WARRANT AGREEMENT

     AGREEMENT,  dated as of this ____th day of ___________,  199_, by and among
HEURISTIC DEVELOPMENT GROUP, INC., a Delaware corporation ("Company"),  AMERICAN
STOCK TRANSFER & TRUST COMPANY, as Warrant Agent (the "Warrant Agent"), and D.H.
BLAIR  INVESTMENT  BANKING  CORP.,  a  New  York  corporation  ("Blair"  or  the
"Underwriter").

                               W I T N E S S E T H

     WHEREAS,  in  connection  with a public  offering of up to 1,380,000  units
("Units"),  each unit consisting of one (1) share of the Company's Common Stock,
$.01 par value ("Common  Stock"),  one (1) redeemable  Class A Warrant ("Class A
Warrants") and one (1) redeemable Class B Warrant ("Class B Warrants")  pursuant
to   an   underwriting   agreement   (the   "Underwriting    Agreement")   dated
_______________,  199_  between the  Company  and Blair and the  issuance to the
Underwriter  or its designees of Unit Purchase  Options to purchase an aggregate
of  120,000  additional  Units,  to be dated as of  __________,  199_ (the "Unit
Purchase  Options"),  the Company may issue up to 1,500,000 Class A Warrants and
1,500,000  Class B Warrants  (the Class A Warrants  and Class B Warrants  may be
collectively referred to as "Warrants"); and

     WHEREAS,  each Class A Warrant  initially  entitles the  Registered  Holder
thereof to purchase  one (1) share of Common  Stock and one (1) Class B Warrant,
and  accordingly,  the Company may issue up to an additional  1,500,000  Class B
Warrants; and

     WHEREAS,  each Class B Warrant  initially  entitles the  Registered  Holder
thereof to purchase one (1) share of Common Stock; and

     WHEREAS,  pursuant to a private  placement  in December  1996,  the Company
issued  to  the  selling  securityholders  (the  "Selling  Securityholders")  an
aggregate of 500,000 Class A Warrants and upon exercise of the Class A Warrants,
the Company may issue an addition 500,000 Class B Warrants; and

     WHEREAS,  the Company  desires  the  Warrant  Agent to act on behalf of the
Company,  and the  Warrant  Agent is willing to so act, in  connection  with the
issuance,  registration,  transfer exchange and redemption of the Warrants,  the
issuance  of  certificates  representing  the  Warrants,  the  exercise  of  the
Warrants, and the rights of the Registered Holders thereof;

     NOW THEREFORE,  in consideration of the premises and the mutual  agreements
hereinafter  set forth and for the purpose of defining the terms and  provisions
of  the  Warrants  and  the  certificates  representing  the  Warrants  and  the
respective  rights and  obligations  thereunder  of the Company,  the holders of
certificates representing the Warrants and the Warrant Agent, the parties hereto
agree as follows:







     SECTION 1. Definitions.  As used herein, the following terms shall have the
following meanings, unless the context shall otherwise require:

     (a)  "Aggregate  Per Share Price"  shall mean the Purchase  Price per share
multiplied by the number of shares of Common Stock purchasable upon the exercise
of a Warrant.

     (b) "Class A Aggregate Per Share Price" shall mean $6.50.

     (c) "Class B Aggregate Per Share Price" shall mean $8.75.

     (d) "Common  Stock"  shall mean stock of the Company of any class,  whether
now  or  hereafter  authorized,  which  has  the  right  to  participate  in the
distribution of earnings and assets of the Company without limit as to amount or
percentage,  which at the date hereof  consists of  20,000,000  shares of Common
Stock, $.01 par value.

     (e)  "Corporate  Office" shall mean the office of the Warrant Agent (or its
successor)  at which at any  particular  time its  principal  business  shall be
administered,  which office is located at the date hereof at 40 Wall Street, New
York, NewYork.

     (f) "Exercise  Date" shall mean,  as to any Warrant,  the date on which the
Warrant Agent shall have received both (a) the Warrant Certificate  representing
such Warrant,  with the exercise  form thereon duly  executed by the  Registered
Holder  thereof or his attorney duly  authorized in writing,  and (b) payment in
cash, or by official bank or certified check made payable to the Company,  of an
amount in lawful money of the United States of America  equal to the  applicable
Purchase Price.

     (g) "Initial  Warrant  Exercise Date" shall mean as to each Class A Warrant
and Class B Warrant __________, 1997.

     (h) "Market Price" shall mean shall mean (i) the average  closing bid price
of the Common  Stock,  for thirty (30)  consecutive  business days ending on the
Calculation  Date as  reported by Nasdaq,  if the Common  Stock is traded on the
Nasdaq  SmallCap  Market,  or (ii) the average last  reported  sale price of the
Common  Stock,  for  thirty  (30)  consecutive   business  days  ending  on  the
Calculation  Date, as reported by the primary exchange on which the Common Stock
is traded, if the Common Stock is traded on a national securities  exchange,  or
by Nasdaq, if the Common Stock is traded on the Nasdaq National Market.

     (i) "Purchase Price" shall mean the purchase price to be paid upon exercise
of each Class A Warrant or Class B Warrant in accordance  with the terms hereof,
which price shall be $6.50 as to the Class A Warrants  and $8.75 as to the Class
B Warrants,  subject to adjustment  from time to time pursuant to the provisions
of Section 9 hereof,  and subject to the Company's  right to reduce the Purchase
Price upon notice to all Registered Holders of Warrants.



                                       -2-





     (j)  "Redemption  Price"  shall mean the price at which the Company may, at
its  option in  accordance  with the terms  hereof,  redeem the Class A Warrants
and/or Class B Warrants, which price shall be $0.05 per Warrant.

     (k)  "Registered  Holder"  shall  mean  as to  any  Warrant  and  as of any
particular  date,  the person in whose  name the  certificate  representing  the
Warrant shall be registered on that date on the books  maintained by the Warrant
Agent pursuant to Section 6.

     (l) "Transfer Agent" shall mean American Stock Transfer & Trust Company, as
the Company's transfer agent, or its authorized successor, as such.

     (m)  "Warrant  Expiration  Date"  shall  mean 5:00 P.M.  (New York time) on
_____,  2002 or,  with  respect  to  Warrants  which are  outstanding  as of the
applicable Redemption Date (as defined in Section 8) and specifically  excluding
Warrants  issuable upon  exercise of Unit Purchase  Options if the Unit Purchase
Options have not been  exercised,  the  Redemption  Date,  whichever is earlier;
provided  that if such date shall in the State of New York be a holiday or a day
on which banks are  authorized  or required to close,  then 5:00 P.M.  (New York
time) on the next  following day which in the State of New York is not a holiday
or a day on which banks are authorized or required to close.  Upon notice to all
Registered  Holders,  the  Company  shall have the right to extend  the  Warrant
Expiration Date.

     SECTION 2. Warrants and Issuance of Warrant Certificates.

     (a) A Class A Warrant  initially shall entitle the Registered Holder of the
Warrant  Certificate  representing  such Warrant to purchase one share of Common
Stock and one Class B Warrant upon the exercise thereof,  in accordance with the
terms hereof, subject to modification and adjustment as provided in Section 9.

     (b) A Class B Warrant  initially shall entitle the Registered Holder of the
Warrant  Certificate  representing  such Warrant to purchase one share of Common
Stock upon the exercise thereof, in accordance with the terms hereof, subject to
modification and adjustment as provided in Section 9.

     (c) The Class A Warrants  and Class B Warrants  included in the offering of
Units will be detachable and separately transferable immediately from the shares
of Common Stock  constituting part of such Units. The Class B Warrants will also
be detachable and separately transferable  immediately from the shares of Common
Stock issued upon exercise of the Class A Warrants.

     (d) Upon execution of this Agreement, Warrant Certificates representing the
number  of  Class  A  Warrants  and  Class  B  Warrants  sold  pursuant  to  the
Underwriting  Agreement  shall be executed by the Company and  delivered  to the
Warrant  Agent.  Upon written  order of the Company  signed by its  President or
Chairman or a Vice President and by its Secretary or an Assistant

                                                                                
                                       -3-





Secretary, the Warrant Certificates shall be countersigned, issued and delivered
by the Warrant Agent as part of the Units.

     (e) From time to time,  up to the Warrant  Expiration  Date,  the  Transfer
Agent shall countersign and deliver stock  certificates in required whole number
denominations  representing  up to an aggregate  of  7,000,000  shares of Common
Stock,  subject to adjustment as described herein, upon the exercise of Warrants
in accordance with this Agreement.

     (f) From time to time, up to the Warrant Expiration Date, the Warrant Agent
shall  countersign  and deliver  Warrant  Certificates  in required whole number
denominations to the persons entitled thereto in connection with any transfer or
exchange permitted under this Agreement;  provided that no Warrant  Certificates
shall be issued except (i) those initially issued  hereunder,  (ii) those issued
on or after the Initial  Warrant  Exercise Date, upon the exercise of fewer than
all Warrants represented by any Warrant Certificate, to evidence any unexercised
Warrants held by the exercising  Registered Holder,  (iii) those issued upon any
transfer or exchange  pursuant to Section 6; (iv) those issued in replacement of
lost, stolen, destroyed or mutilated Warrant Certificates pursuant to Section 7;
(v) those issued pursuant to the Unit Purchase Option; (vi) at the option of the
Company,  in such  form as may be  approved  by the its Board of  Directors,  to
reflect any adjustment or change in the Purchase Price,  the number of shares of
Common Stock  purchasable  upon exercise of the Warrants or the Target  Price(s)
therefor  made  pursuant  to Section 8 hereof;  and (vii) those Class B Warrants
issued upon exercise of Class A Warrants.

     (g) Pursuant to the terms of the Unit Purchase Options, the Underwriter may
purchase up to 120,000  Units,  which include up to 120,000 Class A Warrants and
240,000  Class B Warrants.  Notwithstanding  anything to the contrary  contained
herein, the Warrants underlying the Unit Purchase Option shall not be subject to
redemption by the Company except under the terms and conditions set forth in the
Unit Purchase Options.

     SECTION 3. Form and Execution of Warrant Certificates.

     (a) The Warrant  Certificates  shall be  substantially  in the form annexed
hereto as Exhibit A as to the Class A Warrants  and  Exhibit B as to the Class B
Warrants (the provisions of which are hereby  incorporated  herein) and may have
such letters,  numbers or other marks of  identification or designation and such
legends, summaries or endorsements printed,  lithographed or engraved thereon as
the Company may deem appropriate and as are not inconsistent with the provisions
of this Agreement, or as may be required to comply with any law or with any rule
or regulation made pursuant  thereto or with any rule or regulation of any stock
exchange on which the Class A Warrants or Class B Warrants may be listed,  or to
conform  to  usage  or  to  the   requirements  of  Section  2(d).  The  Warrant
Certificates  shall be dated the date of issuance  thereof (whether upon initial
issuance, transfer, exchange or in lieu of mutilated, lost, stolen, or destroyed
Warrant  Certificates) and issued in registered form. Warrant Certificates shall
be  numbered   serially  with  the  letters  AW  on  Class  A  Warrants  of  all
denominations and the letters BW on Class B Warrants of all denominations.

                                                                                
                                       -4-





     (b) Warrant  Certificates shall be executed on behalf of the Company by its
Chairman of the Board,  President or any Vice  President and by its Secretary or
an Assistant Secretary,  by manual signatures or by facsimile signatures printed
thereon,  and shall have  imprinted  thereon a facsimile of the Company's  seal.
Warrant  Certificates  shall be manually  countersigned by the Warrant Agent and
shall not be valid for any purpose unless so countersigned.  In case any officer
of the Company who shall have signed any of the Warrant Certificates shall cease
to be an officer of the Company or to hold the particular  office  referenced in
the Warrant Certificate before the date of issuance of the Warrant  Certificates
or before  countersignature by the Warrant Agent and issue and delivery thereof,
such Warrant  Certificates  may  nevertheless  be  countersigned  by the Warrant
Agent,  issued and delivered with the same force and effect as though the person
who  signed  such  Warrant  Certificates  had not ceased to be an officer of the
Company or to hold such office.  After  countersignature  by the Warrant  Agent,
Warrant  Certificates  shall be delivered by the Warrant Agent to the Registered
Holder without  further action by the Company,  except as otherwise  provided by
Section 4(a) hereof.

     SECTION 4. Exercise.

     (a) Each Warrant may be exercised by the  Registered  Holder thereof at any
time on or after the Initial Exercise Date, but not after the Warrant Expiration
Date,  upon the terms and subject to the  conditions set forth herein and in the
applicable Warrant Certificate. A Warrant shall be deemed to have been exercised
immediately  prior to the close of business on the Exercise  Date and the person
entitled to receive  the  securities  deliverable  upon such  exercise  shall be
treated for all purposes as the holder of those  securities upon the exercise of
the  Warrant  as of the  close of  business  on the  Exercise  Date.  As soon as
practicable  on or after the Exercise  Date, the Warrant Agent shall deposit the
proceeds received from the exercise of a Warrant and shall notify the Company in
writing of the exercise of the Warrants.  Promptly  following,  and in any event
within  five days after the date of such  notice  from the  Warrant  Agent,  the
Warrant Agent, on behalf of the Company,  shall cause to be issued and delivered
by the Transfer Agent, to the person or persons  entitled to receive the same, a
certificate or certificates  for the securities  deliverable upon such exercise,
(plus a  Warrant  Certificate  for any  remaining  unexercised  Warrants  of the
Registered Holder) unless prior to the date of issuance of such certificates the
Company  shall  instruct the Warrant Agent to refrain from causing such issuance
of certificates  pending clearance of checks received in payment of the Purchase
Price pursuant to such Warrants.  Notwithstanding the foregoing,  in the case of
payment  made in the form of a check drawn on an account of the  Underwriter  or
such other investment banks and brokerage houses as the Company shall approve in
writing to the Warrant Agent,  certificates  shall immediately be issued without
prior  notice to the Company or any delay.  Upon the exercise of any Warrant and
clearance of the funds  received,  the Warrant  Agent shall  promptly  remit the
payment  received for the Warrant (the "Warrant  Proceeds") to the Company or as
the Company may direct in writing,  subject to the  provisions  of Sections 4(b)
and 4(c) hereof.

     (b) If, at the  Exercise  Date in respect of the  exercise  of any  Warrant
after _____, 1998, (i) the market price of the Company's Common Stock is greater
than the then  Purchase  Price of the Warrant,  (ii) the exercise of the Warrant
was solicited by a member of the National Association

                                                                               
                                       -5-





of  Securities  Dealers,  Inc.  ("NASD") as designated in writing on the Warrant
Certificate Subscription Form, (iii) the Warrant was not held in a discretionary
account, (iv) disclosure of compensation  arrangements was made both at the time
of the original  offering and at the time of exercise;  and (v) the solicitation
of the  exercise of the Warrant was not in violation of Rule 10b-6 (as such rule
or any successor rule may be in effect as of such time of exercise)  promulgated
under  the   Securities   Exchange  Act  of  1934,   then  the  Warrant   Agent,
simultaneously  with the  distribution  of the  Warrant  Proceeds to the Company
shall, on behalf of the Company, pay from the Warrant Proceeds, a fee of 5% (the
"Exercise Fee") of the Purchase Price to the Underwriter (of which a portion may
be reallowed by the Underwriter to the dealer who solicited the exercise,  which
may  also be the  Underwriter  or D.H.  Blair & Co.,  Inc.).  In the  event  the
Exercise Fee is not  received  within five days of the date on which the Company
receives Warrant  Proceeds,  then the Exercise Fee shall begin accruing interest
at an annual rate of prime plus four percent (4%), payable by the Company to the
Underwriter at the time the  Underwriter  receives the Exercise Fee. Within five
days after  exercise the Warrant  Agent shall send to the  Underwriter a copy of
the reverse side of each Warrant exercised.  The Underwriter shall reimburse the
Warrant Agent, upon request,  for its reasonable expenses relating to compliance
with this section 4(b).  The Company  shall pay all fees and expenses  including
all  blue  sky  fees  and  expenses  and  all  out-of-pocket   expenses  of  the
Underwriter,   including  legal  fees,  in  connection  with  the  solicitation,
redemption or exchange of the Warrants.  In addition,  the  Underwriter  and the
Company  may at any time  during  business  hours,  examine  the  records of the
Warrant Agent, including its ledger of original Warrant Certificates returned to
the Warrant Agent upon exercise of Warrants.  The  provisions of this  paragraph
may not be modified, amended or deleted without the prior written consent of the
Underwriter.

     (c) In order to enforce the provisions of Section 4(b) above,  in the event
there is any  dispute or  question  as to the amount or payment of the  Exercise
Fee, the Warrant Agent is hereby expressly authorized to withhold payment to the
Company of the  Warrant  Proceeds  unless and until the Company  establishes  an
escrow  account for the purpose of depositing  the entire amount of the Exercise
Fee,  which amount will be deducted from the net Warrant  Proceeds to be paid to
the Company.  The funds placed in the escrow  account may not be released to the
Company  without a written  agreement  from the  Underwriter  that the  required
Exercise Fee has been received by the Underwriter.

     SECTION 5. Reservation of Shares; Listing; Payment of Taxes; etc.

     (a) The  Company  covenants  that it will at all  times  reserve  and  keep
available out of its  authorized  Common Stock,  solely for the purpose of issue
upon  exercise of Warrants,  such number of shares of Common Stock as shall then
be issuable upon the exercise of all outstanding Warrants. The Company covenants
that all shares of Common  Stock which shall be  issuable  upon  exercise of the
Warrants shall, at the time of delivery, be duly and validly issued, fully paid,
nonassessable  and free from all taxes,  liens and charges  with  respect to the
issue  thereof,  (other  than those  which the  Company  shall  promptly  pay or
discharge)  and that upon  issuance such shares shall be listed on each national
securities  exchange,  on which the other shares of outstanding  Common Stock of
the Company are then listed or shall be  eligible  for  inclusion  in the Nasdaq
National Market
                                                                               
                                       -6-





or the Nasdaq SmallCap Market if the other shares of outstanding Common Stock of
the Company are so included.

     (b) The Company  covenants  that if any  securities  to be reserved for the
purpose of exercise of Warrants hereunder require registration with, or approval
of, any  governmental  authority  under any federal  securities  law before such
securities  may be validly  issued or  delivered  upon such  exercise,  then the
Company will in good faith and as expeditiously as reasonably possible, endeavor
to secure such registration or approval. The Company will use reasonable efforts
to  obtain  appropriate  approvals  or  registrations  under  state  "blue  sky"
securities laws. With respect to any such securities,  however, Warrants may not
be exercised by, or shares of Common Stock issued to, any  Registered  Holder in
any state in which such exercise would be unlawful.

     (c) The Company shall pay all documentary, stamp or similar taxes and other
governmental  charges  that may be  imposed  with  respect  to the  issuance  of
Warrants,  or the  issuance or  delivery of any shares or Class B Warrants  upon
exercise of the Class A Warrants, or the issuance or delivery of any shares upon
exercise  of the Class B  Warrants;  provided,  however,  that if the  shares of
Common  Stock or Class B Warrants,  as the case may be, are to be delivered in a
name other than the name of the  Registered  Holder of the  Warrant  Certificate
representing  any Warrant being  exercised,  then no such delivery shall be made
unless the person  requesting  the same has paid to the Warrant Agent the amount
of transfer taxes or charges incident thereto, if any.

     (d) The Warrant Agent is hereby  irrevocably  authorized to requisition the
Company's Transfer Agent from time to time for certificates  representing shares
of Common Stock  issuable upon  exercise of the  Warrants,  and the Company will
authorize the Transfer  Agent to comply with all such proper  requisitions.  The
Company will file with the Warrant Agent a statement  setting forth the name and
address of the Transfer Agent of the Company for shares of Common Stock issuable
upon exercise of the Warrants.

     SECTION 6. Exchange and Registration of Transfer.

     (a) Warrant  Certificates  may be exchanged for other Warrant  Certificates
representing an equal  aggregate  number of Warrants of the same class or may be
transferred in whole or in part.  Warrant  Certificates to be exchanged shall be
surrendered to the Warrant Agent at its Corporate Office,  and upon satisfaction
of the terms and  provisions  hereof,  the Company shall execute and the Warrant
Agent shall  countersign,  issue and deliver in  exchange  therefor  the Warrant
Certificate  or  Certificates  which the  Registered  Holder making the exchange
shall be entitled to receive.

     (b) The Warrant  Agent shall keep at its office books in which,  subject to
such  reasonable  regulations  as it may prescribe,  it shall  register  Warrant
Certificates and the transfer  thereof in accordance with its regular  practice.
Upon due presentment for registration of transfer of any Warrant  Certificate at
such office, the Company shall execute and the Warrant Agent shall issue

                                                                    
                                       -7-





and  deliver to the  transferee  or  transferees  a new Warrant  Certificate  or
Certificates representing an equal aggregate number of Warrants.

     (c) With respect to all Warrant Certificates  presented for registration or
transfer,  or for exchange or  exercise,  the  subscription  form on the reverse
thereof shall be duly endorsed,  or be  accompanied  by a written  instrument or
instruments of transfer and  subscription,  in form  satisfactory to the Company
and  the  Warrant  Agent,   duly  executed  by  the  Registered  Holder  or  his
attorney-in-fact duly authorized in writing.

     (d) A service  charge may be imposed by the Warrant  Agent for any exchange
or registration of transfer of Warrant  Certificates.  In addition,  the Company
may require payment by such holder of a sum sufficient to cover any tax or other
governmental charge that may be imposed in connection therewith.

     (e) All Warrant  Certificates  surrendered  for exercise or for exchange in
case of  mutilated  Warrant  Certificates  shall be  promptly  cancelled  by the
Warrant Agent and thereafter  retained by the Warrant Agent until termination of
this  Agreement or  resignation  as Warrant  Agent,  or, with the prior  written
consent of the  Underwriter,  disposed of or destroyed,  at the direction of the
Company.

     (f) Prior to due presentment  for  registration  of transfer  thereof,  the
Company and the Warrant  Agent may deem and treat the  Registered  Holder of any
Warrant   Certificate  as  the  absolute  owner  thereof  and  of  each  Warrant
represented  thereby  (notwithstanding  any  notations  of  ownership or writing
thereon  made by anyone other than a duly  authorized  officer of the Company or
the Warrant  Agent) for all  purposes and shall not be affected by any notice to
the  contrary.  The  Warrants,  which are being  publicly  offered in Units with
shares  of  Common  Stock  pursuant  to  the  Underwriting  Agreement,  will  be
immediately  detachable  from  the  Common  Stock  and  transferable  separately
therefrom.

     SECTION 7. Loss or Mutilation.  Upon receipt by the Company and the Warrant
Agent of evidence  satisfactory  to them of the  ownership  of and loss,  theft,
destruction or mutilation of any Warrant Certificate and (in case of loss, theft
or  destruction)  of  indemnity  satisfactory  to  them,  and  (in  the  case of
mutilation) upon surrender and cancellation  thereof,  the Company shall execute
and the Warrant  Agent  shall ( in the  absence of notice to the Company  and/or
Warrant  Agent that the  Warrant  Certificate  has been  acquired by a bona fide
purchaser)  countersign  and deliver to the Registered  Holder in lieu thereof a
new Warrant  Certificate of like tenor representing an equal aggregate number of
Class A  Warrants  or Class B  Warrants.  Applicants  for a  substitute  Warrant
Certificate  shall comply with such other  reasonable  regulations  and pay such
other reasonable charges as the Warrant Agent may prescribe.



                                       -8-





     SECTION 8. Redemption.

     (a) Subject to the  provisions of paragraph  2(g) hereof,  on not less than
thirty  (30) days  notice  given at any time  after____,  1998 (the  "Redemption
Notice"), to Registered Holders of the Warrants being redeemed at any time after
____,  1998 the  Warrants may be  redeemed,  at the option of the Company,  at a
redemption  price of $0.05 per  Warrant,  provided the Market Price shall exceed
$9.10 with  respect to the Class A Warrants and $12.25 with respect to the Class
B Warrants (the "Target Prices"),  subject to adjustment as set forth in Section
8(f),  below.  All Warrants of a class must be redeemed if any of that class are
redeemed,  provided that the Warrants  underlying  the Unit Purchase  Option may
only be redeemed in compliance  with and subject to the terms and  conditions of
the Unit Purchase  Option.  For purposes of this Section 8, the Calculation Date
shall mean a date  within  fifteen  (15) days of the  mailing of the  Redemption
Notice.  The date fixed for  redemption of the Warrants is referred to herein as
the "Redemption  Date".  The Class B Warrant  Redemption Date may not be earlier
than thirty-one (31) days after the Class A Warrant Redemption Date.

     (b) If the  conditions  set forth in Section  8(a) are met, and the Company
desires to  exercise  its right to redeem the  Warrants,  it shall  request  the
Underwriter to mail a Redemption Notice to each of the Registered Holders of the
Warrants  to be  redeemed,  first  class,  postage  prepaid,  not later than the
thirtieth  day before the date fixed for  redemption,  at their last  address as
shall  appear on the records  maintained  pursuant to Section  6(b).  Any notice
mailed in the manner provided herein shall be conclusively presumed to have been
duly given whether or not the Registered Holder receives such notice.

     (c) The Redemption  Notice shall specify (i) the redemption price, (ii) the
Redemption  Date,  (iii)  the  place  where the  Warrant  Certificates  shall be
delivered and the redemption  price paid, (iv) that the Underwriter  will assist
each Registered  Holder of a Warrant in connection with the exercise thereof and
(v) that the right to exercise the Warrant  shall  terminate  at 5:00 P.M.  (New
York time) on the business day  immediately  preceding the  Redemption  Date. No
failure to mail such  notice nor any defect  therein or in the  mailing  thereof
shall affect the validity of the proceedings for such redemption  except as to a
Registered  Holder (a) to whom  notice  was not  mailed or (b) whose  notice was
defective. An affidavit of the Warrant Agent or of the Secretary or an Assistant
Secretary of the  Underwriter  or the Company that notice of redemption has been
mailed  shall,  in the absence of fraud,  be prima  facie  evidence of the facts
stated therein.

     (d) Any right to exercise a Warrant shall  terminate at 5:00 P.M. (New York
time) on the business day  immediately  preceding  the  Redemption  Date. On and
after the  Redemption  Date,  Registered  Holders of the Warrants  shall have no
further rights except to receive,  upon surrender of the Warrant, the Redemption
Price.

     (e) From and after the Redemption  Date,  the Company  shall,  at the place
specified in the  Redemption  Notice,  upon  presentation  and  surrender to the
Company by or on behalf of the Registered  Holder thereof of one or more Warrant
Certificates evidencing Warrants to be redeemed,


                                       -9-





deliver or cause to be delivered to or upon the written order of such Registered
Holder a sum in cash equal to the  Redemption  Price of each such Warrant.  From
and after the  Redemption  Date and upon the  deposit  or  setting  aside by the
Company of a sum  sufficient to redeem all the Warrants  called for  redemption,
such  Warrants  shall expire and become void and all rights  hereunder and under
the Warrant Certificates,  except the right to receive payment of the Redemption
Price, shall cease.

     (f) If the shares of the Company's  Common Stock are subdivided or combined
into a greater or smaller  number of shares of Common  Stock,  the Target Prices
shall be  proportionally  adjusted by the ratio which the total number of shares
of Common Stock  outstanding  immediately prior to such event bears to the total
number of shares of Common Stock to be outstanding immediately after such event.

     SECTION  9.  Adjustment  of  Exercise  Price and Number of Shares of Common
Stock or Warrants.

     (a) Subject to the  exceptions  referred to in Section  9(g) below,  in the
event the Company shall, at any time or from time to time after the date hereof,
sell any  shares of Common  Stock for a  consideration  per share  less than the
Market  Price (as  defined  in  Section  8) on the date of the sale or issue any
shares of Common Stock as a stock  dividend to the holders of Common  Stock,  or
subdivide  or combine the  outstanding  shares of Common Stock into a greater or
lesser number of shares (any such sale,  issuance,  subdivision  or  combination
being  herein  called a "Change of  Shares"),  then,  and  thereafter  upon each
further Change of Shares, the Purchase Price in effect immediately prior to such
Change of Shares shall be changed to a price (including any applicable  fraction
of a cent)  determined by multiplying  the Purchase Price in effect  immediately
prior  thereto by a  fraction,  the  numerator  of which shall be the sum of the
number of shares of Common Stock  outstanding  immediately prior to the issuance
of such  additional  shares and the number of shares of Common  Stock  which the
aggregate  consideration  received (determined as provided in subsection 9(f)(F)
below) for the issuance of such  additional  shares would purchase at the Market
Price and the  denominator  of which shall be the sum of the number of shares of
Common  Stock  outstanding  immediately  after the  issuance of such  additional
shares. Such adjustment shall be made successively  whenever such an issuance is
made. For purposes of this Section 9, the  Calculation  Date shall mean the date
of the sale,  issuance,  modification or other  transaction  referred to in this
Section 9.

     Upon each  adjustment of the Purchase Price pursuant to this Section 9, the
total  number of shares of Common  Stock  purchasable  upon the exercise of each
Class A Warrant or the total number of shares of Common Stock  purchasable  upon
exercise  of  each  Class  B  Warrant,  as  applicable,  shall  (subject  to the
provisions   contained  in  Section  9(b)  hereof)  be  such  number  of  shares
(calculated to the nearest  one-hundredth;  provided,  however, that in no event
shall the Class A Aggregate  Per Share Price or the Class B Aggregate  Per Share
Price  as  applicable,  increase  as a  result  of  such  rounding  calculation)
purchasable at the Purchase Price in effect immediately prior to such adjustment
multiplied by a fraction,  the numerator of which shall be the Purchase Price in
effect

                                                                     
                                      -10-





immediately  prior to such  adjustment and the denominator of which shall be the
Purchase Price in effect immediately after such adjustment.

     (b) The  Company  may elect,  upon any  adjustment  of the  Purchase  Price
hereunder,  to  adjust  the  number  of Class A  Warrants  or  Class B  Warrants
outstanding,  in lieu of the  adjustment in the number of shares of Common Stock
purchasable upon the exercise of each Warrant as hereinabove  provided,  so that
each Class A Warrant outstanding after such adjustment shall represent the right
to purchase one share of Common Stock and one Class B Warrant,  and each Class B
Warrant  outstanding after such adjustment shall represent the right to purchase
one share of Common Stock.  Each Warrant held of record prior to such adjustment
of the number of Warrants  shall become that number of Warrants  (calculated  to
the nearest tenth)  determined by multiplying the number one by a fraction,  the
numerator of which shall be the Purchase  Price in effect  immediately  prior to
such  adjustment  and the  denominator  of which shall be the Purchase  Price in
effect immediately after such adjustment.  Upon each adjustment of the number of
Warrants  pursuant  to this  Section  9,  the  Company  shall,  as  promptly  as
practicable,  cause to be  distributed  to each  Registered  Holder  of  Warrant
Certificates on the date of such  adjustment  Warrant  Certificates  evidencing,
subject to Section 10 hereof,  the number of  additional  Warrants to which such
Holder shall be entitled as a result of such adjustment or, at the option of the
Company,  cause to be distributed to such Holder in substitution and replacement
for the Warrant  Certificates  held by him prior to the date of adjustment  (and
upon  surrender  thereof,  if required by the Company) new Warrant  Certificates
evidencing  the number of Warrants to which such Holder shall be entitled  after
such adjustment.

     (c) In case of any reclassification, capital reorganization or other change
of outstanding shares of Common Stock, or in case of any consolidation or merger
of the Company with or into another  corporation  (other than a consolidation or
merger in which the  Company is the  continuing  corporation  and which does not
result  in any  reclassification,  capital  reorganization  or other  change  of
outstanding  shares of Common  Stock),  or in case of any sale or  conveyance to
another  corporation of the property of the Company as, or substantially  as, an
entirety (other than a sale/leaseback, mortgage or other financing transaction),
the Company shall cause effective  provision to be made so that each holder of a
Warrant then  outstanding  shall have the right  thereafter,  by exercising such
Warrant,  to purchase the kind and number of shares of stock or other securities
or property  (including  cash)  receivable upon such  reclassification,  capital
reorganization or other change,  consolidation,  merger, sale or conveyance by a
holder of the number of shares of Common  Stock  that might have been  purchased
upon  exercise  of such  Warrant  immediately  prior  to such  reclassification,
capital  reorganization  or  other  change,   consolidation,   merger,  sale  or
conveyance.  Any such provision  shall include  provision for  adjustments  that
shall be as nearly equivalent as may be practicable to the adjustments  provided
for in this  Section 9. The  Company  shall not  effect any such  consolidation,
merger or sale unless prior to or simultaneously  with the consummation  thereof
the successor (if other than the Company)  resulting from such  consolidation or
merger or the corporation purchasing assets or other appropriate  corporation or
entity shall assume, by written instrument executed and delivered to the Warrant
Agent,  the  obligation  to deliver to the holder of each Warrant such shares of
stock,  securities  or assets as, in accordance  with the foregoing  provisions,
such  holders  may be  entitled to  purchase  and the other  obligations  of the
Company under
                                                                 
                                       -11





this  Agreement.  The foregoing  provisions  shall similarly apply to successive
reclassifications,  capital  reorganizations  and other  changes of  outstanding
shares  of Common  Stock and to  successive  consolidations,  mergers,  sales or
conveyances.

     (d) Irrespective of any adjustments or changes in the Purchase Price or the
number of shares of Common Stock purchasable upon exercise of the Warrants,  the
Warrant Certificates theretofore and thereafter issued shall, unless the Company
shall exercise its option to issue new Warrant Certificates  pursuant to Section
2(f)  hereof,  continue to express the Purchase  Price per share,  the number of
shares purchasable  thereunder and the Redemption Price therefor as the Purchase
Price per share,  and the number of shares  purchasable and the Redemption Price
therefor  were  expressed  in  the  Warrant  Certificates  when  the  same  were
originally issued.

     (e) After each adjustment of the Purchase Price pursuant to this Section 9,
the  Company  will  promptly  prepare a  certificate  signed by the  Chairman or
President, and by the Treasurer or an Assistant Treasurer or the Secretary or an
Assistant Secretary,  of the Company setting forth: (i) the Purchase Price as so
adjusted, (ii) the number of shares of Common Stock purchasable upon exercise of
each Warrant  after such  adjustment  and, if the Company  shall have elected to
adjust the number of  Warrants,  the number of Warrants to which the  Registered
Holder of each Warrant shall then be entitled,  and the adjustment in Redemption
Price resulting therefrom, and (iii) a statement showing in detail the method of
calculation  and the facts upon which such  adjustment or readjustment is based,
including a statement of (a) the consideration received or to be received by the
Company for any securities issued or sold or deemed to have been issued, (b) the
number of shares of Common Stock  outstanding or deemed to be  outstanding,  and
(c) the Purchase Price in effect  immediately prior to such issue or sale and as
adjusted  and  readjusted  (if  required by Section 9) on account  thereof.  The
Company will promptly file such certificate with the Warrant Agent and furnish a
copy thereof to be sent by ordinary first class mail to the  Underwriter  and to
each Registered Holder of Warrants at his last address as it shall appear on the
registry  books of the  Warrant  Agent.  No failure to mail such  notice nor any
defect  therein or in the mailing  thereof  shall  affect the  validity  thereof
except as to the  holder to whom the  Company  failed  to mail such  notice,  or
except as to the holder whose notice was defective.  The Company will,  upon the
written  request at any time of the  Underwriter,  furnish to the  Underwriter a
report  by  Richard  A.  Eisner  &  Company  LLP,  or other  independent  public
accountants of recognized  national  standing (which may be the regular auditors
of the Company)  selected by the Company to verify such  computation and setting
forth  such  adjustment  or  readjustment  and  showing  in detail the method of
calculation  and the facts upon which such  adjustment or readjustment is based.
The Company  will also keep copies of all such  certificates  and reports at its
principal office.

     (f) For purposes of Section 9(a) and 9(b) hereof, the following  provisions
(A) to (G) shall also be applicable:

          (A) The number of shares of Common Stock outstanding at any given time
     shall include shares of Common Stock owned or held by or for the account of
     the  Company  and the  sale or  issuance  of such  treasury  shares  or the
     distribution of any
                                                                         
                                        -12-





     such  treasury  shares  shall not be  considered  a Change  of  Shares  for
     purposes of said sections.

          (B) No  adjustment  of the  Purchase  Price  shall be made unless such
     adjustment  would  require an  increase or decrease of at least $.10 in the
     Purchase  Price;  provided  that any  adjustments  which by  reason of this
     clause (B) are not  required to be made shall be carried  forward and shall
     be made at the time of and  together  with the next  subsequent  adjustment
     which, together with any adjustment(s) so carried forward, shall require an
     increase or decrease of at least $.10 in the Purchase  Price then in effect
     hereunder.

          (C) In case of (1) the sale by the Company for cash (or as a component
     of a unit being sold for cash) of any rights or warrants to  subscribe  for
     or  purchase,  or any  options for the  purchase  of,  Common  Stock or any
     securities  convertible  into or exchangeable  for Common Stock without the
     payment  of any  further  consideration  other  than  cash,  if  any  (such
     securities convertible, exercisable or exchangeable into Common Stock being
     herein  called  "Convertible  Securities"),  or  (2)  the  issuance  by the
     Company,  without the receipt by the Company of any consideration therefor,
     of any rights or warrants to subscribe for or purchase,  or any options for
     the purchase of, Common Stock or Convertible  Securities,  in each case, if
     (and only if) the consideration payable to the Company upon the exercise of
     such rights, warrants or options shall consist of cash, whether or not such
     rights,  warrants  or  options,  or the right to convert or  exchange  such
     Convertible  Securities,  are  immediately  exercisable,  and the price per
     share for which Common Stock is issuable  upon the exercise of such rights,
     warrants or options or upon the conversion or exchange of such  Convertible
     Securities (determined by dividing (x) the minimum aggregate  consideration
     payable to the  Company  upon the  exercise  of such  rights,  warrants  or
     options,  plus the  consideration,  if any, received by the Company for the
     issuance or sale of such rights,  warrants or options, plus, in the case of
     such  Convertible  Securities,  the minimum  aggregate amount of additional
     consideration,  other than such  Convertible  Securities,  payable upon the
     conversion or exchange  thereof,  by (y) the total maximum number of shares
     of Common Stock  issuable  upon the  exercise of such  rights,  warrants or
     options or upon the conversion or exchange of such  Convertible  Securities
     issuable  upon the  exercise of such  rights,  warrants or options) is less
     than the  Market  Price on the  Calculation  Date,  then the total  maximum
     number of shares of Common Stock issuable upon the exercise of such rights,
     warrants or options or upon the conversion or exchange of such  Convertible
     Securities (as of the date of the issuance or sale of such rights, warrants
     or options)  shall be deemed to be  outstanding  shares of Common Stock for
     purposes of Sections  9(a) and 9(b) hereof and shall be deemed to have been
     sold for cash in an amount equal to such price per share.

          (D) In case of the sale by the  Company  for  cash of any  Convertible
     Securities,  whether or not the right of conversion or exchange  thereunder
     is
                                                             
                                      -13-





     immediately exercisable,  and the price per share for which Common Stock is
     issuable  upon the  conversion or exchange of such  Convertible  Securities
     (determined by dividing (x) the total amount of  consideration  received by
     the Company for the sale of such Convertible  Securities,  plus the minimum
     aggregate  amount of  additional  consideration,  if any,  other  than such
     Convertible Securities, payable upon the conversion or exchange thereof, by
     (y) the total  maximum  number of shares of Common Stock  issuable upon the
     conversion  or exchange of such  Convertible  Securities)  is less than the
     Market Price on the  Calculation  Date,  then the total  maximum  number of
     shares of Common Stock  issuable  upon the  conversion  or exchange of such
     Convertible  Securities  (as of the  date of the  sale of such  Convertible
     Securities)  shall be deemed to be  outstanding  shares of Common Stock for
     purposes of Sections  9(a) and 9(b) hereof and shall be deemed to have been
     sold for cash in an amount equal to such price per share.

          (E) In case  the  Company  shall  modify  the  rights  of  conversion,
     exchange  or exercise  of any of the  securities  referred to in (C) or (D)
     above or any other securities of the Company  convertible,  exchangeable or
     exercisable for shares of Common Stock,  for any reason other than an event
     that  would   require   adjustment  to  prevent   dilution,   so  that  the
     consideration  per share received by the Company after such modification is
     less than the Market Price on the  Calculation  Date, the Purchase Price to
     be in effect after such modification shall be determined by multiplying the
     Purchase Price in effect immediately prior to such event by a fraction,  of
     which  the  numerator  shall  be the  number  of  shares  of  Common  Stock
     outstanding on the date prior to the modification plus the number of shares
     of Common Stock which the aggregate consideration receivable by the Company
     for the  securities  affected  by the  modification  would  purchase at the
     Market Price and of which the denominator  shall be the number of shares of
     Common Stock  outstanding  on such date plus the number of shares of Common
     Stock to be issued upon  conversion,  exchange or exercise of the  modified
     securities at the modified rate. Such adjustment  shall become effective as
     of the  date  upon  which  such  modification  shall  take  effect.  On the
     expiration of any such right,  warrant or option or the  termination of any
     such right to convert or exchange any such Convertible  Securities referred
     to in  Paragraph  (C) or (D)  above,  the  Purchase  Price  then in  effect
     hereunder  shall  forthwith be readjusted  to such Purchase  Price as would
     have  obtained  (a) had the  adjustments  made upon the issuance or sale of
     such rights, warrants, options or Convertible Securities been made upon the
     basis  of the  issuance  of only the  number  of  shares  of  Common  Stock
     theretofore  actually  delivered  (and  the  total  consideration  received
     therefor) upon the exercise of such rights, warrants or options or upon the
     conversion  or  exchange  of  such  Convertible   Securities  and  (b)  had
     adjustments  been made on the basis of the Purchase Price as adjusted under
     clause (a) for all  transactions  (which would have  affected such adjusted
     Purchase  Price) made after the issuance or sale of such rights,  warrants,
     options or Convertible Securities.

                                                                               
                                      -14-





          (F) In case of the sale for cash of any  shares of Common  Stock,  any
     Convertible  Securities,  any  rights  or  warrants  to  subscribe  for  or
     purchase,  or any options for the purchase of, Common Stock or  Convertible
     Securities,  the  consideration  received by the Company therefore shall be
     deemed to be the gross sales price therefor without deducting therefrom any
     expense  paid or incurred by the Company or any  underwriting  discounts or
     commissions  or  concessions  paid or allowed by the Company in  connection
     therewith.

          (G) In case  any  event  shall  occur as to which  the  provisions  of
     Section  9 are  not  strictly  applicable  but  the  failure  to  make  any
     adjustment would not fairly protect the purchase rights  represented by the
     Warrants in accordance with the essential  intent and principles of Section
     9, then, in each such case,  the Board of Directors of the Company shall in
     good faith by  resolution  provide for the  adjustment,  if any, on a basis
     consistent with the essential intent and principles  established in Section
     9, necessary to preserve, without dilution, the purchase rights represented
     by the Warrants.  The Company will promptly make the adjustments  described
     therein.

     (g) No adjustment to the Purchase Price of the Warrants or to the number of
shares of Common  Stock  purchasable  upon the  exercise of each Warrant will be
made, however,

          (i)  upon the  exercise  of any of the  options  presently  issued  to
     Deborah E. Griffin and Steven R. Gumins, or outstanding under the Company's
     Stock Option Plan (the "Plan") for  officers,  directors  and certain other
     key personnel of the Company; or

          (ii) upon the issuance or exercise of any other  securities  which may
     hereafter  be  granted  or  exercised  under  the Plan or under  any  other
     employee   benefit   plan  of  the  Company   approved  by  the   Company's
     stockholders; or

          (iii) upon the sale or exercise  of the  Warrants,  including  without
     limitation the sale or exercise of any of the Warrants  comprising the Unit
     Purchase  Option or upon the sale or exercise of the Unit Purchase  Option;
     or

          (iv) upon the sale of any shares of Common  Stock  and/or  Convertible
     Securities in a firm commitment  underwritten  public offering,  including,
     without  limitation,  shares sold upon the  exercise  of any  overallotment
     option granted to the underwriters in connection with such offering; or

          (v) upon the sale by the Company of any shares of Common  Stock and/or
     Convertible  Securities in a private placement for which the Underwriter is
     the Placement Agent; or

                                      -15-





          (vi)  upon  the  issuance  or  sale of  Common  Stock  or  Convertible
     Securities  upon the exercise of any rights or warrants to subscribe for or
     purchase,  or any options for the purchase of, Common Stock or  Convertible
     Securities,   whether  or  not  such  rights,   warrants  or  options  were
     outstanding  on the  date  of the  original  sale of the  Warrants  or were
     thereafter issued or sold; or

          (vii) upon the  issuance or sale of Common  Stock upon  conversion  or
     exchange of any  Convertible  Securities,  whether or not any adjustment in
     the  Purchase  Price was made or required  to be made upon the  issuance or
     sale of such  Convertible  Securities  and whether or not such  Convertible
     Securities  were  outstanding  on the  date  of the  original  sale  of the
     Warrants or were thereafter issued or sold.

     (h) As used in this  Section  9, the term  "Common  Stock"  shall  mean and
include the Company's  Common Stock authorized on the date of the original issue
of the  Units and  shall  also  include  any  capital  stock of any class of the
Company  thereafter  authorized  which  shall not be  limited  to a fixed sum or
percentage  in respect of the rights of the holders  thereof to  participate  in
dividends  and in the  distribution  of assets upon the  voluntary  liquidation,
dissolution  or winding up of the Company;  provided,  however,  that the shares
issuable upon  exercise of the Warrants  shall include only shares of such class
designated in the Company's  Certificate of Incorporation as Common Stock on the
date  of  the  original  issue  of  the  Units  or  (i),  in  the  case  of  any
reclassification,  change,  consolidation,  merger,  sale or  conveyance  of the
character referred to in Section 9(c) hereof, the stock,  securities or property
provided for in such  section or (ii),  in the case of any  reclassification  or
change in the  outstanding  shares of Common Stock issuable upon exercise of the
Warrants as a result of a subdivision  or  combination or consisting of a change
in par  value,  or from par value to no par  value,  or from no par value to par
value, such shares of Common Stock as so reclassified or changed.

     (i) Any  determination as to whether an adjustment in the Purchase Price in
effect  hereunder is required  pursuant to Section 9, or as to the amount of any
such adjustment,  if required, shall be binding upon the holders of the Warrants
and the Company if made in good faith by the Board of Directors of the Company.

     (j) If and whenever the Company shall grant to the holders of Common Stock,
as such, rights or warrants to subscribe for or to purchase,  or any options for
the purchase of, Common Stock or securities convertible into or exchangeable for
or carrying a right,  warrant or option to purchase  Common  Stock,  the Company
shall  concurrently  therewith grant to each Registered  Holder as of the record
date for such transaction of the Warrants then outstanding, the rights, warrants
or options to which each  Registered  Holder would have been entitled if, on the
record date used to determine the stockholders entitled to the rights,  warrants
or options being granted by the Company,  the Registered  Holder were the holder
of record of the  number of whole  shares of Common  Stock  then  issuable  upon
exercise (assuming, for purposes of this Section 9(j), that exercise of Warrants
is permissible during periods prior to the Initial Warrant Exercise Date) of
                                                                
                                      -16-





his Warrants.  Such grant by the Company to the holders of the Warrants shall be
in lieu of any adjustment  which  otherwise might be called for pursuant to this
Section 9.


     SECTION 10. Fractional Warrants and Fractional Shares.

     (a) If the number of shares of Common Stock  purchasable  upon the exercise
of  each  Warrant  is  adjusted  pursuant  to  Section  9  hereof,  the  Company
nevertheless  shall not be required to issue fractions of shares,  upon exercise
of the  Warrants or  otherwise,  or to  distribute  certificates  that  evidence
fractional  shares.  With respect to any fraction of a share called for upon the
exercise of any Warrant,  the Company  shall pay to the Holder an amount in cash
equal to such fraction multiplied by the current market value of such fractional
share, determined as follows:

          (1) If the Common Stock is listed on a national securities exchange or
     admitted to unlisted  trading  privileges  on such exchange or is traded on
     the Nasdaq  National  Market,  the current  market  value shall be the last
     reported  sale price of the Common Stock on such  exchange or market on the
     last  business  day prior to the date of exercise of this  Warrant or if no
     such sale is made on such day,  the  average of the  closing  bid and asked
     prices for such day on such exchange or market; or

          (2) If the Common Stock is not listed or admitted to unlisted  trading
     privileges on a national securities exchange or is not traded on the Nasdaq
     National  Market,  the current  market  value shall be the mean of the last
     reported bid and asked prices reported by the Nasdaq SmallCap Market or, if
     not traded  thereon,  by the National  Quotation  Bureau,  Inc. on the last
     business day prior to the date of the exercise of this Warrant; or

          (3) If the  Common  Stock is not so listed  or  admitted  to  unlisted
     trading  privileges  and bid and  asked  prices  are not so  reported,  the
     current  market  value  shall be an amount  determined  in such  reasonable
     manner as may be prescribed by the Board of Directors of the Company.

     SECTION 11. Warrant Holders Not Deemed Stockholders.  No holder of Warrants
shall,  as such,  be entitled to vote or to receive  dividends  or be deemed the
holder of Common  Stock that may at any time be issuable  upon  exercise of such
Warrants for any purpose  whatsoever,  nor shall  anything  contained  herein be
construed to confer upon the holder of Warrants, as such, any of the rights of a
stockholder of the Company or any right to vote for the election of directors or
upon any matter submitted to stockholders at any meeting thereof,  or to give or
withhold  consent to any corporate  action  (whether upon any  recapitalization,
issue or reclassification of stock, change of par value or change of stock to no
par value,  consolidation,  merger or  conveyance or  otherwise),  or to receive
notice of meetings,  or to receive dividends or subscription  rights, until such
holder shall have exercised such Warrants and been issued shares of Common Stock
in accordance with the provisions hereof.

                                      -17-






     SECTION 12.  Rights of Action.  All rights of action  with  respect to this
Agreement are vested in the respective  Registered Holders of the Warrants,  and
any Registered  Holder of a Warrant,  without consent of the Warrant Agent or of
the holder of any other Warrant, may, in his own behalf and for his own benefit,
enforce  against the Company his right to exercise his Warrants for the purchase
of shares of Common Stock in the manner provided in the Warrant  Certificate and
this Agreement.

     SECTION 13. Agreement of Warrant Holders. Every holder of a Warrant, by his
acceptance thereof,  consents and agrees with the Company, the Warrant Agent and
every other holder of a Warrant that:

     (a) The Warrants are transferable only on the registry books of the Warrant
Agent by the  Registered  Holder  thereof  in  person  or by his  attorney  duly
authorized  in writing and only if the Warrant  Certificates  representing  such
Warrants are  surrendered at the office of the Warrant  Agent,  duly endorsed or
accompanied by a proper instrument of transfer satisfactory to the Warrant Agent
and  the  Company  in  their  sole  discretion,  together  with  payment  of any
applicable transfer taxes; and

     (b) The  Company  and the  Warrant  Agent may deem and treat the  person in
whose  name the  Warrant  Certificate  is  registered  as the  holder and as the
absolute,  true and lawful  owner of the  Warrants  represented  thereby for all
purposes, and neither the Company nor the Warrant Agent shall be affected by any
notice or knowledge to the contrary,  except as otherwise  expressly provided in
Section 7 hereof.

     SECTION 14.  Cancellation  of Warrant  Certificates.  If the Company  shall
purchase or acquire any Warrant or Warrants,  the Warrant Certificate or Warrant
Certificates  evidencing  the same shall  thereupon  be delivered to the Warrant
Agent and  cancelled by it and retired.  The Warrant Agent shall also cancel the
Warrant Certificate or Warrant Certificates  following exercise of any or all of
the Warrants represented thereby or delivered to it for transfer or exchange.

     SECTION 15.  Concerning the Warrant Agent. The Warrant Agent acts hereunder
as agent and in a ministerial  capacity for the Company, and its duties shall be
determined  solely by the  provisions  hereof.  The Warrant  Agent shall not, by
issuing and  delivering  Warrant  Certificates  or by any other act hereunder be
deemed to make any representations as to the validity, value or authorization of
the  Warrant  Certificates  or  the  Warrants  represented  thereby  or  of  any
securities or other  property  delivered upon exercise of any Warrant or whether
any stock issued upon exercise of any Warrant is fully paid and nonassessable.

     The Warrant Agent shall not at any time be under any duty or responsibility
to any holder of Warrant Certificates to make or cause to be made any adjustment
of the Purchase Price or the Redemption Price provided in this Agreement,  or to
determine  whether any fact exists  which may require any such  adjustments,  or
with respect to the nature or extent of any such adjustment,  when made, or with
respect to the method employed in making the same. It shall not


                                      -18-





(i) be liable for any recital or statement of facts contained  herein or for any
action taken,  suffered or omitted by it in reliance on any Warrant  Certificate
or other  document or instrument  believed by it in good faith to be genuine and
to have  been  signed or  presented  by the  proper  party or  parties,  (ii) be
responsible for any failure on the part of the Company to comply with any of its
covenants  and  obligations  contained  in  this  Agreement  or in  any  Warrant
Certificate,  or (iii) be liable for any act or omission in connection with this
Agreement except for its own negligence or wilful misconduct.

     The Warrant Agent may at any time consult with counsel  satisfactory  to it
(who  may  be  counsel  for  the  Company)  and  shall  incur  no  liability  or
responsibility for any action taken,  suffered or omitted by it in good faith in
accordance with the opinion or advice of such counsel.

     Any notice, statement,  instruction, request, direction, order or demand of
the Company  shall be  sufficiently  evidenced  by an  instrument  signed by the
Chairman  of the  Board,  President,  any  Vice  President,  its  Secretary,  or
Assistant  Secretary,  (unless  other  evidence  in  respect  thereof  is herein
specifically  prescribed).  The Warrant Agent shall not be liable for any action
taken,  suffered or omitted by it in  accordance  with such  notice,  statement,
instruction, request, direction, order or demand believed by it to be genuine.

     The Company agrees to pay the Warrant Agent reasonable compensation for its
services hereunder and to reimburse it for its reasonable expenses hereunder; it
further  agrees to indemnify the Warrant Agent and save it harmless  against any
and all losses, expenses and liabilities, including judgments, costs and counsel
fees,  for anything done or omitted by the Warrant Agent in the execution of its
duties and powers hereunder except losses, expenses and liabilities arising as a
result of the Warrant Agent's negligence or wilful misconduct.

     The Warrant Agent may resign its duties and be discharged  from all further
duties and liabilities  hereunder (except liabilities arising as a result of the
Warrant  Agent's own  negligence  or wilful  misconduct),  after giving 30 days'
prior  written  notice to the  Company.  At least 15 days prior to the date such
resignation is to become effective, the Warrant Agent shall cause a copy of such
notice of  resignation  to be mailed to the  Registered  Holder of each  Warrant
Certificate at the Company's expense. Upon such resignation, or any inability of
the Warrant  Agent to act as such  hereunder,  the Company  shall  appoint a new
warrant  agent in writing.  If the Company  shall fail to make such  appointment
within  a  period  of 15 days  after it has been  notified  in  writing  of such
resignation by the resigning  Warrant Agent,  then the Registered  Holder of any
Warrant  Certificate  may apply to any court of competent  jurisdiction  for the
appointment of a new warrant agent. Any new warrant agent,  whether appointed by
the  Company  or by such a  court,  shall be a bank or  trust  company  having a
capital and surplus,  as shown by its last published report to its stockholders,
of not less than  $10,000,000 or a stock  transfer  company that is a registered
transfer agent under the Securities  Exchange Act of 1934.  After  acceptance in
writing of such appointment by the new warrant agent is received by the Company,
such new warrant agent shall be vested with the same powers,  rights, duties and
responsibilities as if it had been originally named herein as the Warrant Agent,
without any further assurance, conveyance, act or deed; but if for any reason it
shall be



                                      -19-





necessary or expedient to execute and deliver any further assurance, conveyance,
act or deed,  the same shall be done at the  expense of the Company and shall be
legally and validly  executed and delivered by the resigning  Warrant Agent. Not
later than the  effective  date of any such  appointment  the Company shall file
notice thereof with the resigning Warrant Agent and shall forthwith cause a copy
of  such  notice  to  be  mailed  to  the  Registered  Holder  of  each  Warrant
Certificate.

     Any  corporation  into which the Warrant Agent or any new warrant agent may
be converted or merged or any corporation  resulting from any  consolidation  to
which  the  Warrant  Agent  or any new  warrant  agent  shall  be a party or any
corporation  succeeding  to the trust  business of the Warrant  Agent shall be a
successor  warrant agent under this Agreement  without any further act, provided
that such  corporation  is eligible for  appointment as successor to the Warrant
Agent  under the  provisions  of the  preceding  paragraph.  Any such  successor
warrant agent shall  promptly cause notice of its succession as warrant agent to
be  mailed  to  the  Company  and to  the  Registered  Holder  of  each  Warrant
Certificate.

     The Warrant Agent, its subsidiaries and affiliates, and any of its or their
officers or directors,  may buy and hold or sell Warrants or other securities of
the  Company and  otherwise  deal with the Company in the same manner and to the
same extent and with like effects as though it were not Warrant  Agent.  Nothing
herein shall  preclude the Warrant  Agent from acting in any other  capacity for
the Company or for any other legal entity.

     SECTION 16. Modification of Agreement. Subject to the provisions of Section
4(b), the parties hereto and the Company may by supplemental  agreement make any
changes or corrections in this Agreement (i) that they shall deem appropriate to
cure any  ambiguity  or to correct any  defective or  inconsistent  provision or
manifest mistake or error herein  contained;  (ii) to reflect an increase in the
number of Class A or Class B Warrants which are to be governed by this Agreement
resulting  from (a) a subsequent  public  offering of Company  securities  which
includes  Class A or Class B Warrants or (b) a subsequent  private  placement of
Company  securities  which includes Class A or Class B Warrants,  in either case
having  the same  terms  and  conditions  as the  Class A or  Class B  Warrants,
respectively,  originally  covered by or  subsequently  added to this  Agreement
under  this  Section  16,  provided,  however,  that in the  case  of a  private
placement,  the amendment to this  Agreement will be effective only at such time
as the  resale  of such  Warrants,  as well as the  securities  underlying  such
Warrants is covered by an  effective  registration  statement  under the Act; or
(iii) that they may deem  necessary or desirable  and which shall not  adversely
affect the interests of the holders of Warrant Certificates;  provided, however,
that this Agreement shall not otherwise be modified,  supplemented or altered in
any  respect  except with the  consent in writing of the  Registered  Holders of
Warrant  Certificates  representing  not  less  than  50% of the  Warrants  then
outstanding;  and provided,  further,  that no change in the number or nature of
the  securities  purchasable  upon the exercise of any Warrant,  or the Purchase
Price therefor,  or the  acceleration of the Warrant  Expiration  Date, shall be
made  without  the  consent in writing of the  Registered  Holder of the Warrant
Certificate   representing  such  Warrant,   other  than  such  changes  as  are
specifically  prescribed by this Agreement as originally executed or are made in
compliance with applicable law.


                                      -20-






     SECTION  17.   Notices.   All   notices,   requests,   consents  and  other
communications  hereunder  shall be in writing  and shall be deemed to have been
made when delivered or mailed first class registered or certified mail,  postage
prepaid as follows: if to the Registered Holder of a Warrant Certificate, at the
address of such holder as shown on the registry books  maintained by the Warrant
Agent; if to the Company, at 17575 Pacific Coast Highway,  Pacific Palisades, CA
90272, attention:  Deborah E. Griffin, or at such other address as may have been
furnished  to the  Warrant  Agent in writing by the  Company;  if to the Warrant
Agent, at its Corporate Office; if to the Underwriter,  at D.H. Blair Investment
Banking Corp., 44 Wall Street, New York, New York 10005.

     SECTION  18.  Governing  Law.  This  Agreement  shall  be  governed  by and
construed  in  accordance  with  the  laws of the  State  of New  York,  without
reference to principles of conflict of laws.

     SECTION 19. Binding Effect.  This Agreement shall be binding upon and inure
to the  benefit of the  Company  and,  the  Warrant  Agent and their  respective
successors  and  assigns,   and  the  holders  from  time  to  time  of  Warrant
Certificates  . Nothing in this  Agreement  is intended or shall be construed to
confer upon any other person any right, remedy or claim, in equity or at law, or
to impose upon any other person any duty, liability or obligation.

     SECTION 20.  Termination.  This Agreement  shall  terminate at the close of
business on the earlier of the  Warrant  Expiration  Date or the date upon which
all Warrants (including the warrants issuable upon exercise of the Unit Purchase
Options) have been exercised, except that the Warrant Agent shall account to the
Company  for cash held by it and the  provisions  of  Section  15  hereof  shall
survive such termination.


                                      -21-





     SECTION  21.  Counterparts.  This  Agreement  may be  executed  in  several
counterparts, which taken together shall constitute a single document.

     IN WITNESS  WHEREOF,  the parties  hereto have caused this  Agreement to be
duly executed as of the date first above written.

                                   HEURISTIC DEVELOPMENT GROUP, INC.

                                   By: __________________________________


                                   AMERICAN STOCK TRANSFER & TRUST COMPANY

                                            By:  ____________________________
                                                     Authorized Officer


                                            D.H.  BLAIR INVESTMENT BANKING CORP.


                                            By   ______________________________
                                                     Authorized Officer



                                                                        
                                      -22-







                                    EXHIBIT A

                  [FORM OF FACE OF CLASS A WARRANT CERTIFICATE]


No.  AW                                               _________ Class A Warrants


                          VOID AFTER ____________, 2002

                    CLASS A WARRANT CERTIFICATE FOR PURCHASE
                 OF COMMON STOCK AND REDEEMABLE CLASS B WARRANTS

                        HEURISTIC DEVELOPMENT GROUP, INC.


     This  certifies that FOR VALUE  RECEIVED  __________________  or registered
assigns (the "Registered Holder") is the owner of the number of Class A Warrants
("Class A Warrants")  specified above. Each Class A Warrant  represented  hereby
initially  entitles the Registered Holder to purchase,  subject to the terms and
conditions set forth in this Warrant  Certificate and the Warrant  Agreement (as
hereinafter  defined),  one fully paid and nonassessable  share of Common Stock,
$.01 par value  ("Common  Stock"),  of  Heuristic  Development  Group,  Inc.,  a
Delaware corporation (the "Company"),  and one Class B Warrant of the Company at
any time between ______, 1997 and the Expiration Date (as hereinafter  defined),
upon  the  presentation  and  surrender  of this  Warrant  Certificate  with the
Subscription  Form on the reverse hereof duly executed,  at the corporate office
of American Stock  Transfer & Trust Company as Warrant  Agent,  or its successor
(the "Warrant Agent"), accompanied by payment of $6.50 (the "Purchase Price") in
lawful  money of the United  States of America  in cash or by  official  bank or
certified check made payable to Heuristic Development Group, Inc.

     This Warrant  Certificate and each Class A Warrant  represented  hereby are
issued  pursuant to and are subject in all respects to the terms and  conditions
set forth in the Warrant Agreement (the "Warrant  Agreement"),  dated ____, 1997
by and among the Company,  the Warrant Agent and D.H. Blair  Investment  Banking
Corp.

     In  the  event  of  certain  contingencies  provided  for  in  the  Warrant
Agreement,  the Purchase Price or the number of shares of Common Stock and Class
B  Warrants  subject  to  purchase  upon the  exercise  of each  Class A Warrant
represented hereby are subject to modification or adjustment.



                                       A-1





     Each Class A Warrant represented hereby is exercisable at the option of the
Registered  Holder,  but no fractional shares of Common Stock will be issued. In
the case of the  exercise  of less  than all the  Class A  Warrants  represented
hereby,  the Company  shall cancel this Warrant  Certificate  upon the surrender
hereof  and shall  execute  and  deliver a new  Warrant  Certificate  or Warrant
Certificates of like tenor, which the Warrant Agent shall  countersign,  for the
balance of such Class A Warrants.

     The term  "Expiration  Date"  shall  mean  5:00  P.M.  (New  York  time) on
____,2002,  or such earlier date as the Class A Warrants  shall be redeemed.  If
such date  shall in the State of New York be a holiday  or a day on which  banks
are authorized to close, then the Expiration Date shall mean 5:00 P.M. (New York
time) the next  following day which in the State of New York is not a holiday or
a day on which banks are authorized to close.

     The Company  shall not be obligated to deliver any  securities  pursuant to
the exercise of the Class A Warrants  represented  hereby unless a  registration
statement  under the  Securities  Act of 1933, as amended,  with respect to such
securities is effective. The Company has covenanted and agreed that it will file
a  registration  statement  and will use its best  efforts  to cause the same to
become effective and to keep such  registration  statement  current while any of
the Class A Warrants are outstanding.  The Class A Warrants  represented  hereby
shall not be exercisable by a Registered Holder in any state where such exercise
would be unlawful.

     This Warrant Certificate is exchangeable,  upon the surrender hereof by the
Registered  Holder at the  corporate  office  of the  Warrant  Agent,  for a new
Warrant Certificate or Warrant  Certificates of like tenor representing an equal
aggregate number of Class A Warrants,  each of such new Warrant  Certificates to
represent  such  number  of Class A  Warrants  as shall  be  designated  by such
Registered  Holder at the time of such surrender.  Upon due presentment with a $
transfer fee per certificate in addition to any tax or other governmental charge
imposed in connection  therewith,  for  registration of transfer of this Class A
Warrant  Certificate  at such  office,  a new  Warrant  Certificate  or  Warrant
Certificates  representing an equal aggregate number of Class A Warrants will be
issued to the  transferee  in  exchange  therefor,  subject  to the  limitations
provided in the Warrant Agreement.

     Prior to the  exercise  of any  Class A  Warrant  represented  hereby,  the
Registered  Holder shall not be entitled to any rights of a  stockholder  of the
Company,  including,  without  limitation,  the  right  to  vote  or to  receive
dividends  or other  distributions,  and shall not be  entitled  to receive  any
notice of any  proceedings  of the  Company,  except as  provided in the Warrant
Agreement.

     The Class A Warrants  represented  hereby may be  redeemed at the option of
the Company, at a redemption price of $.05 per Class A Warrant at any time after
, 1998 provided the Market Price (as defined in the Warrant  Agreement)  for the
Common Stock shall exceed $9.10 per share.  Notice of redemption  shall be given
not later than the  thirtieth day before the date fixed for  redemption,  all as
provided in the Warrant  Agreement.  On and after the date fixed for redemption,
the Registered Holder shall have no rights with respect to the Class A Warrants


                                       A-2




represented hereby except to receive the $.05 per Class A Warrant upon surrender
of this Warrant Certificate.

     Prior to due presentment for registration of transfer  hereof,  the Company
and the Warrant Agent may deem and treat the  Registered  Holder as the absolute
owner hereof and of each Class A Warrant represented hereby (notwithstanding any
notations  of  ownership  or  writing  hereon  made by anyone  other than a duly
authorized  officer of the Company or the Warrant  Agent) for all  purposes  and
shall not be affected by any notice to the contrary.

     The  Company  has  agreed  to pay a fee of 5% of the  Purchase  Price  upon
certain  conditions as specified in the Warrant  Agreement  upon the exercise of
the Class A Warrants represented hereby.

     This Warrant  Certificate  shall be governed by and construed in accordance
with the laws of the State of New York.

     This Warrant  Certificate is not valid unless  countersigned by the Warrant
Agent.

     IN WITNESS WHEREOF,  the Company has caused this Warrant  Certificate to be
duly executed,  manually or in facsimile,  by two of its officers thereunto duly
authorized and a facsimile of its corporate seal to be imprinted hereon.

                                         HEURISTIC DEVELOPMENT GROUP, INC.

Dated: ________                          By:     ______________________________


                                         By:     ______________________________

[seal]

Countersigned:

AMERICAN STOCK TRANSFER & TRUST COMPANY
            as Warrant Agent


By    ___________________________
          Authorized Officer



                                       A-3






                    [FORM OF REVERSE OF WARRANT CERTIFICATE]

                  TRANSFER FEE: $_______ PER CERTIFICATE ISSUED

                                SUBSCRIPTION FORM

                     To Be Executed by the Registered Holder
                          in Order to Exercise Warrants


     The undersigned  Registered  Holder hereby  irrevocably  elects to exercise
_______  Class A  Warrants  represented  by  this  Warrant  Certificate,  and to
purchase the securities issuable upon the exercise of such Class A Warrants, and
requests that certificates for such securities shall be issued in the name of

            PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER

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

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

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

                              --------------------
                     [please print or type name and address]


and be delivered to

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

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

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

                              --------------------
                     [please print or type name and address]


and if such  number of Class A  Warrants  shall not be all the Class A  Warrants
evidenced by this Warrant  Certificate,  that a new Class A Warrant  Certificate
for the  balance  of such  Class A Warrants  be  registered  in the name of, and
delivered to, the Registered Holder at the address stated below.


                                       A-4





     The  undersigned  represents  that the  exercise  of the  Class A  Warrants
evidenced  hereby  was  solicited  by a member of the  National  Association  of
Securities  Dealers,  Inc. If not  solicited  by an NASD  member,  please  write
"unsolicited" in the space below. Unless otherwise indicated by listing the name
of another NASD member firm,  it will be assumed that the exercise was solicited
by D.H. Blair Investment Banking Corp. or D.H. Blair & Co., Inc.


                                    ------------------------------------
                                             (Name of NASD Member)


Dated:                          X       ---------------------------------------
      ---------
                                    ------------------------------------

                                    ------------------------------------
                                                      Address


                                    ------------------------------------
                                             Taxpayer Identification Number


                                    ------------------------------------
                                             Signature Guaranteed


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






THE SIGNATURE TO THE ASSIGNMENT OR THE SUBSCRIPTION  FORM MUST CORRESPOND TO THE
NAME AS WRITTEN UPON THE FACE OF THIS WARRANT  CERTIFICATE IN EVERY  PARTICULAR,
WITHOUT  ALTERATION  OR  ENLARGE-  MENT OR ANY  CHANGE  WHATSOEVER,  AND MUST BE
GUARANTEED BY A MEMBER OF THE MEDALLION STAMP PROGRAM.


                                       A-5





                                   ASSIGNMENT


                     To Be Executed by the Registered Holder
                           in Order to Assign Warrants


FOR VALUE RECEIVED, __________________  hereby sells, assigns and transfers unto


            PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER
                                  OF TRANSFEREE

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

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

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

                              --------------------
                     [please print or type name and address]


_________________   of  the  Class  A  Warrants   represented  by  this  Warrant
Certificate,     and    hereby    irrevocably     constitutes    and    appoints
____________________________________   Attorney   to   transfer   this   Warrant
Certificate on the books of the Company,  with full power of substitution in the
premises.


Dated:________________                 X        ______________________________
                                                     Signature Guaranteed


                                           ____________________________________


THE SIGNATURE TO THE ASSIGNMENT OR THE SUBSCRIPTION  FORM MUST CORRESPOND TO THE
NAME AS WRITTEN UPON THE FACE OF THIS WARRANT  CERTIFICATE IN EVERY  PARTICULAR,
WITHOUT  ALTERATION  OR  ENLARGE-  MENT OR ANY  CHANGE  WHATSOEVER,  AND MUST BE
GUARANTEED BY A MEMBER OF THE MEDALLION STAMP PROGRAM.




                                       A-6





                                    EXHIBIT B

                  [FORM OF FACE OF CLASS B WARRANT CERTIFICATE]


No.  BW                                                      __ Class B Warrants


                          VOID AFTER _____________ 2002

                         CLASS B WARRANT CERTIFICATE FOR
                            PURCHASE OF COMMON STOCK

                        HEURISTIC DEVELOPMENT GROUP, INC.

     This certifies that FOR VALUE RECEIVED  ____________________  or registered
assigns (the "Registered Holder") is the owner of the number of Class B Warrants
specified above. Each Class B Warrant  represented hereby initially entitles the
Registered Holder to purchase,  subject to the terms and conditions set forth in
this Warrant Certificate and the Warrant Agreement (as hereinafter defined), one
fully paid and  nonassessable  share of Common  Stock,  $.01 par value  ("Common
Stock"),  of Heuristic  Development  Group,  Inc., a Delaware  corporation  (the
"Company"),  at any  time  between  ____,  1997  and  the  Expiration  Date  (as
hereinafter  defined),  upon the  presentation  and  surrender  of this  Warrant
Certificate with the Subscription  Form on the reverse hereof duly executed,  at
the corporate office of American Stock Transfer Company as Warrant Agent, or its
successor (the "Warrant Agent"),  accompanied by payment of $8.75 (the "Purchase
Price") in lawful  money of the United  States of America in cash or by official
bank or certified check made payable to Heuristic Development Group, Inc.

     This Warrant  Certificate and each Class B Warrant  represented  hereby are
issued  pursuant to and are subject in all respects to the terms and  conditions
set forth in the Warrant Agreement (the "Warrant Agreement"), dated ___________,
1997 by and among the  Company,  the  Warrant  Agent and D.H.  Blair  Investment
Banking Corp.

     In  the  event  of  certain  contingencies  provided  for  in  the  Warrant
Agreement, the Purchase Price or the number of shares of Common Stock subject to
purchase  upon the  exercise  of each  Class B Warrant  represented  hereby  are
subject to modification or adjustment.

     Each Class B Warrant represented hereby is exercisable at the option of the
Registered  Holder,  but no fractional shares of Common Stock will be issued. In
the case of the  exercise  of less  than all the  Class B  Warrants  represented
hereby,  the Company  shall cancel this Warrant  Certificate  upon the surrender
hereof  and shall  execute  and  deliver a new  Warrant  Certificate  or Warrant
Certificates of like tenor, which the Warrant Agent shall  countersign,  for the
balance of such Class B Warrants.

                                                                        

                                       B-1





     The term "Expiration Date" shall mean 5:00 P.M. (New York time) on ______ ,
2002 or such  earlier date as the Class B Warrants  shall be  redeemed.  If such
date  shall in the  State of New York be a holiday  or a day on which  banks are
authorized  to close,  then the  Expiration  Date shall mean 5:00 P.M. (New York
time) the next  following day which in the State of New York is not a holiday or
a day on which banks are authorized to close.

     The Company  shall not be obligated to deliver any  securities  pursuant to
the exercise of the Class B Warrants  represented  hereby unless a  registration
statement  under the  Securities  Act of 1933, as amended,  with respect to such
securities is effective. The Company has covenanted and agreed that it will file
a  registration  statement  and will use its best  efforts  to cause the same to
become effective and to keep such  registration  statement  current while any of
the Class B Warrants are outstanding.  The Class B Warrants  represented  hereby
shall not be exercisable by a Registered Holder in any state where such exercise
would be unlawful.

     This Warrant Certificate is exchangeable,  upon the surrender hereof by the
Registered  Holder at the  corporate  office  of the  Warrant  Agent,  for a new
Warrant Certificate or Warrant  Certificates of like tenor representing an equal
aggregate number of Class B Warrants,  each of such new Warrant  Certificates to
represent  such  number  of Class B  Warrants  as shall  be  designated  by such
Registered  Holder at the time of such surrender.  Upon due presentment with any
applicable  transfer  fee in  addition to any tax or other  governmental  charge
imposed in connection  therewith,  for  registration of transfer of this Warrant
Certificate at such office,  a new Warrant  Certificate or Warrant  Certificates
representing an equal aggregate number of Class B Warrants will be issued to the
transferee  in exchange  therefor,  subject to the  limitations  provided in the
Warrant Agreement.

     Prior to the  exercise  of any  Class B  Warrant  represented  hereby,  the
Registered  Holder shall not be entitled to any rights of a  stockholder  of the
Company,  including,  without  limitation,  the  right  to  vote  or to  receive
dividends  or other  distributions,  and shall not be  entitled  to receive  any
notice of any  proceedings  of the  Company,  except as  provided in the Warrant
Agreement.

     The Class B Warrants  represented  hereby may be  redeemed at the option of
the Company, at a redemption price of $.05 per Class B Warrant at any time after
______, 1998 provided the Market Price (as defined in the Warrant Agreement) for
the Common Stock shall exceed $12.25 per share.  Notice of  redemption  shall be
given not later than the thirtieth day before the date fixed for redemption, all
as  provided  in the  Warrant  Agreement.  On  and  after  the  date  fixed  for
redemption, the Registered Holder shall have no rights with respect to the Class
B Warrants  represented  hereby  except to receive  the $.05 per Class B Warrant
upon surrender of this Warrant Certificate.

     Prior to due presentment for registration of transfer  hereof,  the Company
and the Warrant Agent may deem and treat the  Registered  Holder as the absolute
owner hereof and of each Class B Warrant represented hereby (notwithstanding any
notations  of  ownership  or  writing  hereon  made by anyone  other than a duly
authorized  officer of the Company or the Warrant  Agent) for all  purposes  and
shall not be affected by any notice to the contrary.
                                                                      
                                       B-2







     The  Company  has  agreed  to pay a fee of 5% of the  Purchase  Price  upon
certain  conditions as specified in the Warrant  Agreement  upon the exercise of
the Class B Warrants represented hereby.

     This Warrant  Certificate  shall be governed by and construed in accordance
with the laws of the State of New York.

     This Warrant  Certificate is not valid unless  countersigned by the Warrant
Agent.

     IN WITNESS WHEREOF,  the Company has caused this Warrant  Certificate to be
duly executed,  manually or in facsimile,  by two of its officers thereunto duly
authorized and a facsimile of its corporate seal to be imprinted hereon.

                                          HEURISTIC DEVELOPMENT GROUP, INC.


Dated:  _________________                 By:      _____________________________


                                          By:      _____________________________

[seal]


Countersigned:

AMERICAN STOCK TRANSFER & TRUST COMPANY
_____________________, as Warrant Agent


By:      ______________________________
                  Authorized Officer





                                       B-3





                    [FORM OF REVERSE OF WARRANT CERTIFICATE]

                                SUBSCRIPTION FORM

                     To Be Executed by the Registered Holder
                          in Order to Exercise Warrants


     The undersigned  Registered  Holder hereby  irrevocably  elects to exercise
_________  Class B Warrants  represented  by this Warrant  Certificate,  and to
purchase the securities issuable upon the exercise of such Class B Warrants, and
requests that certificates for such securities shall be issued in the name of

            PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER

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

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

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

                              --------------------
                     [please print or type name and address]


and be delivered to

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

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

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

                              --------------------
                     [please print or type name and address]


and if such  number of Class B  Warrants  shall not be all the Class B  Warrants
evidenced by this Warrant  Certificate,  that a new Warrant  Certificate for the
balance of such Class B Warrants be registered in the name of, and delivered to,
the Registered Holder at the address stated below.


                                                                 
                                       B-4





     The  undersigned  represents  that the  exercise  of the  Class B  Warrants
evidenced  hereby  was  solicited  by a member of the  National  Association  of
Securities  Dealers,  Inc. If not  solicited  by an NASD  member,  please  write
"unsolicited" in the space below. Unless otherwise indicated by listing the name
of another NASD member firm,  it will be assumed that the exercise was solicited
by D.H. Blair Investment Banking Corp.


                                      ------------------------------------
                                               (Name of NASD Member)


Dated:_____________                     X        ______________________________

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

                                      ------------------------------------
                                                        Address


                                      ------------------------------------
                                               Taxpayer Identification Number


                                      ------------------------------------
                                               Signature Guaranteed


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



THE SIGNATURE TO THE ASSIGNMENT OR THE SUBSCRIPTION  FORM MUST CORRESPOND TO THE
NAME AS WRITTEN UPON THE FACE OF THIS WARRANT  CERTIFICATE IN EVERY  PARTICULAR,
WITHOUT  ALTERATION  OR  ENLARGE-  MENT OR ANY  CHANGE  WHATSOEVER,  AND MUST BE
GUARANTEED BY A MEMBER OF THE MEDALLION STAMP PROGRAM.

                                   ASSIGNMENT


                     To Be Executed by the Registered Holder
                           in Order to Assign Warrants


                                       B-5




FOR VALUE RECEIVED, ___________________ hereby sells, assigns and transfers unto


            PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER
                                  OF TRANSFEREE


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

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

                              --------------------
                     [please print or type name and address]


_______________________  of the Class B  Warrants  represented  by this  Warrant
Certificate,     and    hereby    irrevocably     constitutes    and    appoints
______________________________________   Attorney  to  transfer   this   Warrant
Certificate on the books of the Company,  with full power of substitution in the
premises.


Dated: _____________                     X       ______________________________
                                                    Signature Guaranteed


                                                 ______________________________


THE SIGNATURE TO THE ASSIGNMENT OR THE SUBSCRIPTION  FORM MUST CORRESPOND TO THE
NAME AS WRITTEN UPON THE FACE OF THIS WARRANT  CERTIFICATE IN EVERY  PARTICULAR,
WITHOUT  ALTERATION  OR  ENLARGE-  MENT OR ANY  CHANGE  WHATSOEVER,  AND MUST BE
GUARANTEED BY A MEMBER OF THE MEDALLION STAMP PROGRAM.




                                       B-6