takeover Proposal. If the Stockholder receives
any such  inquiry  or  proposal,  then the  Stockholder  shall  promptly  inform
Cordiant of the existence  thereof.  The Stockholder will immediately  cease and
cause to be terminated any existing activities, discussions or negotiations with
any parties conducted heretofore with respect to any of the foregoing.

                  (b)   Restriction   on   Transfer   of  Shares,   Proxies  and
Non-Interference.  Beginning on the date hereof and ending on the later to occur
of (A) last date the Stock Options are exercisable  pursuant to Section 3 hereof
and (B) the date that all of the Stockholder's  obligations under Section 2 have
terminated, except as contemplated by this Agreement or the Merger Agreement, no
Stockholder shall,  directly or indirectly,  (i) offer for sale, sell, transfer,
tender,  pledge,  encumber,  assign or  otherwise  dispose of, or enter into any
contract,  option or other  arrangement  or  understanding  with  respect  to or
consent to the offer for sale,  sale,  transfer,  tender,  pledge,  encumbrance,
assignment  or other  disposition  of, any or all of the Shares or any  interest
therein;  (ii) except as contemplated  by this  Agreement,  grant any proxies or
powers of attorney,  deposit any of the Shares into a voting trust or enter into
a voting  agreement with respect to any of the Shares;  or (iii) take any action
that would make any  representation  or  warranty of the  Stockholder  contained
herein  untrue or incorrect or have the effect of  preventing  or disabling  the
Stockholder from performing the Stockholder's  obligations under this Agreement.
Notwithstanding   anything  to  the  contrary  provided  in  this  Agreement,  a
Stockholder  shall have the right to make  Permitted  Transfers  of Shares.  The
Stockholder agrees with, and covenants to, Sub that beginning on the date hereof
and  ending on the last date the  Stock  Options  are  exercisable  pursuant  to
Section 3 hereof,  the Stockholder  shall not request that the Company  register
the transfer  (book-entry  or otherwise) of any  certificate  or  uncertificated
interest  representing  any of the  Shares,  unless  such  transfer  is  made in
compliance with this Agreement (including the provisions of Section 2 hereof).

                  (c) Additional  Shares.  The  Stockholder  agrees,  while this
Agreement is in effect (i) to notify  Cordiant and Sub promptly of the number of
any shares of Common  Stock  acquired by the  Stockholder  after the date hereof
(the "Additional  Shares") and (ii) to vote such Additional Shares in accordance
with Section 2 hereof. Such Additional Shares shall also be subject to the Stock
Option granted to Sub pursuant to Section 3 hereof and the restriction contained
in Section 6(b)(i) and (ii) above.

         7.   Representations  and Warranties of Cordiant and Sub.  Cordiant and
Sub hereby  covenant,  represent  and  warrant to the  Stockholder  that each of
Cordiant and Sub has the legal  capacity,  power and authority to enter into and
perform all of such party's  obligations  under this  Agreement;  the execution,
delivery and  performance of this Agreement by Cordiant and Sub will not violate
or result in a breach of any other  material  agreement to which Cordiant or Sub
is a party; the execution and delivery of this Agreement and the consummation of
the transactions  contemplated hereby (i) have been duly authorized by the board
of  directors  of  Cordiant  and Sub,  and (ii) do not and will not  violate any
provision of the certificate of incorporation or by-laws of Cordiant or Sub; and
this  Agreement  has been duly and validly  executed  and  delivered  by each of
Cordiant and Sub and  constitutes  a valid and binding  agreement of such party,
enforceable against such party in accordance with its terms.

         8.  Further Assurances. From time to time, at the other party's request
and without further  consideration,  each party hereto shall execute and deliver
such additional reasonable documents and take all such further reasonable lawful
action as may be necessary or desirable to consummate and make effective, in the
most  expeditious  manner  practicable,  the  transactions  contemplated by this
Agreement.

         9.   Termination;  Expenses and Fee. (a) The covenants  and  agreements
contained herein with respect to the Shares shall terminate (i) in the event the
Merger  Agreement  is  terminated  in  accordance  with  its  terms,  upon  such
termination,  except that the  provisions of Sections 2, 3 and 6(b) hereof shall
survive any such  termination  solely in accordance with their terms and (ii) in
the event the Merger is  consummated,  at the  Effective  Time,  except that the
provisions of Section 4 hereof shall survive any such termination,  provided, in
each case, that the provisions of Section 12 and Section 13 hereof shall survive
any termination of this Agreement, and provided, further, that no termination of
this Agreement shall relieve any party of liability for a breach hereof.

                  (b) Each party shall bear its own expenses in connection  with
  this Agreement and the transactions contemplated hereby.

         10.  Stockholder  Capacity.  The  Stockholder  is  not  executing  this
Agreement and does not make any agreement or understanding  herein in his or her
capacity as a director or officer of the  Company and nothing  contained  herein
shall limit or affect any actions taken by the  Stockholder in his capacity as a
director or officer of the Company to the extent such action is permitted by, or
not  prohibited  by,  the  Merger  Agreement,  and none of such  actions in such
capacities  shall be  deemed  to  constitute  a breach  of this  Agreement.  The
Stockholder  signs solely in his capacity as the record and beneficial owner of,
or the trustee of a trust whose  beneficiaries are the beneficial owners of, the
Shares.

         11. Sophistication. The Stockholder acknowledges that he is an informed
and sophisticated  investor and, together with his advisors, has undertaken such
investigation as they have deemed necessary,  including the review of the Merger
Agreement and this Agreement,  to enable the Stockholder to make an informed and
intelligent decision with respect to the Merger Agreement and this Agreement and
the transactions contemplated thereby and hereby.

         12.  Confidentiality.  Each  of  the  parties  hereto  recognizes  that
successful  consummation of the transactions  contemplated by this Agreement may
be  dependent  upon  confidentiality  with  respect to the  matters  referred to
herein. In this connection, pending public disclosure thereof, each party hereby
agrees not to disclose or discuss  such  matters with anyone not a party to this
Agreement or the Merger Agreement (other than such party's counsel and advisors,
if any) without the prior written consent of the other party, except for filings
required  pursuant to the Exchange Act and the rules and regulations  thereunder
or disclosures  such party's  counsel  advises are necessary in order to fulfill
such  party's  obligations  imposed by law, in which event such party shall give
notice of such disclosure to the other party as promptly as practicable so as to
enable the other  party to seek a  protective  order  from a court of  competent
jurisdiction with respect thereto.

         13.  Miscellaneous.

                  (a) Entire Agreement.  This Agreement and the Merger Agreement
constitute the entire agreement  between the parties with respect to the subject
matter hereof and supersede all other prior agreements and understandings,  both
written and oral, between the parties with respect to the subject matter hereof.

                  (b) Certain Events. The Stockholder agrees that this Agreement
and the obligations hereunder shall attach to the Stockholder's Shares and shall
be binding upon any person or entity to which legal or  beneficial  ownership of
such Shares shall pass,  whether by operation  of law or  otherwise,  including,
without  limitation,  the  Stockholder's  heirs,  guardians,  administrators  or
successors,  provided,  that following the Effective  Time, this Agreement shall
not be binding on any  purchaser of Shares in a  transaction  made in compliance
with Section 4(b), other than Permitted Transfers.  Notwithstanding any transfer
of  Shares,  the  transferor  shall  remain  liable for the  performance  of all
obligations under this Agreement of the transferor.

                  (c) Change in Control.  In the event that after the  Effective
Time (i) any Person or group of Persons  acting in  concert  (as  defined in the
City Code on Take-overs and Mergers in the United Kingdom)  acquires an interest
in the equity share capital of Cordiant (an "Acquiring Person") and, immediately
following such  acquisition,  such person,  or group,  holds shares  entitled to
exercise  more than 50% of the votes  which may be cast at a general  meeting of
Cordiant or (ii) a majority of the board of  directors  of Cordiant  immediately
prior  to  such  Person  becoming  an  Acquiring  Person,  cease  to  thereafter
constitute a majority of the board of directors of Cordiant  (other than through
elections of directors  whose  nomination  for election by the  shareholders  of
Cordiant  were  approved by the vote of a majority of  directors of Cordiant who
were either  directors prior to a Person  becoming an Acquiring  Person or whose
election or  nomination  for  election  was so  previously  approved),  then the
restrictions on Dispositions contained in Section 4, shall terminate without any
action on the part of any party hereto.

                  (d)  Assignment.  This  Agreement  shall  not be  assigned  by
operation of law or  otherwise  without the prior  written  consent of the other
party,  provided,  that Cordiant or Sub may assign, in its sole discretion,  its
rights  and  obligations  hereunder  to any  direct  or  indirect  wholly  owned
subsidiary of Cordiant,  but no such assignment shall relieve Cordiant or Sub of
its  obligations  hereunder  if such  assignee  does not or cannot  perform such
obligations.

                  (e)  Amendments,  Waivers,  Etc.  This  Agreement  may  not be
amended,  changed,  supplemented,  waived or otherwise  modified or  terminated,
except upon the  execution and delivery of a written  agreement  executed by the
party to be charged  thereby  or,  with  respect to  termination,  as  otherwise
provided herein.

                  (f) Notices. All notices,  requests, claims, demands and other
communications  hereunder  shall be in writing  and shall be given (and shall be
deemed to have been duly received if so given) by hand delivery, telegram, telex
or telecopy,  or by mail (registered or certified mail, postage prepaid,  return
receipt requested) or by any courier service, such as Federal Express, providing
proof of  delivery.  All  communications  hereunder  shall be  delivered  to the
respective parties at the following addresses:

         If to the Stockholder:     Michael Garnham
                                    c/o The Milton Group
                                    48 Broadway, Maidenhead,
                                    Berkshire SL6 1LU, UK
                                    Facsimile: 011-44-1628-630-298

                                    and

         If to Cordiant or
         Sub to:                    Cordiant Communications Group plc
                                    121-141 Westbourne Terrace
                                    London W2 6JR
                                    Attention: Deputy Finance Director
                                    Facsimile: +44-171-262-4300

         copy to:                   White & Case LLP
                                    1155 Avenue of the Americas
                                    New York, New York  10036-2787
                                    Attention:  Timothy B. Goodell, Esq.
                                    Facsimile:  (212) 354-8113

or to such  other  address  as the  person  to whom  notice  is  given  may have
previously furnished to the others in writing in the manner set forth above.

                  (g) Severability. Whenever possible, each provision or portion
of any provision of this  Agreement  will be interpreted in such manner as to be
effective and valid under  applicable law but if any provision or portion of any
provision of this Agreement is held to be invalid,  illegal or  unenforceable in
any  respect  under  any  applicable  law  or  rule  in any  jurisdiction,  such
invalidity,  illegality or unenforceability  will not affect any other provision
or portion of any provision in such  jurisdiction,  and this  Agreement  will be
reformed,  construed  and  enforced  in such  jurisdiction  as if such  invalid,
illegal or  unenforceable  provision or portion of any  provision had never been
contained herein.

                  (h)  Specific   Performance.   Each  of  the  parties   hereto
recognizes and  acknowledges  that a breach by it of any covenants or agreements
contained in this  Agreement will cause the aggrieved  party to sustain  damages
for which it would not have an  adequate  remedy at law for money  damages,  and
therefore each of the parties hereto agrees that in the event of any such breach
the aggrieved  party shall be entitled to the remedy of specific  performance of
such  covenants and agreements  and  injunctive  and other  equitable  relief in
addition to any other remedy to which it may be entitled, at law or in equity.

                  (i)  Remedies  Cumulative.  All  rights,  powers and  remedies
provided under this Agreement or otherwise available in respect hereof at law or
in equity  shall be  cumulative  and not  alternative,  and the  exercise of any
thereof by any party shall not preclude the  simultaneous  or later  exercise of
any other such right, power or remedy by such party.

                  (j) No Waiver. The failure of any party hereto to exercise any
right,  power or remedy provided under this Agreement or otherwise  available in
respect  hereof at law or in equity,  or to insist upon  compliance by any other
party hereto with its obligations  hereunder,  and any custom or practice of the
parties at variance with the terms hereof, shall not constitute a waiver by such
party of its right to exercise  any such or other  right,  power or remedy or to
demand such compliance.

                  (k)  No  Third  Party  Beneficiaries.  This  Agreement  is not
intended to be for the benefit of, and shall not be  enforceable  by, any person
or entity who or which is not a party hereto.

                  (l)  Governing  Law.  This  Agreement  shall be  governed  and
construed in accordance  with the laws of the State of New York,  without giving
effect to the principles of conflicts of law thereof.

                  (m) Jurisdiction. Each party hereby irrevocably submits to the
exclusive  jurisdiction of the Court of Chancery in the State of Delaware or the
United States District Court for the Southern  District of New York or any court
of the State of New York located in the City of New York in any action,  suit or
proceeding  arising in connection with this Agreement,  and agrees that any such
action,  suit or proceeding  shall be brought only in such court (and waives any
objection  based  on  forum  non  conveniens  or any  other  objection  to venue
therein); provided, however, that such consent to jurisdiction is solely for the
purpose  referred  to in this  paragraph  (1) and  shall  not be  deemed to be a
general  submission  to the  jurisdiction  of said  Courts  or in the  States of
Delaware  or New York other than for such  purposes.  Each party  hereto  hereby
waives any right to a trial by jury in connection with any such action,  suit or
proceeding.

                  (n) Descriptive Headings. The descriptive headings used herein
are inserted for  convenience  of reference only and are not intended to be part
of or to affect the meaning or interpretation of this Agreement.

                  (o)   Counterparts.   This   Agreement   may  be  executed  in
counterparts, each of which shall be deemed to be an original, but all of which,
taken together, shall constitute one and the same Agreement.


                         [SIGNATURES BEGIN ON NEXT PAGE]




<PAGE>


         IN WITNESS WHEREOF,  Cordiant, Sub and the Stockholder have caused this
Agreement to be duly executed as of the day and year first above written.


                                        CORDIANT COMMUNICATIONS GROUP PLC


                                        By: /s/ Arthur D'Angelo
                                            -------------------------------
                                            Name:  Arthur D'Angelo
                                            Title: Finance Director



                                        HEALTHWORLD ACQUISITION CORP.


                                        By: /s/ Arthur D'Angelo
                                            -------------------------------
                                            Name:  Arthur D'Angelo
                                            Title: President



                                        /s/ Michael Garnham
                                        -----------------------------------
                                        Michael Garnham


<PAGE>



             Schedule B to Stockholder Agreement of Michael Garnham



Michael  Garnham  has  pledged  74,300  of his  Shares  as  security  for a loan
obligation.






                                                                       EXHIBIT 6


                              STOCKHOLDER AGREEMENT


         AGREEMENT dated November 9, 1999, among Cordiant  Communications  Group
plc,  a company  organized  under the laws of  England  and Wales  ("Cordiant"),
Healthworld Acquisition Corporation,  a Delaware corporation and a direct wholly
owned subsidiary of Cordiant ("Sub"), and Steven Girgenti (the "Stockholder").

                              W I T N E S S E T H:

         WHEREAS,   concurrently  herewith,   Cordiant,   Sub,  and  Healthworld
Corporation,  a Delaware  corporation  (the  "Company"),  are  entering  into an
Agreement  and Plan of Merger (as such  agreement  may hereafter be amended from
time to time, the "Merger Agreement"), pursuant to which Sub will be merged with
and into the Company and the Company shall continue as the surviving corporation
(the "Merger");

         Whereas,  the  Stockholder  Beneficially  Owns,  as of the date hereof,
2,245,925  shares (the "Shares") of common stock,  $.01 par value per share,  of
the Company (the "Common Stock"); and

         WHEREAS,  as an inducement  and a condition to entering into the Merger
Agreement,  Cordiant and Sub have required that the Stockholder  agree,  and the
Stockholder has agreed, to enter into this Agreement;

         NOW,  THEREFORE,  in  consideration  of the  foregoing  and the  mutual
premises,  representations,   warranties,  covenants  and  agreements  contained
herein,  the parties  hereto,  intending  to be legally  bound,  hereby agree as
follows:

         1.   Definitions.  Unless other defined herein,  all capitalized  terms
  used  herein  shall  have  the  meanings  given to such  terms  in the  Merger
  Agreement. For purposes of this Agreement:

                  (a) "Beneficially Own" or "Beneficial  Ownership" with respect
to any securities  shall mean having  "beneficial  ownership" of such securities
(as determined pursuant to Rule 13d-3 under the Securities Exchange Act of 1934,
as  amended  (the  "Exchange  Act")),   including  pursuant  to  any  agreement,
arrangement or understanding, whether or not in writing.

         Without duplicative counting of the same securities by the same holder,
securities  Beneficially Owned by a Person shall include securities Beneficially
Owned by all other  Persons with whom such Person would  constitute a "group" as
within the meanings of Section 13(d)(3) of the Exchange Act.

                  (b) "Exchange Rate" means the average  currency  exchange rate
of pounds  sterling to US dollars based upon the noon buying rate in the City of
New York for cable  transfers in foreign  currencies as announced by the Federal
Reserve Bank of New York for customs  purposes over the 10  consecutive  Trading
Days  ending on the day on which the Stock  options  are  exercised  pursuant to
Section 3.

                  (c)  "Parent  Share  Value"  shall mean the product of (x) the
average of the closing  middle market  quotation of a Parent Share on the LSE as
reported in the Daily Official List of the London Stock Exchange for each of the
ten  consecutive  Trading Days ending on the day on which the Stock  Options are
exercised pursuant to Section 3 multiplied by (y) Exchange Rate.

                  (d) "Parent  Shares"  shall mean the ordinary  shares,  with a
nominal  value  of U.K.  fifty  pence  each  ("Ordinary  Shares"),  of  Cordiant
(including  any  options or other  rights to receive  Ordinary  Shares)  and the
American Depositary Shares, each representing the right to receive five Ordinary
Shares ("ADSs").

                  (e)   "Person"   shall   mean  an   individual,   corporation,
partnership,  limited  liability  company,  joint venture,  association,  trust,
unincorporated organization or other entity.

                  (f) "Share Value" shall be determined as follows:

                  (i)   if the  Parent  Share  Value is equal to or greater than
         $2.5054  and equal to or less than  $3.4838,  the Share  Value shall be
         $20.00;

                  (ii)  if  the  Parent Share Value is greater than $3.4838, the
         Share Value  shall be  $23.00; and

                  (iii) if  the  Parent Share Value  is  less  than $2.5054, the
         Share Value shall be $17.00

                  (g) "Trading Day" shall mean any day on which  securities  are
traded,  with  respect to ADSs,  on the New York Stock  Exchange,  Inc. and with
respect to Ordinary Shares, on the London Stock Exchange Limited.

         2.   Provisions  Concerning  Common Stock.  (a) The Stockholder  hereby
agrees that during the period  described in clause (b) below,  at any meeting of
the holders of Common Stock of the Company,  however  called,  or in  connection
with any written  consent of the  holders of Common  Stock of the  Company,  the
Stockholder  shall vote (or cause to be voted) the Shares of Common Stock of the
Company,  (i) in favor of the Merger,  the execution and delivery by the Company
of the Merger  Agreement  and the approval of the terms  thereof and each of the
other actions  contemplated  by the Merger  Agreement and this Agreement and any
actions required in furtherance  thereof and hereof;  (ii) against any action or
agreement that would result in a breach in any material respect of any covenant,
representation  or warranty or any other  obligation or agreement of the Company
under the Merger  Agreement  or this  Agreement;  and (iii)  except as otherwise
agreed to in writing  in advance by  Cordiant,  against  the  following  actions
(other  than  the  Merger  and  the  transactions  contemplated  by  the  Merger
Agreement):  (A) any  extraordinary  corporate  transaction,  such as a  merger,
consolidation  or  other  business  combination  involving  the  Company  or its
Subsidiaries;  (B) a sale,  lease or transfer of a material  amount of assets of
the  Company  or  its  Subsidiaries,  or  a  reorganization,   recapitalization,
dissolution or liquidation of the Company or its Subsidiaries; (C) any change in
a majority of the persons who  constitute the board of directors of the Company;
(D) any change in the present  capitalization of the Company or any amendment of
the Company's  Certificate of  Incorporation  or Bylaws;  (E) any other material
change in the Company's corporate structure or business; or (F) any other action
involving the Company or its Subsidiaries which is intended, or could reasonably
be  expected,  to  materially  impede,   interfere  with,  delay,  postpone,  or
materially adversely affect the Merger and the transactions contemplated by this
Agreement and the Merger  Agreement.  The  Stockholder  shall not enter into any
agreement  or  understanding  with any  Person  the  effect  of  which  would be
inconsistent  with or violative of the provisions  and  agreements  contained in
this Section 2.

         (b) The  obligations  of the  Stockholders  under clauses (i), (ii) and
(iii)(C),  (D), (E) and (F) of this Section 2 shall  terminate on the earlier to
occur of the  Effective  Time and the  termination  of the Merger  Agreement  in
accordance  with its terms.  The  obligations  of the  Stockholder  under clause
(iii)(A)  and (B) of this  Section 2 shall  terminate on the earlier to occur of
the Effective Time and 120 days after the termination of the Merger Agreement in
accordance  with its terms (unless the Merger  Agreement is terminated by reason
of the  failure  to  obtain  Parent  Shareholders'  Approval  in which  case the
Stockholder's  obligations  under this Section 2 shall terminate  simultaneously
with the termination of the Merger Agreement).

         3.   Option to Purchase.  In order to induce  Cordiant and Sub to enter
into the Merger Agreement,  the Stockholder  hereby grants to Sub an irrevocable
option (the "Stock  Options")  to  purchase,  all, and not less than all, of the
Shares at a purchase  price per share equal to the Share Value,  payable in cash
(the  "Purchase  Price"),  solely upon, and subject to, the terms and conditions
set forth below.  The Stock Options may only be exercised if Sub  simultaneously
exercises  all other  options held by it to purchase all, and not less than all,
of the shares of Common Stock covered by such  options.  The Stock Options shall
become  exercisable  solely in the event that the Merger Agreement is terminated
pursuant  to (i)  Section  9.1(b)(ii)  thereof,  but only if the  basis for such
termination  is the failure to obtain the Company  Stockholder  Approval or (ii)
Section  9.1(b)(iii)  thereof,  but only if the basis for such  termination is a
breach by the Company,  or the  Stockholder  materially  breaches any  agreement
contained in this Agreement, in which event the Stock Options shall, in any such
case, become immediately exercisable at any time and from time to time upon such
termination or upon Cordiant and Sub being informed of such breach,  as the case
may be, and until the date  which is 20 days after the date of such  termination
or the date on which  Cordiant and Sub are informed of such breach,  as the case
may be,  provided,  that if at the  expiration  of such 20-day  period the Stock
Options cannot be exercised by reason of any preliminary or final  injunction or
other order issued by any court or  governmental,  administrative  or regulatory
agency or authority  prohibiting  the exercise of the Stock Options  pursuant to
this  Agreement,  or because all  waiting  periods  under the  Hart-Scott-Rodino
Antitrust Improvements Act of 1976, as amended (the "HSR ACT"), required for the
purchase of the Shares upon such exercise shall not have expired or been waived,
the Stock Options shall be exercisable until 10 business days after the later of
the date on which such  impediment to exercise  shall have been removed or shall
have become final and not subject to appeal.  In all other instances,  the Stock
Options shall  terminate upon the  termination of the Merger  Agreement.  In the
event that Cordiant wishes to exercise the Stock Options,  Cordiant shall send a
written notice (the "Notice") to the  Stockholder  identifying  the place (which
shall be in New York City for each  Stockholder  who is a resident of the United
States  and in London  for each  Stockholder  who is a  resident  of the  United
Kingdom) and date (not less than two business days nor greater than ten business
days from the date of the  Notice)  for the  closing of such  purchase.  At such
closing,  Cordiant shall receive  certificates for the Shares, duly endorsed for
transfer,  and shall make  payment  therefor  by wire  transfer  of  immediately
available funds.

         4.  Disposition of Parent Shares.

                  (a)  Restrictions  on  Disposition.   The  Stockholder  hereby
agrees,  except as permitted in this Section 4(a) and Section 4(b) below, not to
directly or indirectly, offer to sell, contract to sell, transfer, assign, cause
to be  redeemed  or  otherwise  sell  or  dispose  of any of the  Parent  Shares
(collectively  a  "Disposition")  received by the stockholder in connection with
the  Merger  without  the prior  written  consent of  Cordiant.  Notwithstanding
anything to the contrary provided in this Agreement,  the Stockholder shall have
the right to  transfer  Parent  Shares  (i) to any  Family  Member,  (ii) to the
trustee or trustees of a trust solely (except for remote  contingent  interests)
for the benefit of the  Stockholder  and/or one or more Family  Members and/or a
charitable organization (a "Family Member Trust"), (iii) to a foundation created
or established by the Stockholder, or any other charitable organization, (iv) to
a  corporation  of which the  Stockholder  and/or any Family  Member  and/or any
Family Member Trust owns all of the outstanding  capital stock, (v) to a limited
liability  company of which the Stockholder  and/or any Family Member and/or any
Family Member Trust owns all of the outstanding membership interests,  (vi) to a
partnership of which the Stockholder  and/or any Family Member and/or any Family
Member  Trust  owns all of the  partnership  interests,  (vii) to the  executor,
administrator or personal representative of the estate of the Stockholder or any
other Family Member, or (viii) to any guardian, trustee or conservator appointed
with respect to the assets of the Stockholder, provided, that in the case of any
such  transfer,  the  transferee  shall  execute an agreement to be bound by the
terms of this  Agreement  (each  such  transfer,  a  "Permitted  Transfer"  and,
collectively,  the  "Permitted  Transfers").  For  purposes  of this  Agreement,
"Family  Member"  shall mean (a) the  Stockholder's  spouse,  if living with the
Stockholder,  (b) any one of the following:  the Stockholder's  father,  mother,
issue,  brother  or sister,  and the issue of a brother  or sister,  and (c) the
spouse of any  Family  Member  described  in (b) above,  if the spouse  shall be
living with that Family Member.  The  Stockholder  hereby agrees and consents to
the entry of stop transfer  instructions with Cordiant's  transfer agent against
the transfer of such Parent  Shares except in  compliance  with this  Agreement.
Notwithstanding  the  foregoing,  the  Stockholder  may pledge,  hypothecate  or
otherwise  grant a security  interest  in all or a portion of the Parent  Shares
beneficially owned by him during the term of this Agreement;  provided, however,
that any Person  receiving  such  Parent  Shares  shall be subject to all of the
restrictions  on  Disposition of such Parent Shares imposed by this Agreement to
the same extent as the Stockholder.

                  (b) Permitted Dispositions. The Stockholder may not effect any
Disposition of Parent Shares  received by the Stockholder in connection with the
Merger  except as  follows:  (i)  during  the  twelve-month  period  immediately
following the Effective Time the  Stockholder  may effect the Disposition of not
more than 10% of the Parent Shares  Beneficially  Owned by the  Stockholder  and
(ii) during the  twenty-four-month  period  immediately  following the Effective
Time (the "Period"), the Stockholder may effect the Disposition of not more than
50% of the  Parent  Shares  Beneficially  Owned  by the  Stockholder.  Upon  the
expiration of the Period,  the Stockholder may effect the Dispositions of all or
any  portion  of the  Parent  Shares  Beneficially  Owned by him  subject to any
applicable  restrictions  under the Federal  Securities Law and  restrictions of
general  application  under  English law, the Listing  Rules of the London Stock
Exchange,  if applicable,  and  Cordiant's  policies made pursuant to such rules
regarding  dealings in Parent  Shares by  directors  and  relevant  employees of
Cordiant and its subsidiaries,  if applicable.  Notwithstanding  anything to the
contrary contained in this Section 4, the Stockholder hereby agrees that for the
period commencing at the Effective Time and ending on the date which is 180 days
after the  expiration  of the  Period,  the  Stockholder  shall give  Cordiant 1
business day prior written  notice of any intended  Disposition of Parent Shares
to be made by the  Stockholder  and at the request of Cordiant  agrees to effect
such Disposition through brokers or other financial intermediaries designated by
Cordiant to maintain an orderly  trading market for the Parent Shares,  provided
that  such  financial  intermediary  agrees  to  effect  the  Disposition  in  a
reasonable period following such notice.

         5.  Representations and Warranties of the Stockholder.  The Stockholder
hereby represents and warrants to each of Cordiant and Sub as follows:

                  (a) Ownership of Shares.  The Stockholder is the record holder
of or Beneficially  Owns the Shares.  On the date hereof,  the Shares constitute
all of the shares of Common Stock owned of record or  Beneficially  Owned by the
Stockholder  (excluding  any Stock Options (as defined in the Merger  Agreement)
held by the  Stockholder).  The Stockholder has sole voting power and sole power
to issue instructions with respect to the matters set forth in Section 2 hereof,
sole power of  disposition,  sole power of  conversion,  sole power to  exercise
dissenters'  rights and sole power to agree to all of the  matters  set forth in
this  agreement,  in  each  case  with  respect  to all of the  Shares,  with no
limitations,   qualifications  or  restrictions  on  such  rights,   subject  to
applicable securities laws and the terms of this Agreement.

                  (b) Power;  Binding  Agreement.  The Stockholder has the legal
capacity,  power and authority to enter into and perform all of his  obligations
under this Agreement. The execution,  delivery and performance of this Agreement
by the Stockholder will not violate any other Agreement to which the Stockholder
is a party including,  without  limitation,  any voting agreement,  shareholders
agreement or voting trust. This Agreement has been duly and validly executed and
delivered by the Stockholder  and  constitutes a valid and binding  agreement of
the  Stockholder,  enforceable  against the  Stockholder in accordance  with its
terms  except  that  such  enforceability  (i)  may be  limited  by  bankruptcy,
insolvency,  moratorium  or other similar laws  relating to the  enforcement  of
creditors' rights generally and (ii) is subject to general  principles of equity
and  discretion  of the court before which any  proceedings  seeking  injunctive
relief or specific  performance may be sought. There is no beneficiary or holder
of a voting  trust  certificate  or other  interest  of any  trust of which  the
Stockholder  is trustee whose consent is required for the execution and delivery
of this agreement or the  consummation  by the  Stockholder of the  transactions
contemplated  hereby. If the Stockholder is married and the Stockholder's Shares
constitute community property, this agreement has been duly authorized, executed
and  delivered  by,  and  constitutes  a valid and  binding  agreement  of,  the
Stockholder's  spouse,  enforceable  against such Person in accordance  with its
terms  except  that  such  enforceability  (i)  may be  limited  by  bankruptcy,
insolvency,  moratorium  or other similar laws  relating to the  enforcement  of
creditors' rights generally and (ii) is subject to general  principles of equity
and  discretion  of the court before which any  proceedings  seeking  injunctive
relief or specific performance may be sought.

                  (c) No Conflicts. Except for filings, permits, authorizations,
consents and  approvals  under the HSR Act and the  Securities  Act of 1933,  if
applicable,  (A) no  filing  with,  and no  permit,  authorization,  consent  or
approval of, any state or federal  public body or authority is necessary for the
execution  of this  Agreement by the  Stockholder  and the  consummation  by the
Stockholder  of  the  transactions  contemplated  hereby  and  (B)  none  of the
execution and delivery of this Agreement by the Stockholder, the consummation by
the  Stockholder of the  transactions  contemplated  hereby or compliance by the
Stockholder with any of the provisions  hereof shall, in a manner which would be
material  and  adverse  to the  ability of the  Stockholder  to  consummate  the
transactions contemplated hereby or to comply with the terms hereof, result in a
violation or breach of, or constitute  (with or without  notice or lapse of time
or both) a  default  (or give  rise to any  third  party  right of  termination,
cancellation,  material  modification or  acceleration)  under any of the terms,
conditions  or  provisions  of any note,  bond,  mortgage,  indenture,  license,
contract, commitment, arrangement,  understanding, agreement or other instrument
or  obligation of any kind to which the  Stockholder  is a party or by which the
Stockholder or any of the  Stockholder's  properties or assets may be bound,  or
(3) violate any order, writ, injunction,  decree, judgment, order, statute, rule
or  regulation  applicable  to the  Stockholder  or  any  of  the  Stockholder's
properties or assets.

                  (d) No  Encumbrances.  Except as applicable in connection with
the  transactions  contemplated  hereby or as set forth on  Schedule  B attached
hereto, the Shares and the certificates  representing the Shares are now, and at
all times  during the term  hereof  will be,  held by the  Stockholder,  or by a
nominee or custodian for the benefit of the  Stockholder,  free and clear of all
liens,  claims,  security  interests,  proxies,  voting  trusts  or  agreements,
understandings or arrangements or any other encumbrances whatsoever,  except for
any such encumbrances or proxies arising hereunder in favor of Cordiant.

                  (e) No Finder's Fees. No broker,  investment banker, financial
adviser  or other  person  is  entitled  to any  broker's,  finder's,  financial
adviser's or other similar fee or commission in connection with the transactions
contemplated  hereby  based  upon  arrangements  made  by or on  behalf  of  the
Stockholder  other than Bear Stearns & Co. Inc.,  the fees and expenses of which
shall be paid by the Company.

                  (f) Reliance by Cordiant and Sub. The Stockholder  understands
and acknowledges that Cordiant and Sub are entering into the Merger Agreement in
reliance upon the Stockholder's execution and delivery of this Agreement.

         6.   Additional  Covenants of the Stockholder.  The Stockholder  hereby
covenants to each of Cordiant and Sub as follows:

                  (a) No  Solicitation.  Subject to the provisions  contained in
Section 10 of this  Agreement,  the  Stockholder  shall not, in his  capacity as
such,   directly  or  indirectly,   solicit  (including  by  way  of  furnishing
information)  or respond to any  inquiries  or the making of any proposal by any
Person or entity (other than Cordiant or any affiliate of Cordiant) with respect
to the Company that constitutes a Takeover Proposal. If the Stockholder receives
any such  inquiry  or  proposal,  then the  Stockholder  shall  promptly  inform
Cordiant of the existence  thereof.  The Stockholder will immediately  cease and
cause to be terminated any existing activities, discussions or negotiations with
any parties conducted heretofore with respect to any of the foregoing.

                  (b)   Restriction   on   Transfer   of  Shares,   Proxies  and
Non-Interference.  Beginning on the date hereof and ending on the later to occur
of (A) last date the Stock Options are exercisable  pursuant to Section 3 hereof
and (B) the date that all of the Stockholder's  obligations under Section 2 have
terminated, except as contemplated by this Agreement or the Merger Agreement, no
Stockholder shall,  directly or indirectly,  (i) offer for sale, sell, transfer,
tender,  pledge,  encumber,  assign or  otherwise  dispose of, or enter into any
contract,  option or other  arrangement  or  understanding  with  respect  to or
consent to the offer for sale,  sale,  transfer,  tender,  pledge,  encumbrance,
assignment  or other  disposition  of, any or all of the Shares or any  interest
therein;  (ii) except as contemplated  by this  Agreement,  grant any proxies or
powers of attorney,  deposit any of the Shares into a voting trust or enter into
a voting  agreement with respect to any of the Shares;  or (iii) take any action
that would make any  representation  or  warranty of the  Stockholder  contained
herein  untrue or incorrect or have the effect of  preventing  or disabling  the
Stockholder from performing the Stockholder's  obligations under this Agreement.
Notwithstanding   anything  to  the  contrary  provided  in  this  Agreement,  a
Stockholder  shall have the right to make  Permitted  Transfers  of Shares.  The
Stockholder agrees with, and covenants to, Sub that beginning on the date hereof
and  ending on the last date the  Stock  Options  are  exercisable  pursuant  to
Section 3 hereof,  the Stockholder  shall not request that the Company  register
the transfer  (book-entry  or otherwise) of any  certificate  or  uncertificated
interest  representing  any of the  Shares,  unless  such  transfer  is  made in
compliance with this Agreement (including the provisions of Section 2 hereof).

                  (c) Additional  Shares.  The  Stockholder  agrees,  while this
Agreement is in effect (i) to notify  Cordiant and Sub promptly of the number of
any shares of Common  Stock  acquired by the  Stockholder  after the date hereof
(the "Additional  Shares") and (ii) to vote such Additional Shares in accordance
with Section 2 hereof. Such Additional Shares shall also be subject to the Stock
Option granted to Sub pursuant to Section 3 hereof and the restriction contained
in Section 6(b)(i) and (ii) above.

         7.   Representations  and Warranties of Cordiant and Sub.  Cordiant and
Sub hereby  covenant,  represent  and  warrant to the  Stockholder  that each of
Cordiant and Sub has the legal  capacity,  power and authority to enter into and
perform all of such party's  obligations  under this  Agreement;  the execution,
delivery and  performance of this Agreement by Cordiant and Sub will not violate
or result in a breach of any other  material  agreement to which Cordiant or Sub
is a party; the execution and delivery of this Agreement and the consummation of
the transactions  contemplated hereby (i) have been duly authorized by the board
of  directors  of  Cordiant  and Sub,  and (ii) do not and will not  violate any
provision of the certificate of incorporation or by-laws of Cordiant or Sub; and
this  Agreement  has been duly and validly  executed  and  delivered  by each of
Cordiant and Sub and  constitutes  a valid and binding  agreement of such party,
enforceable against such party in accordance with its terms.

         8.  Further Assurances. From time to time, at the other party's request
and without further  consideration,  each party hereto shall execute and deliver
such additional reasonable documents and take all such further reasonable lawful
action as may be necessary or desirable to consummate and make effective, in the
most  expeditious  manner  practicable,  the  transactions  contemplated by this
Agreement.

         9.   Termination;  Expenses and Fee. (a) The covenants  and  agreements
contained herein with respect to the Shares shall terminate (i) in the event the
Merger  Agreement  is  terminated  in  accordance  with  its  terms,  upon  such
termination,  except that the  provisions of Sections 2, 3 and 6(b) hereof shall
survive any such  termination  solely in accordance with their terms and (ii) in
the event the Merger is  consummated,  at the  Effective  Time,  except that the
provisions of Section 4 hereof shall survive any such termination,  provided, in
each case, that the provisions of Section 12 and Section 13 hereof shall survive
any termination of this Agreement, and provided, further, that no termination of
this Agreement shall relieve any party of liability for a breach hereof.

         (b) Each party shall bear its own  expenses  in  connection  with  this
Agreement and the transactions contemplated hereby.

         10.  Stockholder  Capacity.  The  Stockholder  is  not  executing  this
Agreement and does not make any agreement or understanding  herein in his or her
capacity as a director or officer of the  Company and nothing  contained  herein
shall limit or affect any actions taken by the  Stockholder in his capacity as a
director or officer of the Company to the extent such action is permitted by, or
not  prohibited  by,  the  Merger  Agreement,  and none of such  actions in such
capacities  shall be  deemed  to  constitute  a breach  of this  Agreement.  The
Stockholder  signs solely in his capacity as the record and beneficial owner of,
or the trustee of a trust whose  beneficiaries are the beneficial owners of, the
Shares.

         11. Sophistication. The Stockholder acknowledges that he is an informed
and sophisticated  investor and, together with his advisors, has undertaken such
investigation as they have deemed necessary,  including the review of the Merger
Agreement and this Agreement,  to enable the Stockholder to make an informed and
intelligent decision with respect to the Merger Agreement and this Agreement and
the transactions contemplated thereby and hereby.

         12.  Confidentiality.  Each  of  the  parties  hereto  recognizes  that
successful  consummation of the transactions  contemplated by this Agreement may
be  dependent  upon  confidentiality  with  respect to the  matters  referred to
herein. In this connection, pending public disclosure thereof, each party hereby
agrees not to disclose or discuss  such  matters with anyone not a party to this
Agreement or the Merger Agreement (other than such party's counsel and advisors,
if any) without the prior written consent of the other party, except for filings
required  pursuant to the Exchange Act and the rules and regulations  thereunder
or disclosures  such party's  counsel  advises are necessary in order to fulfill
such  party's  obligations  imposed by law, in which event such party shall give
notice of such disclosure to the other party as promptly as practicable so as to
enable the other  party to seek a  protective  order  from a court of  competent
jurisdiction with respect thereto.

         13.  Miscellaneous.

                  (a) Entire Agreement.  This Agreement and the Merger Agreement
constitute the entire agreement  between the parties with respect to the subject
matter hereof and supersede all other prior agreements and understandings,  both
written and oral, between the parties with respect to the subject matter hereof.

                  (b) Certain Events. The Stockholder agrees that this Agreement
and the obligations hereunder shall attach to the Stockholder's Shares and shall
be binding upon any person or entity to which legal or  beneficial  ownership of
such Shares shall pass,  whether by operation  of law or  otherwise,  including,
without  limitation,  the  Stockholder's  heirs,  guardians,  administrators  or
successors,  provided,  that following the Effective  Time, this Agreement shall
not be binding on any  purchaser of Shares in a  transaction  made in compliance
with Section 4(b), other than Permitted Transfers.  Notwithstanding any transfer
of  Shares,  the  transferor  shall  remain  liable for the  performance  of all
obligations under this Agreement of the transferor.

                  (c) Change in Control.  In the event that after the  Effective
Time (i) any Person or group of Persons  acting in  concert  (as  defined in the
City Code on Take-overs and Mergers in the United Kingdom)  acquires an interest
in the equity share capital of Cordiant (an "Acquiring Person") and, immediately
following such  acquisition,  such person,  or group,  holds shares  entitled to
exercise  more than 50% of the votes  which may be cast at a general  meeting of
Cordiant or (ii) a majority of the board of  directors  of Cordiant  immediately
prior  to  such  Person  becoming  an  Acquiring  Person,  cease  to  thereafter
constitute a majority of the board of directors of Cordiant  (other than through
elections of directors  whose  nomination  for election by the  shareholders  of
Cordiant  were  approved by the vote of a majority of  directors of Cordiant who
were either  directors prior to a Person  becoming an Acquiring  Person or whose
election or  nomination  for  election  was so  previously  approved),  then the
restrictions on Dispositions contained in Section 4, shall terminate without any
action on the part of any party hereto.

                  (d)  Assignment.  This  Agreement  shall  not be  assigned  by
operation of law or  otherwise  without the prior  written  consent of the other
party,  provided,  that Cordiant or Sub may assign, in its sole discretion,  its
rights  and  obligations  hereunder  to any  direct  or  indirect  wholly  owned
subsidiary of Cordiant,  but no such assignment shall relieve Cordiant or Sub of
its  obligations  hereunder  if such  assignee  does not or cannot  perform such
obligations.

                  (e)  Amendments,  Waivers,  Etc.  This  Agreement  may  not be
amended,  changed,  supplemented,  waived or otherwise  modified or  terminated,
except upon the  execution and delivery of a written  agreement  executed by the
party to be charged  thereby  or,  with  respect to  termination,  as  otherwise
provided herein.

                  (f) Notices. All notices,  requests, claims, demands and other
communications  hereunder  shall be in writing  and shall be given (and shall be
deemed to have been duly received if so given) by hand delivery, telegram, telex
or telecopy,  or by mail (registered or certified mail, postage prepaid,  return
receipt requested) or by any courier service, such as Federal Express, providing
proof of  delivery.  All  communications  hereunder  shall be  delivered  to the
respective parties at the following addresses:

         If to the Stockholder:     Steven Girgenti
                                    c/o Healthworld Corporation
                                    100 Avenue of the Americas
                                    New York, New York 10010
                                    Attention: Steven Girgenti
                                    Facsimile: (212) 966-2743

         and

         If to Cordiant or
         Sub to:                    Cordiant Communications Group plc
                                    121-141 Westbourne Terrace
                                    London W2 6JR
                                    Attention: Deputy Finance Director
                                    Facsimile: +44-171-262-4300

         copy to:                   White & Case LLP
                                    1155 Avenue of the Americas
                                    New York, New York  10036-2787
                                    Attention:  Timothy B. Goodell, Esq.
                                    Facsimile:  (212) 354-8113

or to such  other  address  as the  person  to whom  notice  is  given  may have
previously furnished to the others in writing in the manner set forth above.

                  (g) Severability. Whenever possible, each provision or portion
of any provision of this  Agreement  will be interpreted in such manner as to be
effective and valid under  applicable law but if any provision or portion of any
provision of this Agreement is held to be invalid,  illegal or  unenforceable in
any  respect  under  any  applicable  law  or  rule  in any  jurisdiction,  such
invalidity,  illegality or unenforceability  will not affect any other provision
or portion of any provision in such  jurisdiction,  and this  Agreement  will be
reformed,  construed  and  enforced  in such  jurisdiction  as if such  invalid,
illegal or  unenforceable  provision or portion of any  provision had never been
contained herein.

                  (h)  Specific   Performance.   Each  of  the  parties   hereto
recognizes and  acknowledges  that a breach by it of any covenants or agreements
contained in this  Agreement will cause the aggrieved  party to sustain  damages
for which it would not have an  adequate  remedy at law for money  damages,  and
therefore each of the parties hereto agrees that in the event of any such breach
the aggrieved  party shall be entitled to the remedy of specific  performance of
such  covenants and agreements  and  injunctive  and other  equitable  relief in
addition to any other remedy to which it may be entitled, at law or in equity.

                  (i)  Remedies  Cumulative.  All  rights,  powers and  remedies
provided under this Agreement or otherwise available in respect hereof at law or
in equity  shall be  cumulative  and not  alternative,  and the  exercise of any
thereof by any party shall not preclude the  simultaneous  or later  exercise of
any other such right, power or remedy by such party.

                  (j) No Waiver. The failure of any party hereto to exercise any
right,  power or remedy provided under this Agreement or otherwise  available in
respect  hereof at law or in equity,  or to insist upon  compliance by any other
party hereto with its obligations  hereunder,  and any custom or practice of the
parties at variance with the terms hereof, shall not constitute a waiver by such
party of its right to exercise  any such or other  right,  power or remedy or to
demand such compliance.

                  (k)  No  Third  Party  Beneficiaries.  This  Agreement  is not
intended to be for the benefit of, and shall not be  enforceable  by, any person
or entity who or which is not a party hereto.

                  (l)  Governing  Law.  This  Agreement  shall be  governed  and
construed in accordance  with the laws of the State of New York,  without giving
effect to the principles of conflicts of law thereof.

                  (m) Jurisdiction. Each party hereby irrevocably submits to the
exclusive  jurisdiction of the Court of Chancery in the State of Delaware or the
United States District Court for the Southern  District of New York or any court
of the State of New York located in the City of New York in any action,  suit or
proceeding  arising in connection with this Agreement,  and agrees that any such
action,  suit or proceeding  shall be brought only in such court (and waives any
objection  based  on  forum  non  conveniens  or any  other  objection  to venue
therein); provided, however, that such consent to jurisdiction is solely for the
purpose  referred  to in this  paragraph  (1) and  shall  not be  deemed to be a
general  submission  to the  jurisdiction  of said  Courts  or in the  States of
Delaware  or New York other than for such  purposes.  Each party  hereto  hereby
waives any right to a trial by jury in connection with any such action,  suit or
proceeding.

                  (n) Descriptive Headings. The descriptive headings used herein
are inserted for  convenience  of reference only and are not intended to be part
of or to affect the meaning or interpretation of this Agreement.

                  (o)   Counterparts.   This   Agreement   may  be  executed  in
counterparts, each of which shall be deemed to be an original, but all of which,
taken together, shall constitute one and the same Agreement.


                         [SIGNATURES BEGIN ON NEXT PAGE]




<PAGE>


         IN WITNESS WHEREOF,  Cordiant, Sub and the Stockholder have caused this
Agreement to be duly executed as of the day and year first above written.


                                        CORDIANT COMMUNICATIONS GROUP PLC


                                        By: /s/ Arthur D'Angelo
                                            ------------------------------
                                            Name:  Arthur D'Angelo
                                            Title: Finance Director



                                        HEALTHWORLD ACQUISITION CORP.


                                        By: /s/ Arthur D'Angelo
                                            ------------------------------
                                            Name:  Arthur D'Angelo
                                            Title: President



                                        /s/ Steven Girgenti
                                        ----------------------------------
                                        Steven Girgenti


<PAGE>


             Schedule B to Stockholder Agreement of Steven Girgenti



Steven  Girgenti  has  pledged  225,000  of his  Shares as  security  for a loan
obligation.





                                                                       EXHIBIT 7


                              STOCKHOLDER AGREEMENT


         AGREEMENT dated November 9, 1999, among Cordiant  Communications  Group
plc,  a company  organized  under the laws of  England  and Wales  ("Cordiant"),
Healthworld Acquisition Corporation,  a Delaware corporation and a direct wholly
owned subsidiary of Cordiant ("Sub"), and Francis Hughes (the "Stockholder").

                              W I T N E S S E T H:

         WHEREAS,   concurrently  herewith,   Cordiant,   Sub,  and  Healthworld
Corporation,  a Delaware  corporation  (the  "Company"),  are  entering  into an
Agreement  and Plan of Merger (as such  agreement  may hereafter be amended from
time to time, the "Merger Agreement"), pursuant to which Sub will be merged with
and into the Company and the Company shall continue as the surviving corporation
(the "Merger");

         Whereas,  the  Stockholder  Beneficially  Owns,  as of the date hereof,
207,500 shares (the "Shares") of common stock,  $.01 par value per share, of the
Company (the "Common Stock"); and

         WHEREAS,  as an inducement  and a condition to entering into the Merger
Agreement,  Cordiant and Sub have required that the Stockholder  agree,  and the
Stockholder has agreed, to enter into this Agreement;

         NOW,  THEREFORE,  in  consideration  of the  foregoing  and the  mutual
premises,  representations,   warranties,  covenants  and  agreements  contained
herein,  the parties  hereto,  intending  to be legally  bound,  hereby agree as
follows:

         1. Definitions. Unless other defined herein, all capitalized terms used
herein shall have the meanings given to such terms in the Merger Agreement.  For
purposes of this Agreement:

                  (a) "Beneficially Own" or "Beneficial  Ownership" with respect
to any securities  shall mean having  "beneficial  ownership" of such securities
(as determined pursuant to Rule 13d-3 under the Securities Exchange Act of 1934,
as  amended  (the  "Exchange  Act")),   including  pursuant  to  any  agreement,
arrangement or understanding, whether or not in writing.

         Without duplicative counting of the same securities by the same holder,
securities  Beneficially Owned by a Person shall include securities Beneficially
Owned by all other  Persons with whom such Person would  constitute a "group" as
within the meanings of Section 13(d)(3) of the Exchange Act.

                  (b) "Exchange Rate" means the average  currency  exchange rate
of pounds  sterling to US dollars based upon the noon buying rate in the City of
New York for cable  transfers in foreign  currencies as announced by the Federal
Reserve Bank of New York for customs  purposes over the 10  consecutive  Trading
Days  ending on the day on which the Stock  Options  are  exercised  pursuant to
Section 3.

                  (c)  "Parent  Share  Value"  shall mean the product of (x) the
average of the closing  middle market  quotation of a Parent Share on the LSE as
reported in the Daily Official List of the London Stock Exchange for each of the
ten  consecutive  Trading Days ending on the day on which the Stock  Options are
exercised pursuant to Section 3 multiplied by (y) Exchange Rate.

                  (d) "Parent  Shares"  shall mean the ordinary  shares,  with a
nominal  value  of U.K.  fifty  pence  each  ("Ordinary  Shares"),  of  Cordiant
(including  any  options or other  rights to receive  Ordinary  Shares)  and the
American Depositary Shares, each representing the right to receive five Ordinary
Shares ("ADSs").

                  (e)   "Person"   shall   mean  an   individual,   corporation,
partnership,  limited  liability  company,  joint venture,  association,  trust,
unincorporated organization or other entity.

                  (f) "Share Value" shall be determined as follows:

                  (i)   if the Parent Share  Value is equal to or  greater  than
         $2.5054  and equal to or less than  $3.4838,  the Share  Value shall be
         $20.00;

                  (ii)  if  the  Parent Share Value is greater than $3.4838, the
         Share Value  shall be  $23.00; and

                  (iii) if  the  Parent  Share  Value  is less than $2.5054, the
         Share Value shall be $17.00.

                  (g) "Trading Day" shall mean any day on which  securities  are
traded,  with  respect to ADSs,  on the New York Stock  Exchange,  Inc. and with
respect to Ordinary Shares, on the London Stock Exchange Limited.

         2.   Provisions  Concerning  Common Stock.  (a) The Stockholder  hereby
agrees that during the period  described in clause (b) below,  at any meeting of
the holders of Common Stock of the Company,  however  called,  or in  connection
with any written  consent of the  holders of Common  Stock of the  Company,  the
Stockholder  shall vote (or cause to be voted) the Shares of Common Stock of the
Company,  (i) in favor of the Merger,  the execution and delivery by the Company
of the Merger  Agreement  and the approval of the terms  thereof and each of the
other actions  contemplated  by the Merger  Agreement and this Agreement and any
actions required in furtherance  thereof and hereof;  (ii) against any action or
agreement that would result in a breach in any material respect of any covenant,
representation  or warranty or any other  obligation or agreement of the Company
under the Merger  Agreement  or this  Agreement;  and (iii)  except as otherwise
agreed to in writing  in advance by  Cordiant,  against  the  following  actions
(other  than  the  Merger  and  the  transactions  contemplated  by  the  Merger
Agreement):  (A) any  extraordinary  corporate  transaction,  such as a  merger,
consolidation  or  other  business  combination  involving  the  Company  or its
Subsidiaries;  (B) a sale,  lease or transfer of a material  amount of assets of
the  Company  or  its  Subsidiaries,  or  a  reorganization,   recapitalization,
dissolution or liquidation of the Company or its Subsidiaries; (C) any change in
a majority of the persons who  constitute the board of directors of the Company;
(D) any change in the present  capitalization of the Company or any amendment of
the Company's  Certificate of  Incorporation  or Bylaws;  (E) any other material
change in the Company's corporate structure or business; or (F) any other action
involving the Company or its Subsidiaries which is intended, or could reasonably
be  expected,  to  materially  impede,   interfere  with,  delay,  postpone,  or
materially adversely affect the Merger and the transactions contemplated by this
Agreement and the Merger  Agreement.  The  Stockholder  shall not enter into any
agreement  or  understanding  with any  Person  the  effect  of  which  would be
inconsistent  with or violative of the provisions  and  agreements  contained in
this Section 2.

         (b) The  obligations  of the  Stockholders  under clauses (i), (ii) and
(iii)(C),  (D), (E) and (F) of this Section 2 shall  terminate on the earlier to
occur of the  Effective  Time and the  termination  of the Merger  Agreement  in
accordance  with its terms.  The  obligations  of the  Stockholder  under clause
(iii)(A)  and (B) of this  Section 2 shall  terminate on the earlier to occur of
the Effective Time and 120 days after the termination of the Merger Agreement in
accordance  with its terms (unless the Merger  Agreement is terminated by reason
of the  failure  to  obtain  Parent  Shareholders'  Approval  in which  case the
Stockholder's  obligations  under this Section 2 shall terminate  simultaneously
with the termination of the Merger Agreement).

         3.   Option to Purchase.  In order to induce  Cordiant and Sub to enter
into the Merger Agreement,  the Stockholder  hereby grants to Sub an irrevocable
option (the "Stock  Options")  to  purchase,  all, and not less than all, of the
Shares at a purchase  price per share equal to the Share Value,  payable in cash
(the  "Purchase  Price"),  solely upon, and subject to, the terms and conditions
set forth below.  The Stock Options may only be exercised if Sub  simultaneously
exercises  all other  options held by it to purchase all, and not less than all,
of the shares of Common Stock covered by such  options.  The Stock Options shall
become  exercisable  solely in the event that the Merger Agreement is terminated
pursuant  to (i)  Section  9.1(b)(ii)  thereof,  but only if the  basis for such
termination  is the failure to obtain the Company  Stockholder  Approval or (ii)
Section  9.1(b)(iii)  thereof,  but only if the basis for such  termination is a
breach by the Company,  or the  Stockholder  materially  breaches any  agreement
contained in this Agreement, in which event the Stock Options shall, in any such
case, become immediately exercisable at any time and from time to time upon such
termination or upon Cordiant and Sub being informed of such breach,  as the case
may be, and until the date  which is 20 days after the date of such  termination
or the date on which  Cordiant and Sub are informed of such breach,  as the case
may be,  provided,  that if at the  expiration  of such 20-day  period the Stock
Options cannot be exercised by reason of any preliminary or final  injunction or
other order issued by any court or  governmental,  administrative  or regulatory
agency or authority  prohibiting  the exercise of the Stock Options  pursuant to
this  Agreement,  or because all  waiting  periods  under the  Hart-Scott-Rodino
Antitrust Improvements Act of 1976, as amended (the "HSR ACT"), required for the
purchase of the Shares upon such exercise shall not have expired or been waived,
the Stock Options shall be exercisable until 10 business days after the later of
the date on which such  impediment to exercise  shall have been removed or shall
have become final and not subject to appeal.  In all other instances,  the Stock
Options shall  terminate upon the  termination of the Merger  Agreement.  In the
event that Cordiant wishes to exercise the Stock Options,  Cordiant shall send a
written notice (the "Notice") to the  Stockholder  identifying  the place (which
shall be in New York City for each  Stockholder  who is a resident of the United
States  and in London  for each  Stockholder  who is a  resident  of the  United
Kingdom) and date (not less than two business days nor greater than ten business
days from the date of the  Notice)  for the  closing of such  purchase.  At such
closing,  Cordiant shall receive  certificates for the Shares, duly endorsed for
transfer,  and shall make  payment  therefor  by wire  transfer  of  immediately
available funds.

         4.  Disposition of Parent Shares.

                  (a)  Restrictions  on  Disposition.   The  Stockholder  hereby
agrees,  except as permitted in this Section 4(a) and Section 4(b) below, not to
directly or indirectly, offer to sell, contract to sell, transfer, assign, cause
to be  redeemed  or  otherwise  sell  or  dispose  of any of the  Parent  Shares
(collectively  a  "Disposition")  received by the stockholder in connection with
the  Merger  without  the prior  written  consent of  Cordiant.  Notwithstanding
anything to the contrary provided in this Agreement,  the Stockholder shall have
the right to  transfer  Parent  Shares  (i) to any  Family  Member,  (ii) to the
trustee or trustees of a trust solely (except for remote  contingent  interests)
for the benefit of the  Stockholder  and/or one or more Family  Members and/or a
charitable organization (a "Family Member Trust"), (iii) to a foundation created
or established by the Stockholder, or any other charitable organization, (iv) to
a  corporation  of which the  Stockholder  and/or any Family  Member  and/or any
Family Member Trust owns all of the outstanding  capital stock, (v) to a limited
liability  company of which the Stockholder  and/or any Family Member and/or any
Family Member Trust owns all of the outstanding membership interests,  (vi) to a
partnership of which the Stockholder  and/or any Family Member and/or any Family
Member  Trust  owns all of the  partnership  interests,  (vii) to the  executor,
administrator or personal representative of the estate of the Stockholder or any
other Family Member, or (viii) to any guardian, trustee or conservator appointed
with respect to the assets of the Stockholder, provided, that in the case of any
such  transfer,  the  transferee  shall  execute an agreement to be bound by the
terms of this  Agreement  (each  such  transfer,  a  "Permitted  Transfer"  and,
collectively,  the  "Permitted  Transfers").  For  purposes  of this  Agreement,
"Family  Member"  shall mean (a) the  Stockholder's  spouse,  if living with the
Stockholder,  (b) any one of the following:  the Stockholder's  father,  mother,
issue,  brother  or sister,  and the issue of a brother  or sister,  and (c) the
spouse of any  Family  Member  described  in (b) above,  if the spouse  shall be
living with that Family Member.  The  Stockholder  hereby agrees and consents to
the entry of stop transfer  instructions with Cordiant's  transfer agent against
the transfer of such Parent  Shares except in  compliance  with this  Agreement.
Notwithstanding  the  foregoing,  the  Stockholder  may pledge,  hypothecate  or
otherwise  grant a security  interest  in all or a portion of the Parent  Shares
beneficially owned by him during the term of this Agreement;  provided, however,
that any Person  receiving  such  Parent  Shares  shall be subject to all of the
restrictions  on  Disposition of such Parent Shares imposed by this Agreement to
the same extent as the Stockholder.

                  (b) Permitted Dispositions. The Stockholder may not effect any
Disposition of Parent Shares  received by the Stockholder in connection with the
Merger except as follows:  during the twelve-month period immediately  following
the Effective Time (the "Period") the  Stockholder may effect the Disposition of
not more than 30% of the Parent Shares  Beneficially  Owned by the  Stockholder.
Upon the expiration of the Period,  the Stockholder may effect the  Dispositions
of all or any portion of the Parent Shares  Beneficially Owned by him subject to
any applicable restrictions under the Federal Securities Law and restrictions of
general  application  under  English law, the Listing  Rules of the London Stock
Exchange,  if applicable,  and  Cordiant's  policies made pursuant to such rules
regarding  dealings in Parent  Shares by  directors  and  relevant  employees of
Cordiant and its subsidiaries,  if applicable.  Notwithstanding  anything to the
contrary contained in this Section 4, the Stockholder hereby agrees that for the
period commencing at the Effective Time and ending on the date which is 180 days
after the  expiration  of the  Period,  the  Stockholder  shall give  Cordiant 1
business day prior written  notice of any intended  Disposition of Parent Shares
to be made by the  Stockholder  and at the request of Cordiant  agrees to effect
such Disposition through brokers or other financial intermediaries designated by
Cordiant to maintain an orderly  trading market for the Parent Shares,  provided
that  such  financial   intermediary  agrees  to  effect  and  does  effect  the
Disposition in a reasonable period following such notice.

         5.  Representations and Warranties of the Stockholder.  The Stockholder
hereby represents and warrants to each of Cordiant and Sub as follows:

                  (a) Ownership of Shares.  The Stockholder is the record holder
of or Beneficially  Owns the Shares.  On the date hereof,  the Shares constitute
all of the shares of Common Stock owned of record or  Beneficially  Owned by the
Stockholder  (excluding  any Stock Options (as defined in the Merger  Agreement)
held by the  Stockholder).  The Stockholder has sole voting power and sole power
to issue instructions with respect to the matters set forth in Section 2 hereof,
sole power of  disposition,  sole power of  conversion,  sole power to  exercise
dissenters'  rights and sole power to agree to all of the  matters  set forth in
this  agreement,  in  each  case  with  respect  to all of the  Shares,  with no
limitations,   qualifications  or  restrictions  on  such  rights,   subject  to
applicable securities laws and the terms of this Agreement.

                  (b) Power;  Binding  Agreement.  The Stockholder has the legal
capacity,  power and authority to enter into and perform all of his  obligations
under this Agreement. The execution,  delivery and performance of this Agreement
by the Stockholder will not violate any other Agreement to which the Stockholder
is a party including,  without  limitation,  any voting agreement,  shareholders
agreement or voting trust. This Agreement has been duly and validly executed and
delivered by the Stockholder  and  constitutes a valid and binding  agreement of
the  Stockholder,  enforceable  against the  Stockholder in accordance  with its
terms  except  that  such  enforceability  (i)  may be  limited  by  bankruptcy,
insolvency,  moratorium  or other similar laws  relating to the  enforcement  of
creditors' rights generally and (ii) is subject to general  principles of equity
and  discretion  of the court before which any  proceedings  seeking  injunctive
relief or specific  performance may be sought. There is no beneficiary or holder
of a voting  trust  certificate  or other  interest  of any  trust of which  the
Stockholder  is trustee whose consent is required for the execution and delivery
of this agreement or the  consummation  by the  Stockholder of the  transactions
contemplated  hereby. If the Stockholder is married and the Stockholder's Shares
constitute community property, this agreement has been duly authorized, executed
and  delivered  by,  and  constitutes  a valid and  binding  agreement  of,  the
Stockholder's  spouse,  enforceable  against such Person in accordance  with its
terms  except  that  such  enforceability  (i)  may be  limited  by  bankruptcy,
insolvency,  moratorium  or other similar laws  relating to the  enforcement  of
creditors' rights generally and (ii) is subject to general  principles of equity
and  discretion  of the court before which any  proceedings  seeking  injunctive
relief or specific performance may be sought.

                  (c) No Conflicts. Except for filings, permits, authorizations,
consents and  approvals  under the HSR Act and the  Securities  Act of 1933,  if
applicable,  (A) no  filing  with,  and no  permit,  authorization,  consent  or
approval of, any state or federal  public body or authority is necessary for the
execution  of this  Agreement by the  Stockholder  and the  consummation  by the
Stockholder  of  the  transactions  contemplated  hereby  and  (B)  none  of the
execution and delivery of this Agreement by the Stockholder, the consummation by
the  Stockholder of the  transactions  contemplated  hereby or compliance by the
Stockholder with any of the provisions  hereof shall, in a manner which would be
material  and  adverse  to the  ability of the  Stockholder  to  consummate  the
transactions contemplated hereby or to comply with the terms hereof, result in a
violation or breach of, or constitute  (with or without  notice or lapse of time
or both) a  default  (or give  rise to any  third  party  right of  termination,
cancellation,  material  modification or  acceleration)  under any of the terms,
conditions  or  provisions  of any note,  bond,  mortgage,  indenture,  license,
contract, commitment, arrangement,  understanding, agreement or other instrument
or  obligation of any kind to which the  Stockholder  is a party or by which the
Stockholder or any of the  Stockholder's  properties or assets may be bound,  or
(3) violate any order, writ, injunction,  decree, judgment, order, statute, rule
or  regulation  applicable  to the  Stockholder  or  any  of  the  Stockholder's
properties or assets.

                  (d) No  Encumbrances.  Except as applicable in connection with
the  transactions  contemplated  hereby or as set forth on  Schedule  B attached
hereto, the Shares and the certificates  representing the Shares are now, and at
all times  during the term  hereof  will be,  held by the  Stockholder,  or by a
nominee or custodian for the benefit of the  Stockholder,  free and clear of all
liens,  claims,  security  interests,  proxies,  voting  trusts  or  agreements,
understandings or arrangements or any other encumbrances whatsoever,  except for
any such encumbrances or proxies arising hereunder in favor of Cordiant.

                  (e) No Finder's Fees. No broker,  investment banker, financial
adviser  or other  person  is  entitled  to any  broker's,  finder's,  financial
adviser's or other similar fee or commission in connection with the transactions
contemplated  hereby  based  upon  arrangements  made  by or on  behalf  of  the
Stockholder  other than Bear Stearns & Co. Inc.,  the fees and expenses of which
shall be paid by the Company.

                  (f) Reliance by Cordiant and Sub. The Stockholder  understands
and acknowledges that Cordiant and Sub are entering into the Merger Agreement in
reliance upon the Stockholder's execution and delivery of this Agreement.

         6.   Additional  Covenants of the Stockholder.  The Stockholder  hereby
covenants to each of Cordiant and Sub as follows:

                  (a) No  Solicitation.  Subject to the provisions  contained in
Section 10 of this  Agreement,  the  Stockholder  shall not, in his  capacity as
such,   directly  or  indirectly,   solicit  (including  by  way  of  furnishing
information)  or respond to any  inquiries  or the making of any proposal by any
Person or entity (other than Cordiant or any affiliate of Cordiant) with respect
to the Company that constitutes a Takeover Proposal. If the Stockholder receives
any such  inquiry  or  proposal,  then the  Stockholder  shall  promptly  inform
Cordiant of the existence  thereof.  The Stockholder will immediately  cease and
cause to be terminated any existing activities, discussions or negotiations with
any parties conducted heretofore with respect to any of the foregoing.

                  (b)  Restriction   on   Transfer   of   Shares,   Proxies  and
Non-Interference.  Beginning on the date hereof and ending on the later to occur
of (A) last date the Stock Options are exercisable  pursuant to Section 3 hereof
and (B) the date that all of the Stockholder's  obligations under Section 2 have
terminated, except as contemplated by this Agreement or the Merger Agreement, no
Stockholder shall,  directly or indirectly,  (i) offer for sale, sell, transfer,
tender,  pledge,  encumber,  assign or  otherwise  dispose of, or enter into any
contract,  option or other  arrangement  or  understanding  with  respect  to or
consent to the offer for sale,  sale,  transfer,  tender,  pledge,  encumbrance,
assignment  or other  disposition  of, any or all of the Shares or any  interest
therein;  (ii) except as contemplated  by this  Agreement,  grant any proxies or
powers of attorney,  deposit any of the Shares into a voting trust or enter into
a voting  agreement with respect to any of the Shares;  or (iii) take any action
that would make any  representation  or  warranty of the  Stockholder  contained
herein  untrue or incorrect or have the effect of  preventing  or disabling  the
Stockholder from performing the Stockholder's  obligations under this Agreement.
Notwithstanding   anything  to  the  contrary  provided  in  this  Agreement,  a
Stockholder  shall have the right to make  Permitted  Transfers  of Shares.  The
Stockholder agrees with, and covenants to, Sub that beginning on the date hereof
and  ending on the last date the  Stock  Options  are  exercisable  pursuant  to
Section 3 hereof,  the Stockholder  shall not request that the Company  register
the transfer  (book-entry  or otherwise) of any  certificate  or  uncertificated
interest  representing  any of the  Shares,  unless  such  transfer  is  made in
compliance with this Agreement (including the provisions of Section 2 hereof).

                  (c) Additional  Shares.  The  Stockholder  agrees,  while this
Agreement is in effect (i) to notify  Cordiant and Sub promptly of the number of
any shares of Common  Stock  acquired by the  Stockholder  after the date hereof
(the "Additional  Shares") and (ii) to vote such Additional Shares in accordance
with Section 2 hereof. Such Additional Shares shall also be subject to the Stock
Option granted to Sub pursuant to Section 3 hereof and the restriction contained
in Section 6(b)(i) and (ii) above.

         7.   Representations  and Warranties of Cordiant and Sub.  Cordiant and
Sub hereby  covenant,  represent  and  warrant to the  Stockholder  that each of
Cordiant and Sub has the legal  capacity,  power and authority to enter into and
perform all of such party's  obligations  under this  Agreement;  the execution,
delivery and  performance of this Agreement by Cordiant and Sub will not violate
or result in a breach of any other  material  agreement to which Cordiant or Sub
is a party; the execution and delivery of this Agreement and the consummation of
the transactions  contemplated hereby (i) have been duly authorized by the board
of  directors  of  Cordiant  and Sub,  and (ii) do not and will not  violate any
provision of the certificate of incorporation or by-laws of Cordiant or Sub; and
this  Agreement  has been duly and validly  executed  and  delivered  by each of
Cordiant and Sub and  constitutes  a valid and binding  agreement of such party,
enforceable against such party in accordance with its terms.

         8.  Further Assurances. From time to time, at the other party's request
and without further  consideration,  each party hereto shall execute and deliver
such additional reasonable documents and take all such further reasonable lawful
action as may be necessary or desirable to consummate and make effective, in the
most  expeditious  manner  practicable,  the  transactions  contemplated by this
Agreement.

         9.   Termination;  Expenses and Fee. (a) The covenants  and  agreements
contained herein with respect to the Shares shall terminate (i) in the event the
Merger  Agreement  is  terminated  in  accordance  with  its  terms,  upon  such
termination,  except that the  provisions of Sections 2, 3 and 6(b) hereof shall
survive any such  termination  solely in accordance with their terms and (ii) in
the event the Merger is  consummated,  at the  Effective  Time,  except that the
provisions of Section 4 hereof shall survive any such termination,  provided, in
each case, that the provisions of Section 12 and Section 13 hereof shall survive
any termination of this Agreement, and provided, further, that no termination of
this Agreement shall relieve any party of liability for a breach hereof.

         (b) Each  party shall bear its own expenses  in  connection  with  this
Agreement and the transactions contemplated hereby.

         10.  Stockholder  Capacity.  The  Stockholder  is  not  executing  this
Agreement and does not make any agreement or understanding  herein in his or her
capacity as a director or officer of the  Company and nothing  contained  herein
shall limit or affect any actions taken by the  Stockholder in his capacity as a
director or officer of the Company to the extent such action is permitted by, or
not  prohibited  by,  the  Merger  Agreement,  and none of such  actions in such
capacities  shall be  deemed  to  constitute  a breach  of this  Agreement.  The
Stockholder  signs solely in his capacity as the record and beneficial owner of,
or the trustee of a trust whose  beneficiaries are the beneficial owners of, the
Shares.

         11. Sophistication. The Stockholder acknowledges that he is an informed
and sophisticated  investor and, together with his advisors, has undertaken such
investigation as they have deemed necessary,  including the review of the Merger
Agreement and this Agreement,  to enable the Stockholder to make an informed and
intelligent decision with respect to the Merger Agreement and this Agreement and
the transactions contemplated thereby and hereby.

         12.  Confidentiality.  Each  of  the  parties  hereto  recognizes  that
successful  consummation of the transactions  contemplated by this Agreement may
be  dependent  upon  confidentiality  with  respect to the  matters  referred to
herein. In this connection, pending public disclosure thereof, each party hereby
agrees not to disclose or discuss  such  matters with anyone not a party to this
Agreement or the Merger Agreement (other than such party's counsel and advisors,
if any) without the prior written consent of the other party, except for filings
required  pursuant to the Exchange Act and the rules and regulations  thereunder
or disclosures  such party's  counsel  advises are necessary in order to fulfill
such  party's  obligations  imposed by law, in which event such party shall give
notice of such disclosure to the other party as promptly as practicable so as to
enable the other  party to seek a  protective  order  from a court of  competent
jurisdiction with respect thereto.

         13.  Miscellaneous.

                  (a) Entire Agreement.  This Agreement and the Merger Agreement
constitute the entire agreement  between the parties with respect to the subject
matter hereof and supersede all other prior agreements and understandings,  both
written and oral, between the parties with respect to the subject matter hereof.

                  (b) Certain Events. The Stockholder agrees that this Agreement
and the obligations hereunder shall attach to the Stockholder's Shares and shall
be binding upon any person or entity to which legal or  beneficial  ownership of
such Shares shall pass,  whether by operation  of law or  otherwise,  including,
without  limitation,  the  Stockholder's  heirs,  guardians,  administrators  or
successors,  provided,  that following the Effective  Time, this Agreement shall
not be binding on any  purchaser of Shares in a  transaction  made in compliance
with Section 4(b), other than Permitted Transfers.  Notwithstanding any transfer
of  Shares,  the  transferor  shall  remain  liable for the  performance  of all
obligations under this Agreement of the transferor.

                  (c) Change in Control.  In the event that after the  Effective
Time (i) any Person or group of Persons  acting in  concert  (as  defined in the
City Code on Take-overs and Mergers in the United Kingdom)  acquires an interest
in the equity share capital of Cordiant (an "Acquiring Person") and, immediately
following such  acquisition,  such person,  or group,  holds shares  entitled to
exercise  more than 50% of the votes  which may be cast at a general  meeting of
Cordiant or (ii) a majority of the board of  directors  of Cordiant  immediately
prior  to  such  Person  becoming  an  Acquiring  Person,  cease  to  thereafter
constitute a majority of the board of directors of Cordiant  (other than through
elections of directors  whose  nomination  for election by the  shareholders  of
Cordiant  were  approved by the vote of a majority of  directors of Cordiant who
were either  directors prior to a Person  becoming an Acquiring  Person or whose
election or  nomination  for  election  was so  previously  approved),  then the
restrictions on Dispositions contained in Section 4, shall terminate without any
action on the part of any party hereto.

                  (d)  Assignment.  This  Agreement  shall  not be  assigned  by
operation of law or  otherwise  without the prior  written  consent of the other
party,  provided,  that Cordiant or Sub may assign, in its sole discretion,  its
rights  and  obligations  hereunder  to any  direct  or  indirect  wholly  owned
subsidiary of Cordiant,  but no such assignment shall relieve Cordiant or Sub of
its  obligations  hereunder  if such  assignee  does not or cannot  perform such
obligations.

                  (e)  Amendments,  Waivers,  Etc.  This  Agreement  may  not be
amended,  changed,  supplemented,  waived or otherwise  modified or  terminated,
except upon the  execution and delivery of a written  agreement  executed by the
party to be charged  thereby  or,  with  respect to  termination,  as  otherwise
provided herein.

                  (f) Notices. All notices,  requests, claims, demands and other
communications  hereunder  shall be in writing  and shall be given (and shall be
deemed to have been duly received if so given) by hand delivery, telegram, telex
or telecopy,  or by mail (registered or certified mail, postage prepaid,  return
receipt requested) or by any courier service, such as Federal Express, providing
proof of  delivery.  All  communications  hereunder  shall be  delivered  to the
respective parties at the following addresses:

         If to the Stockholder:     Francis Hughes
                                    c/o Healthworld Corporation
                                    100 Avenue of the Americas
                                    New York, New York 10010
                                    Facsimile: (212) 966-2743

         and

         If to Cordiant or
         Sub to:                    Cordiant Communications Group plc
                                    121-141 Westbourne Terrace
                                    London, W2 6JR
                                    Attention:  Deputy Finance Director
                                    Facsimile: 011-44-171-262-4300

         copy to:                   White & Case LLP
                                    1155 Avenue of the Americas
                                    New York, New York  10036-2787
                                    Attention:  Timothy B. Goodell, Esq.
                                    Facsimile:  (212) 354-8113

or to such  other  address  as the  person  to whom  notice  is  given  may have
previously furnished to the others in writing in the manner set forth above.

                  (g) Severability. Whenever possible, each provision or portion
of any provision of this  Agreement  will be interpreted in such manner as to be
effective and valid under  applicable law but if any provision or portion of any
provision of this Agreement is held to be invalid,  illegal or  unenforceable in
any  respect  under  any  applicable  law  or  rule  in any  jurisdiction,  such
invalidity,  illegality or unenforceability  will not affect any other provision
or portion of any provision in such  jurisdiction,  and this  Agreement  will be
reformed,  construed  and  enforced  in such  jurisdiction  as if such  invalid,
illegal or  unenforceable  provision or portion of any  provision had never been
contained herein.

                  (h)  Specific   Performance.   Each  of  the  parties   hereto
recognizes and  acknowledges  that a breach by it of any covenants or agreements
contained in this  Agreement will cause the aggrieved  party to sustain  damages
for which it would not have an  adequate  remedy at law for money  damages,  and
therefore each of the parties hereto agrees that in the event of any such breach
the aggrieved  party shall be entitled to the remedy of specific  performance of
such  covenants and agreements  and  injunctive  and other  equitable  relief in
addition to any other remedy to which it may be entitled, at law or in equity.

                  (i)  Remedies  Cumulative.  All  rights,  powers and  remedies
provided under this Agreement or otherwise available in respect hereof at law or
in equity  shall be  cumulative  and not  alternative,  and the  exercise of any
thereof by any party shall not preclude the  simultaneous  or later  exercise of
any other such right, power or remedy by such party.

                  (j) No Waiver. The failure of any party hereto to exercise any
right,  power or remedy provided under this Agreement or otherwise  available in
respect  hereof at law or in equity,  or to insist upon  compliance by any other
party hereto with its obligations  hereunder,  and any custom or practice of the
parties at variance with the terms hereof, shall not constitute a waiver by such
party of its right to exercise  any such or other  right,  power or remedy or to
demand such compliance.

                  (k)  No  Third  Party  Beneficiaries.  This  Agreement  is not
intended to be for the benefit of, and shall not be  enforceable  by, any person
or entity who or which is not a party hereto.

                  (l)  Governing  Law.  This  Agreement  shall be  governed  and
construed in accordance  with the laws of the State of New York,  without giving
effect to the principles of conflicts of law thereof.

                  (m) Jurisdiction. Each party hereby irrevocably submits to the
exclusive  jurisdiction of the Court of Chancery in the State of Delaware or the
United States District Court for the Southern  District of New York or any court
of the State of New York located in the City of New York in any action,  suit or
proceeding  arising in connection with this Agreement,  and agrees that any such
action,  suit or proceeding  shall be brought only in such court (and waives any
objection  based  on  forum  non  conveniens  or any  other  objection  to venue
therein); provided, however, that such consent to jurisdiction is solely for the
purpose  referred  to in this  paragraph  (1) and  shall  not be  deemed to be a
general  submission  to the  jurisdiction  of said  Courts  or in the  States of
Delaware  or New York other than for such  purposes.  Each party  hereto  hereby
waives any right to a trial by jury in connection with any such action,  suit or
proceeding.

                  (n) Descriptive Headings. The descriptive headings used herein
are inserted for  convenience  of reference only and are not intended to be part
of or to affect the meaning or interpretation of this Agreement.

                  (o)   Counterparts.   This   Agreement   may  be  executed  in
counterparts, each of which shall be deemed to be an original, but all of which,
taken together, shall constitute one and the same Agreement.


                        [SIGNATURES BEGIN ON NEXT PAGE]

<PAGE>


         IN WITNESS WHEREOF,  Cordiant, Sub and the Stockholder have caused this
Agreement to be duly executed as of the day and year first above written.


                                        CORDIANT COMMUNICATIONS GROUP PLC


                                        By: /s/ Arthur D'Angelo
                                            -----------------------------
                                            Name:  Arthur D'Angelo
                                            Title: Finance Director



                                        HEALTHWORLD ACQUISITION CORP.


                                        By: /s/ Arthur D'Angelo
                                            -----------------------------
                                            Name:  Arthur D'Angelo
                                            Title: President



                                        /s/ Francis Hughes
                                        ---------------------------------
                                        Francis Hughes




<PAGE>



              Schedule B to Stockholder Agreement of Francis Hughes



No exceptions.





                                                                       EXHIBIT 8


                              STOCKHOLDER AGREEMENT


         AGREEMENT dated November 9, 1999, among Cordiant  Communications  Group
plc,  a company  organized  under the laws of  England  and Wales  ("Cordiant"),
Healthworld Acquisition Corporation,  a Delaware corporation and a direct wholly
owned   subsidiary  of  Cordiant   ("Sub"),   and  William  Leslie  Milton  (the
"Stockholder").

                              W I T N E S S E T H:

         WHEREAS,   concurrently  herewith,   Cordiant,   Sub,  and  Healthworld
Corporation,  a Delaware  corporation  (the  "Company"),  are  entering  into an
Agreement  and Plan of Merger (as such  agreement  may hereafter be amended from
time to time, the "Merger Agreement"), pursuant to which Sub will be merged with
and into the Company and the Company shall continue as the surviving corporation
(the "Merger");

         Whereas,  the  Stockholder  Beneficially  Owns,  as of the date hereof,
1,305,984  shares (the "Shares") of common stock,  $.01 par value per share,  of
the Company (the "Common Stock"); and

         WHEREAS,  as an inducement  and a condition to entering into the Merger
Agreement,  Cordiant and Sub have required that the Stockholder  agree,  and the
Stockholder has agreed, to enter into this Agreement;

         NOW,  THEREFORE,  in  consideration  of the  foregoing  and the  mutual
premises,  representations,   warranties,  covenants  and  agreements  contained
herein,  the parties  hereto,  intending  to be legally  bound,  hereby agree as
follows:

         1. Definitions. Unless other defined herein, all capitalized terms used
herein shall have the meanings given to such terms in the Merger Agreement.  For
purposes of this Agreement:

                  (a) "Beneficially Own" or "Beneficial  Ownership" with respect
to any securities  shall mean having  "beneficial  ownership" of such securities
(as determined pursuant to Rule 13d-3 under the Securities Exchange Act of 1934,
as  amended  (the  "Exchange  Act")),   including  pursuant  to  any  agreement,
arrangement or understanding, whether or not in writing.

         Without duplicative counting of the same securities by the same holder,
securities  Beneficially Owned by a Person shall include securities Beneficially
Owned by all other  Persons with whom such Person would  constitute a "group" as
within the meanings of Section 13(d)(3) of the Exchange Act.

                  (b) "Exchange Rate" means the average  currency  exchange rate
of pounds  sterling to US dollars based upon the noon buying rate in the City of
New York for cable  transfers in foreign  currencies as announced by the Federal
Reserve Bank of New York for customs  purposes over the 10  consecutive  Trading
Days  ending on the day on which the Stock  Options  are  exercised  pursuant to
Section 3.

                  (c)  "Parent  Share  Value"  shall mean the product of (x) the
average of the closing  middle market  quotation of a Parent Share on the LSE as
reported in the Daily Official List of the London Stock Exchange for each of the
ten  consecutive  Trading Days ending on the day on which the Stock  Options are
exercised pursuant to Section 3 multiplied by (y) Exchange Rate.

                  (d) "Parent  Shares"  shall mean the ordinary  shares,  with a
nominal  value  of U.K.  fifty  pence  each  ("Ordinary  Shares"),  of  Cordiant
(including  any  options or other  rights to receive  Ordinary  Shares)  and the
American Depositary Shares, each representing the right to receive five Ordinary
Shares ("ADSs").

                  (e)   "Person"   shall   mean  an   individual,   corporation,
partnership,  limited  liability  company,  joint venture,  association,  trust,
unincorporated organization or other entity.

                  (f) "Share Value" shall be determined as follows:

                  (i)   if the Parent Share  Value is equal to or  greater  than
         $2.5054  and equal to or less than  $3.4838,  the Share  Value shall be
         $20.00;

                  (ii)   if the Parent Share Value is greater  than $3.4838, the
         Share Value  shall be  $23.00; and

                  (iii)  if the  Parent  Share  Value is  less than $2.5054, the
         Share Value shall be $17.00.

                  (g) "Trading Day" shall mean any day on which  securities  are
traded,  with  respect to ADSs,  on the New York Stock  Exchange,  Inc. and with
respect to Ordinary Shares, on the London Stock Exchange Limited.

         2.    Provisions  Concerning  Common Stock. (a) The Stockholder  hereby
agrees that during the period  described in clause (b) below,  at any meeting of
the holders of Common Stock of the Company,  however  called,  or in  connection
with any written  consent of the  holders of Common  Stock of the  Company,  the
Stockholder  shall vote (or cause to be voted) the Shares of Common Stock of the
Company,  (i) in favor of the Merger,  the execution and delivery by the Company
of the Merger  Agreement  and the approval of the terms  thereof and each of the
other actions  contemplated  by the Merger  Agreement and this Agreement and any
actions required in furtherance  thereof and hereof;  (ii) against any action or
agreement that would result in a breach in any material respect of any covenant,
representation  or warranty or any other  obligation or agreement of the Company
under the Merger  Agreement  or this  Agreement;  and (iii)  except as otherwise
agreed to in writing  in advance by  Cordiant,  against  the  following  actions
(other  than  the  Merger  and  the  transactions  contemplated  by  the  Merger
Agreement):  (A) any  extraordinary  corporate  transaction,  such as a  merger,
consolidation  or  other  business  combination  involving  the  Company  or its
Subsidiaries;  (B) a sale,  lease or transfer of a material  amount of assets of
the  Company  or  its  Subsidiaries,  or  a  reorganization,   recapitalization,
dissolution or liquidation of the Company or its Subsidiaries; (C) any change in
a majority of the persons who  constitute the board of directors of the Company;
(D) any change in the present  capitalization of the Company or any amendment of
the Company's  Certificate of  Incorporation  or Bylaws;  (E) any other material
change in the Company's corporate structure or business; or (F) any other action
involving the Company or its Subsidiaries which is intended, or could reasonably
be  expected,  to  materially  impede,   interfere  with,  delay,  postpone,  or
materially adversely affect the Merger and the transactions contemplated by this
Agreement and the Merger  Agreement.  The  Stockholder  shall not enter into any
agreement  or  understanding  with any  Person  the  effect  of  which  would be
inconsistent  with or violative of the provisions  and  agreements  contained in
this Section 2.

         (b) The  obligations  of the  Stockholders  under clauses (i), (ii) and
(iii)(C),  (D), (E) and (F) of this Section 2 shall  terminate on the earlier to
occur of the  Effective  Time and the  termination  of the Merger  Agreement  in
accordance  with its terms.  The  obligations  of the  Stockholder  under clause
(iii)(A)  and (B) of this  Section 2 shall  terminate on the earlier to occur of
the Effective Time and 120 days after the termination of the Merger Agreement in
accordance  with its terms (unless the Merger  Agreement is terminated by reason
of the  failure  to  obtain  Parent  Shareholders'  Approval  in which  case the
Stockholder's  obligations  under this Section 2 shall terminate  simultaneously
with the termination of the Merger Agreement).

         3.  Option  to  Purchase.  In order to induce Cordiant and Sub to enter
into the Merger Agreement,  the Stockholder  hereby grants to Sub an irrevocable
option (the "Stock  Options")  to  purchase,  all, and not less than all, of the
Shares at a purchase  price per share equal to the Share Value,  payable in cash
(the  "Purchase  Price"),  solely upon, and subject to, the terms and conditions
set forth below.  The Stock Options may only be exercised if Sub  simultaneously
exercises  all other  options held by it to purchase all, and not less than all,
of the shares of Common Stock covered by such  options.  The Stock Options shall
become  exercisable  solely in the event that the Merger Agreement is terminated
pursuant  to (i)  Section  9.1(b)(ii)  thereof,  but only if the  basis for such
termination  is the failure to obtain the Company  Stockholder  Approval or (ii)
Section  9.1(b)(iii)  thereof,  but only if the basis for such  termination is a
breach by the Company,  or the  Stockholder  materially  breaches any  agreement
contained in this Agreement, in which event the Stock Options shall, in any such
case, become immediately exercisable at any time and from time to time upon such
termination or upon Cordiant and Sub being informed of such breach,  as the case
may be, and until the date  which is 20 days after the date of such  termination
or the date on which  Cordiant and Sub are informed of such breach,  as the case
may be,  provided,  that if at the  expiration  of such 20-day  period the Stock
Options cannot be exercised by reason of any preliminary or final  injunction or
other order issued by any court or  governmental,  administrative  or regulatory
agency or authority  prohibiting  the exercise of the Stock Options  pursuant to
this  Agreement,  or because all  waiting  periods  under the  Hart-Scott-Rodino
Antitrust Improvements Act of 1976, as amended (the "HSR ACT"), required for the
purchase of the Shares upon such exercise shall not have expired or been waived,
the Stock Options shall be exercisable until 10 business days after the later of
the date on which such  impediment to exercise  shall have been removed or shall
have become final and not subject to appeal.  In all other instances,  the Stock
Options shall  terminate upon the  termination of the Merger  Agreement.  In the
event that Cordiant wishes to exercise the Stock Options,  Cordiant shall send a
written notice (the "Notice") to the  Stockholder  identifying  the place (which
shall be in New York City for each  Stockholder  who is a resident of the United
States  and in London  for each  Stockholder  who is a  resident  of the  United
Kingdom) and date (not less than two business days nor greater than ten business
days from the date of the  Notice)  for the  closing of such  purchase.  At such
closing,  Cordiant shall receive  certificates for the Shares, duly endorsed for
transfer,  and shall make  payment  therefor  by wire  transfer  of  immediately
available funds.

         4.  Disposition of Parent Shares.

                  (a)  Restrictions  on  Disposition.   The  Stockholder  hereby
agrees,  except as permitted in this Section 4(a) and Section 4(b) below, not to
directly or indirectly, offer to sell, contract to sell, transfer, assign, cause
to be  redeemed  or  otherwise  sell  or  dispose  of any of the  Parent  Shares
(collectively  a  "Disposition")  received by the stockholder in connection with
the  Merger  without  the prior  written  consent of  Cordiant.  Notwithstanding
anything to the contrary provided in this Agreement,  the Stockholder shall have
the right to  transfer  Parent  Shares  (i) to any  Family  Member,  (ii) to the
trustee or trustees of a trust solely (except for remote  contingent  interests)
for the benefit of the  Stockholder  and/or one or more Family  Members and/or a
charitable organization (a "Family Member Trust"), (iii) to a foundation created
or established by the Stockholder, or any other charitable organization, (iv) to
a  corporation  of which the  Stockholder  and/or any Family  Member  and/or any
Family Member Trust owns all of the outstanding  capital stock, (v) to a limited
liability  company of which the Stockholder  and/or any Family Member and/or any
Family Member Trust owns all of the outstanding membership interests,  (vi) to a
partnership of which the Stockholder  and/or any Family Member and/or any Family
Member  Trust  owns all of the  partnership  interests,  (vii) to the  executor,
administrator or personal representative of the estate of the Stockholder or any
other Family Member, or (viii) to any guardian, trustee or conservator appointed
with respect to the assets of the Stockholder, provided, that in the case of any
such  transfer,  the  transferee  shall  execute an agreement to be bound by the
terms of this  Agreement  (each  such  transfer,  a  "Permitted  Transfer"  and,
collectively,  the  "Permitted  Transfers").  For  purposes  of this  Agreement,
"Family  Member"  shall mean (a) the  Stockholder's  spouse,  if living with the
Stockholder,  (b) any one of the following:  the Stockholder's  father,  mother,
issue,  brother  or sister,  and the issue of a brother  or sister,  and (c) the
spouse of any  Family  Member  described  in (b) above,  if the spouse  shall be
living with that Family Member.  The  Stockholder  hereby agrees and consents to
the entry of stop transfer  instructions with Cordiant's  transfer agent against
the transfer of such Parent  Shares except in  compliance  with this  Agreement.
Notwithstanding  the  foregoing,  the  Stockholder  may pledge,  hypothecate  or
otherwise  grant a security  interest  in all or a portion of the Parent  Shares
beneficially owned by him during the term of this Agreement;  provided, however,
that any Person  receiving  such  Parent  Shares  shall be subject to all of the
restrictions  on  Disposition of such Parent Shares imposed by this Agreement to
the same extent as the Stockholder.

                  (b) Permitted Dispositions. The Stockholder may not effect any
Disposition of Parent Shares  received by the Stockholder in connection with the
Merger except as follows:  during the six-month period immediately following the
Effective Time the  Stockholder  may effect the Disposition of not more than 30%
of the Parent Shares Beneficially Owned by the Stockholder (the "Period").  Upon
the expiration of the Period, the Stockholder may effect the Dispositions of all
or any  portion of the Parent  Shares  Beneficially  Owned by him subject to any
applicable  restrictions  under the Federal  Securities Law and  restrictions of
general  application  under  English law, the Listing  Rules of the London Stock
Exchange,  if applicable,  and  Cordiant's  policies made pursuant to such rules
regarding  dealings in Parent  Shares by  directors  and  relevant  employees of
Cordiant and its subsidiaries,  if applicable.  Notwithstanding  anything to the
contrary contained in this Section 4, the Stockholder hereby agrees that for the
period commencing at the Effective Time and ending on the date which is 180 days
after the  expiration  of the  Period,  the  Stockholder  shall give  Cordiant 1
business day prior written  notice of any intended  Disposition of Parent Shares
to be made by the  Stockholder  and at the request of Cordiant  agrees to effect
such Disposition through brokers or other financial intermediaries designated by
Cordiant to maintain an orderly  trading market for the Parent Shares,  provided
that  such  financial   intermediary  agrees  to  effect  and  does  effect  the
Disposition in a reasonable period following such notice.

         5.   Representations and Warranties of the Stockholder. The Stockholder
hereby represents and warrants to each of Cordiant and Sub as follows:

                  (a) Ownership of Shares.  The Stockholder is the record holder
of or Beneficially  Owns the Shares.  On the date hereof,  the Shares constitute
all of the shares of Common Stock owned of record or  Beneficially  Owned by the
Stockholder  (excluding  any Stock Options (as defined in the Merger  Agreement)
held by the  Stockholder).  The Stockholder has sole voting power and sole power
to issue instructions with respect to the matters set forth in Section 2 hereof,
sole power of  disposition,  sole power of  conversion,  sole power to  exercise
dissenters'  rights and sole power to agree to all of the  matters  set forth in
this  agreement,  in  each  case  with  respect  to all of the  Shares,  with no
limitations,   qualifications  or  restrictions  on  such  rights,   subject  to
applicable securities laws and the terms of this Agreement.

                  (b) Power;  Binding  Agreement.  The Stockholder has the legal
capacity,  power and authority to enter into and perform all of his  obligations
under this Agreement. The execution,  delivery and performance of this Agreement
by the Stockholder will not violate any other Agreement to which the Stockholder
is a party including,  without  limitation,  any voting agreement,  shareholders
agreement or voting trust. This Agreement has been duly and validly executed and
delivered by the Stockholder  and  constitutes a valid and binding  agreement of
the  Stockholder,  enforceable  against the  Stockholder in accordance  with its
terms  except  that  such  enforceability  (i)  may be  limited  by  bankruptcy,
insolvency,  moratorium  or other similar laws  relating to the  enforcement  of
creditors' rights generally and (ii) is subject to general  principles of equity
and  discretion  of the court before which any  proceedings  seeking  injunctive
relief or specific  performance may be sought. There is no beneficiary or holder
of a voting  trust  certificate  or other  interest  of any  trust of which  the
Stockholder  is trustee whose consent is required for the execution and delivery
of this agreement or the  consummation  by the  Stockholder of the  transactions
contemplated  hereby. If the Stockholder is married and the Stockholder's Shares
constitute community property, this agreement has been duly authorized, executed
and  delivered  by,  and  constitutes  a valid and  binding  agreement  of,  the
Stockholder's  spouse,  enforceable  against such Person in accordance  with its
terms  except  that  such  enforceability  (i)  may be  limited  by  bankruptcy,
insolvency,  moratorium  or other similar laws  relating to the  enforcement  of
creditors' rights generally and (ii) is subject to general  principles of equity
and  discretion  of the court before which any  proceedings  seeking  injunctive
relief or specific performance may be sought.

                  (c) No Conflicts. Except for filings, permits, authorizations,
consents and  approvals  under the HSR Act and the  Securities  Act of 1933,  if
applicable,  (A) no  filing  with,  and no  permit,  authorization,  consent  or
approval of, any state or federal  public body or authority is necessary for the
execution  of this  Agreement by the  Stockholder  and the  consummation  by the
Stockholder  of  the  transactions  contemplated  hereby  and  (B)  none  of the
execution and delivery of this Agreement by the Stockholder, the consummation by
the  Stockholder of the  transactions  contemplated  hereby or compliance by the
Stockholder with any of the provisions  hereof shall, in a manner which would be
material  and  adverse  to the  ability of the  Stockholder  to  consummate  the
transactions contemplated hereby or to comply with the terms hereof, result in a
violation or breach of, or constitute  (with or without  notice or lapse of time
or both) a  default  (or give  rise to any  third  party  right of  termination,
cancellation,  material  modification or  acceleration)  under any of the terms,
conditions  or  provisions  of any note,  bond,  mortgage,  indenture,  license,
contract, commitment, arrangement,  understanding, agreement or other instrument
or  obligation of any kind to which the  Stockholder  is a party or by which the
Stockholder or any of the  Stockholder's  properties or assets may be bound,  or
(3) violate any order, writ, injunction,  decree, judgment, order, statute, rule
or  regulation  applicable  to the  Stockholder  or  any  of  the  Stockholder's
properties or assets.

                  (d) No  Encumbrances.  Except as applicable in connection with
the  transactions  contemplated  hereby or as set forth on  Schedule  B attached
hereto, the Shares and the certificates  representing the Shares are now, and at
all times  during the term  hereof  will be,  held by the  Stockholder,  or by a
nominee or custodian for the benefit of the  Stockholder,  free and clear of all
liens,  claims,  security  interests,  proxies,  voting  trusts  or  agreements,
understandings or arrangements or any other encumbrances whatsoever,  except for
any such encumbrances or proxies arising hereunder in favor of Cordiant.

                  (e) No Finder's Fees. No broker,  investment banker, financial
adviser  or other  person  is  entitled  to any  broker's,  finder's,  financial
adviser's or other similar fee or commission in connection with the transactions
contemplated  hereby  based  upon  arrangements  made  by or on  behalf  of  the
Stockholder  other than Bear Stearns & Co. Inc.,  the fees and expenses of which
shall be paid by the Company.

                  (f) Reliance by Cordiant and Sub. The Stockholder  understands
and acknowledges that Cordiant and Sub are entering into the Merger Agreement in
reliance upon the Stockholder's execution and delivery of this Agreement.

         6.    Additional  Covenants of the Stockholder.  The Stockholder hereby
covenants to each of Cordiant and Sub as follows:

                  (a) No  Solicitation.  Subject to the provisions  contained in
Section 10 of this  Agreement,  the  Stockholder  shall not, in his  capacity as
such,   directly  or  indirectly,   solicit  (including  by  way  of  furnishing
information)  or respond to any  inquiries  or the making of any proposal by any
Person or entity (other than Cordiant or any affiliate of Cordiant) with respect
to the Company that constitutes a Takeover Proposal. If the Stockholder receives
any such  inquiry  or  proposal,  then the  Stockholder  shall  promptly  inform
Cordiant of the existence  thereof.  The Stockholder will immediately  cease and
cause to be terminated any existing activities, discussions or negotiations with
any parties conducted heretofore with respect to any of the foregoing.

                  (b)   Restriction   on   Transfer   of  Shares,   Proxies  and
Non-Interference.  Beginning on the date hereof and ending on the later to occur
of (A) last date the Stock Options are exercisable  pursuant to Section 3 hereof
and (B) the date that all of the Stockholder's  obligations under Section 2 have
terminated, except as contemplated by this Agreement or the Merger Agreement, no
Stockholder shall,  directly or indirectly,  (i) offer for sale, sell, transfer,
tender,  pledge,  encumber,  assign or  otherwise  dispose of, or enter into any
contract,  option or other  arrangement  or  understanding  with  respect  to or
consent to the offer for sale,  sale,  transfer,  tender,  pledge,  encumbrance,
assignment  or other  disposition  of, any or all of the Shares or any  interest
therein;  (ii) except as contemplated  by this  Agreement,  grant any proxies or
powers of attorney,  deposit any of the Shares into a voting trust or enter into
a voting  agreement with respect to any of the Shares;  or (iii) take any action
that would make any  representation  or  warranty of the  Stockholder  contained
herein  untrue or incorrect or have the effect of  preventing  or disabling  the
Stockholder from performing the Stockholder's  obligations under this Agreement.
Notwithstanding   anything  to  the  contrary  provided  in  this  Agreement,  a
Stockholder  shall have the right to make  Permitted  Transfers  of Shares.  The
Stockholder agrees with, and covenants to, Sub that beginning on the date hereof
and  ending on the last date the  Stock  Options  are  exercisable  pursuant  to
Section 3 hereof,  the Stockholder  shall not request that the Company  register
the transfer  (book-entry  or otherwise) of any  certificate  or  uncertificated
interest  representing  any of the  Shares,  unless  such  transfer  is  made in
compliance with this Agreement (including the provisions of Section 2 hereof).

                  (c) Additional  Shares.  The  Stockholder  agrees,  while this
Agreement is in effect (i) to notify  Cordiant and Sub promptly of the number of
any shares of Common  Stock  acquired by the  Stockholder  after the date hereof
(the "Additional  Shares") and (ii) to vote such Additional Shares in accordance
with Section 2 hereof. Such Additional Shares shall also be subject to the Stock
Option granted to Sub pursuant to Section 3 hereof and the restriction contained
in Section 6(b)(i) and (ii) above.

         7.    Representations  and Warranties of Cordiant and Sub. Cordiant and
Sub hereby  covenant,  represent  and  warrant to the  Stockholder  that each of
Cordiant and Sub has the legal  capacity,  power and authority to enter into and
perform all of such party's  obligations  under this  Agreement;  the execution,
delivery and  performance of this Agreement by Cordiant and Sub will not violate
or result in a breach of any other  material  agreement to which Cordiant or Sub
is a party; the execution and delivery of this Agreement and the consummation of
the transactions  contemplated hereby (i) have been duly authorized by the board
of  directors  of  Cordiant  and Sub,  and (ii) do not and will not  violate any
provision of the certificate of incorporation or by-laws of Cordiant or Sub; and
this  Agreement  has been duly and validly  executed  and  delivered  by each of
Cordiant and Sub and  constitutes  a valid and binding  agreement of such party,
enforceable against such party in accordance with its terms.

         8.    Further  Assurances.  From  time to time,  at the  other  party's
request and without further  consideration,  each party hereto shall execute and
deliver  such  additional   reasonable  documents  and  take  all  such  further
reasonable lawful action as may be necessary or desirable to consummate and make
effective,  in  the  most  expeditious  manner  practicable,   the  transactions
contemplated by this Agreement.

         9.    Termination;  Expenses and Fee. (a) The covenants and  agreements
contained herein with respect to the Shares shall terminate (i) in the event the
Merger  Agreement  is  terminated  in  accordance  with  its  terms,  upon  such
termination,  except that the  provisions of Sections 2, 3 and 6(b) hereof shall
survive any such  termination  solely in accordance with their terms and (ii) in
the event the Merger is  consummated,  at the  Effective  Time,  except that the
provisions of Section 4 hereof shall survive any such termination,  provided, in
each case, that the provisions of Section 12 and Section 13 hereof shall survive
any termination of this Agreement, and provided, further, that no termination of
this Agreement shall relieve any party of liability for a breach hereof.

         (b) Each party shall bear its own  expenses  in  connection  with  this
Agreement and the transactions contemplated hereby.

         10.   Stockholder  Capacity.  The  Stockholder  is not  executing  this
Agreement and does not make any agreement or understanding  herein in his or her
capacity as a director or officer of the  Company and nothing  contained  herein
shall limit or affect any actions taken by the  Stockholder in his capacity as a
director or officer of the Company to the extent such action is permitted by, or
not  prohibited  by,  the  Merger  Agreement,  and none of such  actions in such
capacities  shall be  deemed  to  constitute  a breach  of this  Agreement.  The
Stockholder  signs solely in his capacity as the record and beneficial owner of,
or the trustee of a trust whose  beneficiaries are the beneficial owners of, the
Shares.

         11.   Sophistication.  The  Stockholder  acknowledges  that  he  is  an
informed  and  sophisticated  investor  and,  together  with his  advisors,  has
undertaken  such  investigation  as they have deemed  necessary,  including  the
review of the Merger Agreement and this Agreement,  to enable the Stockholder to
make an informed and intelligent  decision with respect to the Merger  Agreement
and this Agreement and the transactions contemplated thereby and hereby.

         12.   Confidentiality.  Each  of the  parties  hereto  recognizes  that
successful  consummation of the transactions  contemplated by this Agreement may
be  dependent  upon  confidentiality  with  respect to the  matters  referred to
herein. In this connection, pending public disclosure thereof, each party hereby
agrees not to disclose or discuss  such  matters with anyone not a party to this
Agreement or the Merger Agreement (other than such party's counsel and advisors,
if any) without the prior written consent of the other party, except for filings
required  pursuant to the Exchange Act and the rules and regulations  thereunder
or disclosures  such party's  counsel  advises are necessary in order to fulfill
such  party's  obligations  imposed by law, in which event such party shall give
notice of such disclosure to the other party as promptly as practicable so as to
enable the other  party to seek a  protective  order  from a court of  competent
jurisdiction with respect thereto.

          13.  Miscellaneous.

                  (a) Entire Agreement.  This Agreement and the Merger Agreement
constitute the entire agreement  between the parties with respect to the subject
matter hereof and supersede all other prior agreements and understandings,  both
written and oral, between the parties with respect to the subject matter hereof.

                  (b) Certain Events. The Stockholder agrees that this Agreement
and the obligations hereunder shall attach to the Stockholder's Shares and shall
be binding upon any person or entity to which legal or  beneficial  ownership of
such Shares shall pass,  whether by operation  of law or  otherwise,  including,
without  limitation,  the  Stockholder's  heirs,  guardians,  administrators  or
successors,  provided,  that following the Effective  Time, this Agreement shall
not be binding on any  purchaser of Shares in a  transaction  made in compliance
with Section 4(b), other than Permitted Transfers.  Notwithstanding any transfer
of  Shares,  the  transferor  shall  remain  liable for the  performance  of all
obligations under this Agreement of the transferor.

                  (c) Change in Control.  In the event that after the  Effective
Time (i) any Person or group of Persons  acting in  concert  (as  defined in the
City Code on Take-overs and Mergers in the United Kingdom)  acquires an interest
in the equity share capital of Cordiant (an "Acquiring Person") and, immediately
following such  acquisition,  such person,  or group,  holds shares  entitled to
exercise  more than 50% of the votes  which may be cast at a general  meeting of
Cordiant or (ii) a majority of the board of  directors  of Cordiant  immediately
prior  to  such  Person  becoming  an  Acquiring  Person,  cease  to  thereafter
constitute a majority of the board of directors of Cordiant  (other than through
elections of directors  whose  nomination  for election by the  shareholders  of
Cordiant  were  approved by the vote of a majority of  directors of Cordiant who
were either  directors prior to a Person  becoming an Acquiring  Person or whose
election or  nomination  for  election  was so  previously  approved),  then the
restrictions on Dispositions contained in Section 4, shall terminate without any
action on the part of any party hereto.

                  (d)  Assignment.  This  Agreement  shall  not be  assigned  by
operation of law or  otherwise  without the prior  written  consent of the other
party,  provided,  that Cordiant or Sub may assign, in its sole discretion,  its
rights  and  obligations  hereunder  to any  direct  or  indirect  wholly  owned
subsidiary of Cordiant,  but no such assignment shall relieve Cordiant or Sub of
its  obligations  hereunder  if such  assignee  does not or cannot  perform such
obligations.

                  (e)  Amendments,  Waivers,  Etc.  This  Agreement  may  not be
amended,  changed,  supplemented,  waived or otherwise  modified or  terminated,
except upon the  execution and delivery of a written  agreement  executed by the
party to be charged  thereby  or,  with  respect to  termination,  as  otherwise
provided herein.

                  (f) Notices. All notices,  requests, claims, demands and other
communications  hereunder  shall be in writing  and shall be given (and shall be
deemed to have been duly received if so given) by hand delivery, telegram, telex
or telecopy,  or by mail (registered or certified mail, postage prepaid,  return
receipt requested) or by any courier service, such as Federal Express, providing
proof of  delivery.  All  communications  hereunder  shall be  delivered  to the
respective parties at the following addresses:

         If to the Stockholder:     William Leslie Milton
                                    c/o The Milton Group
                                    48 Broadway, Maidenhead,
                                    Berkshire SL6 1LU, UK
                                    Facsimile: 011-44-1628-630-298


         and

         If to Cordiant or
         Sub to:                    Cordiant Communications Group plc
                                    121-141 Westbourne Terrace
                                    London, W2 6JR
                                    Attention:  Deputy Finance Director
                                    Facsimile: 011-44-171-262-4300

         copy to:                   White & Case LLP
                                    1155 Avenue of the Americas
                                    New York, New York  10036-2787
                                    Attention:  Timothy B. Goodell, Esq.
                                    Facsimile:  (212) 354-8113

or to such  other  address  as the  person  to whom  notice  is  given  may have
previously furnished to the others in writing in the manner set forth above.

                  (g) Severability. Whenever possible, each provision or portion
of any provision of this  Agreement  will be interpreted in such manner as to be
effective and valid under  applicable law but if any provision or portion of any
provision of this Agreement is held to be invalid,  illegal or  unenforceable in
any  respect  under  any  applicable  law  or  rule  in any  jurisdiction,  such
invalidity,  illegality or unenforceability  will not affect any other provision
or portion of any provision in such  jurisdiction,  and this  Agreement  will be
reformed,  construed  and  enforced  in such  jurisdiction  as if such  invalid,
illegal or  unenforceable  provision or portion of any  provision had never been
contained herein.

                  (h)  Specific   Performance.   Each  of  the  parties   hereto
recognizes and  acknowledges  that a breach by it of any covenants or agreements
contained in this  Agreement will cause the aggrieved  party to sustain  damages
for which it would not have an  adequate  remedy at law for money  damages,  and
therefore each of the parties hereto agrees that in the event of any such breach
the aggrieved  party shall be entitled to the remedy of specific  performance of
such  covenants and agreements  and  injunctive  and other  equitable  relief in
addition to any other remedy to which it may be entitled, at law or in equity.

                  (i)  Remedies  Cumulative.  All  rights,  powers and  remedies
provided under this Agreement or otherwise available in respect hereof at law or
in equity  shall be  cumulative  and not  alternative,  and the  exercise of any
thereof by any party shall not preclude the  simultaneous  or later  exercise of
any other such right, power or remedy by such party.

                  (j) No Waiver. The failure of any party hereto to exercise any
right,  power or remedy provided under this Agreement or otherwise  available in
respect  hereof at law or in equity,  or to insist upon  compliance by any other
party hereto with its obligations  hereunder,  and any custom or practice of the
parties at variance with the terms hereof, shall not constitute a waiver by such
party of its right to exercise  any such or other  right,  power or remedy or to
demand such compliance.

                  (k)  No  Third  Party  Beneficiaries.  This  Agreement  is not
intended to be for the benefit of, and shall not be  enforceable  by, any person
or entity who or which is not a party hereto.

                  (l)  Governing  Law.  This  Agreement  shall be  governed  and
construed in accordance  with the laws of the State of New York,  without giving
effect to the principles of conflicts of law thereof.

                  (m) Jurisdiction. Each party hereby irrevocably submits to the
exclusive  jurisdiction of the Court of Chancery in the State of Delaware or the
United States District Court for the Southern  District of New York or any court
of the State of New York located in the City of New York in any action,  suit or
proceeding  arising in connection with this Agreement,  and agrees that any such
action,  suit or proceeding  shall be brought only in such court (and waives any
objection  based  on  forum  non  conveniens  or any  other  objection  to venue
therein); provided, however, that such consent to jurisdiction is solely for the
purpose  referred  to in this  paragraph  (1) and  shall  not be  deemed to be a
general  submission  to the  jurisdiction  of said  Courts  or in the  States of
Delaware  or New York other than for such  purposes.  Each party  hereto  hereby
waives any right to a trial by jury in connection with any such action,  suit or
proceeding.

                  (n) Descriptive Headings. The descriptive headings used herein
are inserted for  convenience  of reference only and are not intended to be part
of or to affect the meaning or interpretation of this Agreement.

                  (o)   Counterparts.   This   Agreement   may  be  executed  in
counterparts, each of which shall be deemed to be an original, but all of which,
taken together, shall constitute one and the same Agreement.




                        [SIGNATURES BEGIN ON NEXT PAGE]

<PAGE>


         IN WITNESS WHEREOF,  Cordiant, Sub and the Stockholder have caused this
Agreement to be duly executed as of the day and year first above written.


                                        CORDIANT COMMUNICATIONS GROUP PLC


                                        By: /s/ Arthur D'Angelo
                                            ------------------------------
                                            Name:  Arthur D'Angelo
                                            Title: Finance Director



                                        HEALTHWORLD ACQUISITION CORP.


                                        By: /s/ Arthur D'Angelo
                                            ------------------------------
                                            Name:  Arthur D'Angelo
                                            Title: President



                                        /s/ William Leslie Milton
                                        ----------------------------------
                                        William Leslie Milton


<PAGE>


          Schedule B to Stockholder Agreement of William Leslie Milton



William  Leslie  Milton has pledged  55,000 of his Shares as security for a loan
obligation.




                                                                       EXHIBIT 9


                              STOCKHOLDER AGREEMENT


         AGREEMENT dated November 9, 1999, among Cordiant  Communications  Group
plc,  a company  organized  under the laws of  England  and Wales  ("Cordiant"),
Healthworld Acquisition Corporation,  a Delaware corporation and a direct wholly
owned  subsidiary  of Cordiant  ("Sub"),  and The Spencer Falk Grantor  Retained
Annuity Trust u/t/a/d March 5, 1999 (the "Stockholder").

                              W I T N E S S E T H:

         WHEREAS,   concurrently  herewith,   Cordiant,   Sub,  and  Healthworld
Corporation,  a Delaware  corporation  (the  "Company"),  are  entering  into an
Agreement  and Plan of Merger (as such  agreement  may hereafter be amended from
time to time, the "Merger Agreement"), pursuant to which Sub will be merged with
and into the Company and the Company shall continue as the surviving corporation
(the "Merger");

         Whereas,  the  Stockholder  Beneficially  Owns,  as of the date hereof,
57,592 shares (the "Shares") of common stock,  $.01 par value per share,  of the
Company (the "Common Stock"); and

         WHEREAS,  as an inducement  and a condition to entering into the Merger
Agreement,  Cordiant and Sub have required that the Stockholder  agree,  and the
Stockholder has agreed, to enter into this Agreement;

         NOW,  THEREFORE,  in  consideration  of the  foregoing  and the  mutual
premises,  representations,   warranties,  covenants  and  agreements  contained
herein,  the parties  hereto,  intending  to be legally  bound,  hereby agree as
follows:

         1. Definitions. Unless other defined herein, all capitalized terms used
herein shall have the meanings given to such terms in the Merger Agreement.  For
purposes of this Agreement:

                  (a) "Beneficially Own" or "Beneficial  Ownership" with respect
to any securities  shall mean having  "beneficial  ownership" of such securities
(as determined pursuant to Rule 13d-3 under the Securities Exchange Act of 1934,
as  amended  (the  "Exchange  Act")),   including  pursuant  to  any  agreement,
arrangement or understanding, whether or not in writing.

         Without duplicative counting of the same securities by the same holder,
securities  Beneficially Owned by a Person shall include securities Beneficially
Owned by all other  Persons with whom such Person would  constitute a "group" as
within the meanings of Section 13(d)(3) of the Exchange Act.

                  (b) "Exchange Rate" means the average  currency  exchange rate
of pounds  sterling to US dollars based upon the noon buying rate in the City of
New York for cable  transfers in foreign  currencies as announced by the Federal
Reserve Bank of New York for customs  purposes over the 10  consecutive  Trading
Days  ending on the date on which the Stock  Options are  exercised  pursuant to
Section 3.

                  (c)  "Parent  Share  Value"  shall mean the product of (x) the
average of the closing  middle market  quotation of a Parent Share on the LSE as
reported in the Daily Official List of the London Stock Exchange for each of the
ten  consecutive  Trading Days ending on the day on which the Stock  Options are
exercised pursuant to Section 3 multiplied by (y) Exchange Rate.

                  (d) "Parent  Shares"  shall mean the ordinary  shares,  with a
nominal  value  of U.K.  fifty  pence  each  ("Ordinary  Shares"),  of  Cordiant
(including  any  options or other  rights to receive  Ordinary  Shares)  and the
American Depositary Shares, each representing the right to receive five Ordinary
Shares ("ADSs").

                  (e)   "Person"   shall   mean  an   individual,   corporation,
partnership,  limited  liability  company,  joint venture,  association,  trust,
unincorporated organization or other entity.

                  (f) "Share Value" shall be determined as follows:

                  (i)   if the Parent Share  Value is equal to or  greater  than
         $25.054  and equal to or less than  $3.4838,  the Share  Value shall be
         $20.00;

                  (ii)  if  the Parent  Share Value is greater than $3.4838, the
         Share Value  shall be  $23.00; and

                  (iii) if  the  Parent  Share  Value  is less than $2.5054, the
         Share Value shall be $17.00.

                  (g) "Trading Day" shall mean any day on which  securities  are
traded,  with  respect to ADSs,  on the New York Stock  Exchange,  Inc. and with
respect to Ordinary Shares, on the London Stock Exchange Limited.

         2.   Provisions   Concerning  Common Stock. (a) The Stockholder  hereby
agrees that during the period  described in clause (b) below,  at any meeting of
the holders of Common Stock of the Company,  however  called,  or in  connection
with any written  consent of the  holders of Common  Stock of the  Company,  the
Stockholder  shall vote (or cause to be voted) the Shares of Common Stock of the
Company,  (i) in favor of the Merger,  the execution and delivery by the Company
of the Merger  Agreement  and the approval of the terms  thereof and each of the
other actions  contemplated  by the Merger  Agreement and this Agreement and any
actions required in furtherance  thereof and hereof;  (ii) against any action or
agreement that would result in a breach in any material respect of any covenant,
representation  or warranty or any other  obligation or agreement of the Company
under the Merger  Agreement  or this  Agreement;  and (iii)  except as otherwise
agreed to in writing  in advance by  Cordiant,  against  the  following  actions
(other  than  the  Merger  and  the  transactions  contemplated  by  the  Merger
Agreement):  (A) any  extraordinary  corporate  transaction,  such as a  merger,
consolidation  or  other  business  combination  involving  the  Company  or its
Subsidiaries;  (B) a sale,  lease or transfer of a material  amount of assets of
the  Company  or  its  Subsidiaries,  or  a  reorganization,   recapitalization,
dissolution or liquidation of the Company or its Subsidiaries; (C) any change in
a majority of the persons who  constitute the board of directors of the Company;
(D) any change in the present  capitalization of the Company or any amendment of
the Company's  Certificate of  Incorporation  or Bylaws;  (E) any other material
change in the Company's corporate structure or business; or (F) any other action
involving the Company or its Subsidiaries which is intended, or could reasonably
be  expected,  to  materially  impede,   interfere  with,  delay,  postpone,  or
materially adversely affect the Merger and the transactions contemplated by this
Agreement and the Merger  Agreement.  The  Stockholder  shall not enter into any
agreement  or  understanding  with any  Person  the  effect  of  which  would be
inconsistent  with or violative of the provisions  and  agreements  contained in
this Section 2.

         (b) The  obligations  of the  Stockholders  under clauses (i), (ii) and
(iii)(C),  (D), (E) and (F) of this Section 2 shall  terminate on the earlier to
occur of the  Effective  Time and the  termination  of the Merger  Agreement  in
accordance  with its terms.  The  obligations  of the  Stockholder  under clause
(iii)(A)  and (B) of this  Section 2 shall  terminate on the earlier to occur of
the Effective Time and 120 days after the termination of the Merger Agreement in
accordance  with its terms (unless the Merger  Agreement is terminated by reason
of the  failure  to  obtain  Parent  Shareholders'  Approval  in which  case the
Stockholder's  obligations  under this Section 2 shall terminate  simultaneously
with the termination of the Merger Agreement).

         3.  Option  to  Purchase.  In order to induce Cordiant and Sub to enter
into the Merger Agreement,  the Stockholder  hereby grants to Sub an irrevocable
option (the "Stock  Options")  to  purchase,  all, and not less than all, of the
Shares at a purchase  price per share equal to the Share Value,  payable in cash
(the  "Purchase  Price"),  solely upon, and subject to, the terms and conditions
set forth below.  The Stock Options may only be exercised if Sub  simultaneously
exercises  all other  options held by it to purchase all, and not less than all,
of the shares of Common Stock covered by such  options.  The Stock Options shall
become  exercisable  solely in the event that the Merger Agreement is terminated
pursuant  to (i)  Section  9.1(b)(ii)  thereof,  but only if the  basis for such
termination  is the failure to obtain the Company  Stockholder  Approval or (ii)
Section  9.1(b)(iii)  thereof,  but only if the basis for such  termination is a
breach by the Company,  or the  Stockholder  materially  breaches any  agreement
contained in this Agreement, in which event the Stock Options shall, in any such
case, become immediately exercisable at any time and from time to time upon such
termination or upon Cordiant and Sub being informed of such breach,  as the case
may be, and until the date  which is 20 days after the date of such  termination
or the date on which  Cordiant and Sub are informed of such breach,  as the case
may be,  provided,  that if at the  expiration  of such 20-day  period the Stock
Options cannot be exercised by reason of any preliminary or final  injunction or
other order issued by any court or  governmental,  administrative  or regulatory
agency or authority  prohibiting  the exercise of the Stock Options  pursuant to
this  Agreement,  or because all  waiting  periods  under the  Hart-Scott-Rodino
Antitrust Improvements Act of 1976, as amended (the "HSR ACT"), required for the
purchase of the Shares upon such exercise shall not have expired or been waived,
the Stock Options shall be exercisable until 10 business days after the later of
the date on which such  impediment to exercise  shall have been removed or shall
have become final and not subject to appeal.  In all other instances,  the Stock
Options shall  terminate upon the  termination of the Merger  Agreement.  In the
event that Cordiant wishes to exercise the Stock Options,  Cordiant shall send a
written notice (the "Notice") to the  Stockholder  identifying  the place (which
shall be in New York City for each  Stockholder  who is a resident of the United
States  and in London  for each  Stockholder  who is a  resident  of the  United
Kingdom) and date (not less than two business days nor greater than ten business
days from the date of the  Notice)  for the  closing of such  purchase.  At such
closing,  Cordiant shall receive  certificates for the Shares, duly endorsed for
transfer,  and shall make  payment  therefor  by wire  transfer  of  immediately
available funds.

         4.  Disposition of Parent Shares.

                  (a)  Restrictions  on  Disposition.   The  Stockholder  hereby
agrees,  except as permitted in this Section 4(a) and Section 4(b) below, not to
directly or indirectly, offer to sell, contract to sell, transfer, assign, cause
to be  redeemed  or  otherwise  sell  or  dispose  of any of the  Parent  Shares
(collectively  a  "Disposition")  received by the stockholder in connection with
the Merger without the prior written consent of Cordiant. The parties agree that
any  Parent  Shares  received  by the  Stockholder  with  respect  to any shares
received after the date hereof under the earn-out  payments payable under of the
Agreement  and Plan of Merger (the  "Agreement")  dated as of August 1, 1999, by
and between the Company,  HC-Falk Acquisition Corp., Falk  Communications  Inc.,
Spencer  Falk and  Spencer  Falk,  as trustee  under the  Spencer  Falk  Grantor
Retained Annuity Trust u/t/a/d March 5, 1999 (the "Subsequent Shares") shall not
be subject to this Section  4(other than the last sentence of Section 4(b) which
shall  apply to the  Subsequent  shares  for a  period  of 180  days  after  the
Effective  Time).  Notwithstanding  anything  to the  contrary  provided in this
Agreement, the Stockholder shall have the right to transfer Parent Shares (i) to
any Family Member, (ii) to the trustee or trustees of a trust solely (except for
remote  contingent  interests) for the benefit of the Stockholder  and/or one or
more Family Members and/or a charitable  organization (a "Family Member Trust"),
(iii) to a foundation  created or established by the  Stockholder,  or any other
charitable  organization,  (iv) to a corporation of which the Stockholder and/or
any Family  Member  and/or any Family  Member Trust owns all of the  outstanding
capital  stock,  (v) to a limited  liability  company  of which the  Stockholder
and/or  any  Family  Member  and/or  any  Family  Member  Trust  owns all of the
outstanding membership interests, (vi) to a partnership of which the Stockholder
and/or  any  Family  Member  and/or  any  Family  Member  Trust  owns all of the
partnership  interests,  (vii)  to  the  executor,   administrator  or  personal
representative  of the estate of the Stockholder or any other Family Member,  or
(viii) to any guardian,  trustee or  conservator  appointed  with respect to the
assets of the Stockholder,  provided, that in the case of any such transfer, the
transferee shall execute an agreement to be bound by the terms of this Agreement
(each such transfer,  a "Permitted Transfer" and,  collectively,  the "Permitted
Transfers").  For purposes of this Agreement, "Family Member" shall mean (a) the
Stockholder's  spouse,  if  living  with  the  Stockholder,  (b)  any one of the
following:  the Stockholder's father,  mother, issue, brother or sister, and the
issue of a brother or sister,  and (c) the spouse of any Family Member described
in (b)  above,  if the  spouse  shall be living  with that  Family  Member.  The
Stockholder   hereby   agrees  and  consents  to  the  entry  of  stop  transfer
instructions with Cordiant's  transfer agent against the transfer of such Parent
Shares except in compliance with this Agreement.  Notwithstanding the foregoing,
the Stockholder may pledge,  hypothecate or otherwise grant a security  interest
in all or a portion of the Parent  Shares  beneficially  owned by him during the
term of this Agreement; provided, however, that any Person receiving such Parent
Shares shall be subject to all of the restrictions on Disposition of such Parent
Shares imposed by this Agreement to the same extent as the Stockholder.

                  (b) Permitted Dispositions. The Stockholder may not effect any
Disposition of Parent Shares  received by the Stockholder in connection with the
Merger  except as  follows:  (i)  during  the  twelve-month  period  immediately
following the Effective Time the  Stockholder  may effect the Disposition of not
more than 10% of the Parent Shares  Beneficially  Owned by the  Stockholder  and
(ii) during the  twenty-four-month  period  immediately  following the Effective
Time (the "Period"), the Stockholder may effect the Disposition of not more than
50% of the  Parent  Shares  Beneficially  Owned  by the  Stockholder.  Upon  the
expiration of the Period,  the Stockholder may effect the Dispositions of all or
any  portion  of the  Parent  Shares  Beneficially  Owned by him  subject to any
applicable  restrictions  under the Federal  Securities Law and  restrictions of
general  application  under  English law, the Listing  Rules of the London Stock
Exchange,  if applicable,  and  Cordiant's  policies made pursuant to such rules
regarding  dealings in Parent  Shares by  directors  and  relevant  employees of
Cordiant and its subsidiaries,  if applicable.  Notwithstanding  anything to the
contrary contained in this Section 4, the Stockholder hereby agrees that for the
period commencing at the Effective Time and ending on the date which is 180 days
after the  expiration  of the  Period,  the  Stockholder  shall give  Cordiant 1
business day prior written  notice of any intended  Disposition of Parent Shares
to be made by the  Stockholder  and at the request of Cordiant  agrees to effect
such Disposition through brokers or other financial intermediaries designated by
Cordiant to maintain an orderly  trading market for the Parent Shares,  provided
that  such  financial  intermediary  agrees  to  effect  the  Disposition  in  a
reasonable period following such notice.

         5.  Representations  and Warranties of the Stockholder. The Stockholder
hereby represents and warrants to each of Cordiant and Sub as follows:

                  (a) Ownership of Shares.  The Stockholder is the record holder
of or Beneficially  Owns the Shares.  On the date hereof,  the Shares constitute
all of the shares of Common Stock owned of record or  Beneficially  Owned by the
Stockholder  (excluding  any Stock Options (as defined in the Merger  Agreement)
held by the  Stockholder).  The Stockholder has sole voting power and sole power
to issue instructions with respect to the matters set forth in Section 2 hereof,
sole power of  disposition,  sole power of  conversion,  sole power to  exercise
dissenters'  rights and sole power to agree to all of the  matters  set forth in
this  agreement,  in  each  case  with  respect  to all of the  Shares,  with no
limitations,   qualifications  or  restrictions  on  such  rights,   subject  to
applicable securities laws and the terms of this Agreement.

                  (b) Power;  Binding  Agreement.  The Stockholder has the legal
capacity,  power and authority to enter into and perform all of his  obligations
under this Agreement. The execution,  delivery and performance of this Agreement
by the Stockholder will not violate any other Agreement to which the Stockholder
is a party including,  without  limitation,  any voting agreement,  shareholders
agreement or voting trust. This Agreement has been duly and validly executed and
delivered by the Stockholder  and  constitutes a valid and binding  agreement of
the  Stockholder,  enforceable  against the  Stockholder in accordance  with its
terms  except  that  such  enforceability  (i)  may be  limited  by  bankruptcy,
insolvency,  moratorium  or other similar laws  relating to the  enforcement  of
creditors' rights generally and (ii) is subject to general  principles of equity
and  discretion  of the court before which any  proceedings  seeking  injunctive
relief or specific  performance may be sought. There is no beneficiary or holder
of a voting  trust  certificate  or other  interest  of any  trust of which  the
Stockholder  is trustee whose consent is required for the execution and delivery
of this agreement or the  consummation  by the  Stockholder of the  transactions
contemplated  hereby. If the Stockholder is married and the Stockholder's Shares
constitute community property, this agreement has been duly authorized, executed
and  delivered  by,  and  constitutes  a valid and  binding  agreement  of,  the
Stockholder's  spouse,  enforceable  against such Person in accordance  with its
terms  except  that  such  enforceability  (i)  may be  limited  by  bankruptcy,
insolvency,  moratorium  or other similar laws  relating to the  enforcement  of
creditors' rights generally and (ii) is subject to general  principles of equity
and  discretion  of the court before which any  proceedings  seeking  injunctive
relief or specific performance may be sought.

                  (c) No Conflicts. Except for filings, permits, authorizations,
consents and  approvals  under the HSR Act and the  Securities  Act of 1933,  if
applicable,  (A) no  filing  with,  and no  permit,  authorization,  consent  or
approval of, any state or federal  public body or authority is necessary for the
execution  of this  Agreement by the  Stockholder  and the  consummation  by the
Stockholder  of  the  transactions  contemplated  hereby  and  (B)  none  of the
execution and delivery of this Agreement by the Stockholder, the consummation by
the  Stockholder of the  transactions  contemplated  hereby or compliance by the
Stockholder with any of the provisions  hereof shall, in a manner which would be
material  and  adverse  to the  ability of the  Stockholder  to  consummate  the
transactions contemplated hereby or to comply with the terms hereof, result in a
violation or breach of, or constitute  (with or without  notice or lapse of time
or both) a  default  (or give  rise to any  third  party  right of  termination,
cancellation,  material  modification or  acceleration)  under any of the terms,
conditions  or  provisions  of any note,  bond,  mortgage,  indenture,  license,
contract, commitment, arrangement,  understanding, agreement or other instrument
or  obligation of any kind to which the  Stockholder  is a party or by which the
Stockholder or any of the  Stockholder's  properties or assets may be bound,  or
(3) violate any order, writ, injunction,  decree, judgment, order, statute, rule
or  regulation  applicable  to the  Stockholder  or  any  of  the  Stockholder's
properties or assets.

                  (d) No  Encumbrances.  Except as applicable in connection with
the  transactions  contemplated  hereby or as set forth on  Schedule  B attached
hereto, the Shares and the certificates  representing the Shares are now, and at
all times  during the term  hereof  will be,  held by the  Stockholder,  or by a
nominee or custodian for the benefit of the  Stockholder,  free and clear of all
liens,  claims,  security  interests,  proxies,  voting  trusts  or  agreements,
understandings or arrangements or any other encumbrances whatsoever,  except for
any such encumbrances or proxies arising hereunder in favor of Cordiant.

                  (e) No Finder's Fees. No broker,  investment banker, financial
adviser  or other  person  is  entitled  to any  broker's,  finder's,  financial
adviser's or other similar fee or commission in connection with the transactions
contemplated  hereby  based  upon  arrangements  made  by or on  behalf  of  the
Stockholder  other than Bear Stearns & Co. Inc.,  the fees and expenses of which
shall be paid by the Company.

                  (f) Reliance by Cordiant and Sub. The Stockholder  understands
and acknowledges that Cordiant and Sub are entering into the Merger Agreement in
reliance upon the Stockholder's execution and delivery of this Agreement.

         6.  Additional  Covenants  of  the Stockholder.  The Stockholder hereby
covenants to each of Cordiant and Sub as follows:

                  (a) No  Solicitation.  Subject to the provisions  contained in
Section 10 of this  Agreement,  the  Stockholder  shall not, in his  capacity as
such,   directly  or  indirectly,   solicit  (including  by  way  of  furnishing
information)  or respond to any  inquiries  or the making of any proposal by any
Person or entity (other than Cordiant or any affiliate of Cordiant) with respect
to the Company that constitutes a Takeover Proposal. If the Stockholder receives
any such  inquiry  or  proposal,  then the  Stockholder  shall  promptly  inform
Cordiant of the existence  thereof.  The Stockholder will immediately  cease and
cause to be terminated any existing activities, discussions or negotiations with
any parties conducted heretofore with respect to any of the foregoing.

                  (b)   Restriction   on   Transfer   of  Shares,   Proxies  and
Non-Interference.  Beginning on the date hereof and ending on the later to occur
of (A) last date the Stock Options are exercisable  pursuant to Section 3 hereof
and (B) the date that all of the Stockholder's  obligations under Section 2 have
terminated, except as contemplated by this Agreement or the Merger Agreement, no
Stockholder shall,  directly or indirectly,  (i) offer for sale, sell, transfer,
tender,  pledge,  encumber,  assign or  otherwise  dispose of, or enter into any
contract,  option or other  arrangement  or  understanding  with  respect  to or
consent to the offer for sale,  sale,  transfer,  tender,  pledge,  encumbrance,
assignment  or other  disposition  of, any or all of the Shares or any  interest
therein;  (ii) except as contemplated  by this  Agreement,  grant any proxies or
powers of attorney,  deposit any of the Shares into a voting trust or enter into
a voting  agreement with respect to any of the Shares;  or (iii) take any action
that would make any  representation  or  warranty of the  Stockholder  contained
herein  untrue or incorrect or have the effect of  preventing  or disabling  the
Stockholder from performing the Stockholder's  obligations under this Agreement.
Notwithstanding   anything  to  the  contrary  provided  in  this  Agreement,  a
Stockholder  shall have the right to make  Permitted  Transfers  of Shares.  The
Stockholder agrees with, and covenants to, Sub that beginning on the date hereof
and  ending on the last date the  Stock  Options  are  exercisable  pursuant  to
Section 3 hereof,  the Stockholder  shall not request that the Company  register
the transfer  (book-entry  or otherwise) of any  certificate  or  uncertificated
interest  representing  any of the  Shares,  unless  such  transfer  is  made in
compliance with this Agreement (including the provisions of Section 2 hereof).

                  (c) Additional  Shares.  The  Stockholder  agrees,  while this
Agreement is in effect (i) to notify  Cordiant and Sub promptly of the number of
any shares of Common  Stock  acquired by the  Stockholder  after the date hereof
(the "Additional  Shares") and (ii) to vote such Additional Shares in accordance
with Section 2 hereof. Such Additional Shares shall also be subject to the Stock
Option granted to Sub pursuant to Section 3 hereof and the restriction contained
in Section 6(b)(i) and (ii) above.

         7.   Representations  and  Warranties of Cordiant and Sub. Cordiant and
Sub hereby  covenant,  represent  and  warrant to the  Stockholder  that each of
Cordiant and Sub has the legal  capacity,  power and authority to enter into and
perform all of such party's  obligations  under this  Agreement;  the execution,
delivery and  performance of this Agreement by Cordiant and Sub will not violate
or result in a breach of any other  material  agreement to which Cordiant or Sub
is a party; the execution and delivery of this Agreement and the consummation of
the transactions  contemplated hereby (i) have been duly authorized by the board
of  directors  of  Cordiant  and Sub,  and (ii) do not and will not  violate any
provision of the certificate of incorporation or by-laws of Cordiant or Sub; and
this  Agreement  has been duly and validly  executed  and  delivered  by each of
Cordiant and Sub and  constitutes  a valid and binding  agreement of such party,
enforceable against such party in accordance with its terms.

         8.  Further  Assurances.  From  time  to  time,  at the  other  party's
request and without further  consideration,  each party hereto shall execute and
deliver  such  additional   reasonable  documents  and  take  all  such  further
reasonable lawful action as may be necessary or desirable to consummate and make
effective,  in  the  most  expeditious  manner  practicable,   the  transactions
contemplated by this Agreement.

         9.  Termination;  Expenses  and  Fee. (a) The covenants and  agreements
contained herein with respect to the Shares shall terminate (i) in the event the
Merger  Agreement  is  terminated  in  accordance  with  its  terms,  upon  such
termination,  except that the  provisions of Sections 2, 3 and 6(b) hereof shall
survive any such  termination  solely in accordance with their terms and (ii) in
the event the Merger is  consummated,  at the  Effective  Time,  except that the
provisions of Section 4 hereof shall survive any such termination,  provided, in
each case, that the provisions of Section 12 and Section 13 hereof shall survive
any termination of this Agreement, and provided, further, that no termination of
this Agreement shall relieve any party of liability for a breach hereof.

         (b) Each party shall bear its own expenses in  connection  with  this
Agreement and the transactions contemplated hereby.

         10.   Stockholder  Capacity.  The  Stockholder  is not  executing  this
Agreement and does not make any agreement or understanding  herein in his or her
capacity as a director or officer of the  Company and nothing  contained  herein
shall limit or affect any actions taken by the  Stockholder in his capacity as a
director or officer of the Company to the extent such action is permitted by, or
not  prohibited  by,  the  Merger  Agreement,  and none of such  actions in such
capacities  shall be  deemed  to  constitute  a breach  of this  Agreement.  The
Stockholder  signs solely in his capacity as the record and beneficial owner of,
or the trustee of a trust whose  beneficiaries are the beneficial owners of, the
Shares.

         11.   Sophistication.  The  Stockholder  acknowledges  that  he  is  an
informed  and  sophisticated  investor  and,  together  with his  advisors,  has
undertaken  such  investigation  as they have deemed  necessary,  including  the
review of the Merger Agreement and this Agreement,  to enable the Stockholder to
make an informed and intelligent  decision with respect to the Merger  Agreement
and this Agreement and the transactions contemplated thereby and hereby.

         12.   Confidentiality.  Each  of the  parties  hereto  recognizes  that
successful  consummation of the transactions  contemplated by this Agreement may
be  dependent  upon  confidentiality  with  respect to the  matters  referred to
herein. In this connection, pending public disclosure thereof, each party hereby
agrees not to disclose or discuss  such  matters with anyone not a party to this
Agreement or the Merger Agreement (other than such party's counsel and advisors,
if any) without the prior written consent of the other party, except for filings
required  pursuant to the Exchange Act and the rules and regulations  thereunder
or disclosures  such party's  counsel  advises are necessary in order to fulfill
such  party's  obligations  imposed by law, in which event such party shall give
notice of such disclosure to the other party as promptly as practicable so as to
enable the other  party to seek a  protective  order  from a court of  competent
jurisdiction with respect thereto.

         13.  Miscellaneous.

                  (a) Entire Agreement.  This Agreement and the Merger Agreement
constitute the entire agreement  between the parties with respect to the subject
matter hereof and supersede all other prior agreements and understandings,  both
written and oral, between the parties with respect to the subject matter hereof.

                  (b) Certain Events. The Stockholder agrees that this Agreement
and the obligations hereunder shall attach to the Stockholder's Shares and shall
be binding upon any person or entity to which legal or  beneficial  ownership of
such Shares shall pass,  whether by operation  of law or  otherwise,  including,
without  limitation,  the  Stockholder's  heirs,  guardians,  administrators  or
successors,  provided,  that following the Effective  Time, this Agreement shall
not be binding on any  purchaser of Shares in a  transaction  made in compliance
with Section 4(b), other than Permitted Transfers.  Notwithstanding any transfer
of  Shares,  the  transferor  shall  remain  liable for the  performance  of all
obligations under this Agreement of the transferor.

                  (c) Change in Control.  In the event that after the  Effective
Time (i) any Person or group of Persons  acting in  concert  (as  defined in the
City Code on Take-overs and Mergers in the United Kingdom)  acquires an interest
in the equity share capital of Cordiant (an "Acquiring Person") and, immediately
following such  acquisition,  such person,  or group,  holds shares  entitled to
exercise  more than 50% of the votes  which may be cast at a general  meeting of
Cordiant or (ii) a majority of the board of  directors  of Cordiant  immediately
prior  to  such  Person  becoming  an  Acquiring  Person,  cease  to  thereafter
constitute a majority of the board of directors of Cordiant  (other than through
elections of directors  whose  nomination  for election by the  shareholders  of
Cordiant  were  approved by the vote of a majority of  directors of Cordiant who
were either  directors prior to a Person  becoming an Acquiring  Person or whose
election or  nomination  for  election  was so  previously  approved),  then the
restrictions on Dispositions contained in Section 4, shall terminate without any
action on the part of any party hereto.

                  (d)  Assignment.  This  Agreement  shall  not be  assigned  by
operation of law or  otherwise  without the prior  written  consent of the other
party,  provided,  that Cordiant or Sub may assign, in its sole discretion,  its
rights  and  obligations  hereunder  to any  direct  or  indirect  wholly  owned
subsidiary of Cordiant,  but no such assignment shall relieve Cordiant or Sub of
its  obligations  hereunder  if such  assignee  does not or cannot  perform such
obligations.

                  (e)  Amendments,  Waivers,  Etc.  This  Agreement  may  not be
amended,  changed,  supplemented,  waived or otherwise  modified or  terminated,
except upon the  execution and delivery of a written  agreement  executed by the
party to be charged  thereby  or,  with  respect to  termination,  as  otherwise
provided herein.

                  (f) Notices. All notices,  requests, claims, demands and other
communications  hereunder  shall be in writing  and shall be given (and shall be
deemed to have been duly received if so given) by hand delivery, telegram, telex
or telecopy,  or by mail (registered or certified mail, postage prepaid,  return
receipt requested) or by any courier service, such as Federal Express, providing
proof of  delivery.  All  communications  hereunder  shall be  delivered  to the
respective parties at the following addresses:

         If to the Stockholder:     The Spencer Falk Grantor Retained Annuity
                                    Trust u/t/a/d March 5, 1999
                                    c/o Healthworld Corporation
                                    100 Avenue of the Americas
                                    New York, New York 10010
                                    Attention: Spencer Falk
                                    Facsimile: (212) 966-2743

         and

         If to Cordiant or
         Sub to:                    Cordiant Communications Group plc
                                    121-141 Westbourne Terrace
                                    London W2 6JR
                                    Attention: Deputy Finance Director
                                    Facsimile: +44-141-262-4200

         copy to:                   White & Case LLP
                                    1155 Avenue of the Americas
                                    New York, New York  10036-2787
                                    Attention:  Timothy B. Goodell, Esq.
                                    Facsimile:  (212) 354-8113

or to such  other  address  as the  person  to whom  notice  is  given  may have
previously furnished to the others in writing in the manner set forth above.

                  (g) Severability. Whenever possible, each provision or portion
of any provision of this  Agreement  will be interpreted in such manner as to be
effective and valid under  applicable law but if any provision or portion of any
provision of this Agreement is held to be invalid,  illegal or  unenforceable in
any  respect  under  any  applicable  law  or  rule  in any  jurisdiction,  such
invalidity,  illegality or unenforceability  will not affect any other provision
or portion of any provision in such  jurisdiction,  and this  Agreement  will be
reformed,  construed  and  enforced  in such  jurisdiction  as if such  invalid,
illegal or  unenforceable  provision or portion of any  provision had never been
contained herein.

                  (h)  Specific   Performance.   Each  of  the  parties   hereto
recognizes and  acknowledges  that a breach by it of any covenants or agreements
contained in this  Agreement will cause the aggrieved  party to sustain  damages
for which it would not have an  adequate  remedy at law for money  damages,  and
therefore each of the parties hereto agrees that in the event of any such breach
the aggrieved  party shall be entitled to the remedy of specific  performance of
such  covenants and agreements  and  injunctive  and other  equitable  relief in
addition to any other remedy to which it may be entitled, at law or in equity.

                  (i)  Remedies  Cumulative.  All  rights,  powers and  remedies
provided under this Agreement or otherwise available in respect hereof at law or
in equity  shall be  cumulative  and not  alternative,  and the  exercise of any
thereof by any party shall not preclude the  simultaneous  or later  exercise of
any other such right, power or remedy by such party.

                  (j) No Waiver. The failure of any party hereto to exercise any
right,  power or remedy provided under this Agreement or otherwise  available in
respect  hereof at law or in equity,  or to insist upon  compliance by any other
party hereto with its obligations  hereunder,  and any custom or practice of the
parties at variance with the terms hereof, shall not constitute a waiver by such
party of its right to exercise  any such or other  right,  power or remedy or to
demand such compliance.

                  (k)  No  Third  Party  Beneficiaries.  This  Agreement  is not
intended to be for the benefit of, and shall not be  enforceable  by, any person
or entity who or which is not a party hereto.

                  (l)  Governing  Law.  This  Agreement  shall be  governed  and
construed in accordance  with the laws of the State of New York,  without giving
effect to the principles of conflicts of law thereof.

                  (m) Jurisdiction. Each party hereby irrevocably submits to the
exclusive  jurisdiction of the Court of Chancery in the State of Delaware or the
United States District Court for the Southern  District of New York or any court
of the State of New York located in the City of New York in any action,  suit or
proceeding  arising in connection with this Agreement,  and agrees that any such
action,  suit or proceeding  shall be brought only in such court (and waives any
objection  based  on  forum  non  conveniens  or any  other  objection  to venue
therein); provided, however, that such consent to jurisdiction is solely for the
purpose  referred  to in this  paragraph  (1) and  shall  not be  deemed to be a
general  submission  to the  jurisdiction  of said  Courts  or in the  States of
Delaware  or New York other than for such  purposes.  Each party  hereto  hereby
waives any right to a trial by jury in connection with any such action,  suit or
proceeding.

                  (n) Descriptive Headings. The descriptive headings used herein
are inserted for  convenience  of reference only and are not intended to be part
of or to affect the meaning or interpretation of this Agreement.

                  (o)   Counterparts.   This   Agreement   may  be  executed  in
counterparts, each of which shall be deemed to be an original, but all of which,
taken together, shall constitute one and the same Agreement.


                        [SIGNATURES BEGIN ON NEXT PAGE]

<PAGE>


         IN WITNESS WHEREOF,  Cordiant, Sub and the Stockholder have caused this
Agreement to be duly executed as of the day and year first above written.


                                        CORDIANT COMMUNICATIONS GROUP PLC


                                        By: /s/ Arthur D'Angelo
                                            -----------------------------
                                            Name:  Arthur D'Angelo
                                            Title: Finance Director



                                        HEALTHWORLD ACQUISITION CORP.


                                        By: /s/ Arthur D'Angelo
                                            -----------------------------
                                            Name:  Arthur D'Angelo
                                            Title: President



                                        THE SPENCER FALK GRANTOR RETAINED
                                        ANNUITY TRUST U/T/A/D MARCH 5, 1999


                                        By:
                                           --------------------------------
                                           Name:  Spencer Falk
                                           Title: Trustee



<PAGE>



                     Schedule B to Stockholder Agreement of
     The Spencer Falk Grantor Retained Annuity Trust u/t/a/d March 5, 1999



No exceptions.





                                                                      EXHIBIT 10


                              STOCKHOLDER AGREEMENT


         AGREEMENT dated November 9, 1999, among Cordiant  Communications  Group
plc,  a company  organized  under the laws of  England  and Wales  ("Cordiant"),
Healthworld Acquisition Corporation,  a Delaware corporation and a direct wholly
owned  subsidiary of Cordiant  ("Sub"),  and Steven  Girgenti  Grantor  Retained
Annuity Trust (the "Stockholder").

                              W I T N E S S E T H:

         WHEREAS,   concurrently  herewith,   Cordiant,   Sub,  and  Healthworld
Corporation,  a Delaware  corporation  (the  "Company"),  are  entering  into an
Agreement  and Plan of Merger (as such  agreement  may hereafter be amended from
time to time, the "Merger Agreement"), pursuant to which Sub will be merged with
and into the Company and the Company shall continue as the surviving corporation
(the "Merger");

         Whereas,  the  Stockholder  Beneficially  Owns,  as of the date hereof,
1,000,000  shares (the "Shares") of common stock,  $.01 par value per share,  of
the Company (the "Common Stock"); and

         WHEREAS,  as an inducement  and a condition to entering into the Merger
Agreement,  Cordiant and Sub have required that the Stockholder  agree,  and the
Stockholder has agreed, to enter into this Agreement;

         NOW,  THEREFORE,  in  consideration  of the  foregoing  and the  mutual
premises,  representations,   warranties,  covenants  and  agreements  contained
herein,  the parties  hereto,  intending  to be legally  bound,  hereby agree as
follows:

         1. Definitions. Unless other defined herein, all capitalized terms used
herein shall have the meanings given to such terms in the Merger Agreement.  For
purposes of this Agreement:

                  (a) "Beneficially Own" or "Beneficial  Ownership" with respect
to any securities  shall mean having  "beneficial  ownership" of such securities
(as determined pursuant to Rule 13d-3 under the Securities Exchange Act of 1934,
as  amended  (the  "Exchange  Act")),   including  pursuant  to  any  agreement,
arrangement or understanding, whether or not in writing.

         Without duplicative counting of the same securities by the same holder,
securities  Beneficially Owned by a Person shall include securities Beneficially
Owned by all other  Persons with whom such Person would  constitute a "group" as
within the meanings of Section 13(d)(3) of the Exchange Act.

                  (b) "Exchange Rate" means the average  currency  exchange rate
of pounds  sterling to US dollars based upon the noon buying rate in the City of
New York for cable  transfers in foreign  currencies as announced by the Federal
Reserve Bank of New York for customs  purposes over the 10  consecutive  Trading
Days  ending on the day on which the Stock  Options  are  exercised  pursuant to
Section 3.

                  (c)  "Parent  Share  Value"  shall mean the product of (x) the
average of the closing  middle market  quotation of a Parent Share on the LSE as
reported in the Daily Official List of the London Stock Exchange for each of the
ten  consecutive  Trading Days ending on the day on which the Stock  Options are
exercised pursuant to Section 3 multiplied by (y) Exchange Rate.

                  (d) "Parent  Shares"  shall mean the ordinary  shares,  with a
nominal  value  of U.K.  fifty  pence  each  ("Ordinary  Shares"),  of  Cordiant
(including  any  options or other  rights to receive  Ordinary  Shares)  and the
American Depositary Shares, each representing the right to receive five Ordinary
Shares ("ADSs").

                  (e)   "Person"   shall   mean  an   individual,   corporation,
partnership,  limited  liability  company,  joint venture,  association,  trust,
unincorporated organization or other entity.

                  (f) "Share Value" shall be determined as follows:

                  (i)    if the Parent Share Value is equal to or  greater  than
         $2.5054  and equal to or less than  $3.4838,  the Share  Value shall be
         $20.00;

                  (ii)   if the Parent Share Value is greater  than $3.4838, the
         Share Value  shall be  $23.00; and

                  (iii)  if the  Parent Share Value  is  less  than $2.5054, the
         Share Value shall be $17.00

                  (g) "Trading Day" shall mean any day on which  securities  are
traded,  with  respect to ADSs,  on the New York Stock  Exchange,  Inc. and with
respect to Ordinary Shares, on the London Stock Exchange Limited.

         2.    Provisions  Concerning  Common Stock. (a) The Stockholder  hereby
agrees that during the period  described in clause (b) below,  at any meeting of
the holders of Common Stock of the Company,  however  called,  or in  connection
with any written  consent of the  holders of Common  Stock of the  Company,  the
Stockholder  shall vote (or cause to be voted) the Shares of Common Stock of the
Company,  (i) in favor of the Merger,  the execution and delivery by the Company
of the Merger  Agreement  and the approval of the terms  thereof and each of the
other actions  contemplated  by the Merger  Agreement and this Agreement and any
actions required in furtherance  thereof and hereof;  (ii) against any action or
agreement that would result in a breach in any material respect of any covenant,
representation  or warranty or any other  obligation or agreement of the Company
under the Merger  Agreement  or this  Agreement;  and (iii)  except as otherwise
agreed to in writing  in advance by  Cordiant,  against  the  following  actions
(other  than  the  Merger  and  the  transactions  contemplated  by  the  Merger
Agreement):  (A) any  extraordinary  corporate  transaction,  such as a  merger,
consolidation  or  other  business  combination  involving  the  Company  or its
Subsidiaries;  (B) a sale,  lease or transfer of a material  amount of assets of
the  Company  or  its  Subsidiaries,  or  a  reorganization,   recapitalization,
dissolution or liquidation of the Company or its Subsidiaries; (C) any change in
a majority of the persons who  constitute the board of directors of the Company;
(D) any change in the present  capitalization of the Company or any amendment of
the Company's  Certificate of  Incorporation  or Bylaws;  (E) any other material
change in the Company's corporate structure or business; or (F) any other action
involving the Company or its Subsidiaries which is intended, or could reasonably
be  expected,  to  materially  impede,   interfere  with,  delay,  postpone,  or
materially adversely affect the Merger and the transactions contemplated by this
Agreement and the Merger  Agreement.  The  Stockholder  shall not enter into any
agreement  or  understanding  with any  Person  the  effect  of  which  would be
inconsistent  with or violative of the provisions  and  agreements  contained in
this Section 2.

         (b) The  obligations  of the  Stockholders  under clauses (i), (ii) and
(iii)(C),  (D), (E) and (F) of this Section 2 shall  terminate on the earlier to
occur of the  Effective  Time and the  termination  of the Merger  Agreement  in
accordance  with its terms.  The  obligations  of the  Stockholder  under clause
(iii)(A)  and (B) of this  Section 2 shall  terminate on the earlier to occur of
the Effective Time and 120 days after the termination of the Merger Agreement in
accordance  with its terms (unless the Merger  Agreement is terminated by reason
of the  failure  to  obtain  Parent  Shareholders'  Approval  in which  case the
Stockholder's  obligations  under this Section 2 shall terminate  simultaneously
with the termination of the Merger Agreement).

         3.  Option  to  Purchase.  In order to induce Cordiant and Sub to enter
into the Merger Agreement,  the Stockholder  hereby grants to Sub an irrevocable
option (the "Stock  Options")  to  purchase,  all, and not less than all, of the
Shares at a purchase  price per share equal to the Share Value,  payable in cash
(the  "Purchase  Price"),  solely upon, and subject to, the terms and conditions
set forth below.  The Stock Options may only be exercised if Sub  simultaneously
exercises  all other  options held by it to purchase all, and not less than all,
of the shares of Common Stock covered by such  options.  The Stock Options shall
become  exercisable  solely in the event that the Merger Agreement is terminated
pursuant  to (i)  Section  9.1(b)(ii)  thereof,  but only if the  basis for such
termination  is the failure to obtain the Company  Stockholder  Approval or (ii)
Section  9.1(b)(iii)  thereof,  but only if the basis for such  termination is a
breach by the Company,  or the  Stockholder  materially  breaches any  agreement
contained in this Agreement, in which event the Stock Options shall, in any such
case, become immediately exercisable at any time and from time to time upon such
termination or upon Cordiant and Sub being informed of such breach,  as the case
may be, and until the date  which is 20 days after the date of such  termination
or the date on which  Cordiant and Sub are informed of such breach,  as the case
may be,  provided,  that if at the  expiration  of such 20-day  period the Stock
Options cannot be exercised by reason of any preliminary or final  injunction or
other order issued by any court or  governmental,  administrative  or regulatory
agency or authority  prohibiting  the exercise of the Stock Options  pursuant to
this  Agreement,  or because all  waiting  periods  under the  Hart-Scott-Rodino
Antitrust Improvements Act of 1976, as amended (the "HSR ACT"), required for the
purchase of the Shares upon such exercise shall not have expired or been waived,
the Stock Options shall be exercisable until 10 business days after the later of
the date on which such  impediment to exercise  shall have been removed or shall
have become final and not subject to appeal.  In all other instances,  the Stock
Options shall  terminate upon the  termination of the Merger  Agreement.  In the
event that Cordiant wishes to exercise the Stock Options,  Cordiant shall send a
written notice (the "Notice") to the  Stockholder  identifying  the place (which
shall be in New York City for each  Stockholder  who is a resident of the United
States  and in London  for each  Stockholder  who is a  resident  of the  United
Kingdom) and date (not less than two business days nor greater than ten business
days from the date of the  Notice)  for the  closing of such  purchase.  At such
closing,  Cordiant shall receive  certificates for the Shares, duly endorsed for
transfer,  and shall make  payment  therefor  by wire  transfer  of  immediately
available funds.

         4.  Disposition of Parent Shares.

                  (a)  Restrictions  on  Disposition.   The  Stockholder  hereby
agrees,  except as permitted in this Section 4(a) and Section 4(b) below, not to
directly or indirectly, offer to sell, contract to sell, transfer, assign, cause
to be  redeemed  or  otherwise  sell  or  dispose  of any of the  Parent  Shares
(collectively  a  "Disposition")  received by the stockholder in connection with
the  Merger  without  the prior  written  consent of  Cordiant.  Notwithstanding
anything to the contrary provided in this Agreement,  the Stockholder shall have
the right to  transfer  Parent  Shares  (i) to any  Family  Member,  (ii) to the
trustee or trustees of a trust solely (except for remote  contingent  interests)
for the benefit of the  Stockholder  and/or one or more Family  Members and/or a
charitable organization (a "Family Member Trust"), (iii) to a foundation created
or established by the Stockholder, or any other charitable organization, (iv) to
a  corporation  of which the  Stockholder  and/or any Family  Member  and/or any
Family Member Trust owns all of the outstanding  capital stock, (v) to a limited
liability  company of which the Stockholder  and/or any Family Member and/or any
Family Member Trust owns all of the outstanding membership interests,  (vi) to a
partnership of which the Stockholder  and/or any Family Member and/or any Family
Member  Trust  owns all of the  partnership  interests,  (vii) to the  executor,
administrator or personal representative of the estate of the Stockholder or any
other Family Member, or (viii) to any guardian, trustee or conservator appointed
with respect to the assets of the Stockholder, provided, that in the case of any
such  transfer,  the  transferee  shall  execute an agreement to be bound by the
terms of this  Agreement  (each  such  transfer,  a  "Permitted  Transfer"  and,
collectively,  the  "Permitted  Transfers").  For  purposes  of this  Agreement,
"Family  Member"  shall mean (a) the  Stockholder's  spouse,  if living with the
Stockholder,  (b) any one of the following:  the Stockholder's  father,  mother,
issue,  brother  or sister,  and the issue of a brother  or sister,  and (c) the
spouse of any  Family  Member  described  in (b) above,  if the spouse  shall be
living with that Family Member.  The  Stockholder  hereby agrees and consents to
the entry of stop transfer  instructions with Cordiant's  transfer agent against
the transfer of such Parent  Shares except in  compliance  with this  Agreement.
Notwithstanding  the  foregoing,  the  Stockholder  may pledge,  hypothecate  or
otherwise  grant a security  interest  in all or a portion of the Parent  Shares
beneficially owned by him during the term of this Agreement;  provided, however,
that any Person  receiving  such  Parent  Shares  shall be subject to all of the
restrictions  on  Disposition of such Parent Shares imposed by this Agreement to
the same extent as the Stockholder.

                  (b) Permitted Dispositions. The Stockholder may not effect any
Disposition of Parent Shares  received by the Stockholder in connection with the
Merger  except as  follows:  (i)  during  the  twelve-month  period  immediately
following the Effective Time the  Stockholder  may effect the Disposition of not
more than 10% of the Parent Shares  Beneficially  Owned by the  Stockholder  and
(ii) during the  twenty-four-month  period  immediately  following the Effective
Time (the "Period"), the Stockholder may effect the Disposition of not more than
50% of the  Parent  Shares  Beneficially  Owned  by the  Stockholder.  Upon  the
expiration of the Period,  the Stockholder may effect the Dispositions of all or
any  portion  of the  Parent  Shares  Beneficially  Owned by him  subject to any
applicable  restrictions  under the Federal  Securities Law and  restrictions of
general  application  under  English law, the Listing  Rules of the London Stock
Exchange,  if applicable,  and  Cordiant's  policies made pursuant to such rules
regarding  dealings in Parent  Shares by  directors  and  relevant  employees of
Cordiant and its subsidiaries,  if applicable.  Notwithstanding  anything to the
contrary contained in this Section 4, the Stockholder hereby agrees that for the
period commencing at the Effective Time and ending on the date which is 180 days
after the  expiration  of the  Period,  the  Stockholder  shall give  Cordiant 1
business day prior written  notice of any intended  Disposition of Parent Shares
to be made by the  Stockholder  and at the request of Cordiant  agrees to effect
such Disposition through brokers or other financial intermediaries designated by
Cordiant to maintain an orderly  trading market for the Parent Shares,  provided
that  such  financial   intermediary  agrees  to  effect  and  does  effect  the
Disposition in a reasonable period following such notice.

         5. Representations  and  Warranties of the Stockholder. The Stockholder
hereby represents and warrants to each of Cordiant and Sub as follows:

                  (a) Ownership of Shares.  The Stockholder is the record holder
of or Beneficially  Owns the Shares.  On the date hereof,  the Shares constitute
all of the shares of Common Stock owned of record or  Beneficially  Owned by the
Stockholder  (excluding  any Stock Options (as defined in the Merger  Agreement)
held by the  Stockholder).  The Stockholder has sole voting power and sole power
to issue instructions with respect to the matters set forth in Section 2 hereof,
sole power of  disposition,  sole power of  conversion,  sole power to  exercise
dissenters'  rights and sole power to agree to all of the  matters  set forth in
this  agreement,  in  each  case  with  respect  to all of the  Shares,  with no
limitations,   qualifications  or  restrictions  on  such  rights,   subject  to
applicable securities laws and the terms of this Agreement.

                  (b) Power;  Binding  Agreement.  The Stockholder has the legal
capacity,  power and authority to enter into and perform all of his  obligations
under this Agreement. The execution,  delivery and performance of this Agreement
by the Stockholder will not violate any other Agreement to which the Stockholder
is a party including,  without  limitation,  any voting agreement,  shareholders
agreement or voting trust. This Agreement has been duly and validly executed and
delivered by the Stockholder  and  constitutes a valid and binding  agreement of
the  Stockholder,  enforceable  against the  Stockholder in accordance  with its
terms  except  that  such  enforceability  (i)  may be  limited  by  bankruptcy,
insolvency,  moratorium  or other similar laws  relating to the  enforcement  of
creditors' rights generally and (ii) is subject to general  principles of equity
and  discretion  of the court before which any  proceedings  seeking  injunctive
relief or specific  performance may be sought. There is no beneficiary or holder
of a voting  trust  certificate  or other  interest  of any  trust of which  the
Stockholder  is trustee whose consent is required for the execution and delivery
of this agreement or the  consummation  by the  Stockholder of the  transactions
contemplated  hereby. If the Stockholder is married and the Stockholder's Shares
constitute community property, this agreement has been duly authorized, executed
and  delivered  by,  and  constitutes  a valid and  binding  agreement  of,  the
Stockholder's  spouse,  enforceable  against such Person in accordance  with its
terms  except  that  such  enforceability  (i)  may be  limited  by  bankruptcy,
insolvency,  moratorium  or other similar laws  relating to the  enforcement  of
creditors' rights generally and (ii) is subject to general  principles of equity
and  discretion  of the court before which any  proceedings  seeking  injunctive
relief or specific performance may be sought.

                  (c) No Conflicts. Except for filings, permits, authorizations,
consents and  approvals  under the HSR Act and the  Securities  Act of 1933,  if
applicable,  (A) no  filing  with,  and no  permit,  authorization,  consent  or
approval of, any state or federal  public body or authority is necessary for the
execution  of this  Agreement by the  Stockholder  and the  consummation  by the
Stockholder  of  the  transactions  contemplated  hereby  and  (B)  none  of the
execution and delivery of this Agreement by the Stockholder, the consummation by
the  Stockholder of the  transactions  contemplated  hereby or compliance by the
Stockholder with any of the provisions  hereof shall, in a manner which would be
material  and  adverse  to the  ability of the  Stockholder  to  consummate  the
transactions contemplated hereby or to comply with the terms hereof, result in a
violation or breach of, or constitute  (with or without  notice or lapse of time
or both) a  default  (or give  rise to any  third  party  right of  termination,
cancellation,  material  modification or  acceleration)  under any of the terms,
conditions  or  provisions  of any note,  bond,  mortgage,  indenture,  license,
contract, commitment, arrangement,  understanding, agreement or other instrument
or  obligation of any kind to which the  Stockholder  is a party or by which the
Stockholder or any of the  Stockholder's  properties or assets may be bound,  or
(3) violate any order, writ, injunction,  decree, judgment, order, statute, rule
or  regulation  applicable  to the  Stockholder  or  any  of  the  Stockholder's
properties or assets.

                  (d) No  Encumbrances.  Except as applicable in connection with
the  transactions  contemplated  hereby or as set forth on  Schedule  B attached
hereto, the Shares and the certificates  representing the Shares are now, and at
all times  during the term  hereof  will be,  held by the  Stockholder,  or by a
nominee or custodian for the benefit of the  Stockholder,  free and clear of all
liens,  claims,  security  interests,  proxies,  voting  trusts  or  agreements,
understandings or arrangements or any other encumbrances whatsoever,  except for
any such encumbrances or proxies arising hereunder in favor of Cordiant.

                  (e) No Finder's Fees. No broker,  investment banker, financial
adviser  or other  person  is  entitled  to any  broker's,  finder's,  financial
adviser's or other similar fee or commission in connection with the transactions
contemplated  hereby  based  upon  arrangements  made  by or on  behalf  of  the
Stockholder  other than Bear Stearns & Co. Inc.,  the fees and expenses of which
shall be paid by the Company.

                  (f) Reliance by Cordiant and Sub. The Stockholder  understands
and acknowledges that Cordiant and Sub are entering into the Merger Agreement in
reliance upon the Stockholder's execution and delivery of this Agreement.

         6.  Additional  Covenants of   the Stockholder.  The Stockholder hereby
covenants to each of Cordiant and Sub as follows:

                  (a) No  Solicitation.  Subject to the provisions  contained in
Section 10 of this  Agreement,  the  Stockholder  shall not, in his  capacity as
such,   directly  or  indirectly,   solicit  (including  by  way  of  furnishing
information)  or respond to any  inquiries  or the making of any proposal by any
Person or entity (other than Cordiant or any affiliate of Cordiant) with respect
to the Company that constitutes a Takeover Proposal. If the Stockholder receives
any such  inquiry  or  proposal,  then the  Stockholder  shall  promptly  inform
Cordiant of the existence  thereof.  The Stockholder will immediately  cease and
cause to be terminated any existing activities, discussions or negotiations with
any parties conducted heretofore with respect to any of the foregoing.

                  (b)   Restriction   on   Transfer   of  Shares,   Proxies  and
Non-Interference.  Beginning on the date hereof and ending on the later to occur
of (A) last date the Stock Options are exercisable  pursuant to Section 3 hereof
and (B) the date that all of the Stockholder's  obligations under Section 2 have
terminated, except as contemplated by this Agreement or the Merger Agreement, no
Stockholder shall,  directly or indirectly,  (i) offer for sale, sell, transfer,
tender,  pledge,  encumber,  assign or  otherwise  dispose of, or enter into any
contract,  option or other  arrangement  or  understanding  with  respect  to or
consent to the offer for sale,  sale,  transfer,  tender,  pledge,  encumbrance,
assignment  or other  disposition  of, any or all of the Shares or any  interest
therein;  (ii) except as contemplated  by this  Agreement,  grant any proxies or
powers of attorney,  deposit any of the Shares into a voting trust or enter into
a voting  agreement with respect to any of the Shares;  or (iii) take any action
that would make any  representation  or  warranty of the  Stockholder  contained
herein  untrue or incorrect or have the effect of  preventing  or disabling  the
Stockholder from performing the Stockholder's  obligations under this Agreement.
Notwithstanding   anything  to  the  contrary  provided  in  this  Agreement,  a
Stockholder  shall have the right to make  Permitted  Transfers  of Shares.  The
Stockholder agrees with, and covenants to, Sub that beginning on the date hereof
and  ending on the last date the  Stock  Options  are  exercisable  pursuant  to
Section 3 hereof,  the Stockholder  shall not request that the Company  register
the transfer  (book-entry  or otherwise) of any  certificate  or  uncertificated
interest  representing  any of the  Shares,  unless  such  transfer  is  made in
compliance with this Agreement (including the provisions of Section 2 hereof).

                  (c) Additional  Shares.  The  Stockholder  agrees,  while this
Agreement is in effect (i) to notify  Cordiant and Sub promptly of the number of
any shares of Common  Stock  acquired by the  Stockholder  after the date hereof
(the "Additional  Shares") and (ii) to vote such Additional Shares in accordance
with Section 2 hereof. Such Additional Shares shall also be subject to the Stock
Option granted to Sub pursuant to Section 3 hereof and the restriction contained
in Section 6(b)(i) and (ii) above.

         7.  Representations  and  Warranties  of Cordiant and Sub. Cordiant and
Sub hereby  covenant,  represent  and  warrant to the  Stockholder  that each of
Cordiant and Sub has the legal  capacity,  power and authority to enter into and
perform all of such party's  obligations  under this  Agreement;  the execution,
delivery and  performance of this Agreement by Cordiant and Sub will not violate
or result in a breach of any other  material  agreement to which Cordiant or Sub
is a party; the execution and delivery of this Agreement and the consummation of
the transactions  contemplated hereby (i) have been duly authorized by the board
of  directors  of  Cordiant  and Sub,  and (ii) do not and will not  violate any
provision of the certificate of incorporation or by-laws of Cordiant or Sub; and
this  Agreement  has been duly and validly  executed  and  delivered  by each of
Cordiant and Sub and  constitutes  a valid and binding  agreement of such party,
enforceable against such party in accordance with its terms.

         8.  Further  Assurances.  From  time  to  time,  at the  other  party's
request and without further  consideration,  each party hereto shall execute and
deliver  such  additional   reasonable  documents  and  take  all  such  further
reasonable lawful action as may be necessary or desirable to consummate and make
effective,  in  the  most  expeditious  manner  practicable,   the  transactions
contemplated by this Agreement.

         9.  Termination;  Expenses  and  Fee. (a) The covenants and  agreements
contained herein with respect to the Shares shall terminate (i) in the event the
Merger  Agreement  is  terminated  in  accordance  with  its  terms,  upon  such
termination,  except that the  provisions of Sections 2, 3 and 6(b) hereof shall
survive any such  termination  solely in accordance with their terms and (ii) in
the event the Merger is  consummated,  at the  Effective  Time,  except that the
provisions of Section 4 hereof shall survive any such termination,  provided, in
each case, that the provisions of Section 12 and Section 13 hereof shall survive
any termination of this Agreement, and provided, further, that no termination of
this Agreement shall relieve any party of liability for a breach hereof.

         (b) Each party shall bear its own  expenses  in  connection  with  this
Agreement and the transactions contemplated hereby.

         10. Stockholder  Capacity.   The  Stockholder  is  not  executing  this
Agreement and does not make any agreement or understanding  herein in his or her
capacity as a director or officer of the  Company and nothing  contained  herein
shall limit or affect any actions taken by the  Stockholder in his capacity as a
director or officer of the Company to the extent such action is permitted by, or
not  prohibited  by,  the  Merger  Agreement,  and none of such  actions in such
capacities  shall be  deemed  to  constitute  a breach  of this  Agreement.  The
Stockholder  signs solely in his capacity as the record and beneficial owner of,
or the trustee of a trust whose  beneficiaries are the beneficial owners of, the
Shares.

         11.  Sophistication.   The  Stockholder  acknowledges  that  he  is  an
informed  and  sophisticated  investor  and,  together  with his  advisors,  has
undertaken  such  investigation  as they have deemed  necessary,  including  the
review of the Merger Agreement and this Agreement,  to enable the Stockholder to
make an informed and intelligent  decision with respect to the Merger  Agreement
and this Agreement and the transactions contemplated thereby and hereby.

         12.   Confidentiality.  Each  of the  parties  hereto  recognizes  that
successful  consummation of the transactions  contemplated by this Agreement may
be  dependent  upon  confidentiality  with  respect to the  matters  referred to
herein. In this connection, pending public disclosure thereof, each party hereby
agrees not to disclose or discuss  such  matters with anyone not a party to this
Agreement or the Merger Agreement (other than such party's counsel and advisors,
if any) without the prior written consent of the other party, except for filings
required  pursuant to the Exchange Act and the rules and regulations  thereunder
or disclosures  such party's  counsel  advises are necessary in order to fulfill
such  party's  obligations  imposed by law, in which event such party shall give
notice of such disclosure to the other party as promptly as practicable so as to
enable the other  party to seek a  protective  order  from a court of  competent
jurisdiction with respect thereto.

         13.   Miscellaneous.

                  (a) Entire Agreement.  This Agreement and the Merger Agreement
constitute the entire agreement  between the parties with respect to the subject
matter hereof and supersede all other prior agreements and understandings,  both
written and oral, between the parties with respect to the subject matter hereof.

                  (b) Certain Events. The Stockholder agrees that this Agreement
and the obligations hereunder shall attach to the Stockholder's Shares and shall
be binding upon any person or entity to which legal or  beneficial  ownership of
such Shares shall pass,  whether by operation  of law or  otherwise,  including,
without  limitation,  the  Stockholder's  heirs,  guardians,  administrators  or
successors,  provided,  that following the Effective  Time, this Agreement shall
not be binding on any  purchaser of Shares in a  transaction  made in compliance
with Section 4(b), other than Permitted Transfers.  Notwithstanding any transfer
of  Shares,  the  transferor  shall  remain  liable for the  performance  of all
obligations under this Agreement of the transferor.

                  (c) Change in Control.  In the event that after the  Effective
Time (i) any Person or group of Persons  acting in  concert  (as  defined in the
City Code on Take-overs and Mergers in the United Kingdom)  acquires an interest
in the equity share capital of Cordiant (an "Acquiring Person") and, immediately
following such  acquisition,  such person,  or group,  holds shares  entitled to
exercise  more than 50% of the votes  which may be cast at a general  meeting of
Cordiant or (ii) a majority of the board of  directors  of Cordiant  immediately
prior  to  such  Person  becoming  an  Acquiring  Person,  cease  to  thereafter
constitute a majority of the board of directors of Cordiant  (other than through
elections of directors  whose  nomination  for election by the  shareholders  of
Cordiant  were  approved by the vote of a majority of  directors of Cordiant who
were either  directors prior to a Person  becoming an Acquiring  Person or whose
election or  nomination  for  election  was so  previously  approved),  then the
restrictions on Dispositions contained in Section 4, shall terminate without any
action on the part of any party hereto.

                  (d)  Assignment.  This  Agreement  shall  not be  assigned  by
operation of law or  otherwise  without the prior  written  consent of the other
party,  provided,  that Cordiant or Sub may assign, in its sole discretion,  its
rights  and  obligations  hereunder  to any  direct  or  indirect  wholly  owned
subsidiary of Cordiant,  but no such assignment shall relieve Cordiant or Sub of
its  obligations  hereunder  if such  assignee  does not or cannot  perform such
obligations.

                  (e)  Amendments,  Waivers,  Etc.  This  Agreement  may  not be
amended,  changed,  supplemented,  waived or otherwise  modified or  terminated,
except upon the  execution and delivery of a written  agreement  executed by the
party to be charged  thereby  or,  with  respect to  termination,  as  otherwise
provided herein.

                  (f) Notices. All notices,  requests, claims, demands and other
communications  hereunder  shall be in writing  and shall be given (and shall be
deemed to have been duly received if so given) by hand delivery, telegram, telex
or telecopy,  or by mail (registered or certified mail, postage prepaid,  return
receipt requested) or by any courier service, such as Federal Express, providing
proof of  delivery.  All  communications  hereunder  shall be  delivered  to the
respective parties at the following addresses:

         If to the Stockholder:     Steven Girgenti Grantor Retained
                                      Annuity Trust
                                    c/o Healthworld Corporation
                                    100 Avenue of the Americas
                                    New York, New York 10010
                                    Attention: Steven Girgenti
                                    Facsimile: (212) 966-2743

         and

         If to Cordiant or
         Sub to:                    Cordiant Communications Group plc
                                    121-141 Westbourne Terrace
                                    london W2 6JR
                                    Attention: Deputy Finance Director
                                    Facsimile: +44-171-262-4300

         copy to:                   White & Case LLP
                                    1155 Avenue of the Americas
                                    New York, New York  10036-2787
                                    Attention:  Timothy B. Goodell, Esq.
                                    Facsimile:  (212) 354-8113

or to such  other  address  as the  person  to whom  notice  is  given  may have
previously furnished to the others in writing in the manner set forth above.

                  (g) Severability. Whenever possible, each provision or portion
of any provision of this  Agreement  will be interpreted in such manner as to be
effective and valid under  applicable law but if any provision or portion of any
provision of this Agreement is held to be invalid,  illegal or  unenforceable in
any  respect  under  any  applicable  law  or  rule  in any  jurisdiction,  such
invalidity,  illegality or unenforceability  will not affect any other provision
or portion of any provision in such  jurisdiction,  and this  Agreement  will be
reformed,  construed  and  enforced  in such  jurisdiction  as if such  invalid,
illegal or  unenforceable  provision or portion of any  provision had never been
contained herein.

                  (h)  Specific   Performance.   Each  of  the  parties   hereto
recognizes and  acknowledges  that a breach by it of any covenants or agreements
contained in this  Agreement will cause the aggrieved  party to sustain  damages
for which it would not have an  adequate  remedy at law for money  damages,  and
therefore each of the parties hereto agrees that in the event of any such breach
the aggrieved  party shall be entitled to the remedy of specific  performance of
such  covenants and agreements  and  injunctive  and other  equitable  relief in
addition to any other remedy to which it may be entitled, at law or in equity.

                  (i)  Remedies  Cumulative.  All  rights,  powers and  remedies
provided under this Agreement or otherwise available in respect hereof at law or
in equity  shall be  cumulative  and not  alternative,  and the  exercise of any
thereof by any party shall not preclude the  simultaneous  or later  exercise of
any other such right, power or remedy by such party.

                  (j) No Waiver. The failure of any party hereto to exercise any
right,  power or remedy provided under this Agreement or otherwise  available in
respect  hereof at law or in equity,  or to insist upon  compliance by any other
party hereto with its obligations  hereunder,  and any custom or practice of the
parties at variance with the terms hereof, shall not constitute a waiver by such
party of its right to exercise  any such or other  right,  power or remedy or to
demand such compliance.

                  (k)  No  Third  Party  Beneficiaries.  This  Agreement  is not
intended to be for the benefit of, and shall not be  enforceable  by, any person
or entity who or which is not a party hereto.

                  (l)  Governing  Law.  This  Agreement  shall be  governed  and
construed in accordance  with the laws of the State of New York,  without giving
effect to the principles of conflicts of law thereof.

                  (m) Jurisdiction. Each party hereby irrevocably submits to the
exclusive  jurisdiction of the Court of Chancery in the State of Delaware or the
United States District Court for the Southern  District of New York or any court
of the State of New York located in the City of New York in any action,  suit or
proceeding  arising in connection with this Agreement,  and agrees that any such
action,  suit or proceeding  shall be brought only in such court (and waives any
objection  based  on  forum  non  conveniens  or any  other  objection  to venue
therein); provided, however, that such consent to jurisdiction is solely for the
purpose  referred  to in this  paragraph  (1) and  shall  not be  deemed to be a
general  submission  to the  jurisdiction  of said  Courts  or in the  States of
Delaware  or New York other than for such  purposes.  Each party  hereto  hereby
waives any right to a trial by jury in connection with any such action,  suit or
proceeding.

                  (n) Descriptive Headings. The descriptive headings used herein
are inserted for  convenience  of reference only and are not intended to be part
of or to affect the meaning or interpretation of this Agreement.

                  (o)   Counterparts.   This   Agreement   may  be  executed  in
counterparts, each of which shall be deemed to be an original, but all of which,
taken together, shall constitute one and the same Agreement.


                        [SIGNATURES BEGIN ON NEXT PAGE]

<PAGE>


         IN WITNESS WHEREOF,  Cordiant, Sub and the Stockholder have caused this
Agreement to be duly executed as of the day and year first above written.


                                        CORDIANT COMMUNICATIONS GROUP PLC


                                        By: /s/ Arthur D'Angelo
                                            -----------------------------
                                            Name:  Arthur D'Angelo
                                            Title: Finance Director



                                        HEALTHWORLD ACQUISITION CORP.


                                        By: /s/ Arthur D'Angelo
                                            -----------------------------
                                            Name:  Arthur D'Angelo
                                            Title: President


                                        STEVEN GIRGENTI GRANTOR RETAINED
                                          ANNUITY TRUST

                                        By: /s/ Steven Girgenti
                                            -----------------------------
                                            Name:  Steven Girgenti
                                            Title: Trustee


<PAGE>


                     Schedule B to Stockholder Agreement of
                 Steven Girgenti Grantor Retained Annuity Trust



No exceptions.





                                                                      EXHIBIT 11


                              STOCKHOLDER AGREEMENT


         AGREEMENT dated November 9, 1999, among Cordiant  Communications  Group
plc,  a company  organized  under the laws of  England  and Wales  ("Cordiant"),
Healthworld Acquisition Corporation,  a Delaware corporation and a direct wholly
owned  subsidiary  of  Cordiant   ("Sub"),   and  The  Girgenti  Family  Limited
Partnership (the "Stockholder").

                              W I T N E S S E T H:

         WHEREAS,   concurrently  herewith,   Cordiant,   Sub,  and  Healthworld
Corporation,  a Delaware  corporation  (the  "Company"),  are  entering  into an
Agreement  and Plan of Merger (as such  agreement  may hereafter be amended from
time to time, the "Merger Agreement"), pursuant to which Sub will be merged with
and into the Company and the Company shall continue as the surviving corporation
(the "Merger");

         Whereas,  the  Stockholder  Beneficially  Owns,  as of the date hereof,
100,000 shares (the "Shares") of common stock,  $.01 par value per share, of the
Company (the "Common Stock"); and

         WHEREAS,  as an inducement  and a condition to entering into the Merger
Agreement,  Cordiant and Sub have required that the Stockholder  agree,  and the
Stockholder has agreed, to enter into this Agreement;

         NOW,  THEREFORE,  in  consideration  of the  foregoing  and the  mutual
premises,  representations,   warranties,  covenants  and  agreements  contained
herein,  the parties  hereto,  intending  to be legally  bound,  hereby agree as
follows:

         1. Definitions. Unless other defined herein, all capitalized terms used
herein shall have the meanings given to such terms in the Merger Agreement.  For
purposes of this Agreement:

                  (a) "Beneficially Own" or "Beneficial  Ownership" with respect
to any securities  shall mean having  "beneficial  ownership" of such securities
(as determined pursuant to Rule 13d-3 under the Securities Exchange Act of 1934,
as  amended  (the  "Exchange  Act")),   including  pursuant  to  any  agreement,
arrangement or understanding, whether or not in writing.

         Without duplicative counting of the same securities by the same holder,
securities  Beneficially Owned by a Person shall include securities Beneficially
Owned by all other  Persons with whom such Person would  constitute a "group" as
within the meanings of Section 13(d)(3) of the Exchange Act.

                  (b) "Exchange Rate" means the average  currency  exchange rate
of pounds  sterling to US dollars based upon the noon buying rate in the City of
New York for cable  transfers in foreign  currencies as announced by the Federal
Reserve Bank of New York for customs  purposes over the 10  consecutive  Trading
Days  ending on the day on which the Stock  Options  are  exercised  pursuant to
Section 3.

                  (c)  "Parent  Share  Value"  shall mean the product of (x) the
average of the closing  middle market  quotation of a Parent Share on the LSE as
reported in the Daily Official List of the London Stock Exchange for each of the
ten  consecutive  Trading Days ending on the day on which the Stock  Options are
exercised pursuant to Section 3 multiplied by (y) Exchange Rate.

                  (d) "Parent  Shares"  shall mean the ordinary  shares,  with a
nominal  value  of U.K.  fifty  pence  each  ("Ordinary  Shares"),  of  Cordiant
(including  any  options or other  rights to receive  Ordinary  Shares)  and the
American Depositary Shares, each representing the right to receive five Ordinary
Shares ("ADSs").

                  (e)   "Person"   shall   mean  an   individual,   corporation,
partnership,  limited  liability  company,  joint venture,  association,  trust,
unincorporated organization or other entity.

                  (f) "Share Value" shall be determined as follows:

                  (i)    if the  Parent Share  Value is equal to or greater than
         $2.5054  and equal to or less than  $3.4838,  the Share  Value shall be
         $20.00;

                  (ii)   if the Parent Share  Value is greater than $3.4838, the
         Share Value  shall be  $23.00; and

                  (iii)  if  the  Parent  Share  Value is less than $2.5054, the
         Share Value shall be $17.00.

                  (g) "Trading Day" shall mean any day on which  securities  are
traded,  with  respect to ADSs,  on the New York Stock  Exchange,  Inc. and with
respect to Ordinary Shares, on the London Stock Exchange Limited.

         2.  Provisions  Concerning  Common  Stock. (a)  The Stockholder  hereby
agrees that during the period  described in clause (b) below,  at any meeting of
the holders of Common Stock of the Company,  however  called,  or in  connection
with any written  consent of the  holders of Common  Stock of the  Company,  the
Stockholder  shall vote (or cause to be voted) the Shares of Common Stock of the
Company,  (i) in favor of the Merger,  the execution and delivery by the Company
of the Merger  Agreement  and the approval of the terms  thereof and each of the
other actions  contemplated  by the Merger  Agreement and this Agreement and any
actions required in furtherance  thereof and hereof;  (ii) against any action or
agreement that would result in a breach in any material respect of any covenant,
representation  or warranty or any other  obligation or agreement of the Company
under the Merger  Agreement  or this  Agreement;  and (iii)  except as otherwise
agreed to in writing  in advance by  Cordiant,  against  the  following  actions
(other  than  the  Merger  and  the  transactions  contemplated  by  the  Merger
Agreement):  (A) any  extraordinary  corporate  transaction,  such as a  merger,
consolidation  or  other  business  combination  involving  the  Company  or its
Subsidiaries;  (B) a sale,  lease or transfer of a material  amount of assets of
the  Company  or  its  Subsidiaries,  or  a  reorganization,   recapitalization,
dissolution or liquidation of the Company or its Subsidiaries; (C) any change in
a majority of the persons who  constitute the board of directors of the Company;
(D) any change in the present  capitalization of the Company or any amendment of
the Company's  Certificate of  Incorporation  or Bylaws;  (E) any other material
change in the Company's corporate structure or business; or (F) any other action
involving the Company or its Subsidiaries which is intended, or could reasonably
be  expected,  to  materially  impede,   interfere  with,  delay,  postpone,  or
materially adversely affect the Merger and the transactions contemplated by this
Agreement and the Merger  Agreement.  The  Stockholder  shall not enter into any
agreement  or  understanding  with any  Person  the  effect  of  which  would be
inconsistent  with or violative of the provisions  and  agreements  contained in
this Section 2.

         (b) The  obligations  of the  Stockholders  under clauses (i), (ii) and
(iii)(C),  (D), (E) and (F) of this Section 2 shall  terminate on the earlier to
occur of the  Effective  Time and the  termination  of the Merger  Agreement  in
accordance  with its terms.  The  obligations  of the  Stockholder  under clause
(iii)(A)  and (B) of this  Section 2 shall  terminate on the earlier to occur of
the Effective Time and 120 days after the termination of the Merger Agreement in
accordance  with its terms (unless the Merger  Agreement is terminated by reason
of the  failure  to  obtain  Parent  Shareholders'  Approval  in which  case the
Stockholder's  obligations  under this Section 2 shall terminate  simultaneously
with the termination of the Merger Agreement).

         3.  Option  to  Purchase.  In order to induce Cordiant and Sub to enter
into the Merger Agreement,  the Stockholder  hereby grants to Sub an irrevocable
option (the "Stock  Options")  to  purchase,  all, and not less than all, of the
Shares at a purchase  price per share equal to the Share Value,  payable in cash
(the  "Purchase  Price"),  solely upon, and subject to, the terms and conditions
set forth below.  The Stock Options may only be exercised if Sub  simultaneously
exercises  all other  options held by it to purchase all, and not less than all,
of the shares of Common Stock covered by such  options.  The Stock Options shall
become  exercisable  solely in the event that the Merger Agreement is terminated
pursuant  to (i)  Section  9.1(b)(ii)  thereof,  but only if the  basis for such
termination  is the failure to obtain the Company  Stockholder  Approval or (ii)
Section  9.1(b)(iii)  thereof,  but only if the basis for such  termination is a
breach by the Company,  or the  Stockholder  materially  breaches any  agreement
contained in this Agreement, in which event the Stock Options shall, in any such
case, become immediately exercisable at any time and from time to time upon such
termination or upon Cordiant and Sub being informed of such breach,  as the case
may be, and until the date  which is 20 days after the date of such  termination
or the date on which  Cordiant and Sub are informed of such breach,  as the case
may be,  provided,  that if at the  expiration  of such 20-day  period the Stock
Options cannot be exercised by reason of any preliminary or final  injunction or
other order issued by any court or  governmental,  administrative  or regulatory
agency or authority  prohibiting  the exercise of the Stock Options  pursuant to
this  Agreement,  or because all  waiting  periods  under the  Hart-Scott-Rodino
Antitrust Improvements Act of 1976, as amended (the "HSR ACT"), required for the
purchase of the Shares upon such exercise shall not have expired or been waived,
the Stock Options shall be exercisable until 10 business days after the later of
the date on which such  impediment to exercise  shall have been removed or shall
have become final and not subject to appeal.  In all other instances,  the Stock
Options shall  terminate upon the  termination of the Merger  Agreement.  In the
event that Cordiant wishes to exercise the Stock Options,  Cordiant shall send a
written notice (the "Notice") to the  Stockholder  identifying  the place (which
shall be in New York City for each  Stockholder  who is a resident of the United
States  and in London  for each  Stockholder  who is a  resident  of the  United
Kingdom) and date (not less than two business days nor greater than ten business
days from the date of the  Notice)  for the  closing of such  purchase.  At such
closing,  Cordiant shall receive  certificates for the Shares, duly endorsed for
transfer,  and shall make  payment  therefor  by wire  transfer  of  immediately
available funds.

         4.  Disposition of Parent Shares.

                  (a)  Restrictions  on  Disposition.   The  Stockholder  hereby
agrees,  except as permitted in this Section 4(a) and Section 4(b) below, not to
directly or indirectly, offer to sell, contract to sell, transfer, assign, cause
to be  redeemed  or  otherwise  sell  or  dispose  of any of the  Parent  Shares
(collectively  a  "Disposition")  received by the stockholder in connection with
the  Merger  without  the prior  written  consent of  Cordiant.  Notwithstanding
anything to the contrary provided in this Agreement,  the Stockholder shall have
the right to  transfer  Parent  Shares  (i) to any  Family  Member,  (ii) to the
trustee or trustees of a trust solely (except for remote  contingent  interests)
for the benefit of the  Stockholder  and/or one or more Family  Members and/or a
charitable organization (a "Family Member Trust"), (iii) to a foundation created
or established by the Stockholder, or any other charitable organization, (iv) to
a  corporation  of which the  Stockholder  and/or any Family  Member  and/or any
Family Member Trust owns all of the outstanding  capital stock, (v) to a limited
liability  company of which the Stockholder  and/or any Family Member and/or any
Family Member Trust owns all of the outstanding membership interests,  (vi) to a
partnership of which the Stockholder  and/or any Family Member and/or any Family
Member  Trust  owns all of the  partnership  interests,  (vii) to the  executor,
administrator or personal representative of the estate of the Stockholder or any
other Family Member, or (viii) to any guardian, trustee or conservator appointed
with respect to the assets of the Stockholder, provided, that in the case of any
such  transfer,  the  transferee  shall  execute an agreement to be bound by the
terms of this  Agreement  (each  such  transfer,  a  "Permitted  Transfer"  and,
collectively,  the  "Permitted  Transfers").  For  purposes  of this  Agreement,
"Family  Member"  shall mean (a) the  Stockholder's  spouse,  if living with the
Stockholder,  (b) any one of the following:  the Stockholder's  father,  mother,
issue,  brother  or sister,  and the issue of a brother  or sister,  and (c) the
spouse of any  Family  Member  described  in (b) above,  if the spouse  shall be
living with that Family Member.  The  Stockholder  hereby agrees and consents to
the entry of stop transfer  instructions with Cordiant's  transfer agent against
the transfer of such Parent  Shares except in  compliance  with this  Agreement.
Notwithstanding  the  foregoing,  the  Stockholder  may pledge,  hypothecate  or
otherwise  grant a security  interest  in all or a portion of the Parent  Shares
beneficially owned by him during the term of this Agreement;  provided, however,
that any Person  receiving  such  Parent  Shares  shall be subject to all of the
restrictions  on  Disposition of such Parent Shares imposed by this Agreement to
the same extent as the Stockholder.

                  (b) Permitted Dispositions. The Stockholder may not effect any
Disposition of Parent Shares  received by the Stockholder in connection with the
Merger  except as  follows:  (i)  during  the  twelve-month  period  immediately
following the Effective Time the  Stockholder  may effect the Disposition of not
more than 10% of the Parent Shares  Beneficially  Owned by the  Stockholder  and
(ii) during the  twenty-four-month  period  immediately  following the Effective
Time (the "Period"), the Stockholder may effect the Disposition of not more than
50% of the  Parent  Shares  Beneficially  Owned  by the  Stockholder.  Upon  the
expiration of the Period,  the Stockholder may effect the Dispositions of all or
any  portion  of the  Parent  Shares  Beneficially  Owned by him  subject to any
applicable  restrictions  under the Federal  Securities Law and  restrictions of
general  application  under  English law, the Listing  Rules of the London Stock
Exchange,  if applicable,  and  Cordiant's  policies made pursuant to such rules
regarding  dealings in Parent  Shares by  directors  and  relevant  employees of
Cordiant and its subsidiaries,  if applicable.  Notwithstanding  anything to the
contrary contained in this Section 4, the Stockholder hereby agrees that for the
period commencing at the Effective Time and ending on the date which is 180 days
after the  expiration  of the  Period,  the  Stockholder  shall give  Cordiant 1
business day prior written  notice of any intended  Disposition of Parent Shares
to be made by the  Stockholder  and at the request of Cordiant  agrees to effect
such Disposition through brokers or other financial intermediaries designated by
Cordiant to maintain an orderly  trading market for the Parent Shares,  provided
that  such  financial   intermediary  agrees  to  effect  and  does  effect  the
Disposition in a reasonable period following such notice.

         5.  Representations  and Warranties of the Stockholder. The Stockholder
hereby represents and warrants to each of Cordiant and Sub as follows:

                  (a) Ownership of Shares.  The Stockholder is the record holder
of or Beneficially  Owns the Shares.  On the date hereof,  the Shares constitute
all of the shares of Common Stock owned of record or  Beneficially  Owned by the
Stockholder  (excluding  any Stock Options (as defined in the Merger  Agreement)
held by the  Stockholder).  The Stockholder has sole voting power and sole power
to issue instructions with respect to the matters set forth in Section 2 hereof,
sole power of  disposition,  sole power of  conversion,  sole power to  exercise
dissenters'  rights and sole power to agree to all of the  matters  set forth in
this  agreement,  in  each  case  with  respect  to all of the  Shares,  with no
limitations,   qualifications  or  restrictions  on  such  rights,   subject  to
applicable securities laws and the terms of this Agreement.

                  (b) Power;  Binding  Agreement.  The Stockholder has the legal
capacity,  power and authority to enter into and perform all of his  obligations
under this Agreement. The execution,  delivery and performance of this Agreement
by the Stockholder will not violate any other Agreement to which the Stockholder
is a party including,  without  limitation,  any voting agreement,  shareholders
agreement or voting trust. This Agreement has been duly and validly executed and
delivered by the Stockholder  and  constitutes a valid and binding  agreement of
the  Stockholder,  enforceable  against the  Stockholder in accordance  with its
terms  except  that  such  enforceability  (i)  may be  limited  by  bankruptcy,
insolvency,  moratorium  or other similar laws  relating to the  enforcement  of
creditors' rights generally and (ii) is subject to general  principles of equity
and  discretion  of the court before which any  proceedings  seeking  injunctive
relief or specific  performance may be sought. There is no beneficiary or holder
of a voting  trust  certificate  or other  interest  of any  trust of which  the
Stockholder  is trustee whose consent is required for the execution and delivery
of this agreement or the  consummation  by the  Stockholder of the  transactions
contemplated  hereby. If the Stockholder is married and the Stockholder's Shares
constitute community property, this agreement has been duly authorized, executed
and  delivered  by,  and  constitutes  a valid and  binding  agreement  of,  the
Stockholder's  spouse,  enforceable  against such Person in accordance  with its
terms  except  that  such  enforceability  (i)  may be  limited  by  bankruptcy,
insolvency,  moratorium  or other similar laws  relating to the  enforcement  of
creditors' rights generally and (ii) is subject to general  principles of equity
and  discretion  of the court before which any  proceedings  seeking  injunctive
relief or specific performance may be sought.

                  (c) No Conflicts. Except for filings, permits, authorizations,
consents and  approvals  under the HSR Act and the  Securities  Act of 1933,  if
applicable,  (A) no  filing  with,  and no  permit,  authorization,  consent  or
approval of, any state or federal  public body or authority is necessary for the
execution  of this  Agreement by the  Stockholder  and the  consummation  by the
Stockholder  of  the  transactions  contemplated  hereby  and  (B)  none  of the
execution and delivery of this Agreement by the Stockholder, the consummation by
the  Stockholder of the  transactions  contemplated  hereby or compliance by the
Stockholder with any of the provisions  hereof shall, in a manner which would be
material  and  adverse  to the  ability of the  Stockholder  to  consummate  the
transactions contemplated hereby or to comply with the terms hereof, result in a
violation or breach of, or constitute  (with or without  notice or lapse of time
or both) a  default  (or give  rise to any  third  party  right of  termination,
cancellation,  material  modification or  acceleration)  under any of the terms,
conditions  or  provisions  of any note,  bond,  mortgage,  indenture,  license,
contract, commitment, arrangement,  understanding, agreement or other instrument
or  obligation of any kind to which the  Stockholder  is a party or by which the
Stockholder or any of the  Stockholder's  properties or assets may be bound,  or
(3) violate any order, writ, injunction,  decree, judgment, order, statute, rule
or  regulation  applicable  to the  Stockholder  or  any  of  the  Stockholder's
properties or assets.

                  (d) No  Encumbrances.  Except as applicable in connection with
the  transactions  contemplated  hereby or as set forth on  Schedule  B attached
hereto, the Shares and the certificates  representing the Shares are now, and at
all times  during the term  hereof  will be,  held by the  Stockholder,  or by a
nominee or custodian for the benefit of the  Stockholder,  free and clear of all
liens,  claims,  security  interests,  proxies,  voting  trusts  or  agreements,
understandings or arrangements or any other encumbrances whatsoever,  except for
any such encumbrances or proxies arising hereunder in favor of Cordiant.

                  (e) No Finder's Fees. No broker,  investment banker, financial
adviser  or other  person  is  entitled  to any  broker's,  finder's,  financial
adviser's or other similar fee or commission in connection with the transactions
contemplated  hereby  based  upon  arrangements  made  by or on  behalf  of  the
Stockholder  other than Bear Stearns & Co. Inc.,  the fees and expenses of which
shall be paid by the Company.

                  (f) Reliance by Cordiant and Sub. The Stockholder  understands
and acknowledges that Cordiant and Sub are entering into the Merger Agreement in
reliance upon the Stockholder's execution and delivery of this Agreement.

         6.  Additional  Covenants  of  the Stockholder.  The Stockholder hereby
covenants to each of Cordiant and Sub as follows:

                  (a) No  Solicitation.  Subject to the provisions  contained in
Section 10 of this  Agreement,  the  Stockholder  shall not, in his  capacity as
such,   directly  or  indirectly,   solicit  (including  by  way  of  furnishing
information)  or respond to any  inquiries  or the making of any proposal by any
Person or entity (other than Cordiant or any affiliate of Cordiant) with respect
to the Company that constitutes a Takeover Proposal. If the Stockholder receives
any such  inquiry  or  proposal,  then the  Stockholder  shall  promptly  inform
Cordiant of the existence  thereof.  The Stockholder will immediately  cease and
cause to be terminated any existing activities, discussions or negotiations with
any parties conducted heretofore with respect to any of the foregoing.

                  (b)   Restriction   on   Transfer   of  Shares,   Proxies  and
Non-Interference.  Beginning on the date hereof and ending on the later to occur
of (A) last date the Stock Options are exercisable  pursuant to Section 3 hereof
and (B) the date that all of the Stockholder's  obligations under Section 2 have
terminated, except as contemplated by this Agreement or the Merger Agreement, no
Stockholder shall,  directly or indirectly,  (i) offer for sale, sell, transfer,
tender,  pledge,  encumber,  assign or  otherwise  dispose of, or enter into any
contract,  option or other  arrangement  or  understanding  with  respect  to or
consent to the offer for sale,  sale,  transfer,  tender,  pledge,  encumbrance,
assignment  or other  disposition  of, any or all of the Shares or any  interest
therein;  (ii) except as contemplated  by this  Agreement,  grant any proxies or
powers of attorney,  deposit any of the Shares into a voting trust or enter into
a voting  agreement with respect to any of the Shares;  or (iii) take any action
that would make any  representation  or  warranty of the  Stockholder  contained
herein  untrue or incorrect or have the effect of  preventing  or disabling  the
Stockholder from performing the Stockholder's  obligations under this Agreement.
Notwithstanding   anything  to  the  contrary  provided  in  this  Agreement,  a
Stockholder  shall have the right to make  Permitted  Transfers  of Shares.  The
Stockholder agrees with, and covenants to, Sub that beginning on the date hereof
and  ending on the last date the  Stock  Options  are  exercisable  pursuant  to
Section 3 hereof,  the Stockholder  shall not request that the Company  register
the transfer  (book-entry  or otherwise) of any  certificate  or  uncertificated
interest  representing  any of the  Shares,  unless  such  transfer  is  made in
compliance with this Agreement (including the provisions of Section 2 hereof).

                  (c) Additional  Shares.  The  Stockholder  agrees,  while this
Agreement is in effect (i) to notify  Cordiant and Sub promptly of the number of
any shares of Common  Stock  acquired by the  Stockholder  after the date hereof
(the "Additional  Shares") and (ii) to vote such Additional Shares in accordance
with Section 2 hereof. Such Additional Shares shall also be subject to the Stock
Option granted to Sub pursuant to Section 3 hereof and the restriction contained
in Section 6(b)(i) and (ii) above.

         7.  Representations  and  Warranties  of Cordiant and Sub. Cordiant and
Sub hereby  covenant,  represent  and  warrant to the  Stockholder  that each of
Cordiant and Sub has the legal  capacity,  power and authority to enter into and
perform all of such party's  obligations  under this  Agreement;  the execution,
delivery and  performance of this Agreement by Cordiant and Sub will not violate
or result in a breach of any other  material  agreement to which Cordiant or Sub
is a party; the execution and delivery of this Agreement and the consummation of
the transactions  contemplated hereby (i) have been duly authorized by the board
of  directors  of  Cordiant  and Sub,  and (ii) do not and will not  violate any
provision of the certificate of incorporation or by-laws of Cordiant or Sub; and
this  Agreement  has been duly and validly  executed  and  delivered  by each of
Cordiant and Sub and  constitutes  a valid and binding  agreement of such party,
enforceable against such party in accordance with its terms.

         8.  Further  Assurances.  From  time  to  time,  at the  other  party's
request and without further  consideration,  each party hereto shall execute and
deliver  such  additional   reasonable  documents  and  take  all  such  further
reasonable lawful action as may be necessary or desirable to consummate and make
effective,  in  the  most  expeditious  manner  practicable,   the  transactions
contemplated by this Agreement.

         9.  Termination;  Expenses  and  Fee. (a) The covenants and  agreements
contained herein with respect to the Shares shall terminate (i) in the event the
Merger  Agreement  is  terminated  in  accordance  with  its  terms,  upon  such
termination,  except that the  provisions of Sections 2, 3 and 6(b) hereof shall
survive any such  termination  solely in accordance with their terms and (ii) in
the event the Merger is  consummated,  at the  Effective  Time,  except that the
provisions of Section 4 hereof shall survive any such termination,  provided, in
each case, that the provisions of Section 12 and Section 13 hereof shall survive
any termination of this Agreement, and provided, further, that no termination of
this Agreement shall relieve any party of liability for a breach hereof.

        (b) Each  party shall bear its own  expenses  in  connection  with  this
Agreement and the transactions contemplated hereby.

         10.  Stockholder  Capacity.  The  Stockholder  is not  executing  this
Agreement and does not make any agreement or understanding  herein in his or her
capacity as a director or officer of the  Company and nothing  contained  herein
shall limit or affect any actions taken by the  Stockholder in his capacity as a
director or officer of the Company to the extent such action is permitted by, or
not  prohibited  by,  the  Merger  Agreement,  and none of such  actions in such
capacities  shall be  deemed  to  constitute  a breach  of this  Agreement.  The
Stockholder  signs solely in his capacity as the record and beneficial owner of,
or the trustee of a trust whose  beneficiaries are the beneficial owners of, the
Shares.

         11.   Sophistication.  The  Stockholder  acknowledges  that  he  is  an
informed  and  sophisticated  investor  and,  together  with his  advisors,  has
undertaken  such  investigation  as they have deemed  necessary,  including  the
review of the Merger Agreement and this Agreement,  to enable the Stockholder to
make an informed and intelligent  decision with respect to the Merger  Agreement
and this Agreement and the transactions contemplated thereby and hereby.

         12.   Confidentiality.  Each  of the  parties  hereto  recognizes  that
successful  consummation of the transactions  contemplated by this Agreement may
be  dependent  upon  confidentiality  with  respect to the  matters  referred to
herein. In this connection, pending public disclosure thereof, each party hereby
agrees not to disclose or discuss  such  matters with anyone not a party to this
Agreement or the Merger Agreement (other than such party's counsel and advisors,
if any) without the prior written consent of the other party, except for filings
required  pursuant to the Exchange Act and the rules and regulations  thereunder
or disclosures  such party's  counsel  advises are necessary in order to fulfill
such  party's  obligations  imposed by law, in which event such party shall give
notice of such disclosure to the other party as promptly as practicable so as to
enable the other  party to seek a  protective  order  from a court of  competent
jurisdiction with respect thereto.

         13.  Miscellaneous.

                  (a) Entire Agreement.  This Agreement and the Merger Agreement
constitute the entire agreement  between the parties with respect to the subject
matter hereof and supersede all other prior agreements and understandings,  both
written and oral, between the parties with respect to the subject matter hereof.

                  (b) Certain Events. The Stockholder agrees that this Agreement
and the obligations hereunder shall attach to the Stockholder's Shares and shall
be binding upon any person or entity to which legal or  beneficial  ownership of
such Shares shall pass,  whether by operation  of law or  otherwise,  including,
without  limitation,  the  Stockholder's  heirs,  guardians,  administrators  or
successors,  provided,  that following the Effective  Time, this Agreement shall
not be binding on any  purchaser of Shares in a  transaction  made in compliance
with Section 4(b), other than Permitted Transfers.  Notwithstanding any transfer
of  Shares,  the  transferor  shall  remain  liable for the  performance  of all
obligations under this Agreement of the transferor.

                  (c) Change in Control.  In the event that after the  Effective
Time (i) any Person or group of Persons  acting in  concert  (as  defined in the
City Code on Take-overs and Mergers in the United Kingdom)  acquires an interest
in the equity share capital of Cordiant (an "Acquiring Person") and, immediately
following such  acquisition,  such person,  or group,  holds shares  entitled to
exercise  more than 50% of the votes  which may be cast at a general  meeting of
Cordiant or (ii) a majority of the board of  directors  of Cordiant  immediately
prior  to  such  Person  becoming  an  Acquiring  Person,  cease  to  thereafter
constitute a majority of the board of directors of Cordiant  (other than through
elections of directors  whose  nomination  for election by the  shareholders  of
Cordiant  were  approved by the vote of a majority of  directors of Cordiant who
were either  directors prior to a Person  becoming an Acquiring  Person or whose
election or  nomination  for  election  was so  previously  approved),  then the
restrictions on Dispositions contained in Section 4, shall terminate without any
action on the part of any party hereto.

                  (d)  Assignment.  This  Agreement  shall  not be  assigned  by
operation of law or  otherwise  without the prior  written  consent of the other
party,  provided,  that Cordiant or Sub may assign, in its sole discretion,  its
rights  and  obligations  hereunder  to any  direct  or  indirect  wholly  owned
subsidiary of Cordiant,  but no such assignment shall relieve Cordiant or Sub of
its  obligations  hereunder  if such  assignee  does not or cannot  perform such
obligations.

                  (e)  Amendments,  Waivers,  Etc.  This  Agreement  may  not be
amended,  changed,  supplemented,  waived or otherwise  modified or  terminated,
except upon the  execution and delivery of a written  agreement  executed by the
party to be charged  thereby  or,  with  respect to  termination,  as  otherwise
provided herein.

                  (f) Notices. All notices,  requests, claims, demands and other
communications  hereunder  shall be in writing  and shall be given (and shall be
deemed to have been duly received if so given) by hand delivery, telegram, telex
or telecopy,  or by mail (registered or certified mail, postage prepaid,  return
receipt requested) or by any courier service, such as Federal Express, providing
proof of  delivery.  All  communications  hereunder  shall be  delivered  to the
respective parties at the following addresses:

         If to the Stockholder:     The Girgenti Family Limited Partnership
                                    c/o Healthworld Corporation
                                    100 Avenue of the Americas
                                    New York, New York 10010
                                    Attention: Steven Girgenti
                                    Facsimile: (212) 966-2743

         and

         If to Cordiant or
         Sub to:                    Cordiant Communications Group plc
                                    121-141 Westbourne Terrace
                                    London W2 6JR
                                    Attention:  Deputy Finance Director
                                    Facsimile:  +44-171-262-4300

         copy to:                   White & Case LLP
                                    1155 Avenue of the Americas
                                    New York, New York  10036-2787
                                    Attention:  Timothy B. Goodell, Esq.
                                    Facsimile:  (212) 354-8113

or to such  other  address  as the  person  to whom  notice  is  given  may have
previously furnished to the others in writing in the manner set forth above.

                  (g) Severability. Whenever possible, each provision or portion
of any provision of this  Agreement  will be interpreted in such manner as to be
effective and valid under  applicable law but if any provision or portion of any
provision of this Agreement is held to be invalid,  illegal or  unenforceable in
any  respect  under  any  applicable  law  or  rule  in any  jurisdiction,  such
invalidity,  illegality or unenforceability  will not affect any other provision
or portion of any provision in such  jurisdiction,  and this  Agreement  will be
reformed,  construed  and  enforced  in such  jurisdiction  as if such  invalid,
illegal or  unenforceable  provision or portion of any  provision had never been
contained herein.

                  (h)  Specific   Performance.   Each  of  the  parties   hereto
recognizes and  acknowledges  that a breach by it of any covenants or agreements
contained in this  Agreement will cause the aggrieved  party to sustain  damages
for which it would not have an  adequate  remedy at law for money  damages,  and
therefore each of the parties hereto agrees that in the event of any such breach
the aggrieved  party shall be entitled to the remedy of specific  performance of
such  covenants and agreements  and  injunctive  and other  equitable  relief in
addition to any other remedy to which it may be entitled, at law or in equity.

                  (i)  Remedies  Cumulative.  All  rights,  powers and  remedies
provided under this Agreement or otherwise available in respect hereof at law or
in equity  shall be  cumulative  and not  alternative,  and the  exercise of any
thereof by any party shall not preclude the  simultaneous  or later  exercise of
any other such right, power or remedy by such party.

                  (j) No Waiver. The failure of any party hereto to exercise any
right,  power or remedy provided under this Agreement or otherwise  available in
respect  hereof at law or in equity,  or to insist upon  compliance by any other
party hereto with its obligations  hereunder,  and any custom or practice of the
parties at variance with the terms hereof, shall not constitute a waiver by such
party of its right to exercise  any such or other  right,  power or remedy or to
demand such compliance.

                  (k)  No  Third  Party  Beneficiaries.  This  Agreement  is not
intended to be for the benefit of, and shall not be  enforceable  by, any person
or entity who or which is not a party hereto.

                  (l)  Governing  Law.  This  Agreement  shall be  governed  and
construed in accordance  with the laws of the State of New York,  without giving
effect to the principles of conflicts of law thereof.

                  (m) Jurisdiction. Each party hereby irrevocably submits to the
exclusive  jurisdiction of the Court of Chancery in the State of Delaware or the
United States District Court for the Southern  District of New York or any court
of the State of New York located in the City of New York in any action,  suit or
proceeding  arising in connection with this Agreement,  and agrees that any such
action,  suit or proceeding  shall be brought only in such court (and waives any
objection  based  on  forum  non  conveniens  or any  other  objection  to venue
therein); provided, however, that such consent to jurisdiction is solely for the
purpose  referred  to in this  paragraph  (1) and  shall  not be  deemed to be a
general  submission  to the  jurisdiction  of said  Courts  or in the  States of
Delaware  or New York other than for such  purposes.  Each party  hereto  hereby
waives any right to a trial by jury in connection with any such action,  suit or
proceeding.

                  (n) Descriptive Headings. The descriptive headings used herein
are inserted for  convenience  of reference only and are not intended to be part
of or to affect the meaning or interpretation of this Agreement.

                  (o)   Counterparts.   This   Agreement   may  be  executed  in
counterparts, each of which shall be deemed to be an original, but all of which,
taken together, shall constitute one and the same Agreement.


                         [SIGNATURES BEGIN ON NEXT PAGE]




<PAGE>


         IN WITNESS WHEREOF,  Cordiant, Sub and the Stockholder have caused this
Agreement to be duly executed as of the day and year first above written.


                                        CORDIANT COMMUNICATIONS GROUP PLC


                                        By: /s/ Arthur D'Angelo
                                            -----------------------------
                                            Name:  Arthur D'Angelo
                                            Title: Finance Director



                                        HEALTHWORLD ACQUISITION CORP.


                                        By: /s/ Arthur D'Angelo
                                            -----------------------------
                                            Name:  Arthur D'Angelo
                                            Title: President




                                        THE GIRGENTI FAMILY LIMITED PARTNERSHIP


                                        By:  /s/ Steven Girgenti
                                             ----------------------------
                                             Name:  Steven Girgenti
                                             Title: General Partner



<PAGE>


                     Schedule B to Stockholder Agreement of
                    The Girgenti Family Limited Partnership



No exceptions.





                                                                      EXHIBIT 12


                              STOCKHOLDER AGREEMENT


         AGREEMENT dated November 9, 1999, among Cordiant  Communications  Group
plc,  a company  organized  under the laws of  England  and Wales  ("Cordiant"),
Healthworld Acquisition Corporation,  a Delaware corporation and a direct wholly
owned  subsidiary of Cordiant  ("Sub"),  and The Steve Girgenti  Charitable Lead
Annuity Trust (the "Stockholder").

                              W I T N E S S E T H:

         WHEREAS,   concurrently  herewith,   Cordiant,   Sub,  and  Healthworld
Corporation,  a Delaware  corporation  (the  "Company"),  are  entering  into an
Agreement  and Plan of Merger (as such  agreement  may hereafter be amended from
time to time, the "Merger Agreement"), pursuant to which Sub will be merged with
and into the Company and the Company shall continue as the surviving corporation
(the "Merger");

         Whereas,  the  Stockholder  Beneficially  Owns,  as of the date hereof,
66,666 shares (the "Shares") of common stock,  $.01 par value per share,  of the
Company (the "Common Stock"); and

         WHEREAS,  as an inducement  and a condition to entering into the Merger
Agreement,  Cordiant and Sub have required that the Stockholder  agree,  and the
Stockholder has agreed, to enter into this Agreement;

         NOW,  THEREFORE,  in  consideration  of the  foregoing  and the  mutual
premises,  representations,   warranties,  covenants  and  agreements  contained
herein,  the parties  hereto,  intending  to be legally  bound,  hereby agree as
follows:

         1. Definitions. Unless other defined herein, all capitalized terms used
herein shall have the meanings given to such terms in the Merger Agreement.  For
purposes of this Agreement:

                  (a) "Beneficially Own" or "Beneficial  Ownership" with respect
to any securities  shall mean having  "beneficial  ownership" of such securities
(as determined pursuant to Rule 13d-3 under the Securities Exchange Act of 1934,
as  amended  (the  "Exchange  Act")),   including  pursuant  to  any  agreement,
arrangement or understanding, whether or not in writing.

         Without duplicative counting of the same securities by the same holder,
securities  Beneficially Owned by a Person shall include securities Beneficially
Owned by all other  Persons with whom such Person would  constitute a "group" as
within the meanings of Section 13(d)(3) of the Exchange Act.

                  (b) "Exchange Rate" means the average  currency  exchange rate
of pounds  sterling to US dollars based upon the noon buying rate in the City of
New York for cable  transfers in foreign  currencies as announced by the Federal
Reserve Bank of New York for customs  purposes over the 10  consecutive  Trading
Days  ending on the day on which the Stock  Options  are  exercised  pursuant to
Section 3.

                  (c)  "Parent  Share  Value"  shall mean the product of (x) the
average of the closing  middle market  quotation of a Parent Share on the LSE as
reported in the Daily Official List of the London Stock Exchange for each of the
ten  consecutive  Trading Days ending on the day on which the Stock  Options are
exercised pursuant to Section 3 multiplied by (y) Exchange Rate.

                  (d) "Parent  Shares"  shall mean the ordinary  shares,  with a
nominal  value  of U.K.  fifty  pence  each  ("Ordinary  Shares"),  of  Cordiant
(including  any  options or other  rights to receive  Ordinary  Shares)  and the
American Depositary Shares, each representing the right to receive five Ordinary
Shares ("ADSs").

                  (e)   "Person"   shall   mean  an   individual,   corporation,
partnership,  limited  liability  company,  joint venture,  association,  trust,
unincorporated organization or other entity.

                  (f) "Share Value" shall be determined as follows:

                  (i)   if the Parent Share  Value is equal to or  greater  than
         $2.5054  and equal to or less than  $3.4838,  the Share  Value shall be
         $20.00;

                  (ii)  if  the  Parent Share Value is greater than $3.4838, the
         Share Value  shall be  $23.00; and

                  (iii) if  the  Parent Share  Value  is less  than $2.5054, the
         Share Value shall be $17.00

                  (g) "Trading Day" shall mean any day on which  securities  are
traded,  with  respect to ADSs,  on the New York Stock  Exchange,  Inc. and with
respect to Ordinary Shares, on the London Stock Exchange Limited.

         2.  Provisions   Concerning   Common Stock. (a) The Stockholder  hereby
agrees that during the period  described in clause (b) below,  at any meeting of
the holders of Common Stock of the Company,  however  called,  or in  connection
with any written  consent of the  holders of Common  Stock of the  Company,  the
Stockholder  shall vote (or cause to be voted) the Shares of Common Stock of the
Company,  (i) in favor of the Merger,  the execution and delivery by the Company
of the Merger  Agreement  and the approval of the terms  thereof and each of the
other actions  contemplated  by the Merger  Agreement and this Agreement and any
actions required in furtherance  thereof and hereof;  (ii) against any action or
agreement that would result in a breach in any material respect of any covenant,
representation  or warranty or any other  obligation or agreement of the Company
under the Merger  Agreement  or this  Agreement;  and (iii)  except as otherwise
agreed to in writing  in advance by  Cordiant,  against  the  following  actions
(other  than  the  Merger  and  the  transactions  contemplated  by  the  Merger
Agreement):  (A) any  extraordinary  corporate  transaction,  such as a  merger,
consolidation  or  other  business  combination  involving  the  Company  or its
Subsidiaries;  (B) a sale,  lease or transfer of a material  amount of assets of
the  Company  or  its  Subsidiaries,  or  a  reorganization,   recapitalization,
dissolution or liquidation of the Company or its Subsidiaries; (C) any change in
a majority of the persons who  constitute the board of directors of the Company;
(D) any change in the present  capitalization of the Company or any amendment of
the Company's  Certificate of  Incorporation  or Bylaws;  (E) any other material
change in the Company's corporate structure or business; or (F) any other action
involving the Company or its Subsidiaries which is intended, or could reasonably
be  expected,  to  materially  impede,   interfere  with,  delay,  postpone,  or
materially adversely affect the Merger and the transactions contemplated by this
Agreement and the Merger  Agreement.  The  Stockholder  shall not enter into any
agreement  or  understanding  with any  Person  the  effect  of  which  would be
inconsistent  with or violative of the provisions  and  agreements  contained in
this Section 2.

         (b) The  obligations  of the  Stockholders  under clauses (i), (ii) and
(iii)(C),  (D), (E) and (F) of this Section 2 shall  terminate on the earlier to
occur of the  Effective  Time and the  termination  of the Merger  Agreement  in
accordance  with its terms.  The  obligations  of the  Stockholder  under clause
(iii)(A)  and (B) of this  Section 2 shall  terminate on the earlier to occur of
the Effective Time and 120 days after the termination of the Merger Agreement in
accordance  with its terms (unless the Merger  Agreement is terminated by reason
of the  failure  to  obtain  Parent  Shareholders'  Approval  in which  case the
Stockholder's  obligations  under this Section 2 shall terminate  simultaneously
with the termination of the Merger Agreement).

         3.  Option  to  Purchase.  In order to induce Cordiant and Sub to enter
into the Merger Agreement,  the Stockholder  hereby grants to Sub an irrevocable
option (the "Stock  Options")  to  purchase,  all, and not less than all, of the
Shares at a purchase  price per share equal to the Share Value,  payable in cash
(the  "Purchase  Price"),  solely upon, and subject to, the terms and conditions
set forth below.  The Stock Options may only be exercised if Sub  simultaneously
exercises  all other  options held by it to purchase all, and not less than all,
of the shares of Common Stock covered by such  options.  The Stock Options shall
become  exercisable  solely in the event that the Merger Agreement is terminated
pursuant  to (i)  Section  9.1(b)(ii)  thereof,  but only if the  basis for such
termination  is the failure to obtain the Company  Stockholder  Approval or (ii)
Section  9.1(b)(iii)  thereof,  but only if the basis for such  termination is a
breach by the Company,  or the  Stockholder  materially  breaches any  agreement
contained in this Agreement, in which event the Stock Options shall, in any such
case, become immediately exercisable at any time and from time to time upon such
termination or upon Cordiant and Sub being informed of such breach,  as the case
may be, and until the date  which is 20 days after the date of such  termination
or the date on which  Cordiant and Sub are informed of such breach,  as the case
may be,  provided,  that if at the  expiration  of such 20-day  period the Stock
Options cannot be exercised by reason of any preliminary or final  injunction or
other order issued by any court or  governmental,  administrative  or regulatory
agency or authority  prohibiting  the exercise of the Stock Options  pursuant to
this  Agreement,  or because all  waiting  periods  under the  Hart-Scott-Rodino
Antitrust Improvements Act of 1976, as amended (the "HSR ACT"), required for the
purchase of the Shares upon such exercise shall not have expired or been waived,
the Stock Options shall be exercisable until 10 business days after the later of
the date on which such  impediment to exercise  shall have been removed or shall
have become final and not subject to appeal.  In all other instances,  the Stock
Options shall  terminate upon the  termination of the Merger  Agreement.  In the
event that Cordiant wishes to exercise the Stock Options,  Cordiant shall send a
written notice (the "Notice") to the  Stockholder  identifying  the place (which
shall be in New York City for each  Stockholder  who is a resident of the United
States  and in London  for each  Stockholder  who is a  resident  of the  United
Kingdom) and date (not less than two business days nor greater than ten business
days from the date of the  Notice)  for the  closing of such  purchase.  At such
closing,  Cordiant shall receive  certificates for the Shares, duly endorsed for
transfer,  and shall make  payment  therefor  by wire  transfer  of  immediately
available funds.

         4.  Disposition of Parent Shares.

                  (a)  Restrictions  on  Disposition.   The  Stockholder  hereby
agrees,  except as permitted in this Section 4(a) and Section 4(b) below, not to
directly or indirectly, offer to sell, contract to sell, transfer, assign, cause
to be  redeemed  or  otherwise  sell  or  dispose  of any of the  Parent  Shares
(collectively  a  "Disposition")  received by the stockholder in connection with
the  Merger  without  the prior  written  consent of  Cordiant.  Notwithstanding
anything to the contrary provided in this Agreement,  the Stockholder shall have
the right to  transfer  Parent  Shares  (i) to any  Family  Member,  (ii) to the
trustee or trustees of a trust solely (except for remote  contingent  interests)
for the benefit of the  Stockholder  and/or one or more Family  Members and/or a
charitable organization (a "Family Member Trust"), (iii) to a foundation created
or established by the Stockholder, or any other charitable organization, (iv) to
a  corporation  of which the  Stockholder  and/or any Family  Member  and/or any
Family Member Trust owns all of the outstanding  capital stock, (v) to a limited
liability  company of which the Stockholder  and/or any Family Member and/or any
Family Member Trust owns all of the outstanding membership interests,  (vi) to a
partnership of which the Stockholder  and/or any Family Member and/or any Family
Member  Trust  owns all of the  partnership  interests,  (vii) to the  executor,
administrator or personal representative of the estate of the Stockholder or any
other Family Member, or (viii) to any guardian, trustee or conservator appointed
with respect to the assets of the Stockholder, provided, that in the case of any
such  transfer,  the  transferee  shall  execute an agreement to be bound by the
terms of this  Agreement  (each  such  transfer,  a  "Permitted  Transfer"  and,
collectively,  the  "Permitted  Transfers").  For  purposes  of this  Agreement,
"Family  Member"  shall mean (a) the  Stockholder's  spouse,  if living with the
Stockholder,  (b) any one of the following:  the Stockholder's  father,  mother,
issue,  brother  or sister,  and the issue of a brother  or sister,  and (c) the
spouse of any  Family  Member  described  in (b) above,  if the spouse  shall be
living with that Family Member.  The  Stockholder  hereby agrees and consents to
the entry of stop transfer  instructions with Cordiant's  transfer agent against
the transfer of such Parent  Shares except in  compliance  with this  Agreement.
Notwithstanding  the  foregoing,  the  Stockholder  may pledge,  hypothecate  or
otherwise  grant a security  interest  in all or a portion of the Parent  Shares
beneficially owned by him during the term of this Agreement;  provided, however,
that any Person  receiving  such  Parent  Shares  shall be subject to all of the
restrictions  on  Disposition of such Parent Shares imposed by this Agreement to
the same extent as the Stockholder.

                  (b) Permitted Dispositions. The Stockholder may not effect any
Disposition of Parent Shares  received by the Stockholder in connection with the
Merger  except as  follows:  (i)  during  the  twelve-month  period  immediately
following the Effective Time the  Stockholder  may effect the Disposition of not
more than 10% of the Parent Shares  Beneficially  Owned by the  Stockholder  and
(ii) during the  twenty-four-month  period  immediately  following the Effective
Time (the "Period"), the Stockholder may effect the Disposition of not more than
50% of the  Parent  Shares  Beneficially  Owned  by the  Stockholder.  Upon  the
expiration of the Period,  the Stockholder may effect the Dispositions of all or
any  portion  of the  Parent  Shares  Beneficially  Owned by him  subject to any
applicable  restrictions  under the Federal  Securities Law and  restrictions of
general  application  under  English law, the Listing  Rules of the London Stock
Exchange,  if applicable,  and  Cordiant's  policies made pursuant to such rules
regarding  dealings in Parent  Shares by  directors  and  relevant  employees of
Cordiant and its subsidiaries,  if applicable.  Notwithstanding  anything to the
contrary contained in this Section 4, the Stockholder hereby agrees that for the
period commencing at the Effective Time and ending on the date which is 180 days
after the  expiration  of the  Period,  the  Stockholder  shall give  Cordiant 1
business day prior written  notice of any intended  Disposition of Parent Shares
to be made by the  Stockholder  and at the request of Cordiant  agrees to effect
such Disposition through brokers or other financial intermediaries designated by
Cordiant to maintain an orderly  trading market for the Parent Shares,  provided
that  such  financial   intermediary  agrees  to  effect  and  does  effect  the
Disposition in a reasonable period following such notice.

         5.  Representations and  Warranties of the Stockholder. The Stockholder
hereby represents and warrants to each of Cordiant and Sub as follows:

                  (a) Ownership of Shares.  The Stockholder is the record holder
of or Beneficially  Owns the Shares.  On the date hereof,  the Shares constitute
all of the shares of Common Stock owned of record or  Beneficially  Owned by the
Stockholder  (excluding  any Stock Options (as defined in the Merger  Agreement)
held by the  Stockholder).  The Stockholder has sole voting power and sole power
to issue instructions with respect to the matters set forth in Section 2 hereof,
sole power of  disposition,  sole power of  conversion,  sole power to  exercise
dissenters'  rights and sole power to agree to all of the  matters  set forth in
this  agreement,  in  each  case  with  respect  to all of the  Shares,  with no
limitations,   qualifications  or  restrictions  on  such  rights,   subject  to
applicable securities laws and the terms of this Agreement.

                  (b) Power;  Binding  Agreement.  The Stockholder has the legal
capacity,  power and authority to enter into and perform all of his  obligations
under this Agreement. The execution,  delivery and performance of this Agreement
by the Stockholder will not violate any other Agreement to which the Stockholder
is a party including,  without  limitation,  any voting agreement,  shareholders
agreement or voting trust. This Agreement has been duly and validly executed and
delivered by the Stockholder  and  constitutes a valid and binding  agreement of
the  Stockholder,  enforceable  against the  Stockholder in accordance  with its
terms  except  that  such  enforceability  (i)  may be  limited  by  bankruptcy,
insolvency,  moratorium  or other similar laws  relating to the  enforcement  of
creditors' rights generally and (ii) is subject to general  principles of equity
and  discretion  of the court before which any  proceedings  seeking  injunctive
relief or specific  performance may be sought. There is no beneficiary or holder
of a voting  trust  certificate  or other  interest  of any  trust of which  the
Stockholder  is trustee whose consent is required for the execution and delivery
of this agreement or the  consummation  by the  Stockholder of the  transactions
contemplated  hereby. If the Stockholder is married and the Stockholder's Shares
constitute community property, this agreement has been duly authorized, executed
and  delivered  by,  and  constitutes  a valid and  binding  agreement  of,  the
Stockholder's  spouse,  enforceable  against such Person in accordance  with its
terms  except  that  such  enforceability  (i)  may be  limited  by  bankruptcy,
insolvency,  moratorium  or other similar laws  relating to the  enforcement  of
creditors' rights generally and (ii) is subject to general  principles of equity
and  discretion  of the court before which any  proceedings  seeking  injunctive
relief or specific performance may be sought.

                  (c) No Conflicts. Except for filings, permits, authorizations,
consents and  approvals  under the HSR Act and the  Securities  Act of 1933,  if
applicable,  (A) no  filing  with,  and no  permit,  authorization,  consent  or
approval of, any state or federal  public body or authority is necessary for the
execution  of this  Agreement by the  Stockholder  and the  consummation  by the
Stockholder  of  the  transactions  contemplated  hereby  and  (B)  none  of the
execution and delivery of this Agreement by the Stockholder, the consummation by
the  Stockholder of the  transactions  contemplated  hereby or compliance by the
Stockholder with any of the provisions  hereof shall, in a manner which would be
material  and  adverse  to the  ability of the  Stockholder  to  consummate  the
transactions contemplated hereby or to comply with the terms hereof, result in a
violation or breach of, or constitute  (with or without  notice or lapse of time
or both) a  default  (or give  rise to any  third  party  right of  termination,
cancellation,  material  modification or  acceleration)  under any of the terms,
conditions  or  provisions  of any note,  bond,  mortgage,  indenture,  license,
contract, commitment, arrangement,  understanding, agreement or other instrument
or  obligation of any kind to which the  Stockholder  is a party or by which the
Stockholder or any of the  Stockholder's  properties or assets may be bound,  or
(3) violate any order, writ, injunction,  decree, judgment, order, statute, rule
or  regulation  applicable  to the  Stockholder  or  any  of  the  Stockholder's
properties or assets.

                  (d) No  Encumbrances.  Except as applicable in connection with
the  transactions  contemplated  hereby or as set forth on  Schedule  B attached
hereto, the Shares and the certificates  representing the Shares are now, and at
all times  during the term  hereof  will be,  held by the  Stockholder,  or by a
nominee or custodian for the benefit of the  Stockholder,  free and clear of all
liens,  claims,  security  interests,  proxies,  voting  trusts  or  agreements,
understandings or arrangements or any other encumbrances whatsoever,  except for
any such encumbrances or proxies arising hereunder in favor of Cordiant.

                  (e) No Finder's Fees. No broker,  investment banker, financial
adviser  or other  person  is  entitled  to any  broker's,  finder's,  financial
adviser's or other similar fee or commission in connection with the transactions
contemplated  hereby  based  upon  arrangements  made  by or on  behalf  of  the
Stockholder  other than Bear Stearns & Co. Inc.,  the fees and expenses of which
shall be paid by the Company.

                  (f) Reliance by Cordiant and Sub. The Stockholder  understands
and acknowledges that Cordiant and Sub are entering into the Merger Agreement in
reliance upon the Stockholder's execution and delivery of this Agreement.

         6.  Additional  Covenants of  the  Stockholder.  The Stockholder hereby
covenants to each of Cordiant and Sub as follows:

                  (a) No  Solicitation.  Subject to the provisions  contained in
Section 10 of this  Agreement,  the  Stockholder  shall not, in his  capacity as
such,   directly  or  indirectly,   solicit  (including  by  way  of  furnishing
information)  or respond to any  inquiries  or the making of any proposal by any
Person or entity (other than Cordiant or any affiliate of Cordiant) with respect
to the Company that constitutes a Takeover Proposal. If the Stockholder receives
any such  inquiry  or  proposal,  then the  Stockholder  shall  promptly  inform
Cordiant of the existence  thereof.  The Stockholder will immediately  cease and
cause to be terminated any existing activities, discussions or negotiations with
any parties conducted heretofore with respect to any of the foregoing.

                  (b)   Restriction   on   Transfer   of  Shares,   Proxies  and
Non-Interference.  Beginning on the date hereof and ending on the later to occur
of (A) last date the Stock Options are exercisable  pursuant to Section 3 hereof
and (B) the date that all of the Stockholder's  obligations under Section 2 have
terminated, except as contemplated by this Agreement or the Merger Agreement, no
Stockholder shall,  directly or indirectly,  (i) offer for sale, sell, transfer,
tender,  pledge,  encumber,  assign or  otherwise  dispose of, or enter into any
contract,  option or other  arrangement  or  understanding  with  respect  to or
consent to the offer for sale,  sale,  transfer,  tender,  pledge,  encumbrance,
assignment  or other  disposition  of, any or all of the Shares or any  interest
therein;  (ii) except as contemplated  by this  Agreement,  grant any proxies or
powers of attorney,  deposit any of the Shares into a voting trust or enter into
a voting  agreement with respect to any of the Shares;  or (iii) take any action
that would make any  representation  or  warranty of the  Stockholder  contained
herein  untrue or incorrect or have the effect of  preventing  or disabling  the
Stockholder from performing the Stockholder's  obligations under this Agreement.
Notwithstanding   anything  to  the  contrary  provided  in  this  Agreement,  a
Stockholder  shall have the right to make  Permitted  Transfers  of Shares.  The
Stockholder agrees with, and covenants to, Sub that beginning on the date hereof
and  ending on the last date the  Stock  Options  are  exercisable  pursuant  to
Section 3 hereof,  the Stockholder  shall not request that the Company  register
the transfer  (book-entry  or otherwise) of any  certificate  or  uncertificated
interest  representing  any of the  Shares,  unless  such  transfer  is  made in
compliance with this Agreement (including the provisions of Section 2 hereof).

                  (c) Additional  Shares.  The  Stockholder  agrees,  while this
Agreement is in effect (i) to notify  Cordiant and Sub promptly of the number of
any shares of Common  Stock  acquired by the  Stockholder  after the date hereof
(the "Additional  Shares") and (ii) to vote such Additional Shares in accordance
with Section 2 hereof. Such Additional Shares shall also be subject to the Stock
Option granted to Sub pursuant to Section 3 hereof and the restriction contained
in Section 6(b)(i) and (ii) above.

         7.  Representations  and  Warranties  of Cordiant and Sub. Cordiant and
Sub hereby  covenant,  represent  and  warrant to the  Stockholder  that each of
Cordiant and Sub has the legal  capacity,  power and authority to enter into and
perform all of such party's  obligations  under this  Agreement;  the execution,
delivery and  performance of this Agreement by Cordiant and Sub will not violate
or result in a breach of any other  material  agreement to which Cordiant or Sub
is a party; the execution and delivery of this Agreement and the consummation of
the transactions  contemplated hereby (i) have been duly authorized by the board
of  directors  of  Cordiant  and Sub,  and (ii) do not and will not  violate any
provision of the certificate of incorporation or by-laws of Cordiant or Sub; and
this  Agreement  has been duly and validly  executed  and  delivered  by each of
Cordiant and Sub and  constitutes  a valid and binding  agreement of such party,
enforceable against such party in accordance with its terms.

         8.  Further  Assurances.  From  time  to  time,  at the  other  party's
request and without further  consideration,  each party hereto shall execute and
deliver  such  additional   reasonable  documents  and  take  all  such  further
reasonable lawful action as may be necessary or desirable to consummate and make
effective,  in  the  most  expeditious  manner  practicable,   the  transactions
contemplated by this Agreement.

         9.  Termination;  Expenses  and  Fee. (a) The covenants and  agreements
contained herein with respect to the Shares shall terminate (i) in the event the
Merger  Agreement  is  terminated  in  accordance  with  its  terms,  upon  such
termination,  except that the  provisions of Sections 2, 3 and 6(b) hereof shall
survive any such  termination  solely in accordance with their terms and (ii) in
the event the Merger is  consummated,  at the  Effective  Time,  except that the
provisions of Section 4 hereof shall survive any such termination,  provided, in
each case, that the provisions of Section 12 and Section 13 hereof shall survive
any termination of this Agreement, and provided, further, that no termination of
this Agreement shall relieve any party of liability for a breach hereof.

         (b) Each  party shall bear its own expenses  in  connection  with  this
Agreement and the transactions contemplated hereby.

         10.  Stockholder   Capacity.  The  Stockholder  is not  executing  this
Agreement and does not make any agreement or understanding  herein in his or her
capacity as a director or officer of the  Company and nothing  contained  herein
shall limit or affect any actions taken by the  Stockholder in his capacity as a
director or officer of the Company to the extent such action is permitted by, or
not  prohibited  by,  the  Merger  Agreement,  and none of such  actions in such
capacities  shall be  deemed  to  constitute  a breach  of this  Agreement.  The
Stockholder  signs solely in his capacity as the record and beneficial owner of,
or the trustee of a trust whose  beneficiaries are the beneficial owners of, the
Shares.

         11.   Sophistication.  The  Stockholder  acknowledges  that  he  is  an
informed  and  sophisticated  investor  and,  together  with his  advisors,  has
undertaken  such  investigation  as they have deemed  necessary,  including  the
review of the Merger Agreement and this Agreement,  to enable the Stockholder to
make an informed and intelligent  decision with respect to the Merger  Agreement
and this Agreement and the transactions contemplated thereby and hereby.

         12.   Confidentiality.  Each  of the  parties  hereto  recognizes  that
successful  consummation of the transactions  contemplated by this Agreement may
be  dependent  upon  confidentiality  with  respect to the  matters  referred to
herein. In this connection, pending public disclosure thereof, each party hereby
agrees not to disclose or discuss  such  matters with anyone not a party to this
Agreement or the Merger Agreement (other than such party's counsel and advisors,
if any) without the prior written consent of the other party, except for filings
required  pursuant to the Exchange Act and the rules and regulations  thereunder
or disclosures  such party's  counsel  advises are necessary in order to fulfill
such  party's  obligations  imposed by law, in which event such party shall give
notice of such disclosure to the other party as promptly as practicable so as to
enable the other  party to seek a  protective  order  from a court of  competent
jurisdiction with respect thereto.

         13.  Miscellaneous.

                  (a) Entire Agreement.  This Agreement and the Merger Agreement
constitute the entire agreement  between the parties with respect to the subject
matter hereof and supersede all other prior agreements and understandings,  both
written and oral, between the parties with respect to the subject matter hereof.

                  (b) Certain Events. The Stockholder agrees that this Agreement
and the obligations hereunder shall attach to the Stockholder's Shares and shall
be binding upon any person or entity to which legal or  beneficial  ownership of
such Shares shall pass,  whether by operation  of law or  otherwise,  including,
without  limitation,  the  Stockholder's  heirs,  guardians,  administrators  or
successors,  provided,  that following the Effective  Time, this Agreement shall
not be binding on any  purchaser of Shares in a  transaction  made in compliance
with Section 4(b), other than Permitted Transfers.  Notwithstanding any transfer
of  Shares,  the  transferor  shall  remain  liable for the  performance  of all
obligations under this Agreement of the transferor.

                  (c) Change in Control.  In the event that after the  Effective
Time (i) any Person or group of Persons  acting in  concert  (as  defined in the
City Code on Take-overs and Mergers in the United Kingdom)  acquires an interest
in the equity share capital of Cordiant (an "Acquiring Person") and, immediately
following such  acquisition,  such person,  or group,  holds shares  entitled to
exercise  more than 50% of the votes  which may be cast at a general  meeting of
Cordiant or (ii) a majority of the board of  directors  of Cordiant  immediately
prior  to  such  Person  becoming  an  Acquiring  Person,  cease  to  thereafter
constitute a majority of the board of directors of Cordiant  (other than through
elections of directors  whose  nomination  for election by the  shareholders  of
Cordiant  were  approved by the vote of a majority of  directors of Cordiant who
were either  directors prior to a Person  becoming an Acquiring  Person or whose
election or  nomination  for  election  was so  previously  approved),  then the
restrictions on Dispositions contained in Section 4, shall terminate without any
action on the part of any party hereto.

                  (d)  Assignment.  This  Agreement  shall  not be  assigned  by
operation of law or  otherwise  without the prior  written  consent of the other
party,  provided,  that Cordiant or Sub may assign, in its sole discretion,  its
rights  and  obligations  hereunder  to any  direct  or  indirect  wholly  owned
subsidiary of Cordiant,  but no such assignment shall relieve Cordiant or Sub of
its  obligations  hereunder  if such  assignee  does not or cannot  perform such
obligations.

                  (e)  Amendments,  Waivers,  Etc.  This  Agreement  may  not be
amended,  changed,  supplemented,  waived or otherwise  modified or  terminated,
except upon the  execution and delivery of a written  agreement  executed by the
party to be charged  thereby  or,  with  respect to  termination,  as  otherwise
provided herein.

                  (f) Notices. All notices,  requests, claims, demands and other
communications  hereunder  shall be in writing  and shall be given (and shall be
deemed to have been duly received if so given) by hand delivery, telegram, telex
or telecopy,  or by mail (registered or certified mail, postage prepaid,  return
receipt requested) or by any courier service, such as Federal Express, providing
proof of  delivery.  All  communications  hereunder  shall be  delivered  to the
respective parties at the following addresses:

         If to the Stockholder:     The Steve Girgenti Charitable Lead
                                      Annuity Trust
                                    c/o Healthworld Corporation
                                    100 Avenue of the Americas
                                    New York, New York 10010
                                    Attention: Steven Girgenti
                                    Facsimile: (212) 966-2743

         and

         If to Cordiant or
         Sub to:                    Cordiant Communications Group plc
                                    121-141 Westbourne Terrace
                                    London W2 6JR
                                    Attention: Deputy Finance Director
                                    Facsimile: +44-171-262-4300

         copy to:                   White & Case LLP
                                    1155 Avenue of the Americas
                                    New York, New York  10036-2787
                                    Attention:  Timothy B. Goodell, Esq.
                                    Facsimile:  (212) 354-8113

or to such  other  address  as the  person  to whom  notice  is  given  may have
previously furnished to the others in writing in the manner set forth above.

                  (g) Severability. Whenever possible, each provision or portion
of any provision of this  Agreement  will be interpreted in such manner as to be
effective and valid under  applicable law but if any provision or portion of any
provision of this Agreement is held to be invalid,  illegal or  unenforceable in
any  respect  under  any  applicable  law  or  rule  in any  jurisdiction,  such
invalidity,  illegality or unenforceability  will not affect any other provision
or portion of any provision in such  jurisdiction,  and this  Agreement  will be
reformed,  construed  and  enforced  in such  jurisdiction  as if such  invalid,
illegal or  unenforceable  provision or portion of any  provision had never been
contained herein.

                  (h)  Specific   Performance.   Each  of  the  parties   hereto
recognizes and  acknowledges  that a breach by it of any covenants or agreements
contained in this  Agreement will cause the aggrieved  party to sustain  damages
for which it would not have an  adequate  remedy at law for money  damages,  and
therefore each of the parties hereto agrees that in the event of any such breach
the aggrieved  party shall be entitled to the remedy of specific  performance of
such  covenants and agreements  and  injunctive  and other  equitable  relief in
addition to any other remedy to which it may be entitled, at law or in equity.

                  (i)  Remedies  Cumulative.  All  rights,  powers and  remedies
provided under this Agreement or otherwise available in respect hereof at law or
in equity  shall be  cumulative  and not  alternative,  and the  exercise of any
thereof by any party shall not preclude the  simultaneous  or later  exercise of
any other such right, power or remedy by such party.

                  (j) No Waiver. The failure of any party hereto to exercise any
right,  power or remedy provided under this Agreement or otherwise  available in
respect  hereof at law or in equity,  or to insist upon  compliance by any other
party hereto with its obligations  hereunder,  and any custom or practice of the
parties at variance with the terms hereof, shall not constitute a waiver by such
party of its right to exercise  any such or other  right,  power or remedy or to
demand such compliance.

                  (k)  No  Third  Party  Beneficiaries.  This  Agreement  is not
intended to be for the benefit of, and shall not be  enforceable  by, any person
or entity who or which is not a party hereto.

                  (l)  Governing  Law.  This  Agreement  shall be  governed  and
construed in accordance  with the laws of the State of New York,  without giving
effect to the principles of conflicts of law thereof.

                  (m) Jurisdiction. Each party hereby irrevocably submits to the
exclusive  jurisdiction of the Court of Chancery in the State of Delaware or the
United States District Court for the Southern  District of New York or any court
of the State of New York located in the City of New York in any action,  suit or
proceeding  arising in connection with this Agreement,  and agrees that any such
action,  suit or proceeding  shall be brought only in such court (and waives any
objection  based  on  forum  non  conveniens  or any  other  objection  to venue
therein); provided, however, that such consent to jurisdiction is solely for the
purpose  referred  to in this  paragraph  (1) and  shall  not be  deemed to be a
general  submission  to the  jurisdiction  of said  Courts  or in the  States of
Delaware  or New York other than for such  purposes.  Each party  hereto  hereby
waives any right to a trial by jury in connection with any such action,  suit or
proceeding.

                  (n) Descriptive Headings. The descriptive headings used herein
are inserted for  convenience  of reference only and are not intended to be part
of or to affect the meaning or interpretation of this Agreement.

                  (o)   Counterparts.   This   Agreement   may  be  executed  in
counterparts, each of which shall be deemed to be an original, but all of which,
taken together, shall constitute one and the same Agreement.


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<PAGE>


         IN WITNESS WHEREOF,  Cordiant, Sub and the Stockholder have caused this
Agreement to be duly executed as of the day and year first above written.


                                        CORDIANT COMMUNICATIONS GROUP PLC


                                        By: /s/ Arthur D'Angelo
                                            -----------------------------
                                            Name:  Arthur D'Angelo
                                            Title: Finance Director



                                        HEALTHWORLD ACQUISITION CORP.


                                        By: /s/ Arthur D'Angelo
                                            -----------------------------
                                            Name:  Arthur D'Angelo
                                            Title: President



                                        THE STEVE GIRGENTI CHARITABLE
                                          LEAD ANNUITY TRUST

                                        By: /s/ Steven Girgenti
                                            -----------------------------
                                            Name:  Steven Girgenti
                                            Title: Trustee


<PAGE>



           Schedule B to Stockholder Agreement of The Steve Girgenti
                          Charitable Lead Annuity Trust



No exceptions.




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