EXHIBIT 2.3

       Agreement and Plan of Merger, dated August 28, 1997



                                                                   EXHIBIT 2.3

                             AGREEMENT AND PLAN OF MERGER


    THIS AGREEMENT AND PLAN OF MERGER is dated as of August 28, 1997, by and 
between PROJECT Z CORPORATION, a Delaware corporation ("Merger Sub"), and 
AVID CORPORATION, a Pennsylvania corporation (the "Company").

                                   R E C I T A L S

    A.   Merger Sub's authorized stock consists of 100 shares of common 
stock, of One Cent ($.01) par value each, all of which shares are issued and 
outstanding.  

    B.   Triangle Pharmaceuticals Inc., a Delaware corporation ("Parent"), is 
the owner of all of the issued and outstanding capital stock of Merger Sub.  

    C.   The Parent, Merger Sub, and the Company have entered into an 
Agreement and Plan of Reorganization, dated as of June 30, 1997 (the 
"Reorganization Agreement"), which contemplates the merger of Merger Sub with 
and into the Company (the "Merger") in accordance with this Agreement and 
Plan of Merger.  

    D.   The respective Boards of Directors of Merger Sub and the Company 
deem it advisable and in the best interest of each such corporation and their 
respective shareholders that Merger Sub be merged with and into the Company 
as provided herein and in the Reorganization Agreement, and they have 
accordingly adopted resolutions approving the Reorganization Agreement and 
this Agreement and Plan of Merger.  

    E.   The Parent, as the sole shareholder of Merger Sub, has approved this 
Agreement and Plan of Merger in accordance with the laws of the State of 
Delaware, and the shareholders of the Company have approved this Agreement 
and Plan of Merger in accordance with the laws of the Commonwealth of 
Pennsylvania and the Articles of Incorporation of the Company at a special 
meeting of the shareholders of the Company.  

    Capitalized terms not otherwise defined herein shall have the meanings 
given them in the Reorganization Agreement.

    NOW, THEREFORE, in consideration of the foregoing and the mutual 
covenants and agreements set forth herein, the parties hereto agree as 
follows:  


                                      ARTICLE I.
                                      THE MERGER

    At the Effective Time (as defined in Article V hereof), Merger Sub shall 
be merged with and into the Company (sometimes referred to herein as the 
"Surviving Corporation"), which shall continue to be a domestic business 
corporation governed by the laws of the Commonwealth of Pennsylvania and the 
separate corporate existence of Merger Sub shall thereupon cease.  The Merger 
shall be completed pursuant to the provisions of and shall have the effect 
provided in, the applicable provisions of the Delaware General Corporation 
Law and the Pennsylvania Business Corporation Law ("Pennsylvania Law").  
Without limiting the generality of the foregoing, and subject thereto, at the 
Effective Time, all the property, rights, privileges, powers and franchises 
of the Company and Merger Sub shall vest in the Surviving Corporation, and 
all debts, liabilities and duties of the Company and Merger Sub shall become 
the debts, liabilities and duties of the Surviving Corporation.

                                     ARTICLE II.
                        ARTICLES OF INCORPORATION AND BY-LAWS

    At the Effective Time, the Restated Articles of Incorporation of the 
Company, attached as Exhibit A hereto, shall be the Articles of Incorporation 
of the Company as the Surviving Corporation, until duly amended in accordance 
with law.

    At the Effective Time, the By-Laws of the Company, as in effect 
immediately prior to the Effective Time, shall be the By-Laws of the Company 
as the Surviving Corporation, until duly amended in accordance with law.


                                     ARTICLE III.
                                DIRECTORS AND OFFICERS

    The director(s) of Merger Sub immediately prior to the Effective Time 
shall be the initial director(s) of the Surviving Corporation, each to hold 
office in accordance with the Certificate of Incorporation and Bylaws of the 
Surviving Corporation.  The officers of Merger Sub immediately prior to the 
Effective Time shall be the initial officers of the Surviving Corporation, 
each to hold office in accordance with the Bylaws of the Surviving 
Corporation.

                                     ARTICLE IV.
               CONSIDERATION AND MANNER AND BASIS OF CONVERTING SHARES

    A.   CONSIDERATION TO BE ISSUED.  The consideration to be issued by 
Parent in the Merger (the "Merger Consideration") shall be the Cash 
Consideration (as defined in Section IV.A.1 below) plus the Stock 
Consideration (as defined in Section IV.A.2 below).

                                       2




         1.   CASH CONSIDERATION.  The "Cash Consideration" shall be 
$1,250,000 less the amount of (i) the Severance Payments (as defined in 
Section 4.1(n) of the Reorganization Agreement), (ii) the Bridge Debt (as 
defined in Section 4.1(m) of the Reorganization Agreement) and (iii) the 
Unpaid Company Liabilities (as defined in Section 5.19 of the Reorganization 
Agreement).  The portion of the Cash Consideration, if any, remaining after 
deduction of all of the Third Party Expenses (as defined in Section 5.5 of 
the Reorganization Agreement) of the Company (the "Cash Distribution") and 
after Parent withholds the Assumed Option Amount (as defined in Section 
IV.C.3 below) and the Assumed Warrant Amount (as defined in Section IV.C.4) 
below), shall be paid to the Exchange Agent (as defined in Section IV.E.1 
below) within ten (10) business days after the Closing for distribution 
pursuant to Section IV.E.2 below.

         2.   STOCK CONSIDERATION.  The "Stock Consideration" shall be the 
number of shares of Parent Common Stock equal to the sum of (x) the First 
Payment (as defined in Section IV.A.2.a below), plus (y) the Milestone 
Payments (as defined in Section IV.A.2.b below). 

              a.   FIRST PAYMENT.  The "First Payment" shall be 400,000 
shares of Parent Common Stock which Parent shall deliver into an escrow 
account within ten (10) business days after the Closing as set forth in 
Section IV.E.2 below.

              b.   MILESTONE PAYMENTS.  The "Milestone Payments" are the 
number of shares of Parent Common Stock, if any, that Parent is required to 
deliver to the Exchange Agent pursuant to this Section IV.A.2.b.

                   (i)  In the event that Parent, in its sole discretion, (x) 
Initiates (as defined in Section 1.6(b)(iii) of the Reorganization Agreement) 
a Definitive Clinical Trial (as defined in Section 1.6(b)(iii) of the 
Reorganization Agreement) with the Lead Compound (as defined in Section 
1.6(b)(iii) of the Reorganization Agreement), or (y) notifies the 
Securityholder Agent (as defined in Section 7.2(g) of the Reorganization 
Agreement) in a writing that specifically references Section 1.6(b)(ii)(A) of 
the Reorganization Agreement of its election to continue the development of 
the Lead Compound even if Parent has not Initiated a Definitive Clinical 
Trial with the Lead Compound, Parent shall within seventy-five (75) days 
thereafter make available to the Exchange Agent (as defined in Section IV.E.1 
below) for distribution pursuant to Section IV.E below, 1,600,000 shares of 
Parent Common Stock.

                   (ii) If neither of the conditions described in Section 
IV.A.2.b.(i) above is satisfied on or prior to eighteen (18) months after the 
Closing Date and the Securityholder Agent elects not to exercise the Lead 
Compound Option (as defined in Section 5.17 of the Reorganization Agreement) 
within the thirty (30) day period set forth in Section 5.17 of the 
Reorganization Agreement, Parent shall within seventy-five (75) days 
thereafter make available to the Exchange Agent for distribution pursuant to 
Section IV.E below, 100,000 shares of Parent Common Stock.

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                   (iii)     If one of the conditions described in Section 
IV.A.2.b(i) above is satisfied and thereafter a New Drug Application ("NDA") 
is approved by the United States Food and Drug Administration ("FDA") for the 
Lead Compound in accordance with Section 1.6(b)(ii)(C) of the Reorganization 
Agreement, Parent shall within ten (10) business days thereafter make 
available to the Exchange Agent for distribution pursuant to Section IV.E 
below, 250,000 shares of Parent Common Stock.

                   (iv) If one of the conditions described in Section 
IV.A.2.b(i) above is satisfied and thereafter an NDA is approved by the FDA 
for the Lead Compound in accordance with Section 1.6(b)(ii)(D) of the 
Reorganization Agreement, Parent shall within ten (10) business days 
thereafter make available to the Exchange Agent for distribution pursuant to 
Section IV.E below, 250,000 shares of Parent Common Stock.

                   (v)  If neither of the conditions described in Section 
IV.A.2.b(i) above is satisfied and thereafter an NDA is approved by the FDA 
for the Lead Hepatitis Compound (as defined in Section 1.6(b)(iii) of the 
Reorganization Agreement), Parent shall within ten (10) business days 
thereafter make available to the Exchange Agent for distribution pursuant to 
Section IV.E below, 250,000 shares of Parent Common Stock.

    B.   DISTRIBUTION OF MERGER CONSIDERATION.  The Merger Consideration, 
when distributed by the Exchange Agent pursuant to Section IV.E below, shall 
be distributed as follows:

         1.   DISTRIBUTION OF CASH DISTRIBUTION.  The Cash Distribution 
(other than the portion of the Cash Distribution withheld by Parent for the 
Assumed Option Amount and the Assumed Warrant Amount) shall be distributed 
ratably among the holders of the Company Common Stock in proportion to the 
number of shares of Company Common Stock held by each holder.  The portion of 
the Cash Distribution withheld by Parent for the Assumed Option Amount and 
the Assumed Warrant Amount shall be delivered by Parent to the Exchange Agent 
at the same time that Parent delivers shares of Parent Common Stock, if any, 
issued pursuant to Section IV.A.2.b(i) or (ii) above, and such portion of the 
Cash Distribution shall be distributed, after the expiration of the Assumed 
Options and the Assumed Warrants, among the holders of Assumed Options and 
Assumed Warrants who timely and properly exercise their Assumed Options and 
Assumed Warrants so that such holders receive the portion of the Cash 
Distribution that they would have received had they exercised their Assumed 
Options and Assumed Warrants immediately prior to the Effective Time.  Any 
portion of the Cash Distribution withheld by Parent for the Assumed Option 
Amount and the Assumed Warrant Amount not required to be distributed pursuant 
to the preceding sentence shall be added to and be distributed as part of the 
Designated Assets (as defined in Section IV.B.2 below).  Notwithstanding 
anything to the contrary in this Agreement and Plan of Merger, in no event 
shall any holder receiving a portion of the Cash Distribution distributed 
pursuant to this Section IV.B.1 be required to pay any portion of such Cash 
Distribution to any other holder

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of Company Common Stock or Company Preferred Stock on account of the 
distribution arrangements described in Section IV.B.2 below.  

         2.   DISTRIBUTION OF DESIGNATED ASSETS.

              a.   DESIGNATED ASSETS.  The distribution arrangement described 
in this Section IV.B.2 shall apply to the following (collectively, the 
"Designated Assets"):  (A) the Stock Consideration; (B) the cash, if any, 
actually received by Parent on account of the exercise of Assumed Options and 
Assumed Warrants; and (C) any portion of the Cash Distribution withheld by 
Parent for the Assumed Option Amount and the Assumed Warrant Amount not 
required to be distributed pursuant to Section IV.B.1 above.

              b.   DISTRIBUTION PROCEDURES.  The Designated Assets shall be 
distributed as follows:

                   (i)  First, if the amount of the Cash Distribution is less 
than $1,000,000, a portion of the First Payment shall be distributed ratably 
among the holders of the Company Common Stock.  The portion of the First 
Payment to be distributed to the holders of Company Common Stock shall be a 
number of shares with a dollar value equal to $1,000,000 minus the amount of 
the Cash Distribution, with the First Payment shares to be valued pursuant to 
Section IV.B.5 below.

                   (ii) Second, the remaining Designated Assets shall be 
distributed ratably among the holders of the Company Series A Preferred 
Stock, the Company Series B Preferred Stock and the Company Series C 
Preferred Stock (collectively, "Company Preferred Stock"), until each such 
holder has respectively received the full Series A Preference Amount, Series 
B Preference Amount and Series C Preference Amount (each as defined in 
Section IV.B.6 below) for all shares of Company Preferred Stock held by such 
holder.  In the event that the value of the Designated Assets available for 
distribution under this Section IV.B.2.b(ii) is less than the amount that is 
required to satisfy in full all of the Preference Amounts (as defined in 
Section IV.B.6 below), the amount of the Designated Assets available for 
distribution under this Section IV.B.2.b(ii) shall be distributed ratably 
among the holders of the Company Preferred Stock in proportion to the 
Preference Amount each holder would otherwise be entitled to receive.  All 
Stock Consideration distributed pursuant to this Section IV.B.2.b(ii) shall 
be valued pursuant to Section IV.B.5 below.

                   (iii)     Third, any remaining Designated Assets shall be 
distributed ratably among the holders of the Company Common Stock and the 
Company Series C Preferred Stock in proportion to the number of shares of 
Company Common Stock held by each holder (taking into account, for purposes 
of calculating the amount deemed received by holders of Company Common Stock 
under this Section IV.B.2.b(iii)), the portion of the Cash Distribution, if 
any, received at any time by the holders of the Company Common Stock as well 
as the amount distributed to holders of the Company Common Stock pursuant 

                                       5



to Section IV.B.2.b(i).  The parties intend that the Designated Assets shall 
be distributed under this Section IV.B.2.b(iii) so that each holder of 
Company Common Stock and each holder of Company Series C Preferred Stock 
receives an amount equal to the holder's pro rata portion (in proportion to 
the number of shares of Company Common Stock held or deemed held by each 
holder) of the sum of the Designated Assets distributed under this Section 
IV.B.2.b(iii) plus the portion of the Cash Distribution received at any time 
by the holders of Company Common Stock.  For purposes of this Section 
IV.B.2.b(iii), each holder of the Company Series C Preferred Stock will be 
deemed to hold the number of shares of Company Common Stock that would have 
been issued to the holder had the holder converted all of his or her Company 
Series C Preferred Stock into Company Common Stock on the Revaluation Date 
(as defined in Section IV.B.2.c below).

              c.   REVALUATION OF DESIGNATED ASSETS.  Notwithstanding any 
prior distribution of the Designated Assets, as of the date on which all 
unexercised Assumed Options and Assumed Warrants expire (the "Revaluation 
Date") and prior to release to any Former Company Stockholders (as defined in 
Section 5.17 of the Reorganization Agreement) of any portion of the Escrow 
Fund (as defined in Section 7.2(a) of the Reorganization Agreement), the 
Designated Assets shall be redistributed among the Former Company 
Stockholders in accordance with Section IV.B.2.b based on the valuation of 
such Designated Assets as of the Revaluation Date.  Solely for purposes of 
the redistribution of the Designated Assets as of the Revaluation Date 
contemplated by this Section IV.B.2.c, the shares of Parent Common Stock 
included in such Designated Assets shall be valued at the average of the 
closing prices of Parent Common Stock on the Nasdaq National Market for the 
five (5) consecutive trading days ending five (5) trading days prior to the 
Revaluation Date.  No revaluation or redistribution of any of the Designated 
Assets shall occur with respect to the Stock Consideration, if any, 
distributed by Parent after the Revaluation Date.  In no event, however, 
shall the aggregate value of the Merger Consideration distributed to the 
holders of Company Preferred Stock be less than the aggregate value of the 
Merger Consideration distributed to the holders of the Company Common Stock 
and the holders of Assumed Options and Assumed Warrants.

         3.   TAX ALLOCATION OF MERGER CONSIDERATION.  Solely in connection 
with tax matters, the Merger Consideration will be allocated among the 
holders of Company Common Stock and Company Preferred Stock consistent with 
the distribution arrangements described in Section IV.B.1 and 2 above (making 
the assumption that none of the First Payment is paid to Parent pursuant to 
Article VII of the Reorganization Agreement).

         4.   CERTIFICATES OF SECURITYHOLDER AGENT; RELEASE.

              a.   CERTIFICATES.  Not later than fifteen (15) days prior to 
the date that any of the Merger Consideration is to be delivered by Parent to 
the Exchange Agent pursuant to Section IV.E.2 for distribution to the Former 
Company Stockholders, the Securityholder Agent shall deliver to Parent a 
certificate (each, an "Agent Certificate")

                                       6



identifying each of the Former Company Stockholders and the portion of such 
Merger Consideration, if any, that each such Former Company Stockholder is 
entitled to receive pursuant to Section IV.B.1 and 2 above.  Parent shall be 
entitled to rely without investigation on the information set forth in each 
Agent Certificate in delivering the Merger Consideration to the Exchange 
Agent for distribution pursuant to Section IV.E.2 Notwithstanding anything to 
the contrary in the Reorganization Agreement or this Agreement and Plan of 
Merger, Parent shall not be obligated to deliver any portion of the Merger 
Consideration to the Exchange Agent unless and until the Securityholder Agent 
shall have delivered an Agent Certificate to Parent with respect to such 
portion of the Merger Consideration as required by this Section IV.B.4.a.

              b.   RELEASE.  The Company, for itself, each of its 
Subsidiaries, all Former Company Stockholders and each of their respective 
officers, directors, stockholders, partners, agents, administrators, 
representatives, affiliates, predecessors in interest, successors and 
assigns, hereby unconditionally and forever releases and discharges Parent, 
each of its subsidiaries (including the Surviving Corporation), and each of 
their respective officers, directors, stockholders, partners, agents, 
administrators, representatives, affiliates, predecessors in interest, 
successors and assigns (the "Released Parties") of and from any and all 
claims, causes of action, liabilities, obligations, costs and expenses of 
every kind and nature whatsoever, at law or in equity, whether contractual, 
common law, statutory, federal, state or otherwise, known or unknown, 
suspected or unsuspected, direct or derivative, which now exists or may exist 
at any time in the future based upon or relating in any manner to the 
distribution of the Merger Consideration pursuant to Section IV.B or any 
dispute with respect to the interpretation of the manner in which the Merger 
Consideration is to be distributed pursuant to Section IV.B.  This release 
shall not apply to Parent's obligation to deliver the Merger Consideration to 
the Exchange Agent pursuant to Section IV.E.2 in accordance with the 
information contained in the Agent Certificates.

         5.   VALUATION OF STOCK CONSIDERATION; SHARE NUMBERS.  For purposes 
of determining the value of the shares of Parent Common Stock distributed 
pursuant to Section IV.B.2 (other than Section IV.B.2.c), Parent Common Stock 
distributed by the Exchange Agent shall be valued at the average of the 
closing prices of Parent Common Stock on the Nasdaq National Market for the 
five (5) consecutive trading days ending five (5) trading days prior to the 
date the Parent Common Stock is delivered by Parent to the Exchange Agent.  
All references to numbers of shares of Parent Common Stock in this Agreement 
and Plan of Merger shall be automatically adjusted to reflect any stock 
splits, stock dividends, stock combinations, reverse splits or similar 
changes in Parent Common Stock between the date of this Agreement and Plan of 
Merger and the dates shares of Parent Common Stock are issued pursuant to the 
Merger.

         6.   DEFINITIONS OF PREFERENCE AMOUNTS.

                                       7



              a.   SERIES A PREFERENCE AMOUNT.  The "Series A Preference 
Amount" shall mean an amount per share for each share of the Company's Series 
A Preferred Stock outstanding immediately prior to the Effective Time equal 
to the greater of (A) the sum of $0.75 plus (1) all accrued and unpaid 
dividends on such share, whether or not earned or declared, immediately prior 
to the Effective Time, and (2) an amount equal to the amount of dividends 
that would have accrued on such share from the Effective Time through the 
Revaluation Date if the Merger had not occurred and such share had remained 
outstanding through the Revaluation Date, and (B) the amount that would have 
been payable to the holder of such share had such share and all other shares 
of the Company's Series A Preferred Stock and Series B Preferred Stock been 
converted into Company Common Stock on the Revaluation Date. 

              b.   SERIES B PREFERENCE AMOUNT.  The "Series B Preference 
Amount" shall mean an amount per share for each share of the Company's Series 
B Preferred Stock outstanding immediately prior to the Effective Time equal 
to the greater of (A) the sum of $1.50 plus (1) all accrued and unpaid 
dividends on such share, whether or not earned or declared, immediately prior 
to the Effective Time, and (2) an amount equal to the amount of dividends 
that would have accrued on such share from the Effective Time through the 
Revaluation Date if the Merger had not occurred and such share had remained 
outstanding through the Revaluation Date, and (B) the amount that would have 
been payable to the holder of such share had such share and all other shares 
of the Company's Series A Preferred Stock and Series B Preferred Stock been 
converted into Company Common Stock on the Revaluation Date.  

              c.   SERIES C PREFERENCE AMOUNT.  The "Series C Preference 
Amount" shall mean an amount per share for each share of the Company's Series 
C Preferred Stock outstanding immediately prior to the Effective Time equal 
to the sum of $1.75 plus (A) all accrued and unpaid dividends on such share, 
whether or not earned or declared, immediately prior to the Effective Time, 
and (B) an amount equal to the amount of dividends that would have accrued on 
such share from the Effective Time through the Revaluation Date if the Merger 
had not occurred and such share had remained outstanding through the 
Revaluation Date.  

              d.   PREFERENCE AMOUNTS.  The "Preference Amounts" shall mean 
collectively the Series A Preference Amount, the Series B Preference Amount 
and the Series C Preference Amount.

         7.   TREATMENT OF HOLDERS OF ASSUMED OPTIONS AND ASSUMED WARRANTS. 
For purposes of all distributions to the holders of the Company Common Stock 
pursuant to this Section IV.B, the holder of each Assumed Option and the 
holder of each Assumed Warrant that is timely and properly exercised after 
the Closing shall be treated as, and shall be entitled to receive the portion 
of the Merger Consideration that such holder would have received had such 
portion of the Assumed Option or Assumed Warrant been exercised immediately 
prior to 
                                       8


the Effective Time and the holder been, the holder of the number of shares of 
the Company Common Stock that would have been issued immediately prior to the 
Effective Time upon exercise of the portion of the Assumed Option or Assumed 
Warrant that is timely and properly exercised by such holder.  For example, 
the holder of an Assumed Option that represented the right to purchase 100 
shares of the Company Common Stock immediately prior to the Closing shall, in 
the event the Assumed Option is timely and properly exercised after the 
Closing, be treated as, and shall be entitled to receive the portion of the 
Merger Consideration that such holder would have received had such holder 
been, the holder of 100 shares of the Company Common Stock immediately prior 
to the Closing.

         8.   CORPORATE TRANSACTIONS INVOLVING PARENT.     If after the 
Effective Time Parent is acquired by merger (including by reverse triangular 
merger), or is a party to a consolidation, or liquidates, all references to 
"Parent Common Stock" in this Agreement and Plan of Merger shall thereafter 
mean, on a per-share basis, the amount of cash, securities and/or other 
property received by Parent stockholders for their (pre-transaction) Parent 
Common Stock in such transaction.

    C.   EFFECT ON COMPANY CAPITAL STOCK.

         1.   CONVERSION OF COMPANY CAPITAL STOCK.  Each share of Company 
Capital Stock issued and outstanding immediately prior to the Effective Time 
(other than any shares of Company Capital Stock to be canceled pursuant to 
Section IV.C.2 and any Dissenting Shares (as defined and to the extent 
provided in Section IV.D.1) shall be canceled and extinguished and be 
converted automatically into the right to receive that portion of the Merger 
Consideration set forth in Section IV.B, upon surrender of the certificate 
representing such share of Company Capital Stock in the manner provided in 
Section IV.E.

         2.   CANCELLATION OF COMPANY-OWNED STOCK.  Each share of Company 
Capital Stock owned by the Company or any direct or indirect wholly-owned 
subsidiary of the Company immediately prior to the Effective Time shall be 
canceled and extinguished without any conversion thereof.

         3.   STOCK OPTIONS.

              a.   OPTIONS ASSUMED.  At the Effective Time, each option to 
purchase Company Common Stock issued under the Company's 1992 Incentive Stock 
Option and Non-Qualified Stock Option Plan, the Company's 1993 Incentive 
Stock Option and Non-Qualified Stock Option Plan and/or the Company's 1995 
Incentive Stock Option and Non-Qualified Stock Option Plan, each as amended 
through the date hereof (the "Option Plans"), or otherwise, whose holder 
executes the amendment required by Section 6.3(m) of the Reorganization 
Agreement prior to the Effective Time (each an "Assumed Option"), shall be 
assumed by Parent in accordance with Sections 1.8.(c)(i)(A) and (B) of the 
Reorganization Agreement.

                                       9



              b.   OPTIONS NOT ASSUMED.  Prior to the Effective Time, the 
Company and its Board of Directors shall take all actions necessary to 
accelerate and terminate each option to purchase Company Common Stock whether 
issued under one of the Option Plans or otherwise, whose holder does not 
execute the amendment required by Section 6.3(m) of the Reorganization 
Agreement prior to the Effective Time.

         4.   WARRANTS.

              a.   WARRANTS ASSUMED.  At the Effective Time, each warrant to 
purchase Company Common Stock outstanding immediately prior to the Effective 
Time whose holder executes the amendment required by Section 6.3(m) of the 
Reorganization Agreement prior to the Effective Time (each, an "Assumed 
Warrant") shall be assumed by Parent in accordance with Sections 1.8(d)(i)(A) 
and (B) of the Reorganization Agreement.

              b.   WARRANTS NOT ASSUMED.  Prior to the Effective Time, the 
Company and its Board of Directors shall use their best efforts to cause each 
holder of a warrant to purchase Company Capital Stock outstanding at any time 
prior to the Effective Time to execute the amendment required by Section 
6.3(m) of the Reorganization Agreement or to exercise the warrant in full 
prior to the Effective Time.

         5.   CAPITAL STOCK OF MERGER SUB.  Each share of Common Stock of 
Merger Sub issued and outstanding immediately prior to the Effective Time 
shall be converted into and exchanged for one validly issued, fully paid and 
nonassessable share of Common Stock of the Surviving Corporation.  Each stock 
certificate of Merger Sub evidencing ownership of any such shares of Common 
Stock of the Merger Sub shall, as of the Effective Time, evidence ownership 
of such shares of Common Stock of the Surviving Corporation.

         6.   FRACTIONAL SHARES.  No fraction of a share of Parent Common 
Stock will be issued, but in lieu thereof, each holder of shares of Company 
Capital Stock who would otherwise be entitled to a fraction of a share of 
Parent Common Stock (after aggregating all fractional shares of Parent Common 
Stock to be received by such holder) shall be entitled to receive, without 
any interest, from Parent an amount of cash (rounded to the nearest whole 
cent) equal to the product of (i) such fraction, multiplied by (ii) the 
average of the closing prices of Parent Common Stock on the Nasdaq National 
Market for the five (5) consecutive trading days ending five (5) trading days 
prior to the date the Parent Common Stock from which the holder would, but 
for this Section IV.C.6, otherwise be entitled to a fraction of a share is 
delivered by Parent to the Exchange Agent.

    D.   DISSENTING SHARES.

         1.   Notwithstanding any provision of this Agreement and Plan of 
Merger to the contrary, any shares of Company Capital Stock held by a holder 
who has demanded and perfected appraisal or dissenters' rights for such 
shares in accordance with Pennsylvania Law

                                      10



and who, as of the Effective Time, has not effectively withdrawn or lost such 
appraisal or dissenters' rights ("Dissenting Shares") shall not be converted 
into or represent a right to receive the portion of the Merger Consideration 
otherwise issuable with respect to such shares pursuant to Section IV.B, but 
the holder thereof shall only be entitled to such rights as are granted by 
Pennsylvania Law.

         2.   Notwithstanding the provisions of Section IV.D.1, if any holder 
of shares of Company Capital Stock who demands appraisal of such shares under 
Pennsylvania Law shall effectively withdraw or lose (through failure to 
perfect or otherwise) the right to appraisal, then, as of the later of the 
Effective Time and the occurrence of such event, such holder's shares shall 
automatically be converted into and represent only the right to receive the 
portion of the Merger Consideration issuable with respect to such shares 
pursuant to Section IV.B, without interest thereon, upon surrender of the 
certificate representing such shares.

         3.   The Company shall give Parent (i) prompt notice of any written 
demands for appraisal of any shares of Company Capital Stock, withdrawals of 
such demands, and any other instruments served pursuant to Pennsylvania Law 
and received by the Company and (ii) the opportunity to participate in all 
negotiations and proceedings with respect to demands for appraisal under 
Pennsylvania Law.  The Company shall not, except with the prior written 
consent of Parent, voluntarily make any payment with respect to any demands 
for appraisal of Company Capital Stock or offer to settle or settle any such 
demands.

                                      11



    E.   SURRENDER OF CERTIFICATES.

         1.   EXCHANGE AGENT.  Prior to the Effective Time, Parent shall 
designate, subject to the consent of the Company, which will not be 
unreasonably withheld or delayed, a bank or trust company with assets of not 
less than $500 million to act as exchange agent (the "Exchange Agent").

         2.   PARENT TO PROVIDE CASH AND COMMON STOCK.  Parent shall make 
available to the Exchange Agent (i) the Cash Distribution (other than the 
portion of the Cash Distribution reserved for the Assumed Option Amount and 
the Assumed Warrant Amount) within ten (10) business days after the Closing 
and (ii) the aggregate number of shares of Parent Common Stock issuable 
pursuant to Section IV.A.2 at the times set forth in Section IV.A.2; provided 
that, on behalf of the holders of Company Capital Stock, Parent shall deposit 
the First Payment into an escrow account within ten (10) business days after 
the Closing. The portion of the Escrow Amount contributed on behalf of each 
holder of Company Capital Stock shall be in proportion to the aggregate 
number of shares of Parent Common Stock which such holder would otherwise be 
entitled to receive from the First Payment pursuant to Section IV.B by virtue 
of such holder's ownership of outstanding shares of Company Capital Stock, 
and assuming for the purposes of such allocation that the holders of all 
Assumed Options and the holders of all Assumed Warrants are the holders of 
the number of shares of the Company Common Stock that would have been issued 
had all of the Assumed Options and all of the Assumed Warrants been exercised 
in full immediately prior to the Effective Time (assuming that the exercise 
price was paid in cash).

         3.   EXCHANGE PROCEDURES.  Promptly after the Effective Time, the 
Surviving Corporation shall cause to be mailed to each holder of record of a 
certificate or certificates (the "Certificates") which immediately prior to 
the Effective Time represented outstanding shares of Company Capital Stock 
and which shares were converted into the right to receive the portion of the 
Merger Consideration issuable with respect to such shares pursuant to Section 
IV.B, (i) a letter of transmittal (which shall specify that delivery shall be 
effected, and risk of loss and title to the Certificates shall pass, only 
upon delivery of the Certificates to the Exchange Agent and shall be in such 
form and have such other provisions as Parent may reasonably specify) and 
(ii) instructions for use in effecting the surrender of the Certificates in 
exchange for the Merger Consideration.  Upon surrender of a Certificate for 
cancellation to the Exchange Agent or to such other agent or agents as may be 
appointed by Parent, together with such letter of transmittal, duly completed 
and validly executed in accordance with the instructions thereto, the holder 
of such Certificate shall be entitled to receive in exchange therefor the 
portion of the Merger Consideration issuable pursuant to Section IV.B (less 
the First Payment to be deposited in the Escrow Fund on such holder's behalf 
pursuant to Article VII of the Reorganization Agreement) as and when the 
Exchange Agent receives the Merger Consideration with respect to the shares 
of Company Capital Stock represented by such Certificate, and the Certificate 
so surrendered shall forthwith be canceled.  Subject to and in accordance 
with the provisions of Article VII of the Reorganization Agreement, Parent 
shall

                                      12



cause to be distributed to the Escrow Agent (as defined in Article VII of the 
Reorganization Agreement) a certificate or certificates representing the 
number of shares of Parent Common Stock equal to the First Payment, which 
certificate shall be registered in the name of the Escrow Agent.  Such shares 
shall be beneficially owned by the holders on whose behalf such shares were 
deposited in the Escrow Fund and shall be available to compensate Parent as 
provided in Article VII of the Reorganization Agreement. Until so 
surrendered, each outstanding Certificate that, prior to the Effective Time, 
represented shares of Company Capital Stock will be deemed from and after the 
Effective Time, for all corporate purposes, other than the payment of 
dividends, to evidence the right to receive in accordance with Section IV.C.1 
the portion of the Merger Consideration issuable pursuant to Section IV.B 
(less the Escrow Amount to be deposited in the Escrow Fund on such holder's 
behalf pursuant to Article VII of the Reorganization Agreement) as and when 
the Exchange Agent receives the Merger Consideration with respect to the 
shares of Company Capital Stock represented by such Certificate.

         4.   DISTRIBUTIONS WITH RESPECT TO UNEXCHANGED SHARES.  No dividends 
or other distributions with respect to Parent Common Stock declared or made 
after the date such shares are to be distributed to the holders of the 
Company Capital Stock and with a record date after such date will be paid to 
the holder of any unsurrendered Certificate with respect to the shares of 
Parent Common Stock represented thereby until the holder of record of such 
Certificate shall surrender such Certificate.  Subject to applicable law, 
following surrender of any such Certificate, there shall be paid to the 
record holder of the certificates representing whole shares of Parent Common 
Stock issued in exchange therefor, without interest, at the time of such 
surrender, the amount of dividends or other distributions with a record date 
after the date such shares are to be distributed to the holders of the 
Company Capital Stock theretofore payable with respect to such whole shares 
of Parent Common Stock.

         5.   TRANSFERS OF OWNERSHIP.  If any certificate for shares of 
Parent Common Stock is to be issued in a name other than that in which the 
Certificate surrendered in exchange therefor is registered, it will be a 
condition of the issuance thereof that the Certificate so surrendered will be 
properly endorsed and otherwise in proper form for transfer and that the 
person requesting such exchange will have paid to Parent or any agent 
designated by it any transfer or other taxes required by reason of the 
issuance of a certificate for shares of Parent Common Stock in any name other 
than that of the registered holder of the Certificate surrendered, or 
established to the satisfaction of Parent or any agent designated by it that 
such tax has been paid or is not payable.

         6.   NO LIABILITY.  Notwithstanding anything to the contrary in this 
Section IV.E, none of the Exchange Agent, the Surviving Corporation or any 
party to this Agreement and Plan of Merger shall be liable to a holder of 
shares of Parent Common Stock or Company Capital Stock for any amount 
properly paid to a public official pursuant to any applicable abandoned 
property, escheat or similar law.

                                      13



         7.   NO FURTHER OWNERSHIP RIGHTS IN COMPANY COMMON STOCK.  All 
shares of Parent Common Stock issued upon the surrender for exchange of 
shares of Company Capital Stock in accordance with the terms hereof shall be 
deemed to have been issued in full satisfaction of all rights pertaining to 
such shares of Company Capital Stock, and there shall be no further 
registration of transfers on the records of the Surviving Corporation of 
shares of Company Capital Stock which were outstanding immediately prior to 
the Effective Time.  If, after the Effective Time, Certificates are presented 
to the Surviving Corporation for any reason, they shall be canceled and 
exchanged as provided in this Section IV.E.

         8.   LOST, STOLEN OR DESTROYED CERTIFICATES.  In the event any 
Certificates evidencing shares of Company Capital Stock shall have been lost, 
stolen or destroyed, the Exchange Agent shall issue in exchange for such 
lost, stolen or destroyed Certificates, upon the making of an affidavit of 
that fact by the holder thereof, such shares of Parent Common Stock, if any, 
as may be required to be delivered in exchange therefor pursuant to Section 
IV.B; provided, however, that Parent may, in its discretion and as a 
condition precedent to the issuance thereof, require the owner of such lost, 
stolen or destroyed Certificates to deliver a bond in such sum as it may 
reasonably direct as indemnity against any claim that may be made against 
Parent or the Exchange Agent with respect to the Certificates alleged to have 
been lost, stolen or destroyed.

                                      ARTICLE V
                                    EFFECTIVE TIME

    As used in this Agreement and Plan of Merger, the term "Effective Time" 
shall mean the time of confirmation by the Secretary of State of the 
Commonwealth of Pennsylvania of the filing of this Agreement and Plan of 
Merger and the officers' certificates required by Pennsylvania Law with the 
Secretary of State of the Commonwealth of Pennsylvania. 

                                      ARTICLE VI
                                ABANDONMENT OF MERGER

    This Agreement and Plan of Merger shall be terminated and abandoned 
without further action by the parties hereto in the event that the 
Reorganization Agreement is terminated in accordance with its terms, and in 
such event this Agreement and Plan of Merger shall have no further force and 
there shall be no liability on the part of the parties hereto to each other, 
except to the extent otherwise provided in the Reorganization Agreement.

                                     ARTICLE VII
                                      AMENDMENT

    Subject to applicable law, this Agreement and Plan of Merger may be 
amended, modified or supplemented only by written agreement of Merger Sub and 
the Company, duly authorized by each of their respective Boards of Directors, 
at any time prior to the filing of

                                      14



the officers' certificates required by Pennsylvania Law with respect to the 
Merger with the Secretary of State of the Commonwealth of Pennsylvania; 
provided, however, that no such amendment, modification or supplement shall 
change the amount or the form of the consideration to be furnished to the 
Company shareholders in accordance with Article IV hereof.  

                  [Remainder of This Page Intentionally Left Blank]

                                      15



    IN WITNESS HEREOF, the parties hereto have executed this Agreement and 
Plan of Merger as of the date first written above.

                                  AVID CORPORATION

                                  By: /s/ FORREST H. ANTHONY
                                      -------------------------------------
                                      Forrest H. Anthony, President 
                                      and Chief Executive Officer


                                  By: /s/ RICHARD DRIANSKY           
                                      -------------------------------------
                                      Richard Driansky, Secretary    



                                  PROJECT Z CORPORATION 


                                  By: /s/ M. NIXON ELLIS           
                                      -------------------------------------
                                      M. Nixon Ellis, President


                                  By: /s/ CHRIS A. RALLIS           
                                      -------------------------------------
                                      Chris A. Rallis, Secretary



                  [SIGNATURE PAGE TO AGREEMENT AND PLAN OF MERGER]


                                      16



                                  EXHIBIT A

                            AMENDED AND RESTATED
                          ARTICLES OF INCORPORATION
                                     OF
                              AVID CORPORATION


    In compliance with the requirements of the Pennsylvania Business 
Corporation Law of 1988, as amended, 15Pa.C.S. Section 1911 et seq. (relating 
to amendment of articles of incorporation), the corporation hereby desires to 
amend and restate its Articles of Incorporation in their entirety as follows:

    1.  NAME. The name of the corporation is:

                          Avid Corporation

    2.  ADDRESS. The address of this corporation's registered office in this 
Commonwealth is:

                    3401 Market Street, Suite 300
                    Philadelphia, PA 19104
                    Philadelphia County

    3.  INCORPORATION.  The corporation was incorporated under the 
Pennsylvania Business Corporation Law of 1988.

    4.  PERPETUAL EXISTENCE.  The corporation shall have perpetual existence.

    5.  STOCK.  The aggregate number of shares the corporation shall have the 
authority to issue is One Hundred (100) shares of Common Stock, par value 
$.01 per share.

    6.  CUMULATIVE VOTING.  The shareholders of the corporation shall not be 
entitled to cumulate votes in the election of directors.


                                      17