META GROUP INC
8-K, 1998-11-03
ENGINEERING, ACCOUNTING, RESEARCH, MANAGEMENT
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                   -------

                                  FORM 8-K

                               CURRENT REPORT
                     PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934


      Date of report (Date of earliest event reported):  October 20, 1998
                                                         ----------------


                              META GROUP, INC.
- -------------------------------------------------------------------------------
             (Exact name of Registrant as Specified in Charter)


           DELAWARE                   0-27280             06-0971675
           --------                   -------             ----------
 (State or other jurisdiction    (Commission file      (I.R.S. Employer
     of incorporation or              number)        Identification No.)
        organization)


208 Harbor Drive, Stamford, CT                                 06912
- ------------------------------                                 -----
(Address of principal executive offices)                   (Zip Code)


Registrant's telephone number including area code:  (203) 973-6700

                          No change since last report
      --------------------------------------------------------------------
              (Former name or address, if changed since last report)



<PAGE>


Item 2.  Acquisition or Disposition of Assets.
- ----------------------------------------------

      On October 20,  1998,  META  Group,  Inc.  ("META  Group")  acquired  (the
"Acquisition")  all of the capital  stock of The Sentry Group,  Inc.  ("Sentry")
through  a  merger  of  MG  Acquisition   Corporation   ("Acquisition  Sub"),  a
wholly-owned subsidiary of META Group, with and into Sentry. The Acquisition was
consummated pursuant to an Agreement and Plan of Merger by and among META Group,
Acquisition  Sub  and  Sentry  dated  as of  September  23,  1998  (the  "Merger
Agreement").

      Sentry's  assets consist  primarily of its information  technology  ("IT")
business  value  consulting  practice.  This practice  consists  primarily of IT
consultants.  Sentry helps companies  resolve the critical problem of widespread
inefficiency  often  found in  outsourcing  and the  lost  business  value  from
unrealized IT investments.  META Group currently  intends to operate Sentry as a
separate  business unit which will expand and complement  META Group's  existing
META Group Consulting division.

      The following  summary of the  Acquisition is qualified in its entirety by
the more  detailed  information  contained  in the copy of the Merger  Agreement
included as Exhibit 2.1 to this Current Report on Form 8-K.

      As  consideration  for the  capital  stock of Sentry,  META Group paid the
holders of Sentry's  common stock 195,066  shares in the aggregate of META Group
common stock,  par value $.01 per share ("META Group Common Stock"),  as initial
consideration.  If  certain  financial  targets  for Sentry are met for the 1999
fiscal  year,  META Group will pay up to $7.0  million in the  aggregate in META
Group Common  Stock or cash,  at META Group's  option.  In addition,  META Group
issued to the holders of Sentry common stock as additional initial consideration
warrants  to  purchase  up to 200,000  shares of META Group  Common  Stock at an
exercise price of $30.00 per share.  Warrants to purchase 125,000 shares of META
Group Common Stock are  currently  exercisable  and warrants to purchase  75,000
shares of META Group  Common  Stock are  exercisable  only if certain  financial
targets  are  met by  Sentry  for  the  1999  fiscal  year.  The  source  of the
consideration  was from the  authorized  common  stock of META Group and, to the
extent contingent consideration, if any, is paid in cash, from META Group's cash
on hand. It is anticipated that 150,101 shares of the initial payment of 195,066
shares will be registered by META Group  pursuant to the terms of a Registration
Rights  Agreement  (attached hereto as Exhibit 4.1). The remainder of the shares
will be  placed  into  escrow  pursuant  to the  terms  of an  Escrow  Agreement
(attached hereto as Exhibit 4.2).

      The  purchase  price for  shares of Sentry  capital  stock was  determined
through arms' length  negotiations  between  management of META Group on the one
hand and  Sentry  and  Sentry's  stockholders  on the  other  hand.  The  Merger
Agreement was approved by the Boards of META Group,  Acquisition  Sub and Sentry
and, at a special meeting of the Sentry stockholders,  by Sentry's stockholders.
Sentry's  stockholders  consist  of  32  persons  and  entities.  Prior  to  the
Acquisition,  the following persons or entities  beneficially owned five or more
percent of Sentry common stock: Safeguard Scientifics (Delaware),  Inc., William
A.  Gannon,  Sr.,  Robert H.  Cawly and Kirk K.  Reiss.  Neither  Sentry nor its
stockholders  had any material  relationship  prior to the Acquisition with META
Group,  Acquisition  Sub, any  affiliate of META Group or  Acquisition  Sub, any
officer or director of META Group or  Acquisition  Sub or any  associate  of any
such officer or director.

      META Group  intends to use  Sentry's  assets to  complement  META  Group's
existing META Group Consulting  business.  The Acquisition will be accounted for
as a purchase.

      In partial response to this item, META Group's press release dated October
21, 1998 is incorporated  herein by reference (and is attached hereto as Exhibit
99.1).

Item 7.  Financial Statements and Exhibits
- ------------------------------------------

      (c)   Exhibits.

            2.1 Agreement  and Plan of Merger by and among META Group,  Inc., MG
                Acquisition  Corporation  and The Sentry Group,  Inc.  dated as
                of September 23,1998 ("Agreement and Plan of Merger")(with 
                certain confidential information deleted).

            2.2 Amendment No. 1 to Agreement and Plan of Merger.

            4.1 Registration Rights Agreement dated as of October 20, 1998 by
                and among META Group,  Inc. and the  stockholders of The Sentry
                Group,  Inc. listed on the signature pages thereto.

            4.2 Escrow  Agreement dated as of October 20, 1998 among META Group,
                Inc., Peter A. Naber and State Street Bank and Trust Company.

            99.1 Press release dated October 21, 1998.



<PAGE>


                                    SIGNATURE


Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned thereunto duly authorized.


                                  META GROUP, INC.



                                  By:   /s/Dale Kutnick
                                        -------------------------------------
                                        Dale Kutnick
                                        President and Chief Executive Officer



Date: November 3, 1998



  WHEREVER CONFIDENTIAL INFORMATION IS OMITTED HEREIN (SUCH OMISSIONS
  ARE DENOTED BY AN ASTERISK), SUCH CONFIDENTIAL INFORMATION HAS BEEN 
  SUBMITTED SEPARATELY TO THE SECURITIES AND EXCHANGE COMMISSION 
  PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT


                         AGREEMENT AND PLAN OF MERGER

                                 BY AND AMONG

                              META GROUP, INC.,

                          MG ACQUISITION CORPORATION

                                     AND

                            THE SENTRY GROUP, INC.


                        Dated as of September 23, 1998


<PAGE>

                              TABLE OF CONTENTS

ARTICLE I - THE MERGER.......................................................2
  1.1 The Merger.............................................................2
  1.2 Effective Time.........................................................2
  1.3 Certain Effects of the Merger..........................................2
  1.4 Articles of Organization...............................................2
  1.5 By-Laws................................................................3
  1.6 Directors and Officers.................................................3
  1.7 Certain Other Agreements...............................................3
  1.8 Escrow.................................................................3
  1.9 Stockholder Representative.............................................4
ARTICLE II - CONVERSION AND EXCHANGE OF SECURITIES; MERGER CONSIDERATION.....4
  2.1 Shares of the Surviving Corporation....................................4
  2.2 Conversion of Company Common...........................................4
  Conversion of SENTRY Securities; Warrants; Contingent Consideration;
  Limitation on Shares of META Common; Book Escrow Release...................5
  2.4 Exchange Agent........................................................11
  2.5 No Fractional META Common or Warrants.................................11
  2.6 Distribution of META Common and Warrants..............................11
  2.7 Closing of Stock Transfer Books.......................................12
  2.8 Dissenting Shares.....................................................12
  2.9 No Liability..........................................................12
ARTICLE III - REPRESENTATIONS AND WARRANTIES OF SENTRY......................13
  3.1 Corporate Existence and Power.........................................13
  3.2 Corporate Authorization...............................................13
  3.3 Governmental Authorization............................................14
  3.4 Non-Contravention.....................................................14
  3.5 Capitalization........................................................14
  3.6 Subsidiaries..........................................................15
  3.7 Financial Statements..................................................15
  3.8 Absence of Undisclosed Liabilities....................................15
  3.9 Properties............................................................16
  3.10 Real Property........................................................16
  3.11 Condition of Tangible Assets.........................................16
  3.12 Intellectual Property................................................16
  3.13 Absence of Certain Changes...........................................18
  3.14 Litigation...........................................................19
  3.15 Material Contracts...................................................19
  3.16 Taxes................................................................21
  3.17 Employees............................................................22
  3.18 Transactions with Affiliates.........................................23
  3.19 Insurance Coverage...................................................23
  3.20 Compliance with Laws; No Defaults....................................24
  3.21 Finders' Fees........................................................24
  3.22 Environmental Matters................................................24
  3.23 Intercompany Arrangements; Conflicts.................................25
  3.24 Employee Plans.......................................................25
  3.25 Other Information....................................................26
  3.26 Sale of the Book.....................................................27
  3.27 Closing Balance Sheet................................................27
ARTICLE IV - REPRESENTATIONS AND WARRANTIES OF META AND THE COMPANY.........27
  4.1 Corporate Existence and Power.........................................27
  4.2 Corporate Authorization...............................................27
  4.3 Governmental Authorization............................................28
  4.4 Non-Contravention.....................................................28
  4.5 Capitalization........................................................28
  4.6 META Common...........................................................28
  4.7 META SEC Documents....................................................28
  4.8 Absence of Certain Changes............................................29
  4.9 Litigation............................................................29
  4.10 Finders' Fees........................................................29
ARTICLE V - COVENANTS.......................................................29
  5.1 Mutual Covenants and Agreements.......................................29
  5.2 Certain Covenants of SENTRY...........................................31
  5.3 Covenants of META and the Company.....................................35
ARTICLE VI - CLOSING MATTERS................................................35
  6.1 The Closing...........................................................35
  6.2 Documents and Certificates............................................36
ARTICLE VII - CONDITIONS OF CLOSING.........................................36
  7.1 Conditions to Obligations of META, the Company and SENTRY.............36
  7.2 Conditions Applicable to META and the Company.........................37
  7.3 Conditions Applicable to SENTRY.......................................39
ARTICLE VIII - TERMINATION..................................................40
  8.1 Termination...........................................................40
  8.2 Notice of Termination; Effect of Termination..........................41
  8.3 Procedure Upon Termination............................................41
ARTICLE IX -- SURVIVAL; INDEMNIFICATION.....................................41
  9.1 Survival..............................................................41
  9.2 Indemnification.......................................................42
  9.3 Third Person Claims...................................................43
  9.4 Limitations on Indemnification........................................44
  9.5 Method of Payment; Nonexclusivity.....................................44
  9.6 Directors and Officers Indemnification................................44
  9.7 No Contribution.......................................................45
ARTICLE X -- MISCELLANEOUS..................................................45
  10.1 Other Remedies; Specific Performance.................................45
  10.2 Expenses.............................................................45
  10.3 Further Assurances...................................................45
  10.4 Parties in Interest..................................................46
  10.5 Entire Agreement.....................................................46
  10.6 Amendment or Modification............................................46
  10.7 Waiver...............................................................46
  10.8 Assignability........................................................46
  10.9 Certain Definitions..................................................46
  10.10 Headings and Interpretation.........................................49
  10.11 Notices.............................................................49
  10.12 Law Governing.......................................................50
  10.13 Invalidity of Provisions............................................50
  10.14 Counterparts; Facsimile Signatures..................................50

Exhibits
- --------
  Exhibit A   -- Participation Agreement
  Exhibit B   -- Registration Rights Agreement
  Exhibit C   -- Escrow Agreement
  Exhibit D-1 -- Form of Common Stock Purchase Warrant -- CurrentExercisability
  Exhibit D-2 -- Form of Common Stock Purchase  Warrant -- Contingent 
                 Exercisability 
  Exhibit E   -- Intentionally Omitted Exhibit F-- Intentionally Omitted
  Exhibit G   -- List of Employees Who Have Signed Noncompetition/Nondisclosure
                 Agreements
  Exhibit H-1 -- Form of Opinion of Counsel to SENTRY
  Exhibit H-2 -- Form of  Opinion of Counsel to Safeguard/Safeguard
                 LTIP Participants
  Exhibit I   -- Form of Opinion of Counsel to META

 Schedules
 ---------

<PAGE>
                 Agreement and Plan of Merger -- Page iv


                              Glossary of Terms

Term                                                Section
- ----                                                -------

Accounting Referee...............................   2.3(e)
Acquisition Proposals............................   5.2(m)
Affiliate........................................   10.9
Agreement........................................   Introduction
Book Closing Documents...........................   2.3(g)
Book Escrow Payments.............................   2.3(g)
Book Purchase Agreement..........................   2.3(g)
Burdensome Condition.............................   7.1(a)
CERCLA...........................................   10.9
Certificates.....................................   2.6(b)
Closing..........................................   6.1
Closing Balance Sheet............................   7.2(o)
Closing Date.....................................   6.1
Code.............................................   3.16(a)
Commission.......................................   4.7
Company..........................................   Introduction
Confidentiality Agreement........................   5.1(c)
Constituent Corporations.........................   Introduction
Contingent Closing Date..........................   2.3(e)
Contingent Consideration.........................   2.3(e)
Contingently Exercisable Warrants................   2.3(a)
Control..........................................   10.9
Currently Exercisable Warrants...................   2.3(a)
Damages..........................................   9.2
Dissenting Shares................................   2.8
EEOC.............................................   3.17(b)
Effective Time...................................   1.2
Employees........................................   3.17(a)
Environmental Laws...............................   10.9
Environmental Liabilities........................   10.9
ERISA............................................   3.24(a)
ERISA Affiliate..................................   3.24(a)
Escrow Account...................................   1.8(b)
Escrow Agent.....................................   1.8(a)
Escrow Agreement.................................   1.7(a)
Escrow Shares....................................   1.8(c)
Exchange Act.....................................   4.3
Exchange Agent...................................   2.4
Exchange Ratio...................................   2.3(a)
Final META Stock Price...........................   10.9
Financial Statements.............................   3.7
                           
<PAGE>
              Agreement and Plan of Merger -- Pave v

Former SENTRY Holders............................   2.3(e)(i)
Governmental Authority...........................   3.3
Hazardous Substance..............................   10.9
Implied Contingent Closing Date..................   9.1
Indemnified Parties..............................   9.6
Indemnitee.......................................   9.2
Information Statement............................   5.2(h)
Initial Consideration............................   2.3(a)
IRS..............................................   3.24(b)
Key Employees....................................   3.17(d)
Liabilities or Obligations.......................   3.8
Lien.............................................   3.4
Major Stockholders...............................   1.7(a)
Massachusetts BCL................................   Recitals
Material Adverse Effect on META..................   4.1
Material Adverse Effect on SENTRY................   3.1
META.............................................   Introduction
META Closing Price...............................   10.9
META Common......................................   Recitals
META Contingent Closing Price....................   10.9
META SEC Documents...............................   4.7
Meeting..........................................   5.2(h)
Merger...........................................   1.1
Merger Consideration.............................   2.3(a)
Non-Plan Options.................................   5.1(f)
Notice of Claim..................................   9.3
Orchid...........................................   2.3(e)
Options Exchange Ratio...........................   10.9
Order............................................   8.1(c)
Outstanding Options..............................   5.1(f)
Participation Agreement..........................   1.7(a)
person...........................................   10.9
Registration Rights Agreement....................   1.7(a)
Release..........................................   10.9
Resale Registration Statement....................   5.1(g)
Return or Returns................................   3.16(a)
Safeguard........................................   5.2(k)
Schedules........................................   Introduction to
                                                    Article III
Securities Act...................................   4.3
SENTRY...........................................   Introduction
SENTRY Common....................................   Recitals
SENTRY Employee Plans............................   3.24(a)
SENTRY Intellectual Property Rights..............   3.12
SENTRY Option....................................   5.1(f)
SENTRY Securities................................   3.5
SENTRY Stockholders..............................   2.3(e)
SENTRY Stock Option Plans........................   10.9
SENTRY Third Party Intellectual Property Rights..   3.12
SENTRY Warrants..................................   10.9
Stockholder Representative.......................   1.9
Subsidiary.......................................   10.9
Surviving Corporation............................   1.1
Surviving Corporation Auditors...................   10.9
Surviving Corporation Operating Income...........   10.9
Surviving Corporation Operating Margin...........   10.9
Surviving Corporation Revenues...................   10.9
Tax or Taxes.....................................   3.16(a)
Third Person.....................................   9.3
Unaudited Balance Sheet..........................   3.7
Warrants.........................................   2.3(a)
Wiesner..........................................   2.3(g)


<PAGE>


                        AGREEMENT AND PLAN OF MERGER


        This  Agreement  and Plan of Merger dated as of September  23, 1998 (the
"Agreement") by and among META Group, Inc., a Delaware corporation  ("META"), MG
Acquisition  Corporation,   a  Massachusetts   corporation  and  a  wholly-owned
subsidiary of META (the "Company"),  and The Sentry Group, Inc., a Massachusetts
corporation ("SENTRY"; SENTRY and the Company being hereinafter sometimes called
the "Constituent Corporations"):

                                 WITNESSETH:

        WHEREAS,  the authorized capital stock of META consists of (i) 2,000,000
shares of  Preferred  Stock,  par value $.01 per  share,  of which no shares are
issued and  outstanding,  and (ii) 45,000,000  shares of Common Stock, par value
$.01 per share (the "META Common"),  of which 11,357,587  shares were issued and
outstanding as of August 31, 1998;

        WHEREAS,  the authorized  capital stock of the Company consists of 3,000
shares of Common Stock, par value $.01 per share, of which 100 shares are issued
and outstanding and are owned beneficially and of record by META;

        WHEREAS,  the authorized  capital stock of SENTRY consists of 12,000,000
shares of Common Stock, par value $.01 per share (the "SENTRY Common"), of which
6,156,882 shares are issued and outstanding as of the date hereof;

        WHEREAS,  the  respective  Boards of Directors of the Company and SENTRY
have, by adoption of votes  regarding the same,  approved this Agreement and the
transactions  contemplated hereby including,  without limitation,  the merger of
the  Company  with and into  SENTRY  under  and  pursuant  to the  Massachusetts
Business Corporation Law (the "Massachusetts BCL") upon the terms and subject to
the conditions hereinafter set forth;

        WHEREAS,  pursuant  to and  upon the  effectiveness  of the  Merger  (as
defined  herein),  each then  outstanding  share of SENTRY  Common  (subject  to
certain  limited  exceptions as set forth  herein)  shall be converted  into the
right to receive the Merger Consideration (as defined herein), net of applicable
withholding  and other taxes,  upon the terms and subject to the  conditions set
forth herein; and

        WHEREAS,  to induce META and the  Company to enter into this  Agreement,
simultaneously  with the  execution and delivery of this  Agreement,  certain of
SENTRY's  stockholders  have entered into certain  agreements  with META and the
Company  pursuant  to which such SENTRY  stockholders  have  undertaken  to take
certain  actions  in  connection  with  the  transactions  contemplated  by this
Agreement.

        NOW,  THEREFORE,  in  consideration  of these  premises  and the  mutual
agreements,   provisions  and  covenants   contained  in  this  Agreement,   the
sufficiency of which is hereby acknowledged,  the parties hereto hereby agree as
follows:

<PAGE> 2

                                  ARTICLE I

                                  THE MERGER

     1.1 The Merger. In accordance with Section 78 of the Massachusetts BCL, the
Company shall be merged with and into SENTRY (the "Merger"), and SENTRY shall be
the surviving  corporation  (such  corporation in its capacity as such surviving
corporation being hereinafter called the "Surviving  Corporation").  The purpose
of the Surviving Corporation shall be as set forth in Article II of the articles
of  organization  of the Surviving  Corporation,  as amended in accordance  with
Section 1.4. The terms and  conditions  of the Merger,  the mode of carrying the
same into effect,  and the manner and basis of converting  shares of each of the
Constituent  Corporations  into the  consideration  which the  holders  of those
shares are to receive upon  conversion of such shares,  shall be as set forth in
this Agreement.

     1.2 Effective Time. The Merger shall become effective as of the time of the
filing of the executed articles of merger with the Secretary of the Commonwealth
of  the   Commonwealth   of   Massachusetts   and  any  required   districts  of
Massachusetts,  all  pursuant  to  Section  78 of  the  Massachusetts  BCL  (the
"Effective Time").

     1.3 Certain Effects of the Merger.  As of the Effective Time, the effect of
the  Merger  shall  be  as  provided  by  the   applicable   provisions  of  the
Massachusetts  BCL. Without limiting the generality of the foregoing and subject
thereto,  at the  Effective  Time:  the separate  existence of the Company shall
cease and the Company  shall be merged into SENTRY;  the  Surviving  Corporation
shall possess,  without further act or deed, all the estate,  property,  rights,
privileges,  powers and franchises of each of the Constituent  Corporations  and
all of their  property,  real,  personal  and  mixed,  and all the  debts due on
whatever  account to any of the Constituent  Corporations,  as well as all stock
subscriptions  and other choses in action  belonging to each of the  Constituent
Corporations  shall be transferred  to and vested in the Surviving  Corporation;
and all claims,  demands,  property and other  interest shall be the property of
the Surviving Corporation, and the title to all real estate vested in any of the
Constituent Corporations shall not revert or be in any way impaired by reason of
the  Merger  but shall be vested in the  Surviving  Corporation;  the  rights of
creditors of any  Constituent  Corporation  shall not in any manner be impaired,
nor shall any liability or obligation,  including taxes due or to become due, or
any claim or demand in any cause existing against such Constituent  Corporation,
or any stockholder, director, or officer thereof, be released or impaired by the
Merger, but the Surviving Corporation shall be deemed to have assumed, and shall
be liable  for,  all  liabilities  and  obligations  of each of the  Constituent
Corporations  in the same  manner  and to the same  extent  as if the  Surviving
Corporation   had  itself  incurred  such   liabilities  or   obligations;   the
stockholders,  directors,  and officers of the  Constituent  Corporations  shall
continue  to be subject to all the  liabilities,  claims  and  demands  existing
against  them as such at or before  the  Merger;  no action or  proceeding  then
pending before any court or tribunal of the  Commonwealth  of  Massachusetts  in
which any Constituent  Corporation is a party, or in which any such stockholder,
director, or officer is a party, shall abate or be discontinued by reason of the
Merger, but any such action or proceeding may be prosecuted to final judgment as
though the Merger  had not taken  place,  or the  Surviving  Corporation  may be
substituted as a party in place of any  Constituent  Corporation by the court in
which such action or proceeding is pending.

     1.4 Articles of Organization. The articles of organization of the Surviving
Corporation  (other than Article I thereof) shall,  from and after the Effective

<PAGE> 3

Time,  be amended to read as set forth in the  articles of  organization  of the
Company as in effect  immediately  prior to the Effective  Time until changed as
permitted by law or by such articles of  organization.  ARTICLE I shall continue
to read in its entirety as follows:  "The name of the  Corporation is The Sentry
Group, Inc."

     1.5 By-Laws.  The by-laws of the Surviving  Corporation shall, from
and after the Effective  Time, be amended and restated to read in their entirety
as set forth in the by-laws of the Company as in effect immediately prior to the
Effective   Time  until  changed  as  permitted  by  law,  by  the  articles  of
organization of the Surviving  Corporation or by such by-laws.

     1.6  Directors  and  Officers.  The directors and officers of the Surviving
Corporation  from and  after  the  Effective  Time  shall be the  directors  and
officers of the Company  immediately  prior to the Effective  Time, each to hold
office in accordance with  applicable law and the articles of  organization  and
by-laws of the Surviving  Corporation.

     1.7  Certain Other Agreements.  a)(i) Concurrently with the execution
and delivery of this Agreement, the Major Stockholders (as defined herein) shall
deliver to META and the  Company a copy of the  Participation  Agreement  in the
form of Exhibit A (the "Participation Agreement") duly executed and delivered by
the stockholders named therein (the "Major Stockholders");

                 (ii) On the Closing  Date  immediately  prior to the  Effective
     Time, SENTRY shall deliver to META and the Company:

                 (A) a copy of the Registration  Rights Agreement in the form of
     Exhibit B (the "Registration Rights Agreement") duly executed and delivered
     by the stockholders of SENTRY named therein; and

                 (B) a copy of the  Escrow  Agreement  in the form of  Exhibit C
     (the "Escrow  Agreement")  duly executed and  delivered by the  Stockholder
     Representative (as defined herein).

           (b)  META and the  Company  shall  deliver  to the  respective  other
parties  thereto copies of the  Participation  Agreement  concurrently  with the
execution and delivery of this Agreement, and copies of each of the Registration
Rights Agreement and the Escrow Agreement on the Closing Date immediately  prior
to the Effective  Time, in each case duly executed by META, the Company or both,
as the case may be. META shall also deliver to each of SENTRY's  stockholders on
the Closing Date, in accordance with Section 2.3,  certain  warrants to purchase
META Common, as more fully described herein.

          (c)   Each of the parties  hereto agrees that, in accordance  with
     Section 78 of the  Massachusetts  BCL, the Surviving  Corporation (i) shall
keep a copy of this Agreement in the Commonwealth of Massachusetts in one of the
offices  specified in Section 32 of the  Massachusetts BCL for inspection by any
of its  stockholders  or by  any  person  who  was a  stockholder  of any of the
Constituent  Corporations and (ii) shall furnish a copy of this Agreement to any
such stockholder or person upon written request and without charge.

      1.8 Escrow.  (a) The parties hereto agree that State Street Bank and Trust
Company  shall be the escrow agent  (together  with any  successor  escrow agent
appointed pursuant to the Escrow Agreement, the "Escrow Agent").

           (b) The  Escrow  Agent  shall  establish  an escrow  account  for the
purpose of holding certain shares as described below which shall be available to
satisfy claims pursuant to Article IX hereunder. The account shall be titled the
"Escrow  Account."  The Escrow  Account  shall be funded as set forth in Section
1.8(c).
<PAGE> 4

           (c) Escrow Account.  At the Effective Time, META shall deliver to the
Escrow  Agent  for  deposit  in  the  Escrow   Account  shares  of  META  Common
representing  23.05% of the shares of META Common issued to SENTRY  stockholders
pursuant to Section 2.3(a)(1) (the "Escrow Shares").

           (d) All of the Escrow Shares referenced in Section 1.8(c) above shall
be held and  applied  in  accordance  with  Article  IX  herein  and the  Escrow
Agreement.

      1.9 Stockholder  Representative.  The stockholders of SENTRY, by virtue of
their approval of this Agreement, will be deemed to have irrevocably constituted
and appointed, effective as of the Effective Time, Peter A. Naber (together with
his permitted successors, the "Stockholder  Representative"),  as their true and
lawful agent and attorney-in-fact to enter into any agreement in connection with
the   transactions   contemplated   by  this  Agreement  and  any   transactions
contemplated  by the Escrow  Agreement,  to  exercise  all or any of the powers,
authority and discretion conferred on him under any such agreement, to waive any
terms  and   conditions   of  any  such   agreement   (other   than  the  Merger
Consideration),  to give and  receive  notices  on their  behalf and to be their
exclusive  representative  with respect to any matter,  suit,  claim,  action or
proceeding  arising with  respect to any  transaction  contemplated  by any such
agreement,  including, without limitation, the defense, settlement or compromise
of any claim, action or proceeding for which META or the Company may be entitled
to indemnification and the Stockholder  Representative  agrees to act as, and to
undertake the duties and responsibilities  of, such agent and  attorney-in-fact.
This power of  attorney  is coupled  with an interest  and is  irrevocable.  The
Stockholder Representative shall not be liable for any action taken or not taken
by him in  connection  with his  obligations  under this  Agreement (i) with the
consent of  stockholders  who, as of the date of this  Agreement  owned at least
sixty-six and two-thirds percent (66-2/3%) in interest of the outstanding shares
of SENTRY  Common or (ii) in the absence of his own gross  negligence or willful
misconduct.  If the Stockholder  Representative  shall be unable or unwilling to
serve in such capacity, his successor shall be named by those persons holding at
least  sixty-six and two-thirds  percent  (66-2/3%) in interest of the shares of
SENTRY Common outstanding at the Effective Time who shall serve and exercise the
powers of Stockholder Representative hereunder.


                                  ARTICLE II

         CONVERSION AND EXCHANGE OF SECURITIES; MERGER CONSIDERATION

     2.1 Shares of the  Surviving  Corporation.  The  authorized  number and par
value of shares of all classes of stock of the Company  immediately prior to the
Effective  Time  shall be the  authorized  number and par value of shares of the
classes of stock of the Surviving Corporation from and after the Effective Time.

     2.2  Coversion of Company  Common.  At the  Effective  Time,  each share of
Common Stock,  par value $.01 per share,  of the Company issued and  outstanding
immediately  prior to the  Effective  Time  shall,  by virtue of the  Merger and
without any action on the part of the holder thereof, automatically be converted
into and represent one validly  issued,  fully paid and  nonassessable  share of
Common Stock, par value $.01 per share, of the Surviving Corporation.

<PAGE> 5

     2.3   Conversion of SENTRY Securities; Warrants; Contingent
Consideration; Limitation on Shares of META Common; Book Escrow Release

           (a) Merger Consideration. At the Effective Time, each share of SENTRY
Common issued and  outstanding  immediately  prior to the Effective  Time (other
than shares of SENTRY Common held in the treasury of SENTRY,  which shall not be
considered as outstanding  for purposes of this  Agreement,  held by META or any
subsidiary of META, or which are Dissenting  Shares (as defined  herein)) shall,
by  virtue of the  Merger  and  without  any  action  on the part of the  holder
thereof, automatically be canceled and extinguished and converted into the right
to  receive,  net of  withholding  and other  taxes  (collectively,  the "Merger
Consideration"), the following:

                 (1) that  number of shares of META  Common  that is obtained by
           (x) dividing $5,000,000 by the META Closing Price (as defined herein)
           and (y)  dividing  the  result  by the total  number  of  issued  and
           outstanding   shares  of  SENTRY  Common  immediately  prior  to  the
           Effective Time (the "Exchange Ratio");

                 (2) (A)  warrants  (collectively,  the  "Currently  Exercisable
           Warrants")  to purchase  that number of shares of META Common that is
           obtained  by  dividing  125,000  by the total  number  of issued  and
           outstanding   shares  of  SENTRY  Common  immediately  prior  to  the
           Effective Time, which Currently  Exercisable Warrants shall be in the
           form of the common stock purchase  warrant attached hereto as Exhibit
           D-1, and

                 (B)  warrants  (collectively,   the  "Contingently  Exercisable
           Warrants",  and together with the Currently Exercisable Warrants, the
           "Warrants")  to purchase that number of shares of META Common that is
           obtained  by  dividing  75,000  by the total  number  of  issued  and
           outstanding   shares  of  SENTRY  Common  immediately  prior  to  the
           Effective Time, which Contingently  Exercisable  Warrants shall be in
           the form of the common  stock  purchase  warrant  attached  hereto as
           Exhibit D-2 (the  consideration  set forth in Sections  2.3(a)(1) and
           (2), collectively, the "Initial Consideration");

                 (3) the  right to  receive  the  Contingent  Consideration  (as
           defined in Section  2.3(e)(i)),  if any, on a per share basis payable
           pursuant to, and in accordance with, Section 2.3(e); and

                 (4) the right to receive Book Escrow Payments, if any, on a per
           share basis payable pursuant to Section 2.3(g).

Applicable  withholding  taxes  shall be  deducted  before  payment is made with
respect to any Merger Consideration, and META shall be entitled to so withhold.

           (b) At the  Effective  Time,  each share of SENTRY Common held (i) in
the treasury of SENTRY or (ii) by META or any  subsidiary  of META,  immediately
prior to the  Effective  Time  shall,  by virtue of the Merger and  without  any
action on the part of the holder thereof,  automatically be canceled and retired
and all rights in respect thereof shall cease to exist.

           (c) If between the date of this Agreement and the Effective Time, the
outstanding  shares of META  Common or SENTRY  Common  shall  have been  changed
(subject  to  compliance  with the  applicable  provisions  of Article V) into a
different  number  of  shares  or a  different  class,  by  reason  of any stock
dividend,  subdivision,  reclassification,  split-up,  combination,  exchange of
shares or the like,  the  Exchange  Ratio  (and the  calculation  of  Contingent
Consideration pursuant to Section 2.3(e)) shall be appropriately adjusted.
<PAGE> 6

           (d) Each  certificate  representing  shares of META  Common  and each
Warrant to be issued in the Merger or as Contingent Consideration, if any, shall
bear a legend substantially in the following form:

            THE  SECURITIES  REPRESENTED  BY  THIS  CERTIFICATE  HAVE
            NOT BEEN REGISTERED  UNDER THE SECURITIES ACT OF 1933, AS
            AMENDED, AND MAY NOT BE OFFERED, SOLD OR OTHERWISE TRANSFERRED,
            PLEDGED OR HYPOTHECATED UNLESS AND UNTIL SUCH SECURITIES ARE
            REGISTERED UNDER SUCH ACT OR AN OPINION OF COUNSEL
            SATISFACTORY TO META IS OBTAINED TO THE EFFECT THATSUCH
            REGISTRATION IS NOT REQUIRED.

           (e)  Contingent Consideration.

                 (i) Subject to the terms and provisions of this Agreement, META
shall,  or shall cause the Surviving  Corporation  to, pay to the persons and/or
entities who were holders or their  permitted  transferees  (the "Former  SENTRY
Holders")  of SENTRY  Common  issued and  outstanding  immediately  prior to the
Effective Time (other than shares of SENTRY Common (x) (for the sake of clarity)
held in the treasury of SENTRY,  (y) held by META or any  subsidiary  of META or
(z)  which  are  Dissenting   Shares),   an  amount,  if  any  (the  "Contingent
Consideration"), calculated as follows:

           (A) in the  event the  Surviving  Corporation  Revenues  are at least
                   *      and the Surviving  Corporation Operating Margin is at
               least  * , an aggregate amount equal to $7,000,000,  payable in
               accordance with this Section 2.3(e).

           (B) in the event:

                 (I)the Surviving  Corporation Revenues are at least    *
                    and the Surviving  Corporation  Operating Margin is at least
                      *   but less than   *   or

                 (II)the Surviving  Corporation Revenues are at least    *
                     but less than    *         and the  Surviving  Corporation
                     Operating Margin is at least   *  ,

                 an aggregate amount equal to $5,950,000,  payable in accordance
                 with this Section 2.3(e).

           (C) in the event:

                 (I)  the Surviving  Corporation  Revenues are at least  
                         *      and the Surviving Corporation Operating 
                      Margin is at least  *    but less than  *   , or
<PAGE> 7

                 (II) the Surviving  Corporation Revenues are at least 
                          *    but less than    and the  Surviving
                      Corporation Operating Margin is at least  *   but less 
                      than  *  , or

                 (III)the   Surviving   Corporation   Revenues  are  at  least
                         *        but  less  than    *         and the  
                      Surviving Corporation Operating Margin is at least  *  ,

                 an aggregate amount equal to $3,500,000,  payable in accordance
                 with this Section 2.3(e).

           (D) in the event:

                 (I)  the Surviving  Corporation Revenues are at least 
                            *    and the Surviving  Corporation  Operating 
                      Margin is at least   *     but less than    *    , or

                 (II) the Surviving  Corporation  Revenues are at least  
                          *     but less than    *      and the  Surviving
                      Corporation  Operating  Margin is at least   *   but less
                      than   *  , or

                 (III)the Surviving Corporation Revenues  are  at  least
                            *     but  less  than     *       and the Surviving
                      Corporation Operating Margin is at least   *   but less
                      than   *  , or

                 (IV) the Surviving Corporation Revenues are at least   *
                      but less  than      *      and the  Surviving Corporation
                      Operating Margin is at least  *   ,

                 an aggregate amount equal to $1,750,000,  payable in accordance
                 with this Section 2.3(e).

                 (ii)  Neither  META  nor the  Surviving  Corporation  shall  be
     required  to  pay  any  Contingent   Consideration   unless  the  Surviving
     Corporation  meets or  exceeds  the  financial  goals set forth in  Section
     2.3(e)(i),  which  shall be in META's  sole  determination,  subject to the
     right of dispute set forth in Section 2.3(e)(viii).

                 (iii) The Contingent  Consideration,  if any, shall in no event
     whatsoever exceed $7,000,000 in the aggregate.

                 (iv) The right to receive the Contingent Consideration, if any,
     payable  pursuant  to  this  Agreement  is a  contract  right  only  and no
     certificate evidencing such right shall be issued. The right to receive the
     Contingent Consideration pursuant to the Merger shall not be transferred or
     assigned,  except  (a) to a  partner  of a  SENTRY  Stockholder  which is a
     partnership, (b) by will or the laws of descent and distribution,  (c) to a
     spouse  or  child  of a  SENTRY  Stockholder,  or a trust of which a SENTRY
     Stockholder or his or her spouse or child is the  beneficiary  and (d) to a
     beneficiary  of a trust  of  which a  SENTRY  Stockholder  is the  trustee;
     provided that the  transferring  SENTRY  Stockholder  notifies META of such
     distribution  in  writing,  provides  META with the  transferee's  name and
     address and the exact  rights  transferred  and such  transferee  agrees in
     writing (in form and substance reasonably satisfactory to META) to be bound
     by the terms and conditions of this Agreement.
<PAGE> 8

                 (v)  Applicable  withholding  and other taxes shall be deducted
     before payment is made with respect to Contingent Consideration, if any.

                 (vi) Subject to Section 2.3(f),  Contingent  Consideration, if
     any, shall be payable as follows:

                     (A)  the  Former  SENTRY  Holders  shall  be  paid in the
           aggregate  that  number  of  shares  of  META  Common  equal  to  the
           applicable  dollar amount of Contingent  Consideration (as calculated
           pursuant  to  Section  2.3(e)(i)  and  as  adjusted,  if  applicable,
           pursuant  to the  proviso  to  this  sentence)  divided  by the  META
           Contingent  Closing  Price (as  defined in Section  10.9);  provided,
           however,  that,  notwithstanding  any other term or provision in this
           Agreement,  META may pay  all,  or any  portion  of,  the  Contingent
           Consideration  in cash at its sole election and shall pay  Contingent
           Consideration in cash to the extent the share limitation set forth in
           Section 2.3(f) is invoked as to shares issuable pursuant to the first
           part of this sentence. If not all of the Contingent  Consideration is
           to be paid in cash, the applicable  dollar amount  referred to in the
           first part of this sentence shall be reduced,  dollar for dollar, for
           any cash so paid.

                     (B) Contingent Consideration, if any, shall be paid to each
           Former  SENTRY  Holder  pro  rata  based  on the  ratio  the  Initial
           Consideration  received by such  holder on the Closing  Date bears to
           the total amount of Initial Consideration paid on the Closing Date to
           all Former SENTRY Holders. Contingent Consideration, if any, shall be
           paid on a date  (as may be  extended  by  Section  2.3(e)(viii),  the
           "Contingent  Closing  Date") chosen by META,  provided that such date
           shall be within  forty-three  (43) days after the  audited  financial
           statements  of the Surviving  Corporation  for the fiscal year ending
           December 31, 1999 are released by the Surviving  Corporation Auditors
           (as defined herein).

                 (vii) Amounts of  Contingent  Consideration,  if any,  shall be
           paid  pursuant to this  Section  2.3(e) only when the amount  payable
           exceeds an amount equal to (A) the aggregate amounts set forth in all
           Notices of Claim (as defined herein) delivered by all Indemnitees (as
           defined herein) on or prior to the Contingent  Closing Date that have
           not been withdrawn or paid,  irrespective of whether any such Notices
           of Claim  have  been  disputed  pursuant  to the terms  hereunder  or
           otherwise,  reduced  by (B) the  value  of the  Escrow  Account.  The
           amounts  that would  otherwise  be payable  pursuant to this  Section
           2.3(e), but for the operation of this Section  2.3(e)(vii),  shall be
           segregated by META into a separate  interest  bearing  account.  Such
           amounts  shall only be paid by META if,  when and to the extent  such
           Notices of Claim are withdrawn or paid in full.

                       (viii)

                 (A) As  soon as  practicable  following  the end of the  twelve
     month  period  ending  December 31,  1999,  META shall cause the  Surviving
     Corporation  Auditors to audit the financial  statements  for the Surviving
     Corporation for the year ending December 31, 1999,  which  statements shall
     be prepared in accordance  with generally  accepted  accounting  principles
     applied on a consistent basis and consistent with the accounting principles
     on the basis of which SENTRY's audited financial  statements for the twelve
<PAGE> 9

     month period ended  December 31, 1997 were prepared  except with respect to
     the  assumptions  specified in Schedule 2.3(e) which is attached hereto and
     incorporated  herein  by  reference.  META  shall  use such  financials  to
     promptly prepare a written calculation of the Contingent Consideration,  if
     any,  payable in respect  of such  period and shall  deliver a copy of each
     such calculation with reasonable  back-up data and a statement  showing the
     method of computing each of the Contingent  Consideration (if any) together
     with the audited financials to the Stockholder  Representative  within five
     (5) days after such  financials  are released by the Surviving  Corporation
     Auditors.  The Stockholder  Representative agrees to keep such calculations
     and   financials   (and  other   delivered   materials   and   information)
     confidential;  provided;  however;  that  nothing  in this  sentence  shall
     prevent  the  Stockholder  Representative  from using such  information  to
     exercise his right to dispute the calculation as set forth below or to file
     any required tax returns.

                 (B) If the  Stockholder  Representative  disagrees  with META's
     calculations  (whether the  disagreement  relates to the  arithmetic of the
     calculations  or the items or amounts used in  calculating  the  Contingent
     Consideration),  the Stockholder  Representative  may, within 30 days after
     delivery of the documents referred to in Section  2.3(e)(viii) (A), deliver
     a notice to META  disagreeing  with any of such  calculations  and  setting
     forth  the  Stockholder  Representative's  calculation  of  the  Contingent
     Consideration.  Any such notice of disagreement shall specify in reasonable
     detail  those items or amounts as to which the  Stockholder  Representative
     disagrees.  Upon receipt of any such notice,  the  Contingent  Closing Date
     specified  in Section  2.3(e)(i)  shall be extended to afford a  reasonable
     period  of  dispute  resolution  (agreed  upon by META and the  Stockholder
     Representative)  in accordance with this  Agreement.  While the Stockholder
     Representative  is reviewing the calculations of Contingent  Consideration,
     if any, and the other materials  delivered to him during such 30-day period
     he  shall be  entitled  to make  reasonable  requests  to META for  back-up
     information   in   connection   with   the   calculations   of   Contingent
     Consideration, if any.

                 (C) If the  Stockholder  Representative  shall have delivered a
     notice of  disagreement  within  the 30 day period  referred  to in Section
     2.3(e)(viii) (B), the Stockholder  Representative  and META, shall,  during
     the 15 days  following  such  delivery,  use good  faith  efforts  to reach
     agreement  on the  disputed  items or  amounts  in order to  determine  the
     Contingent  Consideration.  If the Stockholder  Representative and META are
     unable to reach  agreement,  they shall promptly  thereafter  cause Ernst &
     Young, LLP (the "Accounting Referee") promptly to review the disputed items
     or amounts for the purpose of calculating the Contingent Consideration.  In
     making such calculations,  the Accounting Referee shall consider only those
     items or amounts in META's calculations of the Contingent  Consideration as
     to which the  Stockholder  Representative  has  disagreed  in writing.  The
     Accounting Referee shall deliver to the Stockholder Representative and META
     as promptly as practicable, a report setting forth the Accounting Referee's
     calculation of the disputed amounts. Such report shall be final and binding
     upon the Stockholder  Representative,  META and the Surviving  Corporation.
     The cost of such review and report  shall be borne by both the  Stockholder
     Representative and META as follows:  each such party shall pay a portion of
     the total cost according to the percentage  obtained by multiplying  100 by
     the  quotient  obtained by  dividing  (A) the  difference  between (i) such
     party's   calculation  of  the  disputed  item  and  (ii)  the  calculation
     determined by the Accounting Referee; by (B) the difference between (i) the
     calculation  determined by META and (ii) the calculation  determined by the
     Stockholder Representative.
<PAGE> 10

                 (ix)  Right  of  Offset.  In  addition  to  any  rights  now or
     hereafter  granted  under  applicable  law or  otherwise  and not by way of
     limitation of any such rights,  META, the Surviving  Corporation and/or any
     Indemnitee shall have the right to offset the Contingent Consideration,  if
     any, payable  pursuant to this Section 2.3(e),  against the amounts payable
     to META,  the  Surviving  Corporation  and/or any  Indemnitee  pursuant  to
     Article  IX of  this  Agreement.  To the  extent  META  elects  to pay  the
     Contingent  Consideration,   if  any,  in  cash  (as  provided  by  Section
     2.3(e)(vi)  and/or  Section  2.3(f) of this  Agreement)  and any Notices of
     Claim  remaining  outstanding  at such time are the subject of a dispute by
     the Stockholder Representative,  then META agrees to first offset such cash
     Contingent  Consideration,  if any, payable pursuant to this Section 2.3(e)
     against  amounts  payable to META,  the  Surviving  Corporation  and/or any
     Indemnitee  pursuant to Article IX of this Agreement and/or any outstanding
     Notices of Claim before  satisfying any remaining  amounts payable to META,
     the Surviving  Corporation and/or any such Indemnitee with Escrow Shares or
     otherwise.

                 (x) Exchange Requirement; Method of Delivery. Only those SENTRY
     Stockholders who have properly  transmitted their  Certificates (as defined
     herein)  to  the  Exchange  Agent  (as  defined  herein)  pursuant  to  the
     instructions  contained  in this  Agreement  shall  receive the  Contingent
     Consideration,  if  any,  paid  or  payable  pursuant  to  this  Agreement.
     Contingent  Consideration,  if any,  payable  hereunder  in cash or in META
     Common  shall be  delivered  by mail by the  Exchange  Agent to each SENTRY
     Stockholder at his, her or its address listed on the stock transfer records
     of SENTRY  immediately  prior to the Effective  Time (unless  notice of any
     change  thereof is given to each of META and the Surviving  Corporation  in
     writing by any such  holder) as soon as  practicable  after the  Contingent
     Closing Date.

                  (xi)  Warrant  Value.   Each  party  hereto  and  each  SENTRY
     Stockholder  by his, her or its approval of this  Agreement  hereby  agrees
     that each  Warrant to purchase one share of META Common shall be valued for
     the purposes of this Agreement by Orchid Partners,  Inc. ("Orchid"),  which
     value shall be evidenced  by a letter from Orchid  delivered on or prior to
     the Closing.

           (f)  Limitation on META Common  Issuable.  Notwithstanding  any other
term or provision of this  Agreement  but subject to the  provisions  of Section
2.3(e)(vi)(A),  META shall not be required to issue (by exchange,  conversion or
otherwise) more than 2,159,720  shares of META Common  (including  shares issued
upon exercise of the Warrants and any other shares which the  Marketplace  Rules
of The Nasdaq Stock Market (as  interpreted by The Nasdaq Stock Market)  require
be so counted) under the terms of this Agreement.

           (g) Book  Escrow.  Any amounts (net of  applicable  federal and state
corporate income taxes) (the "Book Escrow  Payments")  released to the Surviving
Corporation by the escrow agent named in the Asset Purchase Agreement,  dated as
of May 29, 1998 between SENTRY and Wiesner Publishing  Company,  LLC ("Wiesner")
(the "Book  Purchase  Agreement,"  and together  with all closing  documentation
related thereto,  the "Book Closing Documents") in accordance therewith and with
the Escrow  Agreement dated as of May 29, 1998 by and among SENTRY,  Wiesner and
U.S. Bank National Association, as escrow agent, shall be payable, if at all, to
each SENTRY Stockholder,  pro rata based on the ratio the Initial  Consideration
received  by such holder on the  Closing  Date bears to the total  amount of the
Initial  Consideration paid on the Closing Date to all SENTRY  Stockholders (and
META shall cause the Surviving  Corporation to make any such payment).  Payment,
if any, of any Book  Escrow  Payments  shall be made,  if at all, by META or the
Surviving  Corporation  to the  SENTRY  Stockholders  in  accordance  with  this
<PAGE> 11

Agreement and within thirty (30) business days of the  unconditional  release to
the Surviving Corporation of any such amounts.

  
     2.4 Exchange Agent. META shall act as the agent for SENTRY stockholders for
purposes  of  surrender   and  exchange  of  SENTRY   Common  and   distributing
consideration to SENTRY stockholders (the "Exchange Agent").

     2.5 No  Fractional  META  Common  or  Warrants.  Notwithstanding  any other
provision  of this  Agreement,  neither  certificates  nor scrip for  fractional
shares of META Common  shall be issued to any holder of SENTRY  Common under the
provisions of this Agreement and the holder thereof shall not be entitled to any
voting or other  rights of a holder of shares for a fractional  share  interest.
Each holder of shares of SENTRY Common who otherwise would have been entitled to
receive a fraction of a share of META Common (after  aggregating  all fractional
shares of META Common to be received by such holder  other than  represented  by
Warrants)  shall  receive in lieu  thereof  cash  (rounded to the nearest  whole
cent),  without  interest and net of withholding  and other taxes,  in an amount
determined by multiplying  such holder's  fractional  interest by the last sales
price  per  share  of the META  Common  on the  Nasdaq  National  Market  on the
second-to-last  trading day immediately  preceding the Closing Date. Each holder
of shares of SENTRY Common who  otherwise  would have been entitled to receive a
Warrant to purchase a fraction of a share of META Common  shall not receive cash
in lieu thereof. The number of shares issuable pursuant to the Warrants shall be
rounded  down to the  nearest  whole  number.  All amounts of cash in respect of
fractional interests which have not been claimed at the end of one year from the
Effective Time by surrender of certificates for shares of SENTRY Common shall be
repaid to the  Surviving  Corporation,  subject to the  provisions of applicable
escheat or similar laws, for the account of the holders entitled thereto.

     2.6  Distribution  of META Common and Warrants. (a) As soon as practicable
after the Effective Time and upon the receipt of the Certificates,  the Exchange
Agent shall distribute (i) the META Common as provided in this Section 2.6, (ii)
any cash in respect of fractional  shares as provided in Section 2.5,  (iii) the
Warrants  pursuant  to Section  2.3(a) and (iv) the Escrow  Shares to the Escrow
Agent in accordance with the Escrow  Agreement.  The Exchange Agent shall not be
entitled to vote or exercise any rights of ownership  with respect to any shares
of META  Common  held by it from time to time  hereunder,  except  that it shall
receive and hold all dividends or other  distributions  paid or distributed with
respect to such shares for the account of the persons entitled thereto.

           (b) At the Effective Time, each holder of an outstanding  certificate
or certificates for shares of SENTRY Common  (collectively,  the "Certificates")
shall cease to have any rights as a stockholder  of SENTRY,  except such rights,
if any, as such holder may have with  respect to  Dissenting  Shares.  Each such
holder of an outstanding  Certificate or  Certificates  converted in the Merger,
upon  surrender of each such  Certificate to the Exchange  Agent,  shall receive
promptly  in  exchange for each such  Certificate  the  shares of META  Common,
Warrants  and cash for fractional  shares  (if any) to  which  such  holder  is
entitled  pursuant  to Sections  2.3 and 2.5 of this  Agreement.  Pending  such
surrender and exchange, such holder's Certificate or Certificates for shares of
SENTRY  Common  shall be deemed for all  corporate  purposes,  by virtue of the
Merger and  without any action on the part of the holder  thereof,  to evidence
only the right to receive the shares of META Common, Warrants, cash (if any) and
Contingent Consideration, if any, and Book Escrow Payments, if any, provided for
under this Agreement. Unless and until any such outstanding  Certificates shall
be so  surrendered, no dividend (cash or stock) payable to holders of record of
shares of META Common as of any date  subsequent to the Effective  Time shall be
paid to the holder of any such outstanding Certificate and his, her or its other
rights as a stockholder of META shall be suspended,  but upon such surrender of
<PAGE> 12

such Certificate  there shall be paid to the record holder of the certificate of
shares of META Common issued in exchange  therefor the amount of  dividends,  if
any,  without interest and less any taxes which may have been imposed  thereon,
that have theretofore  become payable with respect to the number of those shares
of META Common  represented by such  certificate  issued upon such surrender and
exchange,  and his,  her or its other rights as a  stockholder  of META  shall
thereafter be restored.

     2.7 Closing of Stock Transfer  Books.  The stock  transfer books of SENTRY
shall be  closed  at the close of  business  on the  business  day  immediately
preceding the Effective Time. In the event of a transfer of ownership of SENTRY
Common which is not registered in the transfer records of SENTRY,  the shares of
META  Common,  Warrants, cash for  fractional  shares  (if any) and  Contingent
Consideration, if any, and Book Escrow Payments, if any, to be issued or payable
in  accordance with this Agreement  may be delivered to a  transferee,  if the
certificate representing such SENTRY Common is presented to the Exchange Agent,
accompanied by all documents  required to evidence and effect such transfer and
by payment of any applicable stock transfer taxes.

     2.8 Dissenting Shares. Shares of SENTRY Common that have not been voted for
adoption of this Agreement and with respect to which appraisal rights shall have
been properly  perfected in accordance with Section 85 of the  Massachusetts BCL
(the  "Dissenting  Shares")  shall not be  converted  into the right to  receive
shares of META Common, Warrants, cash (if any) and Contingent Consideration,  if
any, and Book Escrow  Payments,  if any, in accordance with this Agreement at or
after the Effective Time,  unless and until the holder of such Dissenting Shares
withdraws his, her or its demand for such  appraisal in accordance  with Section
96 of the  Massachusetts  BCL or shall  fail to  perfect  or  otherwise  becomes
ineligible for such appraisal, in any case pursuant to the Massachusetts BCL. If
a holder of Dissenting  Shares shall withdraw (in accordance  with Section 96 of
the Massachusetts BCL) his, her or its demand for such appraisal,  shall fail to
perfect or otherwise becomes ineligible for such appraisal, in any case pursuant
to the  Massachusetts  BCL,  then, as of the later of the Effective  Time or the
occurrence  of such event,  such  holder's  Dissenting  Shares shall cease to be
Dissenting  Shares  and shall be  converted  into the right to  receive  (net of
withholding  and other  taxes) the  consideration  specified in Section 2.3 with
respect to such shares of SENTRY Common,  without interest thereon,  which shall
be payable in accordance with this Agreement.  Any amounts to be paid to holders
of Dissenting Shares with respect to such Dissenting Shares shall be paid by the
Surviving Corporation.

     SENTRY  shall give META (i) prompt  notice of any demands for  appraisal of
shares  of  SENTRY  Common  received  by  SENTRY  and  (ii) the  opportunity  to
participate in and direct all  negotiations  and proceedings with respect to any
such demands.  SENTRY shall not, without the prior written consent of META, make
any payment with respect to, or settle,  offer to settle or otherwise negotiate,
any such demands.

     2.9  No  Liability.  Notwithstanding  anything  to  the  contrary  in  this
Agreement,  neither the  Surviving  Corporation  nor any party  hereto  shall be
liable to a holder of shares of SENTRY Common for any amount  properly paid to a
public  official  pursuant  to any  applicable  abandoned  property,  escheat or
similar law.

     2.10 Withholding Rights. META, the Company and SENTRY shall be entitled to
deduct and withhold from the  consideration  otherwise  payable pursuant to this
Agreement to any SENTRY  Stockholder such amounts as META, the Company or SENTRY
determine they are required to deduct and withhold with respect to the making of
such payment under the Code, or any  provision of state,  local,  or foreign tax
law. To the extent that amounts are so withheld,  such withheld amounts shall be
<PAGE> 13

treated for all purposes  hereof as having been paid to the holder of the shares
in respect of which such deduction and  withholding was made. To the extent that
the amount so required  to be deducted or withheld  from any payment to a holder
exceeds the cash portion of the  consideration  otherwise payable to the holder,
META, the Company and SENTRY are hereby  authorized to sell or otherwise dispose
of at fair market  value such portion of such  consideration  as is necessary to
provide  sufficient funds to META, the Company or SENTRY, as the case may be, in
order to enable it to comply with such deduction or withholding requirement.

                                 ARTICLE III

                   REPRESENTATIONS AND WARRANTIES OF SENTRY

     SENTRY hereby represents and warrants to each of META and the Company as of
the date hereof and as of the Effective  Time that the  statements  contained in
this  Article III are true and  correct,  except as set forth in the  disclosure
schedules  delivered in connection  with this Agreement (the  "Schedules").  The
Schedules  shall be  initialed  by SENTRY and shall be  arranged  in  paragraphs
corresponding to the numbered and lettered paragraphs  contained in this Article
III, and the disclosure in any paragraph of the Schedules  shall qualify only to
the corresponding paragraph in this Article III, unless clearly cross-referenced
to another paragraph:

     3.1  Corpoartate   Existence  and  Power.  SENTRY  is  a  corporation  duly
incorporated,  validly  existing  and in good  standing  under  the  laws of the
Commonwealth  of  Massachusetts  and  has  all  corporate  power  and  authority
necessary to enable it to own, lease or otherwise hold its properties and assets
and to carry on its business as now  conducted.  SENTRY is duly  qualified to do
business as a foreign  corporation and is in good standing in each  jurisdiction
where the  character of the property  owned or leased by it or the nature of its
activities makes such qualification  necessary,  except for those  jurisdictions
where the failure to be so qualified  would not have a material  adverse  effect
upon the  financial  condition,  results of  operations,  business,  properties,
assets or  operations  of SENTRY (a "Material  Adverse  Effect on SENTRY").  All
jurisdictions  in which  SENTRY is so  qualified  to do  business  are listed in
Schedule 3.1.  SENTRY has previously  delivered to META and the Company true and
complete  copies of the  articles  of  organization  and  by-laws of SENTRY,  as
amended  to date  and as  currently  in  effect,  and all  minutes  of  meetings
(including  actions  in lieu  thereof)  of the  board  of  directors  (and  each
committee thereof) and stockholders of SENTRY.

     3.2 Corporate Authorization (a) The execution,  delivery and performance by
SENTRY of this Agreement, and the consummation by SENTRY of the Merger and other
transactions  contemplated  hereby  are  within  SENTRY's  corporate  power  and
authority,  and have been duly authorized by all necessary corporate action. The
Board  of  Directors  of  SENTRY  has  (i)  approved  this  Agreement,  and  the
transactions  contemplated  hereby and  thereby,  including  the Merger and (ii)
resolved  to submit  this  Agreement  to the  stockholders  of SENTRY  for their
approval.  This  Agreement has been duly  authorized,  executed and delivered by
SENTRY and  constitutes a valid and binding  obligation  of SENTRY,  enforceable
against SENTRY in accordance with its terms.

           (b) The affirmative vote of the holders of at least two-thirds of the
outstanding shares of SENTRY Common,  voting together as a single class, are the
only votes of SENTRY's capital stock necessary to approve this Agreement.
<PAGE> 14

     3.3 Governmental Authorization.  The execution, delivery and performance by
SENTRY  of  this  Agreement,  and  the  consummation  of the  Merger  and  other
transactions  contemplated  by this  Agreement  by  SENTRY,  do not and will not
require any consent, approval or action by or in respect of, or any declaration,
filing or registration with, any governmental or regulatory body, court, agency,
official or authority  (each, a  "Governmental  Authority"),  other than routine
filings  with  the  Secretary  of  the   Commonwealth  of  the  Commonwealth  of
Massachusetts  (and any required  districts thereof) necessary to consummate the
Merger and as disclosed on Schedule 3.3.

     3.4 Non-Contravention.  Except as disclosed on Schedule 3.4, the execution,
delivery and  performance by SENTRY of this Agreement,  and the  consummation of
the Merger and other  transactions  contemplated by this Agreement by SENTRY, do
not and will not,  with or without  the  giving of notice,  the lapse of time or
both: (i) contravene or conflict with the articles of organization or by-laws of
SENTRY,  (ii) assuming  compliance with the matters  referred to in Section 3.3,
contravene  or conflict  with or  constitute a violation of any provision of any
law, rule, regulation, judgment, injunction, order or decree currently in effect
and binding upon or applicable to SENTRY, (iii) require any consent, approval or
other  action  by any  person,  contravene  or  conflict  with or  constitute  a
violation  of or a default  under,  or give  rise to any  right of  termination,
cancellation  or  acceleration of any right or obligation of SENTRY or to a loss
of any  benefit to which  SENTRY is  entitled,  under any  provision  of (A) any
material agreement,  contract, indenture, lease or other instrument binding upon
SENTRY or (B) assuming  compliance with the matters  referred to in Section 3.3,
any material license,  franchise,  permit or other similar authorization held by
SENTRY or (iv) except for the rights of any holders of Dissenting Shares, result
in the creation or imposition of any mortgage,  pledge, security interest, lien,
claim,  charge,  restriction,  encumbrance  or assessment  of any kind (each,  a
"Lien") on any asset of SENTRY.

     3.5  Capitalization.  The  authorized  capital stock of SENTRY  consists of
12,000,000  shares of SENTRY Common,  of which  6,156,882  shares are issued and
outstanding  and 209,595  shares are held in the treasury of SENTRY.  All issued
and  outstanding  shares of SENTRY  Common are  validly  issued,  fully paid and
nonassessable,  and have not been issued in violation of any  preemptive,  first
refusal or other  subscription  rights of any stockholder of SENTRY or any other
person. Except as set forth on Schedule 3.5, there are no outstanding (i) shares
of capital stock or other voting securities of SENTRY, (ii) securities of SENTRY
convertible  into  or  exchangeable  for  shares  of  capital  stock  or  voting
securities of SENTRY,  (iii) options,  warrants,  exchange rights,  subscription
rights or other  agreements,  commitments  or rights to  purchase  or  otherwise
acquire from SENTRY,  or  agreements,  commitments  or  obligations of SENTRY to
issue or sell, any capital stock,  voting  securities or securities  convertible
into or  exchangeable  for capital stock or voting  securities of SENTRY or (iv)
any  agreement,  commitment or obligation of SENTRY to grant,  or enter into any
such option, warrant, call, right, commitment or agreement (the items in clauses
(i),  (ii)  (iii)  and  (iv)  being  referred  to  collectively  as the  "SENTRY
Securities").  Except as set forth on  Schedule  3.5,  there are no  outstanding
obligations of SENTRY or to repurchase,  redeem or otherwise acquire, any SENTRY
Securities. Schedule 3.5 sets forth a true and complete list of the record, and,
to the knowledge of SENTRY,  the  beneficial,  owners of all SENTRY  Securities.
Schedule  3.5 sets forth,  with  respect to all options and warrants to purchase
shares of  SENTRY  Common,  the  holder  of  record,  the  exercise  price,  the
expiration  date and the vesting  schedule,  including the extent vested to date
and the extent,  if any, to which the  exercisability  of such option or warrant
will be accelerated by the transactions contemplated by this Agreement. Schedule
3.5 shall  set forth the  information  required  by this  Section  3.5 by making
reference  to the name of the holder,  the name of the option plan or  agreement
pursuant to which such SENTRY  Security  was issued,  the  exercise  price,  the
number of shares  exercisable  and  unexercisable,  vested or unvested,  and all
other similar information.
<PAGE> 15

     3.6 Susidiaries.  SENTRY does not hold or own, directly or indirectly,  any
capital stock or other equity securities of any other  corporation,  or have any
direct or indirect equity or ownership interest in any association, partnership,
joint venture or other entity.

     3.7 Financial  Statements.  SENTRY has previously delivered to META and the
Company  the  following  financial  statements  (collectively,   the  "Financial
Statements"):

           (i) the audited  balance sheets of SENTRY as of December 31, 1997 and
     1996 and the related  statements of  operations,  stockholders'  equity and
     cash flows for each of the years ended  December 31, 1997 and 1996 together
     with the notes  thereto,  in each case audited by, and  accompanied  by the
     report thereon, of KPMG Peat Marwick LLP; and

           (ii) the  unaudited  balance sheet of SENTRY as of June 30, 1998 (the
     "Unaudited  Balance  Sheet") and the related  statements of operations  and
     cash flows for the six months then ended.

Except as set forth in Schedule 3.7, each of the Financial  Statements  has been
prepared in accordance with generally accepted accounting  principles applied on
a consistent  basis and fairly  presents the financial  position of SENTRY as of
its date or the results of  operations  or cash  flows,  as is  appropriate,  of
SENTRY for the periods then ended  (subject,  in the case of  unaudited  interim
financial statements, to recurring year-end adjustments,  which adjustments will
not be  material  in  amount  or  effect).  Except  as may be set  forth  in the
Financial  Statements  or Schedule  3.7, (a) all of the revenues and expenses of
SENTRY  reflected in the  Financial  Statements  were derived or incurred in the
ordinary  course of business of SENTRY and (b)  SENTRY's  books of account  have
been  maintained in accordance  with  generally  accepted  accounting  practices
applied on a consistent  basis.  The account  records  underlying  the Financial
Statements accurately and fairly reflect, in reasonable detail, the transactions
of SENTRY.  Except as set forth in Schedule 3.7, all  accounts,  notes and other
receivables  of SENTRY are valid and  enforceable,  are not subject to any valid
defense,  set off,  counterclaim  or  claim  for  returns  or  refunds,  and are
collectible  in full in  accordance  with their terms in the ordinary  course of
business of SENTRY,  except to the extent of any reserves therefor  reflected on
the  Unaudited  Balance  Sheet or  taken  in the  ordinary  course  of  business
consistent with past practice which in the aggregate are not material to SENTRY.

     3.8 Absence of Undisclosed Liabilities. SENTRY has no material liabilities
or  obligations,  except those  liabilities or  obligations  which are (a) fully
reflected or adequately  reserved  against in the Unaudited  Balance Sheet,  (b)
disclosed in this Agreement or in the Schedules hereto (including Schedule 3.8),
or (c)  incurred  in the  ordinary  course  of  business  consistent  with  past
practice.  To the  knowledge  of  SENTRY,  there is no basis  for any  assertion
against  SENTRY of any material  liability or obligation of any nature or in any
amount not (a) fully reflected or adequately  reserved  against in the Unaudited
Balance Sheet,  (b) disclosed in this Agreement or in the Schedules  hereto,  or
(c) incurred in the ordinary  course of business  consistent with past practice.
For the purposes of this Agreement the phrase "liabilities or obligations" shall
include any direct or indirect indebtedness, claim, loss,  damage,  deficiency
(including  deferred  income  tax and other tax  deficiencies),  cost,  expense,
obligation,   guarantee,  or  responsibility,  whether  accrued,  absolute  or
contingent,  known or unknown,  fixed or unfixed,  liquidated  or  unliquidated,
secured or unsecured.

     3.9 Properties.  Except as set forth in Schedule 3.9, all of the assets and
properties of SENTRY are reflected on the Unaudited Balance Sheet (except to the
extent  not  required  to be  so  reflected  by  generally  accepted  accounting
principles), and SENTRY has good, valid and marketable title to all of its owned
assets and properties,  whether real, personal or mixed, tangible or intangible,
that are material to the business of SENTRY, free and clear of all Liens, except
<PAGE> 16

(a) Liens for current taxes not  delinquent or being  contested in good faith by
appropriate  proceedings,  (b) Liens in connection  with worker's  compensation,
unemployment  insurance or other social  security  obligations,  (c) deposits or
pledges to secure bids, tenders,  contracts (other than contracts or the payment
of money),  leases,  statutory  obligations,  surety and appeal  bonds and other
obligations  of like nature  arising in the  ordinary  course of  business,  (d)
mechanic's, workman's, materialmen's or other like Liens arising in the ordinary
course of business  with respect to  obligations  which are not due or which are
being  contested  in good faith,  and (e) such  imperfections  of title,  Liens,
easements and encumbrances, if any, as are not substantial and do not materially
detract from the value, or materially  interfere with the present use, of any of
the properties subject thereto or affected thereby, or otherwise have a Material
Adverse Effect on SENTRY.

     3.10 Real Property.  Set forth on Schedule 3.10 is an accurate and complete
list and summary  description of all real property  currently owned or leased by
SENTRY and, except as set forth on Schedule 3.10,  none of the described  leases
require any consent to the transactions  contemplated by this Agreement.  SENTRY
has previously delivered to META and the Company accurate and complete copies of
all  leases  listed  and  described  on  Schedule  3.10.  Except as set forth on
Schedule 3.10,  SENTRY has possession of each of the  aforementioned  properties
and, to the knowledge of SENTRY,  no event has occurred which, with the lapse of
time or notice or both,  could  result in a  material  default  under any of the
described  leases.  All rents or other material payment  obligations  which have
become due in respect of each of such leased  properties have been paid,  SENTRY
has complied in all material respects with its obligations under the said leases
and SENTRY has not  received any notice of any breach of its  obligations  under
any covenants, agreements,  statutory requirements,  planning consents, by-laws,
orders  and  regulations  affecting  any of such  properties  (whether  owned or
leased), their use and any business of SENTRY there carried on.

     3.11  Condition  of  Tangible  Assets.   All  material  tangible  property,
including the real property and structures  thereon,  owned by SENTRY is in good
operating  condition,  reasonable wear and tear excepted,  and the operation and
use of such property in the business of SENTRY conforms in all material respects
to  all  applicable  laws,  ordinances,   regulations,   permits,  licenses  and
certificates.

     3.12  Intellectual  Property.  SENTRY  owns,  or is licensed  or  otherwise
possesses  legally  enforceable  rights to use all  patents,  trademarks,  trade
names, service marks, copyrights, and any applications therefor,  maskworks, net
lists,  schematics,   technology,   know-how,   computer  software  programs  or
applications  (in both  source  code and object  code  form),  and  tangible  or
intangible  proprietary  information or material that are used or proposed to be
used in the  business  of  SENTRY as  currently  conducted  currently.  Schedule
3.12(a) lists all patents,  registered and  unregistered  trademarks and service
marks, registered and unregistered copyrights,  trade names and any applications
therefor,  which  relate to or are part of SENTRY's  products or are used in the
business of SENTRY (the "SENTRY  Intellectual  Property Rights"),  and specifies
the jurisdictions in which each such SENTRY  Intellectual  Property Right issued
or registered or in which an application for such issuance and  registration has
been filed, including the respective registration or application numbers and the
names  of all  registered  owners.  Schedule  3.12(b)  lists  (i) all  licenses,
sublicenses  and other  agreements as to which SENTRY is a party and pursuant to
which any person is authorized to use any SENTRY Intellectual  Property Right or
any trade  secret  material  to SENTRY  and  includes  any  SENTRY  Intellectual
Property Right or any trade secret  material to SENTRY and includes the identity
of all parties thereto; and (ii) all licenses,  sublicenses and other agreements
as to which SENTRY is a party and pursuant to which SENTRY is  authorized to use
any third party  patents,  trademarks or copyrights  (including  software)  (the
"SENTRY Third Party  Intellectual  Property  Rights") which are incorporated in,
are, or form a part of, any SENTRY  product,  or other  trade  secret of a third
<PAGE> 17

party in or as to any product, and includes the identity of all parties thereto,
a description of the nature and subject matter thereof,  the applicable  royalty
and the term thereof.

     SENTRY is not, nor will it be as a result of the  execution and delivery of
this Agreement or the performance of its obligations hereunder,  in violation of
any license,  sublicense or agreement  described on Schedule 3.12(b).  No claims
with respect to SENTRY  Intellectual  Property Rights, any trade secret material
to SENTRY,  or SENTRY  Third Party  Intellectual  Property  Rights to the extent
arising out of any use,  reproduction or distribution of such SENTRY Third Party
Intellectual  Rights by or through SENTRY,  have been asserted or are threatened
by any person,  nor, except as disclosed by SENTRY to META in Schedule  3.12(b),
does SENTRY know of any valid grounds for any bona fide claims (i) to the effect
that the manufacture, sale, licensing or use of any product as now used, sold or
licensed  or  proposed  for use,  sale or  license  by SENTRY  infringes  on any
copyright, patent, trademark, service mark or trade secret; (ii) against the use
by SENTRY of any trademarks,  trade names, trade secrets,  copyrights,  patents,
technology,  know-how or computer  software  programs and  applications  used in
SENTRY's  business as  currently  conducted  or as proposed to be  conducted  by
SENTRY;  (iii)  challenging the ownership,  validity or  effectiveness of any of
SENTRY Intellectual Property Rights or other trade secret material to SENTRY; or
(iv) challenging  SENTRY's license or legally  enforceable  right to use, or the
validity or effectiveness of SENTRY Third Party Intellectual Rights.

     All registered trademarks,  service marks and copyrights held by SENTRY are
valid and subsisting. There is no unauthorized use, disclosure,  infringement or
misappropriation of any of SENTRY Intellectual Property Rights, any trade secret
material to SENTRY, or any SENTRY Third Party Intellectual Property Right to the
extent licensed by or through SENTRY, by any third party, including any employee
or former employee of SENTRY.  Except as disclosed by SENTRY to META in Schedule
3.14, SENTRY (i) has not been sued or charged in writing as a defendant  in any
claim,  suit, action or proceeding which involves a claim of infringement of any
patents, trademarks,  service marks, copyrights or violation of any trade secret
or other  proprietary  right of any third  party;  (ii) has no  knowledge of the
basis  for  any  such  charge  or  claim;  and  (iii)  has no  knowledge  of any
infringement  liability with respect to, or infringement or violation by, SENTRY
of any  patent,  trademark,  service  mark,  copyright,  trade  secret  or other
proprietary right of another.

     No SENTRY Intellectual  Property Right, trade secret material to SENTRY, or
SENTRY Third Party  Intellectual  Property  Right is subject to any  outstanding
order, judgment,  decree, stipulation or agreement restricting in any manner the
licensing thereof by SENTRY.  Except for contracts  licensing  SENTRY's products
executed in the ordinary course of business and in accordance with SENTRY's past
practices,  SENTRY has not entered into any  agreement  to  indemnify  any other
person against any charge of infringement of any SENTRY Third Party Intellectual
Property Right.

     SENTRY has taken reasonable  measures  consistent with industry practice to
protect and preserve the validity and enforceability of the SENTRY  Intellectual
Property Rights. No trade secret or confidential  information of SENTRY has been
used,  divulged or appropriated  for the benefit of any person other than SENTRY
or otherwise to the detriment of SENTRY. No employee or consultant of SENTRY has
used any trade secrets or other confidential  information of any other person in
the course of their work for SENTRY.

     SENTRY  has no reason  to  believe  any  employee  of SENTRY  is, or is now
expected to be, in  violation  of any term of any  employment  contract,  patent
disclosure  agreement,   proprietary   information   agreement,   noncompetition
agreement,  nonsolicitation  agreement,  confidentiality agreement, or any other
similar contract or agreement or any restrictive  covenant relating to the right
<PAGE> 18

of any such  employee to be employed or engaged by SENTRY  because of the nature
of the business conducted or to be conducted by SENTRY or relating to the use of
trade secrets or proprietary  information of others and the continued employment
or retention of its  employees  does not subject  SENTRY to any  liability  with
respect to any of the foregoing matters.

     3.13 Absence of Certain  Changes.  Except as  disclosed  in Schedule  3.13,
since June 30, 1998 the  business of SENTRY has been  conducted  in the ordinary
course consistent with past practices and there has not been:

            (i) any event, occurrence,  development or state of circumstances or
     facts which has had or could  reasonably be expected to result in or have a
     Material Adverse Effect on SENTRY;

           (ii) any  declaration,  setting  aside or payment of any  dividend or
     other  distribution  with respect to any shares of capital stock of SENTRY,
     or any  repurchase,  redemption  or  other  acquisition  by  SENTRY  of any
     outstanding shares of capital stock or other securities of, or other equity
     or ownership interests in, SENTRY;

          (iii)  any amendment of any material term of any outstanding
     security of SENTRY;

           (iv)  any  incurrence,  assumption  or  guarantee  by  SENTRY  of any
     indebtedness  for  borrowed  money  other  than in the  ordinary  course of
     business and in amounts and on terms consistent with past practices, but in
     any event not exceeding an aggregate of $10,000;

            (v) any creation or  assumption  by SENTRY of any Lien on any asset,
     other than Liens that do not in the aggregate  materially  detract from the
     value of such assets or materially  impair the use thereof in the operation
     of the business of SENTRY;

           (vi) any making of any loan,  advance or capital  contributions to or
     investment   in  any  person   other  than   loans,   advances  or  capital
     contributions  to or investments in wholly owned  subsidiaries  made in the
     ordinary course of business consistent with past practices;

          (vii) any damage,  destruction  or other casualty loss (whether or not
     covered by insurance)  affecting the business or assets of SENTRY which has
     had or would reasonably be expected to result in or have a Material Adverse
     Effect on SENTRY;

         (viii) any acquisitions of any capital assets or any other  investments
     for aggregate consideration in excess of $10,000;

           (ix) any sale,  lease,  pledge,  transfer or other disposition of any
     capital assets for aggregate consideration in excess of $10,000;

            (x) any transaction or commitment made, or any contract or agreement
     entered into, by SENTRY  relating to its assets or business  (including the
     acquisition or disposition of any assets) or any  relinquishment  by SENTRY
     of any contract or other right, in either case,  material to SENTRY,  other
     than transactions,  commitments and  relinquishments in the ordinary course
     of business  consistent with past practices and those  contemplated by this
     Agreement;

           (xi) any change in any method of accounting or accounting practice by
     SENTRY;
<PAGE> 19

          (xii)  any  (A)  grant  of any  severance  or  termination  pay to any
     director,  officer  or  employee  of  SENTRY,  (B)  entering  into  of  any
     employment,  severance,  management,  consulting,  deferred compensation or
     other similar  agreement (or any amendment to any such existing  agreement)
     with any  director,  officer or employee of SENTRY,  (C) change in benefits
     payable under existing severance or termination pay policies or employment,
     severance, management, consulting or other similar agreements or (D) change
     in compensation,  bonus or other benefits payable to directors, officers or
     employees  of  SENTRY,  other  than  increases  in the  ordinary  course of
     business of the  compensation  of the employees  (other than the directors,
     officers and Key Employees (as defined herein)) of SENTRY;

         (xiii) any labor dispute or any activity or proceeding by a labor union
     or  representative  thereof to organize  any  employees  of SENTRY,  or any
     lockouts,  strikes, slowdowns, work stoppages or threats thereof by or with
     respect to any employees of SENTRY; or

          (xiv)  any  agreement,  undertaking  or  commitment  to do  any of the
     foregoing.

     3.14  Litigation.  Except as  disclosed in Schedule  3.14,  (a) there is no
action,  suit,  investigation or proceeding pending against or, to the knowledge
of SENTRY,  threatened against or affecting,  SENTRY or any of its properties or
assets before any court, arbitrator or Governmental Authority; (b) SENTRY is not
subject to any judgment, order or decree entered in any lawsuit or proceeding or
issued by any court, arbitrator or Governmental  Authority;  and (c) there is no
litigation pending or threatened against any officer or Key Employee relating to
SENTRY or its business.

     3.15  Material  Contracts.  (a) Except for  agreements,  contracts,  plans,
leases,  arrangements  or  commitments  disclosed in Schedule  3.15 or any other
Schedule to this Agreement, SENTRY is not a party to or subject to:

            (i)  any collective bargaining agreement;

           (ii) any agreements that contain any unpaid severance  liabilities or
     obligations;

          (iii)  any  bonus,  deferred  compensation,   incentive  compensation,
     pension,  profit-sharing or retirement plans, or any other employee benefit
     plans or arrangements;

           (iv) any employment or consulting  agreement,  contract or commitment
     with an employee or individual  consultant or  salesperson or consulting or
     sales agreement,  contract or commitment with a firm or other  organization
     not terminable by SENTRY on 90 days' notice without liability except to the
     extent   applicable  local  law  and/or  general   principles  of  wrongful
     termination law may limit SENTRY's ability to terminate such employees;

            (v)  agreement or plan,  including,  without  limitation,  any stock
     option plan, stock  appreciation  right plan or stock purchase plan, any of
     the  benefits  of which will be  increased,  or the  vesting of benefits of
     which will be  accelerated,  by the  occurrence of any of the  transactions
     contemplated by this Agreement or the value of any of the benefits of which
     will be calculated on the basis of any of the transactions  contemplated by
     this Agreement;

           (vi) any fidelity or surety bond or completion bond;
<PAGE> 20

          (vii)  any  lease  of  personal  property  having  a  remaining  value
     individually in excess of $10,000;

         (viii)  any agreement of indemnification or guaranty;

           (ix) any  agreement,  contract or commitment  containing any covenant
     limiting the freedom of SENTRY to engage in any line of business or compete
     with any person;

            (x) any  agreement,  contract  or  commitment  relating  to  capital
     expenditures and involving future obligations in excess of $10,000;

           (xi)  any   agreement,   contract  or  commitment   relating  to  the
     disposition or acquisition of assets not in the ordinary course of business
     or any ownership interest in any corporation, partnership, joint venture or
     other business enterprise;

          (xii) any mortgages,  indentures, loans or credit agreements, security
     agreements or other agreements or instruments  relating to the borrowing of
     money or extension of credit,  including  guaranties  referred to in clause
     (viii) hereof;

         (xiii) any purchase order or contract for the purchase of raw materials
     or acquisition of assets involving $10,000 or more;

          (xiv)  any construction contracts;

           (xv)  any distribution, joint marketing or development agreement;
     or

          (xvi) any other  agreement,  contract  or  commitment  which  involves
     $25,000 or more and is not  cancelable  without  penalty within thirty (30)
     days.

     SENTRY has not breached, or received in writing any claim or threat that it
has breached,  any of the terms or conditions of (i) any agreement,  contract or
commitment  set forth in any of SENTRY's  Schedules  or (ii) any other  material
agreement,  contract or  commitment  in such a manner as would  permit any other
party to cancel or  terminate  the same or would  permit any other party to seek
damages from SENTRY that would have a Material Adverse Effect on SENTRY.

           (b) Each agreement, contract, plan, lease, arrangement and commitment
disclosed in any Schedule to this Agreement or required to be disclosed pursuant
to this Section 3.15 (other than those required to be terminated by the terms of
this Agreement) is a valid and binding  agreement of SENTRY and is in full force
and effect,  and SENTRY is not, nor is, to the  knowledge  of SENTRY,  any other
party thereto,  in default or breach in any material  respect under the terms of
any such agreement, contract, plan, lease, arrangement or commitment.

           (c) There is no contract,  agreement,  commitment  or  obligation  to
which SENTRY is a party or is bound that at the time it was entered into or made
was,  or is  currently,  known or  expected  by  SENTRY to result in any loss to
SENTRY upon  completion or  performance  thereof,  or any bid, offer or proposal
which if accepted  would  result as such a contract,  agreement,  commitment  or
obligation.
<PAGE> 21

           (d) Except as  disclosed in Schedule  3.15,  SENTRY is not a party to
any agreement with any of its securityholders or optionholders, or any affiliate
thereof,  nor, to the  knowledge of SENTRY,  without  inquiry by SENTRY,  is any
securityholder or optionholder of SENTRY a party to any agreement with any other
such securityholder or optionholder relating to SENTRY or any of its securities.

      3.16 Taxes. (a) The term "Taxes" as used herein means all federal,  state,
local, foreign and other net income,  gross income, gross receipts,  sales, use,
ad valorem, transfer,  franchise, profits, license, lease, service, service use,
withholding, payroll, employment, excise, severance, stamp, occupation, premium,
property,    windfall   profits,   customs   duties,   unemployment   insurance,
environmental,  worker's  compensation,  Pension  Benefit  Guaranty  Corporation
premiums and all other taxes,  fees,  assessments  or other  charges of any kind
similar to Taxes, together with any interest and any penalties, additions to tax
or additional amounts with respect thereto,  and the term "Tax" means any one of
the  foregoing  taxes.  The term  "Returns"  as used herein  means all  returns,
declarations,  reports,  statements and other documents  required to be filed in
respect of Taxes,  including  information  returns or  reports  with  respect to
backup  withholding and other payments to third parties,  and "Return" means any
one of the  foregoing  returns.  All  citations to the Internal  Revenue Code of
1986,  as  amended  (the  "Code"),  or  the  Treasury  Regulations   promulgated
thereunder,  shall  include  any  amendments  or  any  substitute  or  successor
provisions thereto. The representations and warranties contained in this Section
3.16 shall pertain to the period from SENTRY's inception up to and including the
Effective Time.

            (b) SENTRY has filed all  Returns  required to be filed by or on its
behalf on a timely basis and such Returns are true,  complete and correct.  None
of the Returns filed or required to be filed by SENTRY  contains or will contain
a disclosure  statement under former Section 6661 or Section 6662 of the Code or
any similar provision of any state, local or foreign law.

            (c) All Taxes  shown to be  payable  by SENTRY on the  Returns or on
subsequent  assessments  with respect thereto have been paid in full on a timely
basis, and no other Taxes are payable by SENTRY with respect to items or periods
covered by such Returns  (whether or not shown on or reportable on such Returns)
or with  respect  to any  period.  SENTRY has  withheld  and paid over all Taxes
required to have been withheld and paid over by it, and complied in all respects
with all information  reporting and backup withholding  requirements,  including
maintenance of required records with respect thereto, in connection with amounts
paid or owing to any employee,  creditor,  independent contractor or other third
party.  There are no Liens on any of the assets of SENTRY with respect to Taxes,
other than Liens for Taxes not yet due and payable or for ad valorem  Taxes that
SENTRY is contesting in good faith through appropriate proceedings and for which
appropriate  reserves have been established,  which reserves are fully reflected
in the  Financial  Statements;  and no  Liens  will  arise  as a  result  of the
transactions contemplated by this Agreement.

            (d) The  amount  of  SENTRY's  liability  for  unpaid  Taxes for all
periods  does not,  in the  aggregate,  exceed  the  amount  of the net  current
liability accruals for Taxes set forth on the Unaudited Balance Sheet and SENTRY
will incur no additional Taxes  subsequent to the date of the Unaudited  Balance
Sheet until the Effective Time except in the ordinary course of business.

            (e) No issues have been raised  (and are  currently  pending) by any
taxing authority in connection with any of the Returns of SENTRY.  No waivers of
statutes of limitation  with respect to any of the Returns have been given by or
requested from SENTRY. All deficiencies asserted or assessments made as a result
of any examinations  have been fully paid, or are fully reflected as a liability
in the Financial  Statements,  or are being contested and an appropriate reserve
therefor  has  been   established  and  is  fully  reflected  in  the  Financial
<PAGE> 22

Statements. All elections with respect to Taxes affecting SENTRY, as of the date
hereof,  are set forth in the Returns,  other than any such elections  which are
not  required  to be  included  in the  Returns,  copies of which have been made
available  to  Buyer.  SENTRY  is  not  a  party  to  any  agreement,  contract,
arrangement  or plan that has  resulted or would  result,  separately  or in the
aggregate,  in the payment of (i) any  "excess  parachute  payments"  within the
meaning  of  Section  280G of the Code  (without  regard  to the  exceptions  in
Sections  280G(b)(4)  and  280G(b)(5)  of the Code) or (ii) any other amount for
which a deduction  would be  disallowed  under Section 162 or Section 404 of the
Code.  SENTRY  has not  agreed or been  required  to make any  adjustment  under
Section  481(a)  of the Code by  reason  of a change  in  accounting  method  or
otherwise,  and SENTRY  will not be required  to make any such  adjustment  as a
result of the transactions contemplated by this Agreement. SENTRY is not a party
to any safe harbor lease within the meaning of Section 168(f)(8) of the Code, as
in effect prior to amendment by the Tax Equity and Fiscal  Responsibility Act of
1982. SENTRY is not and has not ever been a "United States real property holding
corporation"  within the meaning of Section  897(c)(2) of the Code.  None of the
holders  of SENTRY  Common is a  "foreign  person"  as that term is  defined  in
Section  1445 of the  Code.  SENTRY  is not and has not  ever  been a party to a
tax-sharing  agreement and has not assumed the liability of any other person for
Taxes under contract.  SENTRY has never been a member of a group of corporations
filing a  consolidated,  unitary or  combined  Return.  SENTRY has not taken any
action that would have the effect of deferring any material  liability for Taxes
for SENTRY from any taxable period ending at or before the Effective Time to any
taxable period thereafter. SENTRY has not participated in or cooperated with any
international  boycott  within the meaning of Section 999 of the Code. As of the
Closing  Date the  ability of SENTRY to use its net  operating  losses and other
carryovers  will not have been  affected by Sections 382, 383 or 384 of the Code
(other  than as a  result  of the  Merger).  No claim  by a tax  authority  in a
jurisdiction  where SENTRY does not file returns that it is or may be subject to
Tax in that  jurisdiction  is  currently  outstanding.  No claim  has ever  been
sustained  by a tax  authority  in a  jurisdiction  where  SENTRY  does not file
Returns  that  it is or  may  be  subject  to  Tax  in  that  jurisdiction.  The
transactions  set forth in this Agreement are not subject to the Tax withholding
provisions  of Section 3406 of the Code,  or of Subchapter A of Chapter 3 of the
Code or of any  other  provision  of law.  SENTRY  is not a party  to any  joint
venture, partnership, or other arrangement or contract which could be treated as
a partnership for federal income tax purposes.  SENTRY does not have and has not
had a  permanent  establishment  in  any  foreign  country,  as  defined  in any
applicable  Tax treaty or convention  between the United States and such foreign
country. SENTRY has never filed a consent pursuant to Section 341(f) of the Code
(or any  corresponding  provision of state,  local or foreign law),  relating to
collapsible  corporations,  or agreed to have Section  341(f)(2) of the Code (or
any  corresponding  provision  of  state,  local or  foreign  law)  apply to the
disposition  of any asset owned by it. SENTRY shall have fully complied with all
federal,  state,  local and foreign Tax withholding  Tax obligations  arising in
connection  with the  cancellation  or  exercise of SENTRY  options,  rights and
warrants,  and META shall have no liability  therefor.  Any  adjustment of Taxes
made by the Internal Revenue Service in any examination  which is required to be
reported  to state,  local,  foreign  or other  taxing  authorities  has been so
reported,  and any additional  Taxes due with respect thereto have been paid. No
power of attorney  has been granted by SENTRY,  and is currently in force,  with
respect to any matter relating to Taxes.

      3.17 Employees.  (a) Schedule  3.17(a) sets forth a true and complete list
of (i) the names,  titles,  annual  salaries and other  compensation or benefits
(including,  but not  limited  to,  any  vacation,  holiday  or sick pay) of all
employees  of SENTRY (the  "Employees")  and all  consultants  of SENTRY and the
location at which such Employees and consultants  regularly perform services for
SENTRY  and (ii)  the wage  rates  for  non-salaried  Employees  of  SENTRY  (by
classification) and consultants. Any oral or written agreements,  commitments or
understandings between SENTRY and any Employee concerning such Employee's future
salary,  compensation or terms of employment are described in Schedule  3.17(a).
<PAGE> 23

Except as set forth on Schedule 3.17(a), none of such Employees has indicated to
SENTRY  that  he or  she  intends  to  resign  or  retire  as a  result  of  the
transactions contemplated by this Agreement or otherwise.

            (b) SENTRY is in compliance  in all material  respects with all U.S.
federal,  state,  and local  laws,  as  applicable,  respecting  employment  and
employment   practices,   employee  benefit  plans,   terms  and  conditions  of
employment,  wages and hours, and is not engaged in any unfair labor or unlawful
employment practice.  There is no unlawful employment practice or discrimination
charge  involving  SENTRY  pending  before  the  Equal  Employment   Opportunity
Commission ("EEOC"), EEOC recognized state "referral agency," any state or local
administrative  agency,  or  any  other  governmental  authority.  None  of  the
Employees of SENTRY are  represented by any labor union.  There are no grievance
or  arbitration  proceedings  relating to the Employees of SENTRY pending and no
written claim therefore exists with respect to SENTRY.

            (c) Each of the  persons  listed  on  Schedule  3.17(c)  is a former
employee of SENTRY whose  employment with SENTRY has been terminated and who has
executed a severance and release agreement which has previously been provided to
META.  No such former  employee  has filed or made,  or, to SENTRY's  knowledge,
threatened  to file or make,  any action,  complaint,  dispute or claim,  with a
court, governmental entity or agency, or otherwise, with respect to, concerning,
arising  out  of,  or  relating  to,  his or her  employment  (or  severance  or
termination of employment)  with SENTRY,  nor does any such former employee have
any present or future claims or causes of action under any  applicable  federal,
state,  local law, rule or regulation or any contract or any common laws against
SENTRY.  No such  former  employee  has a  right,  claim or  entitlement  to any
compensation for any services rendered to SENTRY. No such former employee,  when
he or she was employed by SENTRY, was in violation of any term of any employment
contract, nondisclosure or noncompetition or nonsolicitation agreement, or other
similar agreement with SENTRY or any person.

            (d) "Key Employees" are denoted on Schedule 3.17(d).

      3.18 Transactions  with Affiliates.  Except as set forth in Schedule 3.18,
there are no loans, leases, royalty agreements or other continuing  transactions
between  SENTRY,  on the one  hand,  and any  affiliate  of  SENTRY,  any of the
stockholders  of SENTRY,  any person known to be an affiliate of any stockholder
of SENTRY, or any member of any such stockholder's family, on the other hand. To
the knowledge of SENTRY, none of the officers or directors of SENTRY (a) has any
material  direct or indirect  interest in any entity  which does  business  with
SENTRY; (b) has any direct or indirect interest in any property,  asset or right
which  is  used  by  SENTRY  in the  conduct  of its  business;  or (c)  has any
contractual  relationship with SENTRY other than such relationships  which occur
from being an officer, director or stockholder of SENTRY.

      3.19 Insurance Coverage. Schedule 3.19 sets forth an accurate and complete
list of all insurance policies and fidelity bonds covering the assets, business,
equipment, properties,  operations, employees, officers and directors of SENTRY.
There is no claim by SENTRY  pending  under any of such  policies or bonds as to
which coverage has been  questioned,  denied or disputed by the  underwriters of
such policies or bonds.  All premiums  payable under all such policies and bonds
have been paid or are  reflected in accounts  payable,  and SENTRY has otherwise
complied in all  material  respects  with the terms and  conditions  of all such
policies and bonds.  Such policies of insurance and bonds (or other policies and
bonds providing  substantially  similar insurance  coverage) have been in effect
since  January 1, 1997 and remain in full force and  effect.  In the  opinion of
SENTRY,  such  insurance is adequate to cover all reasonably  foreseeable  risks
associated  with the  business  of  SENTRY  and is in such  amounts,  with  such
<PAGE> 24

deductibles  and with such other terms as is prudent for a business such as that
of SENTRY.  SENTRY has no knowledge  of any  threatened  termination  of, or has
received  written  notice of, any premium  increase with respect to, any of such
policies or bonds.

     3.20 Compliance with Laws; No Defaults. (a) Except as disclosed in Schedule
3.20,  SENTRY  is not in  violation  of any  applicable  provisions  of any law,
statute, ordinance,  regulation,  judgment, order, injunction,  permit, license,
certificate or other  authorization,  or its governing  instruments,  except for
violations  that have not had and could not  reasonably  be  expected  to have a
Material Adverse Effect on SENTRY.

           (b) SENTRY is not in material  default under, and to its knowledge no
condition  exists that with notice or lapse of time or both would  constitute  a
material  default under,  any applicable law,  statute,  ordinance,  regulation,
judgment,   order,   injunction,   permit,   license,   certificate   or   other
authorization, or its governing instruments.

           (c) Except as set forth on  Schedule  3.20,  SENTRY is in  compliance
with  all  currently  applicable  laws  respecting   employment  and  employment
practices,  terms and conditions of employment  and wages and hours,  and is not
engaged in any unfair labor practice, failure to comply with which or engagement
in which, as the case may be, has had, or could  reasonably be expected to have,
a Material Adverse Effect on SENTRY. There is no unfair labor practice complaint
pending or, to the  knowledge of SENTRY,  threatened  against  SENTRY before the
National Labor Relations Board.

     3.21  Finder's  Fees.  Except as set forth on  Schedule  3.21,  there is no
investment banker,  broker,  finder or other intermediary that has been retained
by or is  authorized to act on behalf of SENTRY who might be entitled to any fee
or  commission  from  META,  the  Company,  SENTRY  or  any  other  person  upon
consummation of the transactions contemplated by this Agreement.

     3.22 Environmental Matters. (a) Except as disclosed on Schedule 3.22,

            (i)  no  notice,  notification,  demand,  request  for  information,
     citation,  summons,  complaint or order has been issued,  no complaint  has
     been filed, no penalty has been assessed and no  investigation or review is
     pending or, to SENTRY's knowledge, threatened by any governmental entity or
     other  person with  respect to any (A) alleged  violation  by SENTRY of any
     Environmental Law (as defined herein) or liability thereunder,  (B) alleged
     failure  by  SENTRY to have any  permit,  certificate,  license,  approval,
     registration  or  authorization  required  under any  Environmental  law in
     connection  with the conduct of its  business  or (C) Release of  Hazardous
     Substances;

           (ii)  no  polychlorinated   biphenyls,   radioactive  material,  urea
     formaldehyde,  lead, asbestos,  asbestos-containing material or underground
     storage  tank (active or  abandoned)  is or was present at any property now
     owned or leased by SENTRY or was present at any property owned or leased by
     SENTRY in the five years preceding the date of this Agreement at, or at any
     time before,  the time such property was sold or such lease was  terminated
     by SENTRY or the applicable of its subsidiaries; and

          (iii) there are no Environmental  Liabilities (as defined herein) that
     have had or may reasonably be expected to have a Material Adverse Effect on
     SENTRY.
<PAGE> 25

           (b)  There has been no  environmental  investigation,  study,  audit,
test, review or other analysis  conducted of which SENTRY has possession,  or to
the knowledge of SENTRY,  to which it has access,  in relation to the current or
prior business of SENTRY or any property or facility now or previously  owned or
leased by SENTRY  which has not been  delivered to META at least five days prior
to the date hereof.

           (c) SENTRY has not  transported  or arranged  for the  transportation
(directly or  indirectly)  of any Hazardous  Substance to any location  which is
listed or, to SENTRY's  knowledge,  proposed for listing under CERCLA, or on any
similar  state  list  or  which  is the  subject  of  Federal,  state  or  local
enforcement actions or, to SENTRY's knowledge,  other  investigations  which may
lead to claims for clean-up costs,  remedial work,  damages to natural resources
or for  personal  injury  claims,  including,  but not limited to,  claims under
CERCLA or analogous state environmental clean-up laws.

     3.23  Intercompany  Arrangements;  Conflicts.  (a)  Except  as set forth on
Schedule  3.23,  SENTRY  does  not  own  any  note,  bond,  debenture  or  other
indebtedness,  or is otherwise a creditor,  of any stockholder of SENTRY. Except
as  disclosed  in  Schedule  3.23,  since  June 30,  1998 there has not been any
payment by SENTRY to any  stockholder  of SENTRY  (except  for  compensation  to
employees of SENTRY in their  capacities as such),  charge by any stockholder of
SENTRY, or any other transaction between SENTRY and any stockholder of SENTRY.

           (b) Except as set forth on  Schedule  3.23,  none of the  officers or
directors  of SENTRY (i) has any  material  direct or  indirect  interest in any
entity which does business with SENTRY; (ii) has any direct or indirect interest
in any  property,  asset or right  which is used by SENTRY in the conduct of its
business; or (iii) has any contractual  relationship with SENTRY other than such
relationships  that arise from being an  officer,  director  or  stockholder  of
SENTRY.

     3.24  Employee  Plans. (a). SENTRY  has set  forth on  Schedule  3.24 all
employee  benefit  plans (as defined in Section 3(3) of the Employee  Retirement
Income Security Act of 1974, as amended  ("ERISA")) and all bonus, stock option,
stock  purchase,  incentive,  deferred  compensation,  supplemental  retirement,
severance,  insurance (including   any   self-insured   or   post-retirement
arrangements),  disability, vacation,  profit-sharing and other similar employee
benefit plans, arrangements, policies or agreements, and all unexpired severance
agreements,  written or  otherwise,  for the  benefit  of, or  relating  to, any
current or former  employee of SENTRY or any trade or  business  (whether or not
incorporated) which,  together with SENTRY would be treated as a single employer
under  Section  414 of the Code (an "ERISA  affiliate")  (together,  the "SENTRY
Employee Plans").

           (b) With  respect  to each  SENTRY  Employee  Plan,  SENTRY  has made
available to META, a true and correct copy of (i) the most recent  annual report
(Form 5500) filed with the Internal  Revenue Service  ("IRS"),  (ii) such SENTRY
Employee Plan,  (iii) each trust agreement and group annuity  contract,  if any,
relating to such SENTRY Employee Plan, (iv) the most recent  actuarial report or
valuation  relating to a SENTRY  Employee  Plan subject to Title IV of ERISA and
(v) an accurate summary plan description of such SENTRY Employee Plan.

           (c) With respect to the SENTRY  Employee Plans,  individually  and in
the  aggregate,  no event has occurred,  and to the  knowledge of SENTRY,  there
exists no  condition or set of  circumstances  in  connection  with which SENTRY
could be subject to any liability under ERISA,  the Code or any other applicable
law.
<PAGE> 26

           (d) Each SENTRY Employee Plan which is intended to be qualified under
Section 401(a) of the Code is so qualified and has been so qualified  during the
period  from its  adoption  to date,  and each trust  forming a part  thereof is
exempt from tax pursuant to Section 501(a) of the Code.  SENTRY has furnished to
META copies of the most recent Internal  Revenue Service  determination  letters
with respect to each such plan.

           (e) Each SENTRY  Employee Plan has been maintained in compliance with
its terms and with the requirements prescribed by any and all statutes,  orders,
rules and  regulations,  including but not limited to ERISA and the Code,  which
are applicable to such SENTRY Employee Plan.

           (f) Neither SENTRY nor any of its ERISA  affiliates  maintains or has
ever  maintained or  contributed  to any  "multiemployer  plan" (as that term is
defined in Section 3(37) of ERISA) or any plan subject to Title IV of ERISA.  No
"prohibited  transaction"  (as that term is defined  in Section  406 of ERISA or
Section 4975 of the Code) has occurred with respect to any SENTRY Employee Plan.
No tax under  Section  4980B or Section  4980D of the Code has been  incurred in
respect to any SENTRY  Employee  Plan that is a group health plan, as defined in
Section  5000(b)(1)  of the Code.  With  respect  to the  employees  and  former
employees  of  SENTRY  or any of its ERISA  affiliates,  there  are no  employee
post-retirement medical or health plans in effect, except as required by Section
4980B of the Code.

           (g) With respect to the SENTRY  Employee Plans,  individually  and in
the aggregate,  there are no funded benefit  obligations for which contributions
have not been  made or  properly  accrued  and  there  are no  unfunded  benefit
obligations which have not been accounted for by reserves, or otherwise properly
footnoted in accordance with generally accepted  accounting  principles,  on the
financial  statements of SENTRY, which obligations are reasonably likely to have
a Material Adverse Effect on SENTRY.

           (h) None of the SENTRY  Employee Plans listed on Schedule 3.24 covers
any  non-United  States  employee  or  former  employee  of  SENTRY or any ERISA
affiliate.

           (i) No  provision  of this  Section 3.24 shall create any third party
beneficiary  or other rights in any employee or former  employee  (including any
beneficiary or dependent  thereof) of SENTRY in respect of continued  employment
(or resumed  employment) with SENTRY and no provision of this Section 3.24 shall
create any such rights in any such Persons in respect of any  benefits  that may
be provided, directly or indirectly,  under any SENTRY Employee Plan or any plan
or arrangement  that may be established by META or any of its ERISA  affiliates.
No provision of this Agreement shall constitute a limitation on rights to amend,
modify or terminate after the Closing Date any SENTRY Employee Plan.

           (j) Except as set forth in  Schedule  3.24,  SENTRY is not a party to
any oral or written (i) union or collective bargaining agreement, (ii) agreement
with any officer or any other key employee of SENTRY,  the benefits of which are
contingent,  or the terms of which are enhanced or materially altered,  upon the
occurrence of a transaction  involving SENTRY of the nature contemplated by this
Agreement,  (iii)  agreement  with any officer of SENTRY  providing  any term of
employment or compensation  guarantee,  or (iv) agreement or plan, including any
stock option plan, stock appreciation right plan, restricted stock plan or stock
purchase plan, any of the benefits of which will be increased, or the vesting of
the  benefits  of which will be  accelerated,  by the  occurrence  of any of the
transactions  contemplated by this Agreement or the value of any of the benefits
of which will be calculated on the basis of any of the transactions contemplated
by this Agreement.
<PAGE> 27

     3.25 Other Information. This Agreement and the Schedules hereto, taken as a
whole with respect to SENTRY,  do not contain an untrue  statement of a material
fact or omit to state a material fact  necessary in order to make the statements
contained therein, in the light of the circumstances under which they were made,
not  misleading.   The  financial  projections  relating  to  SENTRY  previously
delivered to META constitute SENTRY's good faith estimate as of the date of this
Agreement of the  information  purported to be shown therein,  and SENTRY is not
aware of any fact or information  that would lead it to reasonably  believe that
such  projections  are  incorrect or misleading  in any material  respect.  META
recognizes that such projections are based on certain  assumptions and that such
assumptions may not prove to be correct and,  accordingly,  such projections may
not prove to be correct. 

     3.26.  Sale of Book.  SENTRY has furnished to META and the Company true and
complete  copies  of  the  Book  Closing  Documents.   The  representations  and
warranties of SENTRY set forth in Section 4 of the Book Purchase  Agreement were
true and correct when made.

     3.27 Closing  Balance Sheet.  As of the Closing Date,  the Closing  Balance
Sheet (as  defined  herein)  will have been  prepared  in  accordance  with past
practice and generally  accepted  accounting  principles applied on a consistent
basis and will fairly present the financial position of SENTRY as of the Closing
Date (subject to recurring year-end  adjustments,  which adjustments will not be
material in amount or effect).


                                  ARTICLE IV

            REPRESENTATIONS AND WARRANTIES OF META AND THE COMPANY

     META and the Company hereby  represent and warrant,  jointly and severally,
to SENTRY as follows:

     4.1  Corporate  Existence  and  Power.  Each of META and the  Company  is a
corporation duly  incorporated,  validly existing and in good standing under the
laws of the State of  Delaware,  in the case of META,  and under the laws of the
Commonwealth of Massachusetts, in the case of the Company, and has all corporate
power and authority  necessary to enable it to own,  lease or otherwise hold its
properties and assets and to carry on its business as now conducted and proposed
to be conducted.  Except as set forth on Schedule 4.1, META is duly qualified to
do  business  as  a  foreign  corporation  and  is  in  good  standing  in  each
jurisdiction  where the  character of the property  owned or leased by it or the
nature of its activities makes such  qualification  necessary,  except for those
jurisdictions  where the  failure to be so  qualified  would not have a material
adverse effect upon the financial  condition,  results of operations,  business,
properties, assets or operations of META and its subsidiaries,  taken as a whole
(a "Material Adverse Effect on META").

     4.2 Corporate  Authorization.  The execution,  delivery and  performance by
META  and the  Company  of this  Agreement,  the  Participation  Agreement,  the
Registration  Rights  Agreement and the Escrow Agreement and the consummation by
META and the  Company  of the  Merger  and the other  transactions  contemplated
hereby and thereby, are within the corporate power and authority of META and the
Company, respectively, and, have been duly authorized by all necessary corporate
action.  Each of the Agreement,  the Participation  Agreement,  the Registration
Rights Agreement and the Escrow Agreement has been duly and validly  authorized,
executed and delivered by META and the Company and constitutes a valid and
<PAGE> 28

binding  obligation  of META and the Company,  enforceable  against META and the
Company in accordance with its terms.

     4.3 Governmental Authorization.  The execution, delivery and performance by
META and the Company of this Agreement,  and the  consummation of the Merger and
other  transactions  contemplated by this Agreement by META and the Company,  do
not and will not require any consent, approval or action by or in respect of, or
any declaration,  filing or registration with, any Governmental Authority, other
than routine filings with the Secretary of the  Commonwealth of the Commonwealth
of Massachusetts and any required  districts thereof necessary to consummate the
Merger, and compliance with the applicable requirements of the Securities Act of
1933, as amended (the "Securities Act"), the Securities Exchange Act of 1934, as
amended (the "Exchange  Act") and any applicable  state  securities and blue sky
laws in connection  with the  offering,  sale and delivery of the shares of META
Common and Warrants to be issued in the Merger.

     4.4 Non-Contravention.  The execution, delivery and performance by META and
the Company of this Agreement,  and the consummation of the Merger and the other
transactions  contemplated by this Agreement by META and the Company, do not and
will not, with or without the giving of notice,  the lapse of time or both:  (i)
contravene or conflict with the certificate of  incorporation or by-laws of META
or the  articles of  organization  or by-laws of the Company,  or (ii)  assuming
compliance with the matters  referred to in Section 4.3,  contravene or conflict
with or  constitute a violation of any provision of any law,  rule,  regulation,
judgment,  injunction, order or decree binding upon or applicable to META or the
Company.

     4.5 Capitalization. (a) As of August 31, 1998, the authorized capital stock
of META consisted of (i) 2,000,000 shares of Preferred Stock, par value $.01 per
share,  none of which were  issued and  outstanding  or held in the  treasury of
META, and (ii)  45,000,000  shares of Common Stock, of which  11,357,587  shares
were issued and outstanding and no shares were held in the treasury of META.

           (b) The  authorized  capital  stock of the Company  consists of 3,000
shares of Common  Stock,  par value $.01 per share,  100 of which are issued and
outstanding  and owned of record by META. All issued and  outstanding  shares of
META  Common and Common  Stock,  par value $.01 per share,  of the  Company  are
validly  issued,  fully  paid and  nonassessable,  and have not been  issued  in
violation of any preemptive,  first refusal or other subscription  rights of any
stockholder of META, the Company or any other person.

     4.6 META  Common.  The  shares  of META  Common  to be  issued  as  Initial
Consideration  and  exchanged for shares of SENTRY Common in the Merger will, at
the  Effective  Time,  be  duly  authorized,  validly  issued,  fully  paid  and
nonassessable  and subject to no  preemptive  rights other than  pursuant to the
terms hereof and the shares of META Common to be issued,  if any, as  Contingent
Consideration, if any, will, on the Contingent Closing Date, be duly authorized,
validly issued, fully paid and nonassessable and subject to no preemptive rights
other than as set forth in this Agreement.

      4.7 META SEC  Documents.  META has  made  available  to  SENTRY a true and
complete copy of the  following  META  documents:  (i) its annual report on Form
10-K for the fiscal year ended December 31, 1997; (ii) its quarterly  reports on
Form 10-Q for the fiscal quarters ended March 31, 1998 and June 30, 1998;  (iii)
its current report on Form 8-K dated April 27, 1998, filed on June 12, 1998; and
(iv) its proxy statement on Schedule 14A dated April 13, 1998 (collectively, the
"META SEC Documents"), each as filed with the Securities and Exchange Commission
(the  "Commission").  As of their  respective  dates,  the  META  SEC  Documents
<PAGE> 29

complied in all material respects with the requirements of the Exchange Act, and
the rules and  regulation of the Commission  thereunder  applicable to such META
SEC Documents.

     4.8 Absence of Certain  Changes.  Since June 30, 1998, the business of META
has been  conducted in the ordinary  course  consistent  with past practices and
there has not been any event, occurrence,  development or state of circumstances
or facts  which has had or could  reasonably  be expected to result in or have a
material  adverse  effect on the  financial  condition,  results of  operations,
business, properties, assets or operations of META.

     4.9 Litigation. Except as disclosed in any of the META SEC Documents or any
other  document  filed  with  the   Commission,   there  is  no  action,   suit,
investigation  or  proceeding  pending  against  or, to the  knowledge  of META,
threatened against or affecting,  META or any of its properties or assets before
any court,  arbitrator  or  Governmental  Authority.  META is not subject to any
judgment,  order or decree entered in any lawsuit or proceeding or issued by any
court, arbitrator or Governmental Authority.

     4.10 Finder's Fees. There is no investment banker,  broker, finder or other
intermediary that has been retained by or is authorized to act on behalf of META
who might be entitled to any fee or commission from SENTRY,  META or the Company
or any other person upon  consummation of the transactions  contemplated by this
Agreement.

                                  ARTICLE V

                                  COVENANTS

     5.1 Mutual  Covenants and Agreements.  Each of the parties hereby covenants
and agrees with the other parties as follows:

           (a)  Cooperation.  It shall  cooperate  fully with the other  parties
hereto in  furnishing  any  information  or  performing  any  action  reasonably
requested  by any such party,  which  information  or action is necessary to the
successful consummation of the transactions contemplated by this Agreement or is
necessary,  appropriate or desirable for the corporate purposes of META. Subject
to its  further  rights  under  this  Agreement,  it shall use all  commercially
reasonable  efforts to cause the  Closing to occur at the  earliest  practicable
time.

           (b) Other Required Information. It shall furnish to the other parties
hereto any application or statement,  and all information  concerning itself and
its  subsidiaries,  if  applicable,  as is  required  to be  set  forth  in  any
application  or  statement,  to be filed  with  any  Governmental  Authority  in
connection with the transactions contemplated by this Agreement, or otherwise.

           (c) Confidentiality. SENTRY and META have agreed in a confidentiality
agreement  dated January 30, 1998 (the  "Confidentiality  Agreement")  to, among
other  things,  protect the  confidential  information  of the other party.  The
Company  and META  each  hereby  affirm  each of their  obligations  under  such
agreement.  If this  Agreement  is  terminated  in  accordance  with Section 8.1
hereof, META shall, and shall cause its agents,  accountants,  advisors, counsel
and other representatives to deliver to SENTRY all documents and other material,
and all  copies  thereof,  obtained  by META or on its  behalf  from  SENTRY  in
connection  with  this  Agreement,  whether  so  obtained  before  or after  the
execution hereof, and will not disclose any such information or documents to any
third parties or make any use of any confidential information contained therein.
<PAGE> 30

If this  Agreement is terminated in accordance  with Section 8.1 hereof,  SENTRY
shall,  and shall cause its  agents,  accountants,  advisors,  counsel and other
representatives  to,  deliver to META (or  destroy  in  accordance  with  META's
instructions) all documents and other material, and all copies thereof, obtained
by SENTRY or on its behalf or by a stockholder of SENTRY from META in connection
with this Agreement,  whether so obtained before or after the execution  hereof,
and will not disclose any such  information or documents to any third parties or
make any use of any confidential information contained therein.

           (d) Publicity.  Except as otherwise  required by applicable law or by
any  applicable  rules of any  securities  exchange or market,  SENTRY shall not
issue any press release or make any other public statement without obtaining the
prior approval of META.

           (e) Miscellaneous  Agreements and Consents.  Subject to the terms and
conditions  provided in this Agreement,  it shall use all reasonable  efforts to
take,  or cause to be taken,  all  action,  and to do, or cause to be done,  all
things necessary, appropriate or desirable under applicable laws and regulations
to consummate the transactions contemplated by this Agreement. It will, and will
cause each of its subsidiaries to, use their  respective  reasonable  efforts to
obtain  consents of all third parties and  Governmental  Authorities  necessary,
appropriate or desirable for the consummation of the  transactions  contemplated
by this Agreement.

           (f) SENTRY Stock Options. (i) At the Effective Time, each outstanding
option to purchase  shares of SENTRY  Common under the SENTRY Stock Option Plans
(as defined herein) (each a "SENTRY Option" and  collectively,  the "Outstanding
Options"),  whether or not  exercisable,  will be assumed by META.  Each  SENTRY
Option so assumed by META under this  Agreement  will  continue to have,  and be
subject to, the same terms and  conditions  set forth in the  applicable  SENTRY
Stock Option Plan immediately  prior to the Effective Time, except that (A) each
SENTRY Option will be exercisable (or will become exercisable in accordance with
its terms) for that number of whole  shares of META Common  equal to the product
of the number of shares of SENTRY  Common that were  issuable  upon  exercise of
such SENTRY Option  immediately  prior to the Effective  Time  multiplied by the
Options  Exchange Ratio (as defined  herein),  rounded down to the nearest whole
number of shares of META Common,  and (B) the per share  exercise  price for the
shares of META Common  issuable upon exercise of such assumed SENTRY Option will
be equal to the quotient  determined by dividing the exercise price per share of
SENTRY Common at which such SENTRY Option was exercisable  immediately  prior to
the  Effective  Time by the Options  Exchange  Ratio,  rounded up to the nearest
whole cent;

     (ii) It is the  intention  of the  parties  that  the  Outstanding  Options
assumed by META qualify  following the Effective Time as incentive stock options
as defined in Section  422 of the Code to the extent  such  Outstanding  Options
qualified as incentive  stock  options  immediately  prior the  Effective  Time;
however the parties acknowledge that there can be no assurance that such options
will continue following the Effective Time to so qualify;

     (iii) META shall (A) reserve out of its authorized  but unissued  shares of
Common Stock  sufficient  shares to provide for the exercise of the  Outstanding
Options and (B) use all  commercially  reasonable  efforts to register under the
Securities  Act, as promptly as  practicable  after the  Effective  Time,  those
shares of META Common to be issued upon the exercise of the Outstanding  Options
for a period ending on the first date on which all Outstanding Options have been
exercised,  which registration shall initially be effective under a registration
statement  on  Form  S-8 or  such  other  form  as may be  permitted  under  the
Securities Act; and
<PAGE> 31

     (iv) Options (the "Non-Plan Options") to purchase SENTRY Common not granted
pursuant  to a  SENTRY  Stock  Option  Plan  shall  be  terminated  prior to the
Effective Time pursuant to Section 5.2(k).

            (g) Resale Registration  Statement.  Not later than thirty (30) days
after the Effective Time, META shall file a registration  statement (the "Resale
Registration  Statement")  on Form S-3  registering  the  shares of META  Common
issued to the  stockholders  of SENTRY who are  signatories to the  Registration
Rights  Agreement (and their  permitted  transferees)  as Initial  Consideration
(other than the Escrow Shares) pursuant to Section  2.3(a)(1) upon  consummation
of the Merger under the Securities Act and shall use all commercially reasonable
efforts to cause the Resale  Registration  Statement to become  effective and to
remain effective until the first  anniversary of the Effective Time, all as more
fully described in the Registration Rights Agreement.

     5.2 Certain  Covenants of SENTRY.  SENTRY hereby  covenants and agrees with
META and the Company as follows:

           (a) Preservation of Business Organization.  SENTRY shall use its best
efforts to preserve  without  material  impairment the business  organization of
SENTRY  and its  goodwill  as to  payors,  providers,  suppliers,  distributors,
clients and others having  business  relations with SENTRY and to keep available
the services of its present  officers and  employees and shall  promptly  advise
META with respect to any  inability  or potential  inability to preserve or keep
available the foregoing.

           (b) Carry on in Regular Course. SENTRY shall carry on its business in
the ordinary course in a manner consistent with its past practices.

           (c) Consents. SENTRY shall use its best efforts to obtain consents in
writing  to  the  transactions   contemplated  by  this  Agreement  and/or  such
amendments, assignments or modifications of such documents or instruments as may
be required in order that the transactions  contemplated by this Agreement shall
not result in any default  with  respect to any law,  rule,  regulation,  order,
decree, license, agreement,  contract,  commitment or instrument to which SENTRY
is a party or by which SENTRY, or any of its assets, is bound.

           (d) Capital Stock.  Without the prior written  consent or approval of
META,  SENTRY  shall not  redeem,  purchase  or  otherwise  acquire,  any SENTRY
Securities,  or agree to do any of the foregoing.  SENTRY shall not  accelerate,
amend or change the period of  exercisability  of  options or  restricted  stock
granted under  employee  stock plans or authorize  cash payments in exchange for
any options  granted under any of such plans.  Without the prior written consent
or approval of META, SENTRY shall not issue, deliver, sell or grant or authorize
or propose the issuance,  delivery, sale or grant of, or purchase or propose the
purchase of, any shares of its capital stock or securities  convertible into, or
subscriptions,  rights,  warrants or options to acquire,  or other agreements or
commitments  of any  character  obligating  it to issue any such shares or other
convertible  securities,  other than the  issuance by SENTRY of shares of SENTRY
Common pursuant to the exercise of stock options therefor  outstanding as of the
date of this Agreement.

           (e) Other Actions.  Without the prior written  consent or approval of
META or as otherwise required by this Agreement,  SENTRY shall not (i) amend its
articles of organization or by-laws; (ii) declare, set aside or pay any dividend
or otherwise make a distribution  with respect to any shares of capital stock of
SENTRY;  (iii) amend any material  term of any  outstanding  security of SENTRY;
(iv) incur,  assume or guarantee any  indebtedness for borrowed money other than
<PAGE> 32

in the ordinary  course of business and in amounts and on terms  consistent with
past  practices,  but in any event not  exceeding an  aggregate of $10,000;  (v)
create or assume  any Lien on any  asset,  other  than  Liens that do not in the
aggregate  materially detract from the value of such assets or materially impair
the use thereof in the operation of the business of SENTRY;  (vi) make any loan,
advance or  capital  contributions  to or  investment  in any person  other than
loans,  advances or capital  contributions  to or  investments  in wholly  owned
subsidiaries  made in the  ordinary  course  of  business  consistent  with past
practices;  (vii)  acquire  any  capital  assets  or any other  investments  for
aggregate  consideration  in excess  of  $10,000;  (viii)  sell  lease,  pledge,
transfer or dispose of any capital assets for aggregate  consideration in excess
of  $10,000;  (ix)  enter into any  transaction  or make any  commitment  or any
contract  or  agreement  relating  to its  assets  or  business  (including  the
acquisition  or  disposition  of any assets) or relinquish any contract or other
right, in either case, material to SENTRY, other than transactions,  commitments
and  relinquishments  in the ordinary  course of business  consistent  with past
practices  and those  contemplated  by this  Agreement;  (x)  other  than in the
ordinary  course of  business,  make or change any election in respect of Taxes,
adopt or change any method of accounting  or  accounting  practice in respect of
Taxes, enter into any closing  agreement,  settle any claim in respect of Taxes,
or consent to any extension or waiver of the limitation period applicable to any
claim or assessment in respect of Taxes; (xi) grant any severance or termination
pay to any director,  officer or employee of SENTRY,  enter into any employment,
severance,  management,  consulting,  deferred  compensation  or  other  similar
agreement (or any amendment to any such existing  agreement)  with any director,
officer or  employee  of SENTRY,  change the  benefits  payable  under  existing
severance or  termination  pay policies or  employment,  severance,  management,
consulting or other  similar  agreements  or change the  compensation,  bonus or
other benefits payable to directors, officers or employees of SENTRY, other than
increases  in  the  ordinary  course  of  business  of the  compensation  of the
employees  of  SENTRY;  (xii)  enter  into  any  transaction  with  any of their
respective  stockholders,  other than in the ordinary course of, and pursuant to
the  reasonable  requirements  of,  business  and  upon  terms  that are no less
favorable to SENTRY than SENTRY could obtain in a comparable  transaction with a
person  who was not such a  stockholder  or other than as  contemplated  by this
Agreement; or (xiii) agree to do any of the foregoing.

           (f)  Access.  SENTRY  shall,  permit  officers,   employees,  agents,
attorneys and accountants and other persons designated by META full access after
reasonable notice during normal business hours to the properties,  books,  audit
work papers, contracts, commitments, Returns, examinations and all other reports
of the Internal  Revenue Service and any state,  local,  foreign or other taxing
authority  and other  records of SENTRY.  Unless  prohibited by law or contract,
such  designees  of META shall be  furnished  with true,  accurate  and complete
copies  of  such  contracts,   commitments  and  other  records  and  all  other
information  with respect to the assets and business of SENTRY as such designees
may reasonably request.

           (g) Documents and  Information to be Furnished.  SENTRY shall deliver
to META promptly after such documents are available  SENTRY's  unaudited monthly
financial  reports with respect to periods  ending after the date hereof and all
other documents, financial statements, budgets, proxy or information statements,
reports, correspondence, notices and other items SENTRY delivers, or is required
to deliver, to any of its stockholders.

           (h) Stockholder  Meeting.  SENTRY shall take all action  necessary in
accordance  with  applicable law to convene a meeting of its  stockholders to be
held no later  than  October  21,  1998  (the  "Meeting"),  for the  purpose  of
approving this Agreement.  On or before  September 30, 1998 SENTRY shall mail to
each  stockholder  who was a  stockholder  on the  record  date for  determining
stockholders  entitled to notice of the Meeting, (A) a notice of special meeting
(which notice may be included in the Information Statement (as defined herein)),
(B) an  information  statement  and  letter  of  transmittal  (the  "Information
Statement") with respect to the matters to be submitted for stockholder approval
<PAGE> 33

at the Meeting;  and (C) a notice that  appraisal  rights are  available for the
shares of SENTRY Common held by each such stockholder of SENTRY, together with a
statement  of rights of  objecting  stockholders,  in  satisfaction  of SENTRY's
obligations  under  Section 87 of the  Massachusetts  BCL.  Within ten (10) days
after  the  Effective  Time,  the  Surviving   Corporation   shall  notify  each
stockholder who filed written  objection  meeting the requirements of Section 86
of the  Massachusetts  BCL and  whose  shares  were  not  voted in favor of this
Agreement that the Merger has become effective under the  Massachusetts  BCL, in
satisfaction of the Surviving  Corporation's  obligation under Section 88 of the
Massachusetts  BCL. Such notices shall be sent by certified or registered  mail,
return receipt  requested,  addressed to such stockholders at their addresses as
they  appear on the  records of the  Surviving  Corporation.  In  addition,  the
Information  Statement shall include or be accompanied by such other information
provided by META as META deems  necessary  in order to provide for the offer and
sale of the META Common and the Warrants to be issued in the Merger to be exempt
from any applicable  registration  or  qualification  requirements  under either
federal  or state  securities  or "Blue  Sky"  laws.  SENTRY  shall use its best
efforts to obtain all votes and approvals of its stockholders  necessary for the
approval  of this  Agreement  under the  Massachusetts  BCL and its  articles of
organization and by-laws.

            (i) Notices of Certain Events. SENTRY shall promptly notify META of:

            (i) any notice or other  communication from any person alleging that
     the consent of such person is or may be  required  in  connection  with the
     transactions contemplated by this Agreement;

           (ii) any  notice  or  other   communication  from  any  Governmental
     Authority  in  connection  with  the  transactions   contemplated  by  this
     Agreement;

          (iii) any actions,  suits,  claims, investigations  or  proceedings
     commenced  relating to or involving or otherwise  affecting SENTRY that, if
     pending on the date of this  Agreement,  would have been  required  to have
     been disclosed  pursuant to Article III or that relate to the  consummation
     of the transactions contemplated by this Agreement; and

           (iv) any  matter  arising  and  discovered  after  the  date of this
     Agreement that, if existing or known on the date of this  Agreement,  would
     have been  required  to be  disclosed  pursuant  to this  Agreement  or the
     Participation Agreement, or that constitutes a breach or prospective breach
     of this  Agreement  or the  Participation  Agreement  by SENTRY,  the Major
     Stockholders or any of their affiliates.

           (j)  Accuracy of Representations and Warranties.  SENTRY shall not
     (i)take  or  agree  or  commit  to take  any  action  that  would  make any
representation and warranty of SENTRY hereunder inaccurate in any respect at, or
as of any time  prior to,  the  Closing  Date or (ii) omit or agree or commit to
omit to take any action necessary to prevent any such representation or warranty
from being inaccurate in any respect at any such time.

           (k)  Termination of Agreements.  SENTRY shall  terminate (and pay any
sums due  thereunder),  effective  immediately  prior to the Effective Time, all
agreements listed at the end of this sentence and all agreements, whether listed
or  not,  among  SENTRY  and  any of its  securityholders  or  optionholders  or
employees,  or among any SENTRY securityholders or optionholders,  providing for
registration rights, rights of first refusal or co-sale,  relating to the voting
of SENTRY  securities  or requiring  SENTRY to obtain the consent or approval of
any such securityholders prior to taking or failing to take any action:
<PAGE> 34

                 (1) Employment Agreement dated November 13, 1998 by and between
SENTRY Technology Group, Inc. and Robert H. Cawly except for Sections 7, 8 and 9
thereof;

                 (2) Employment Agreement dated November 13, 1996 by and
between SENTRY Technology Group, Inc. and William A. Gannon, Sr. except for
Sections 7, 8 and 9 thereof;

                 (3) Voting, Stock Restriction and Co-Sale Agreement among
Safeguard Scientifics (Delaware), Inc. ("Safeguard"), SENTRY Technology
Group, Inc., William A. Gannon, Sr., William A. Gannon, Jr., Robert H. Cawly,
Carl Sempier and Kirk K. Reiss dated November 12, 1996, as amended by
Amendment No. 1 dated as of August 6, 1997;

                 (4) the Shareholder Agreements and the Subscription  Agreements
(as defined in Schedule 3.15);

                 (5)  the   Safeguard-Cawly-Reiss   Agreements  (as  defined  in
Schedule 3.15);

                 (6) the Safeguard Agreements (as defined in Schedule 3.5);
and

                 (7) Options to purchase  SENTRY Common  referenced in subclause
(i) of clause (iii) of Schedule 3.13.

            (l)  Warrants.  SENTRY  shall  either  cause  the  exercise  of,  or
terminate all of the SENTRY  Warrants (as defined  herein) prior to the Closing,
with all rights to  purchase  SENTRY  Common  under the SENTRY  Warrants  or any
registration  rights  relating  to the  shares of SENTRY  Common  issuable  upon
exercise of the SENTRY Warrants relinquished in a manner satisfactory to META.

           (m) No Solicitation.  From and after the date of this Agreement until
the earlier of the Effective Time or  termination of this Agreement  pursuant to
its  terms,  SENTRY  shall  not,  and will  instruct  its  directors,  officers,
employees,  representatives,  investment bankers,  agents and affiliates not to,
directly  or  indirectly,   initiate,   solicit,  encourage  or  participate  in
discussions  with,  provide  information to, or approve a transaction  with, any
corporation, partnership, person or other entity or group concerning any merger,
purchase  or sale of  substantial  assets,  sale of shares of capital  stock (or
securities convertible or exchangeable or otherwise evidencing, or any agreement
or  instrument  evidencing,  the right to  acquire  capital  stock)  or  similar
transaction  involving SENTRY (all such transactions being referred to herein as
"Acquisition  Proposals").  If any,  SENTRY will  immediately  cease any and all
existing  activities,  discussions or  negotiations  with any parties  conducted
heretofore with respect to any of the foregoing.  SENTRY will (i) notify META as
promptly as practicable if any inquiry or proposal is made or any information or
access is requested in writing in  connection  with an  Acquisition  Proposal or
potential  Acquisition  Proposal and (ii) as promptly as practicable notify META
of the significant  terms and conditions of any such  Acquisition  Proposal.  In
addition, subject to the other provisions of this Section 5.2(m), from and after
the  date  of this  Agreement  until  the  earlier  of the  Effective  Time  and
termination of this Agreement  pursuant to its terms,  SENTRY will not, and will
instruct  its  directors,  officers,  employees,   representatives,   investment
bankers, agents and affiliates not to, directly or indirectly, make or authorize
any  public  statement,   recommendation  or  solicitation  in  support  of  any
Acquisition Proposal made by any person, entity or group (other than META).
<PAGE> 35

           (n)   Continuing   Disclosure.   SENTRY  shall  have  the  continuing
obligation  promptly to advise META with respect to any matter hereafter arising
or discovered  that, if existing or known at the date of this  Agreement,  would
have been required to be set forth or described in a schedule to this Agreement,
or that constitutes a breach or prospective  breach of this Agreement by SENTRY.
The  delivery  of any such  notice  shall not  affect  META's  or the  Company's
remedies hereunder.

     5.3 Covenants of META and the Company. META and the Company hereby covenant
and agree with SENTRY as follows:

           (a)  Preservation  of  Business  Organization.  META  shall  use  all
commercially reasonable efforts to cause to preserve without material impairment
the business  organization of META and its subsidiaries and their goodwill as to
payors, providers, suppliers,  distributors,  clients and others having business
relations with META and its subsidiaries.

           (b) Carry on in Regular Course.  META shall, carry on its business in
the ordinary and usual course,  in a manner  consistent with its past practices.
Without the prior  written  consent or approval of SENTRY,  META shall not amend
its certificate of incorporation or by-laws.

           (c) Consents.  META shall use all commercially  reasonable efforts to
obtain  consents in writing to the  transactions  contemplated by this Agreement
and/or such  amendments,  assignments  or  modifications  of such  documents  or
instruments as may be required in order that the  transactions  contemplated  by
this  Agreement  shall not result in any default with respect to any law,  rule,
regulation,   order,  decree,  license,  agreement,   contract,   commitment  or
instrument  to which  META is a party or by which  META or any of its  assets is
bound.

           (d) Documents and Information to be Furnished.  META shall furnish to
SENTRY,  promptly  after  filed with the  Commission,  its  unaudited  quarterly
financial  reports in the form filed with the Commission on Form 10-Q prescribed
under the Exchange Act and such other reports,  statements,  documents and other
items META delivers, or is required to deliver, to any of its stockholders.

           (e) Notices of Certain Events. META shall promptly notify SENTRY of:

            (i) any notice or other  communication from any person alleging that
     the consent of such person is or may be  required  in  connection  with the
     transactions contemplated by this Agreement;

           (ii)  any  notice  or  other   communication  from  any  Governmental
     Authority  in  connection  with  the  transactions   contemplated  by  this
     Agreement; and

          (iii)  any  actions,  suits,  claims,  investigations  or  proceedings
     commenced  relating to or involving or otherwise  affecting  META or any of
     its subsidiaries that, if pending on the date of this Agreement, would have
     been required to have been disclosed  pursuant to Article IV or that relate
     to the consummation of the transactions contemplated by this Agreement.
<PAGE> 36

                                  ARTICLE VI

                               CLOSING MATTERS

     6.1 The Closing.  Subject to the  satisfaction  or waiver of all conditions
precedent  set forth in Article VII,  the closing of the Merger (the  "Closing")
shall be held at the offices of Testa,  Hurwitz &  Thibeault,  LLP,  High Street
Tower, 125 High Street,  Boston,  Massachusetts  02110, at 11:00 a.m. on October
21, 1998 or as soon as thereafter as practicable  (the "Closing  Date").  If any
condition in Article VII is not  satisfied  in any  material  respect (or is not
duly waived) at the  Closing,  any party whose  obligations  are subject to such
condition may extend the period in which the Closing must be consummated (during
which period each other party shall use its respective  commercially  reasonable
efforts to cause all such conditions to be satisfied in all material  respects).
If all conditions  are  determined to be satisfied in all material  respects (or
are duly waived) at the Closing  (whether or not delayed),  the Closing shall be
consummated  by the making of all  necessary  filings with the  Secretary of the
Commonwealth of the  Commonwealth of Massachusetts  (and any required  districts
thereof) under the Massachusetts BCL.

     6.2 Documents and Certificates.  Each of META, the Company and SENTRY shall
use their  respective best efforts,  on or prior to the Closing,  to execute and
deliver all such  instruments,  documents or certificates as may be necessary or
advisable,  on the advice of counsel, for the consummation at the Closing of the
transactions  contemplated  by this  Agreement or to cause the  Effective  Time,
subject to consummation at the Closing, to occur as soon as practicable.


                                 ARTICLE VII

                            CONDITIONS OF CLOSING

     7.1  Conditions  to  Obligations  of META,  the  Company  and  SENTRY.  The
obligations  of each of META,  the Company and SENTRY  under this  Agreement  to
cause  the  Merger  to be  consummated  are,  at  its  option,  subject  to  the
satisfaction of the following conditions:

           (a) Governmental  Approvals.  META, the Company and SENTRY shall have
received all necessary approvals of Governmental Authorities of the transactions
contemplated by this Agreement,  and each of such approvals shall remain in full
force  and  effect  at the  Closing  Date.  It is  understood  that none of such
approvals  shall be deemed to have been received if any such approval is subject
to  satisfaction  of or  compliance  with a  Burdensome  Condition.  "Burdensome
Condition"  shall mean the  imposition  of a material  restriction  on META's or
SENTRY's  ability to operate  SENTRY  following the Effective  Time or requiring
META or SENTRY to dispose  of a material  amount of the assets of SENTRY or META
or its  subsidiaries  following the Effective  Time. Any of META, the Company or
SENTRY  may,   but  is  not   obligated   to,  seek  the  removal  or  otherwise
satisfactorily resolve the Burdensome Condition.

           (b)  Litigation.   No  action,   suit,   litigation,   proceeding  or
investigation shall (i) have been formally instituted and be pending with regard
to the Merger or (ii) be threatened by any Governmental Authority with regard to
the Merger  which,  if resolved  substantially  in accordance  with  plaintiff's
demand, would be reasonably likely to have a Material Adverse Effect on META. On
the Closing Date, there shall not be in force any order or decree restraining or
enjoining  consummation  of the  Merger  or  placing  any  limitation  upon such
consummation or to invalidate,  suspend or require modification of any provision
of this Agreement.
<PAGE> 37

           (c)  Nasdaq  Listing.  The  shares of META  Common  to be issued  and
exchanged  for shares of SENTRY  Common in the  Merger as Initial  Consideration
pursuant to this  Agreement  will,  at the Effective  Time,  be  authorized  for
listing on the Nasdaq National Market.

     7.2 Conditions  Applicable to META and the Company. The obligations of META
and the Company under this Agreement to cause the Merger to be consummated  are,
at their option,  subject to the  satisfaction of the following  conditions,  in
addition to the conditions contained in Section 7.1:

           (a) Agreements and Covenants. SENTRY shall have performed or complied
in all material  respects with all  agreements  and  covenants  required by this
Agreement to be performed or complied  with by SENTRY on or prior to the Closing
Date.

           (b) Accuracy of Representations  and Warranties.  The representations
and  warranties  of SENTRY set forth in Article III shall be true and correct in
all material  respects both on the date of this  Agreement and as of the Closing
Date with the same force and effect as if such  representations  and  warranties
were made anew at and as of the  Closing  Date,  except:  (i) to the extent such
representations  and warranties are by their express  provisions  made as of the
date of this Agreement or another specified date; and (ii) for the effect of any
activities  or  transactions  which may have taken  place after the date of this
Agreement which are contemplated by this Agreement.

           (c) No Material  Adverse  Change.  Since the date of this  Agreement,
there shall have been no material  adverse  change in the  financial  condition,
results of operations, business, properties, assets or operations of SENTRY.

           (d) Officers'  Certificate  Concerning this  Agreement.  SENTRY shall
have  furnished to META and the Company a  certificate  dated the Closing  Date,
signed by its chief executive  officer and its chief financial  officer,  to the
effect that the conditions set forth in Sections 7.2(a) through 7.2(c) have been
satisfied.

           (e) Opinion of Counsel. META and the Company shall have received from
counsel  to  SENTRY  and  counsel  for  Safeguard  and the  participants  in the
Safeguard   Long-Term   Incentive   Plan  an  opinion  dated  the  Closing  Date
substantially   in  the  form  set  forth  in  Exhibit  H-1  and  Exhibit   H-2,
respectively.

           (f) Required  Consents.  The holders of any note,  guarantee or other
evidence of indebtedness of SENTRY, the lessors of any material real or personal
property  or assets  leased by SENTRY,  the parties  (other than  SENTRY) to any
other material contract, commitment or agreement to which SENTRY is a party, and
any  other  person  (other  than  Governmental  Authorities)  which  owns or has
authority to grant any franchise,  license,  permit,  easement,  rights or other
authorization  necessary for the business or operations of SENTRY, to the extent
that  their  consent  or  approval  of  the  Merger  or any  other  transactions
contemplated by this Agreement is required under the pertinent lease,  contract,
commitment  or agreement or other  document or  instrument  or under  applicable
laws, rules or regulations for the consummation of the transactions contemplated
hereby in the  manner  herein  provided,  shall  have  granted  such  consent or
approval and no Burdensome Condition shall exist.

           (g) Voting. Holders of not less than 70% of the outstanding shares of
SENTRY Common shall have voted for the approval of this Agreement.
<PAGE> 38

           (h) Performance of Participation  Agreement. All the terms, covenants
and conditions of the Participation  Agreement to be complied with and performed
by the Major  Stockholders  on or before the Closing  Date shall have been fully
complied with and performed in all material respects.

           (i)  Termination  of  Agreements.  All  agreements  listed in Section
5.2(k) and,  whether listed thereon or not, all agreements  among SENTRY and any
of its securityholders or optionholders or employees, or among any of the SENTRY
securityholders or optionholders,  providing for registration rights,  rights of
first refusal,  rights of co-sale, an adjustment to the number, or conversion or
exercise  price,  of any of the shares of capital stock of SENTRY (other than an
adjustment  as  a  result  of  a  subdivision,  combination,  reorganization  or
reclassification  of the shares of capital stock of SENTRY generally),  relating
to the voting of SENTRY  securities or requiring SENTRY to obtain the consent or
approval  of any such  securityholders  prior to taking or  failing  to take any
action,  including  without  limitation all of the Agreements  listed in Section
5.2(k),  shall have been  terminated  in their  entirety  as provided by Section
5.2(k).

           (j)  Warrants.  All  SENTRY  Warrants  shall be either  exercised  or
terminated prior to the Closing.

           (k)  Proceedings.  All proceedings to be taken in connection with the
transactions  contemplated by this Agreement and all documents  incident thereto
shall be reasonably  satisfactory  in form and substance to META, and META shall
have  received  copies  of all  such  documents  and  other  evidence  as it may
reasonably  request to establish the  consummation of such  transactions and the
taking of all proceedings in connection therewith.

           (l)  Purchaser  Representative.  SENTRY  shall  have  entered  into a
Purchaser  Representative  Agreement, in form and substance satisfactory to META
and SENTRY,  with a purchaser  representative  who shall certify thereunder that
(i) he is  familiar  with the  definition  and  qualifications  of a  "Purchaser
Representative"  as set forth in Rule 501(h) of Regulation D promulgated  by the
Commission under the Securities Act, (ii) he meets the conditions  applicable to
a  Purchaser  Representative  and  is  qualified  to  act in  such  capacity  in
connection  with the  transactions  contemplated  hereunder,  (iii) he is not an
affiliate,  director,  officer  or other  employee  of META and (iv) he has such
knowledge and experience in financial and business matters that he is capable of
evaluating the merits and risks of the transactions contemplated hereunder.

           (m) Tax Certificate.  SENTRY shall have delivered to META a clearance
certificate or similar document(s) which may be required by any tax authority to
relieve  META of any  obligation  to  withhold  Taxes  in  connection  with  the
transactions set forth in this Agreement. SENTRY shall have paid any sales, use,
transfer and  documentary  Taxes and recording and filing fees applicable to the
transactions set forth in this Agreement.  SENTRY shall have delivered to META a
properly executed statement  satisfying the requirements of Treasury  Regulation
Sections 1.897-2 and 1.1445 in a form reasonably acceptable to META.

           (n)  Intention to Exercise  Appraisal  Rights.  The date on which the
stockholders of SENTRY shall have voted on this Agreement pursuant to Section 78
of the  Massachusetts  BCL shall have  passed and holders of not more than 5% of
the outstanding shares of SENTRY Common shall have (i) not voted in favor of the
approval of such Agreement and (ii) filed with SENTRY a written objection to the
<PAGE> 39

approval  of this  Agreement  prior to such  vote,  which  objection  states  an
intention to demand  payment for shares if approval is given and  complies  with
Section 86 of the Massachusetts BCL.

           (o) Balance  Sheet.  On the  Closing  Date  immediately  prior to the
Effective Time, SENTRY's total assets (net of goodwill) shall be greater than or
equal to its total  liabilities,  as  certified  by a  certificate  of the Chief
Financial  Officer of  SENTRY,  which  certificate  shall be  accompanied  by an
unaudited  balance  sheet as of such date prepared by such officer in accordance
with past practice and generally  accepted  accounting  principles  applied on a
consistent basis (the "Closing Balance Sheet").

           (p) Employees. None of the persons set forth on Exhibit G shall have:
(i)  voluntarily  terminated  their  employment  with  SENTRY on or prior to the
Effective Time or (ii) refused to accept  employment  with, or given notice that
they do not intend to continue employment with, the Surviving Corporation.

           (q)  Consents,  etc. All  required  consents,  waivers or  amendments
pursuant to the Amended and Restated  Revolving  Credit and Term Loan  Agreement
dated as of May 15, 1997, as amended as of July 1, 1997,  September 11, 1997 and
May 28, 1998,  by and between The SENTRY  Group,  Inc. and State Street Bank and
Trust Company shall have been obtained.

     7.3 Conditions  Applicable to SENTRY.  The obligations of SENTRY under this
Agreement to cause the Merger to be consummated  are, at its option,  subject to
the  satisfaction  of the following  conditions,  in addition to the  conditions
contained in Section 7.1:

           (a)  Agreements  and  Covenants.  META  and the  Company  shall  have
performed or complied in all material respects with all agreements and covenants
required by this  Agreement  or the  Participation  Agreement to be performed or
complied with by them on or prior to the Closing Date.

           (b) Accuracy of Representations  and Warranties.  The representations
and  warranties  of META and the Company set forth in Article IV shall have been
true and correct in all material  respects on the date of this  Agreement and as
of the  Closing  Date with the same force and effect as if such  representations
and warranties were made anew at and as of the Closing Date,  except: (i) to the
extent such  representations and warranties are by their express provisions made
as of the date of this  Agreement or another  specified  date;  and (ii) for the
effect of any  activities or  transactions  which may have taken place after the
date of this Agreement which are contemplated by this Agreement.

           (c) Officers' Certificate Concerning This Agreement.  META shall have
furnished to SENTRY a certificate  dated the Closing  Date,  signed by the chief
financial  officer of META,  to the effect  that,  the  conditions  set forth in
Sections 7.3(a) through 7.3(b) hereof have been satisfied.

           (d) Opinion of Counsel.  SENTRY shall have  received  from counsel to
META an opinion or opinions dated the Closing Date substantially in the form set
forth on Exhibit I.

           (e)  Required  Consents.  META shall have  received  all  consents or
approvals of the Merger or any other transactions contemplated by this Agreement
required under any material lease, contract, commitment, note, guaranty or other
evidence of indebtedness of META or any of its subsidiaries, or any lease of any
material real property of META and its subsidiaries, or under applicable law for
the consummation of the transactions contemplated hereby.
<PAGE> 40

                                 ARTICLE VIII

                                 TERMINATION

      8.1 Termination. This Agreement may be terminated at any time prior to the
Effective Time of the Merger,  whether before or after approval of the Merger by
the stockholders of the Company and SENTRY:

            (a)   by mutual written consent duly authorized by the Boards of
Directors of META and SENTRY;

            (b) by either  SENTRY  or META,  if the  Merger  shall not have been
consummated by November 15, 1998; provided, however, that the right to terminate
this  Agreement  under this  Section  8.1(b) shall not be available to any party
whose action or failure to act has been a principal  cause of or resulted in the
failure of the Merger to occur on or before such date and such action or failure
to act constitutes a breach of this Agreement;

            (c) by either SENTRY or META,  if a court of competent  jurisdiction
or governmental,  regulatory or  administrative  agency or commission shall have
issued an order, decree or ruling or taken any other action (an "Order"), in any
case  having the  effect of  permanently  restraining,  enjoining  or  otherwise
prohibiting   the  Merger,   which   order,   decree  or  ruling  is  final  and
nonappealable;

            (d) by  either  SENTRY or META,  if the  required  approvals  of the
stockholders  of  SENTRY  contemplated  by this  Agreement  shall  not have been
obtained by November 15, 1998 or by reason of the failure to obtain the required
vote upon a vote taken at a meeting of stockholders duly convened therefor or at
any adjournment thereof;

            (e) by META, if SENTRY shall have accepted an  Acquisition  Proposal
or if the SENTRY Board of Directors  recommends an  Acquisition  Proposal to the
stockholders of SENTRY;

            (f) by  META,  if the  Board  of  Directors  of  SENTRY  shall  have
withheld, withdrawn or modified in a manner adverse to META its approval of this
Agreement;

            (g) (1) by META, if there shall have  occurred any material  adverse
change in the financial condition, results of operations,  business, properties,
assets or  operations  of  SENTRY  since  the date of this  Agreement,  it being
understood  that  conditions  affecting the  information  technology  consulting
industry as a whole or the U.S. economy as a whole shall not be deemed by itself
to constitute such a material adverse change or,

                  (2) by SENTRY,  if there  shall  have  occurred  any  material
adverse  change in the financial  condition,  results of  operations,  business,
properties,  assets or operations of META since the date of this  Agreement,  it
being  understood  that  none of the  following  shall be deemed by itself or by
themselves,  either  alone or in  combination,  to  constitute  such a  material
adverse  change:  (i) a change in the  market  price or  trading  volume of META
Common,  (ii) a  failure  by META to meet the  earnings  predictions  of  equity
analysts as reflected in the First Call consensus estimate, or any other revenue
or earnings  predictions  or  expectations,  for any period ending (or for which
<PAGE> 41

earnings are  released) on or after the date of this  Agreement and prior to the
Closing Date or, (iii) conditions affecting the information  technology services
and consulting industry as a whole or the U.S. economy as a whole.

            (h) by META, upon breach of any representation,  warranty,  covenant
or  agreement  on the part of  SENTRY  set  forth in this  Agreement,  or if any
representation  or warranty of SENTRY shall have become  untrue,  in either case
such that the conditions set forth in Section 7.2(a) or Section 7.2(b) would not
be satisfied as of the time of such breach or as of the time such representation
or warranty  shall have become  untrue,  provided,  that if such  inaccuracy  in
SENTRY's representations and warranties or breach by SENTRY is curable by SENTRY
through the exercise of its commercially reasonable efforts within five (5) days
of the time such  representation  or warranty  shall have become  untrue or such
breach,  then META may not terminate this Agreement  under Section 8.1(h) during
such five-day  period provided  SENTRY  continues to exercise such  commercially
reasonable efforts;

            (i) by  SENTRY,  upon a  breach  of  any  representation,  warranty,
covenant or agreement on the part of META set forth in this Agreement, or if any
representation or warranty of META shall have become untrue, in either case such
that the  conditions  set forth in Section 7.3(a) or Section 7.3(b) would not be
satisfied as of the time of such breach or as of the time such representation or
warranty shall have become untrue,  provided,  that if such inaccuracy in META's
representations  and warranties or breach by META is curable by META through the
exercise of its commercially reasonable efforts within five (5) days of the time
such  representation  or warranty shall have become untrue or such breach,  then
SENTRY may not terminate  this  Agreement  under this Section 8.1(i) during such
five-day period provided META continues to exercise such commercially reasonable
efforts.

      8.2 Notice of Termination;  Effect of Termination. Any termination of this
Agreement  under  Section  8.1  above  will be  effective  immediately  upon the
delivery of written notice of the terminating party to the other parties hereto.
In the event of the  termination  of this  Agreement as provided in Section 8.1,
this Agreement  shall be of no further force or effect,  except (i) as set forth
in this Section 8.2,  Section 8.3 and Article X  (Miscellaneous),  each of which
shall survive the termination of this  Agreement,  and (ii) nothing herein shall
relieve any party from  liability for any willful breach of this  Agreement.  No
termination  of this  Agreement  shall  affect the  obligations  of the  parties
contained  in the  Confidentiality  Agreement,  all of which  obligations  shall
survive  termination  of this Agreement in accordance  with their terms.  In the
event this Agreement is terminated,  the agreements of SENTRY and META contained
in Sections 5.1(c), 5.1(d), Article IX and 10.1 shall survive such termination.

     8.3 Procedure  Upon  Termination.  In the event of the  termination of this
Agreement,  the Board or Boards of  Directors so  terminating  may direct its or
their officers not to file the articles of merger in the office of the Secretary
of  the  Commonwealth  of the  Commonwealth  of  Massachusetts,  notwithstanding
favorable action by the stockholders of the Company and SENTRY.
                                 
                                   ARTICLE IX

                          SURVIVAL; INDEMNIFICATION

      9.1 Survival. The covenants, agreements, representations and warranties of
SENTRY  contained in this Agreement  shall survive the Closing until the earlier
of (i) the  Contingent  Closing Date  (assuming no objections to the  Contingent
<PAGE> 42

Consideration are filed pursuant to the terms hereunder), (ii) if objections are
so filed,  the second  anniversary of the date hereof and (iii) if no Contingent
Consideration is payable hereunder,  the date on which Contingent  Consideration
would have been paid on a Contingent Closing Date if it were being paid pursuant
to the terms hereof (the "Implied Contingent Closing Date"); provided,  however,
that the  covenants,  agreements,  representations  and  warranties set forth in
Section 3.16 shall survive until the  applicable  statutes of  limitations  with
respect  to  Taxes  shall  have  expired;  provided,   further,  that  any  such
termination pursuant to this sentence shall not terminate or limit in any manner
whatsoever any  liabilities  SENTRY has or may have for knowing and  intentional
misrepresentations,  breaches,  nonfulfillments and violations.  Notwithstanding
the preceding sentence, any covenant,  agreement,  representation or warranty in
respect of which  indemnity  may be sought under  Section 9.2 shall  survive the
time at which it would otherwise  terminate pursuant to the preceding  sentence,
if notice of the  inaccuracy  or breach  thereof  giving  rise to such  right to
indemnity  shall have been given to the party against whom such indemnity may be
sought  prior to such  time.  The  covenants,  agreements,  representations  and
warranties  of SENTRY and the rights and  remedies  that may be exercised by any
Indemnitee  shall not be limited,  diminished  or otherwise  affected by or as a
result of any  information  that may have been provided,  any  investigation  or
examination  that may have or be made by, or any knowledge of, any Indemnitee or
any other party on the behalf of any Indemnitee.

      The  agreement  of the  Stockholder  Representative  set forth in the last
sentence of Section 2.3(e)(viii)(A) shall survive the Closing.

      The covenants, agreements,  representations and warranties of META and the
Company  contained in this  Agreement  shall not survive the Closing;  provided,
however,  that the  covenants and  agreements  set forth in Sections 1.8 and 2.3
shall survive the Closing until the  Contingent  Closing Date or, if there is no
Contingent Closing Date, the Implied Contingent Closing Date.

      9.2 Indemnification. Except as set forth in Section 9.4, by their approval
of this Agreement,  the  stockholders of SENTRY,  jointly and severally  (except
with respect to Sections 9.2(i) and 9.2(ii) as they apply to Major  Stockholders
with respect to the Participation  Agreement or Section 9.2(iii), in which cases
the  indemnification  obligations set forth in this Section 9.2 shall be several
but not joint), agree to indemnify,  defend,  protect, and hold harmless each of
META and its officers,  directors,  shareholders and employees and, effective at
and as of the Effective Time, without duplication, the Surviving Corporation and
its officers, directors, shareholders and employees and each of their respective
subsidiaries  and affiliates  (each in its capacity as an indemnified  party, an
"Indemnitee")  at all times from and after the date of this  Agreement  from and
against all claims, damages, actions, suits, proceedings,  demands, assessments,
adjustments,  losses,  costs and expenses (including  specifically,  but without
limitation,  the reasonable fees and expenses of one counsel (subject to Section
9.3),  costs and  expenses in  connection  with any action or  proceeding  or in
connection  with any  investigation,  whether or not resulting in any liability)
(collectively "Damages") incurred by such Indemnitee as a result of, arising out
of or incident to (i) any inaccuracy or breach (or alleged inaccuracy or breach)
of any representation or warranty, covenant or agreement of SENTRY or any of the
Major Stockholders set forth herein or, with respect to the Major  Stockholders,
in  the  Participation  Agreement,  or in  any  certificate  or  other  document
<PAGE> 43

delivered  in  connection  herewith  or  therewith  (as such  representation  or
warranty, covenant or agreement would read if all qualifications as to knowledge
and materiality and Material  Adverse Effect on SENTRY were deleted from it and,
with respect to the representations  and warranties  qualified by Schedule 3.14,
as though such  representations and warranties were not so qualified,  such that
any matters set forth in such Schedule are subject to indemnification hereunder)
with respect to which a claim for  indemnification  is brought by an  Indemnitee
within the applicable  survival period described in Section 9.1, (ii) any breach
or  nonfulfillment  by SENTRY or any of the Major  Stockholders,  any failure to
perform or any  noncompliance by SENTRY or any of the Major  Stockholders  with,
any covenant,  agreement,  or obligation  contained herein,  with respect to the
Major  Stockholders,  in the Participation  Agreement,  or in any certificate or
other document  delivered in connection  herewith except to the extent waived by
META,  (iii) any claim by a stockholder  or former  stockholder of SENTRY or any
other person, firm, corporation or entity, seeking to assert, or based upon: (A)
ownership or rights of ownership to any shares of capital  stock of SENTRY;  (B)
any  rights of the  stockholder  (other  than the right to  receive  the  Merger
Consideration   pursuant  to  this  Agreement  or  appraisal  rights  under  the
applicable   provisions  of  the  Massachusetts  BCL),   including  any  option,
preemptive  rights,  or rights to notice or to vote;  (C) any  rights  under the
articles of organization or bylaws of SENTRY;  or (D) any claim that his, her or
its shares  were  wrongfully  repurchased  by SENTRY,  regardless  of whether an
action,  suit or preceding can or has been made against SENTRY,  (iv) any suits,
actions,  proceedings or claims  brought by any former  employee of SENTRY which
suits,  actions,  proceedings  or claims  arise out of or relate to such  former
employee's  employment (or severance  from or  termination  of employment)  with
SENTRY  or any  agreements,  oral or  written,  including,  without  limitation,
severance and release agreements,  between SENTRY and such former employee,  (v)
the sale of SENTRY's  magazine  publishing  operations and certain lists related
thereto to Wiesner and any and all other  transactions  contemplated by the Book
Purchase Agreement, (vi) SENTRY options, warrants, exchange rights, subscription
rights,  rights to  convert  or  exchange  securities,  call or put  rights,  or
commitments  or  agreements  with  respect  to any of the  foregoing,  (vii) any
inaccuracy or  misstatement  or omission in the Closing Balance Sheet, or (viii)
subject  to  compliance  with the  procedures  set  forth in  Section  9.3,  the
settlement   of  any  alleged   inaccuracy,   breach,   failure  to  perform  or
noncompliance  of the type  referred  to in clause (i) and (ii) of this  Section
9.2.

      By their approval of this Agreement, the stockholders of SENTRY agree that
the  Escrow  Account  shall be  available  to satisfy  any claims  brought by an
Indemnitee under this Article IX.

      9.3 Third Person Claims.  Promptly after an Indemnitee has received notice
of or has  knowledge of any actual or threatened  claim or potential  claim by a
person not a party to this Agreement ("Third Person") or the commencement of any
action or proceeding by a Third Person,  the  Indemnitee  shall,  as a condition
precedent to a claim with respect thereto being made against the stockholders of
SENTRY,  give the Stockholders'  Representative  written notice of any actual or
threatened  claim or  potential  claim or the  commencement  of such  action  or
proceeding (a "Notice of Claim");  provided,  however,  that the failure to give
such Notice of Claim will not effect the Indemnitees'  right to  indemnification
hereunder with respect to such claim, action or proceeding, except to the extent
that the  Stockholders'  Representative  has,  or the  stockholders  have,  been
actually  and  materially  prejudiced  as a  result  of  such  failure.  If  the
Stockholder  Representative  notifies  the  Indemnitee  within  30 days from the
receipt of the  foregoing  Notice of Claim that he wishes to defend  against the
claim by the Third  Person and if the  estimated  amount of the claim,  together
with all  other  claims  made  against  the  Escrow  Account  that have not been
settled,  is less than the  remaining  balance of the Escrow  Account,  then the
Stockholder  Representative  shall  have the right to  assume  and  control  the
defense  of  the  claim  by  appropriate  proceedings  with  counsel  reasonably
acceptable to Indemnitee,  and the Stockholder  Representative shall be entitled
to reimbursement out of the Escrow Account for such defense; provided,  however,
that in no event  shall any such  reimbursement  exceed  20% of the value of the
Escrow  Account.  The  Indemnitee may  participate  in the defense,  at its sole
expense of any such claim for which the  Stockholder  Representative  shall have
assumed the defense  pursuant to the preceding  sentence,  provided that counsel
for the  Stockholder  Representative  shall act as lead  counsel in all  matters
pertaining  to the defense or settlement  of such claims,  suit or  proceedings;
provided, however, that Indemnitee shall have the exclusive right to control the
<PAGE> 44

defense of any claim or  proceeding  that in  Indemnitee's  reasonable  judgment
could have a material and adverse effect on Indemnitee's business apart from the
payment of money damages,  except that Indemnitee  shall not make any settlement
with respect to any Third Person  claim,  suit or  proceeding  without the prior
consent  of the  Stockholder  Representative,  which such  consent  shall not be
unreasonably  withheld.  The Indemnitee shall be entitled to indemnification for
the reasonable  fees and expenses of its counsel for any period during which the
Stockholder  Representative  has not  assumed  the  defense of any  claim.  Each
Indemnitee shall have the right to employ separate counsel and to participate in
the defense of any action in which the  Stockholder  Representative  has assumed
the  defense,  but the fees  and  expenses  of such  counsel  subsequent  to any
assumption of the defense by the Stockholder  Representative shall not be at the
expense of the Stockholder Representative except in the event (i) the employment
of such counsel has been  specifically  authorized in writing by the Stockholder
Representative,  (ii)  the  defendants  in any  such  action  include  both  the
Indemnitee  and any  SENTRY  Stockholder  and the  interests  of the  Indemnitee
reasonably  may be  deemed  to  conflict  with  the  interests  of  such  SENTRY
Stockholder or (iii) the Stockholder  Representative shall have failed to assume
the defense within a reasonable  period of time after notice of  commencement of
the action.  The Stockholder  Representative  shall not make any settlement with
respect to any claim,  suit or  proceeding  without  the prior  consent of META,
which can be withheld for any or no reason.

      9.4  Limitations on  Indemnification.  An Indemnitee  shall be entitled to
indemnification   under  Section  9.2  for  Damages   relating  to  breaches  of
representations  and  warranties  set  forth  herein  or  in  the  Participation
Agreement or in any certificate or document delivered in connection  herewith or
therewith  all as provided in Section  9.2(i),  only with  respect to amounts by
which Damages incurred exceeds  $100,000.  The limitation  provided in the first
sentence of this Section 9.4 on an Indemnitee's right to  indemnification  under
this Article IX shall not apply to Damages for any matters set forth in Sections
9.2(ii)-(viii).  An Indemnitee  shall not be entitled to  indemnification  under
this  Article IX for a claim to the extent  insurance  proceeds  are received in
respect of such claim pursuant to a valid insurance policy (provided such policy
is not voided or  nullified  in any  respect by reason of this  sentence  or the
limits on indemnification contained herein).

      9.5 Method of  Payment;  Nonexclusivity.  Any  claims for  indemnification
pursuant to this  Article IX shall be  satisfied  first from the Escrow  Account
prior to  satisfying  claims for  indemnification  directly  from one or more of
SENTRY's  stockholders.  Other than with  respect  to claims  made  pursuant  to
Sections  9.2(v),  9.2(vi) and 9.2(vii),  and except for claims based on knowing
and intentional misrepresentations,  breaches, nonfulfillments and violations or
based on common law fraud, no SENTRY  stockholder  shall be liable for an amount
in  excess  of the value  (such  consideration  to be valued at the time of such
receipt)  of  the  shares  of  META  Common,   the   Warrants   and   Contingent
Consideration,  if any, actually  received by such stockholder  pursuant to this
Agreement;   provided,  however,  that  if  a  stockholder  receives  additional
consideration hereunder or under the Escrow Agreement,  such consideration shall
become available to satisfy indemnification claims which, but for the first part
of this sentence,  would have been satisfied;  provided,  further, that, for the
sake of clarity, any Escrow Shares held by the Escrow Agent for the account of a
shareholder  shall  be  deemed  "actually  received"  for the  purposes  of this
sentence.   Any   availability  of  the  Escrow  Account  for   satisfaction  of
indemnification  claims  hereunder  shall in no way limit the obligations of the
stockholders of SENTRY to indemnify the Indemnitees hereunder in accordance with
this  Article IX. To the extent that any  Indemnitee  makes a claim  against any
Escrow Shares in the Escrow Account pursuant to the Escrow  Agreement,  and such
claim is paid in shares of META Common,  then for purposes of such payment,  the
shares of META  Common  shall be valued at the Final  META Stock  Price.  If the
Escrow  Shares  in the  Escrow  Account  are to be valued  for any other  reason
hereunder, such shares shall also be valued at the Final META Stock Price.

      9.6 Directors and Officers  Indemnification.  The Articles of Organization
and  By-laws of the  Surviving  Corporation  will  contain the  provisions  with
respect to indemnification and elimination of liability for monetary damages set
forth in the Articles of Organization and By-laws of SENTRY immediately prior to
<PAGE> 45

the Effective Time, which provisions will not be amended,  repealed or otherwise
modified  for a period of two years from the  Effective  Time in any manner that
would  adversely  affect  the  rights  thereunder  of  individuals  who,  at the
Effective Time, were directors,  officers, employees or agents of SENTRY, unless
such  modification  is required by law.  Notwithstanding  Sections  1.4 and 1.5,
after the Effective Time the Surviving  Corporation  will, to the fullest extent
permitted under applicable law or under the Surviving  Corporation's Articles of
Organization  or By-laws,  indemnify,  defend and hold harmless each present and
former officer or director of SENTRY (collectively,  the "Indemnified  Parties")
against costs or expenses (including  reasonable  attorneys' fees and expenses),
judgments,  losses, claims, action, suit, proceeding (whether civil, criminal or
administrative),  to the extent  arising out of or  pertaining  to any action or
omission in his or her  capacity as a director or officer of SENTRY  arising out
of or  pertaining  to the  transactions  contemplated  by this  Agreement.  This
Section 9.6 will survive the  consummation  of the Merger at the Effective Time,
is intended to benefit  SENTRY,  the Surviving  Corporation  and the Indemnified
Parties,  and will be binding on all  successors  and  assigns of the  Surviving
Corporation.

      9.7 No Contribution. The stockholders of SENTRY acknowledge and agree that
they shall not have and shall not exercise or assert any right of  contribution,
indemnification,  subrogation  or other  remedy or right  against the  Surviving
Corporation in connection with any indemnification obligation or other liability
to which they may become subject under or in connection with this Agreement,  or
any certificate or other document delivered in connection herewith.


                                  ARTICLE X

                                MISCELLANEOUS

     10.1  Other  Remedies:Specific  Performance.  Any and all  remedies  herein
expressly  conferred upon a party will be deemed cumulative and not exclusive of
any other remedy conferred  hereby, or by law or equity upon such party, and the
exercise  by a party of any one remedy  will not  preclude  the  exercise of any
other remedy.  The parties hereto agree that  irreparable  damage would occur in
the event that any of the  provisions  of this  Agreement  were not performed in
accordance  with  their  specific  terms  or  were  otherwise  breached.  It  is
accordingly  agreed that the  parties  shall be  entitled  to an  injunction  or
injunctions to prevent  breaches of this  Agreement and to enforce  specifically
the terms and  provisions  hereof in any court of the United States or any state
having  jurisdiction,  this being in addition to any other  remedy to which they
are entitled at law or in equity.

     10.2 Expenses.  All fees and expenses (including all accounting,  legal and
investment  banking fees and expenses and all other  expenses)  incurred by META
and  the  Company  in  connection  with  this  Agreement  and  the  transactions
contemplated  hereby  will be borne by META.  All fees and  expenses  (including
without  limitation  all  accounting,  legal  and  investment  banking  fees and
expenses)  incurred  by  SENTRY  in  connection  with  this  Agreement  and  the
transactions  contemplated hereby will be borne by SENTRY. All fees and expenses
(including  all  accounting,  legal and  investment  banking fees and  expenses)
incurred by the stockholders of SENTRY in connection with this Agreement and the
transactions contemplated hereby will be borne by such stockholders.

     10.3 Further  Assurances.  If at any time after the Effective Time, META or
the Company shall consider it advisable that any further conveyance, agreements,
documents,  instruments  and assurances of law or any other things are necessary
or desirable to vest,  perfect,  confirm or record in the Surviving  Corporation
the title to any property, rights, privileges,  powers and franchises of SENTRY,
<PAGE> 46

the  officers  of SENTRY last in office and such other  persons,  if any, as the
Board of  Directors  of SENTRY last in office may  authorize  shall  execute and
deliver,  upon META's or the Company's request,  any and all proper conveyances,
agreements,  documents,  instruments  and  assurances  of law, and do all things
reasonably necessary or proper to vest, perfect, confirm or record title to such
property,   rights,   privileges,   powers  and   franchises  in  the  Surviving
Corporation,  and otherwise to carry out the  provisions of this  Agreement.  By
their  approval of this  Agreement,  the  stockholders  of SENTRY  agree to make
themselves available and to otherwise assist META and the Surviving  Corporation
after the Effective Time in carrying out the terms and intent of this Agreement.

     10.4 Parties in Interest.  All the terms and  provisions of this  Agreement
shall be binding upon, shall inure to the benefit of and shall be enforceable by
the respective  successors and permitted assigns of the parties hereto.  Nothing
expressed  or implied in this  Agreement  is intended or shall be  construed  to
confer  upon or give any  person,  firm or  corporation  other than the  parties
hereto, their permitted successors or assigns, and their respective stockholders
any rights or remedies under or by reason of this  Agreement or any  transaction
contemplated hereby.
          
     10.5 Entire  Agreement.  This  Agreement , together  with the Schedules and
Exhibits hereto,  supersede any other  agreement,  whether written or oral, that
may have been made or  entered  into by META and  SENTRY  (or by any  officer or
officers  of such  parties)  relating  to the  matters  contemplated  hereby  or
thereby. This Agreement,  the Participation  Agreement,  the Registration Rights
Agreement  and the Escrow  Agreement,  together  with the Schedules and Exhibits
hereto and thereto,  constitute the entire  agreement by the parties,  and there
are no agreements or commitments except as set forth herein and therein.

     10.6 Amendment or Modification. At any time before or after the adoption of
this Agreement by the  stockholders of SENTRY,  this Agreement may be amended or
supplemented  by  additional  agreements,  articles or  certificates,  as may be
mutually  determined  by  the  parties  hereto  to be  necessary,  desirable  or
expedient to further the purposes of this Agreement, or to clarify the intention
of the  parties  hereto,  or to add to or to  modify  the  covenants,  terms  or
conditions  hereof or to effect  or  facilitate  any  governmental  approval  or
acceptance  of the Merger or of this  Agreement or to effect or  facilitate  the
filing  or  recording  of  this  Agreement  or  the  consummation  of any of the
transactions contemplated hereby.

     10.7  Waiver.  Any party to this  Agreement  may, by written  notice to the
other parties to this Agreement,  (a) extend the time for the performance of any
of the  obligations or other actions of the other parties under this  Agreement;
(b) waive any  inaccuracies  in the  representations  or warranties of the other
parties  contained in this  Agreement or in any document  delivered  pursuant to
this Agreement;  (c) waive compliance with any of the conditions or covenants of
the  other  parties  contained  in  this  Agreement;  or  (d)  waive  or  modify
performance of any of the obligations of the other parties under this Agreement.
Except as provided in the preceding  sentence,  no action taken pursuant to this
Agreement, including without limitation any investigation by or on behalf of any
party, shall be deemed to constitute a waiver by the party taking such action of
compliance  with  any  representations,  warranties,  covenants,  conditions  or
agreements  contained  in this  Agreement.  The  failure of any party  hereto to
enforce at any time any of the provisions of this  Agreement  shall in no way be
construed  to be a waiver of any such  provision,  nor in any way to affect  the
validity  of this  Agreement  or any part  hereof  or the  right  of such  party
thereafter to enforce each and every such provision.  No waiver of any breach of
or non-compliance  with this Agreement shall be held to be a waiver of any other
or subsequent breach or non-compliance.

     10.8  Assignability.  This Agreement shall not be assignable by SENTRY,  on
the one hand,  or META or the  Company,  on the other  hand,  without  the prior
<PAGE> 47

written  consent of META, on the one hand, or SENTRY,  on the other hand, as the
case may be.

     10.9 Certain  Definitions:  For purposes of this  Agreement,  the following
terms shall have the meanings set forth below:

     "affiliate"  shall  mean,  when used with  respect to a  specified  person,
another person that directly,  or indirectly through one or more intermediaries,
controls  or is  controlled  by or is  under  common  control  with  the  person
specified;

     "CERCLA" means the Comprehensive  Environmental Response,  Compensation and
Liability Act of 1980, as amended.

     "control" (including,  with its correlative  meanings,  "controlled by" and
"under common control with") shall mean possession,  directly or indirectly,  of
power to  direct or cause the  direction  of  management  or  policies  (whether
through ownership of securities or partnership or other ownership interests,  by
contract or otherwise);

     "Environmental  Laws"  means  any and all  laws  or  regulations,  judicial
decisions,  orders or  permits  relating  to the  environment  or to  emissions,
discharges  or releases of  pollutants,  contaminants,  petroleum  or  petroleum
products, chemicals or industrial, toxic, radioactive or hazardous substances or
wastes into the environment including, without limitation,  ambient air, surface
water,  ground  water,  or  land,  or  otherwise  relating  to the  manufacture,
processing,  distribution,  use,  treatment,  storage,  disposal,  transport  or
handling of pollutants, contaminants, petroleum or petroleum products, chemicals
or  industrial,  toxic,  radioactive or hazardous  substances  medical wastes or
other wastes or the clean-up or other remediation thereof.

     "Environmental  Liabilities"  means all  liabilities  arising in connection
with or in any way relating to the assets of SENTRY or SENTRY's use or ownership
thereof,  whether vested or unvested,  contingent or fixed, actual or potential,
which (i) arise  under or relate to  Environmental  Laws or arise in  connection
with or relate to any matter  disclosed  or required to be disclosed in Schedule
3.22 and (ii) arise from or relate in any way to actions occurring or conditions
existing before the Closing Date.

     "Final  META Stock  Price"  shall mean the  average  closing  price of META
Common  (rounded to the nearest  penny) for the five (5) trading  days ending on
and including the second-to-last trading day which immediately precedes the date
on which a payment is made  pursuant to Section  9.5 or a  valuation  is made of
Escrow Shares for any other reason  hereunder,  as the case may be, in each case
calculated on the basis of the last  reported  sales price of META Common on the
Nasdaq National Market.

     "Hazardous  Substance" means petroleum products or hazardous  substances as
defined in Section 101 of CERCLA.

     "META  Closing  Price" shall mean the average  closing price of META Common
(rounded to the nearest  penny) for the twenty (20)  trading  days ending on and
including the second-to-last  trading day which immediately precedes the Closing
Date, calculated on the basis of the last reported sales price of META Common on
the Nasdaq National Market.
<PAGE> 48

     "META  Contingent  Closing  Price" shall mean the average  closing price of
META  Common  (rounded to the nearest  penny) for the twenty (20)  trading  days
ending  on and  including  the  second-to-last  trading  day  which  immediately
precedes  the  Contingent  Closing  Date,  calculated  on the  basis of the last
reported sales price of META Common on the Nasdaq National Market.

      "Options  Exchange Ratio" shall mean that number obtained by computing (to
four decimal places) the following formula:

                                    A      / E
                               ----------
                                B + (C-D)

, where:

   A  =        *       
   B  =  the  number  of  issued  and  outstanding  shares  of  SENTRY  Common
         immediately prior to the Effective Time
   C  =  722,582
   D  =  the number of shares of SENTRY Common underlying  options to purchase
         SENTRY Common listed on Schedule 10.9,  which options are  subsequently
         terminated for any reason prior to the Effective Time
   E  =  the META Closing Price

     "person"  shall  mean any  individual,  corporation,  partnership,  limited
liability   company,   trust,   joint   venture,   unincorporated   association,
Governmental Authority or other entity; and

     "Release" has the meaning specified in 42 U.S.C. ss. 9601(22).

     "SENTRY Stock Option Plans" shall mean the Amended and Restated 1996 Equity
Compensation Plan.

     "SENTRY Warrants" shall mean the outstanding SENTRY Common Purchase Warrant
to  purchase  an  aggregate  of 103,820  shares of SENTRY  Common  with a stated
exercise  price  of  $3.615  and  issued  on  November  12,  1996  to  Safeguard
Scientifics (Delaware), Inc.

     "subsidiary"  of any  person  shall  mean a  corporation,  company or other
entity (i) more than 50% of whose outstanding shares or securities (representing
the right to vote for the  election of directors  or other  managing  authority)
are, or (ii) which does not have outstanding shares or securities (as may be the
case  in  a   partnership,   limited   liability   company,   joint  venture  or
unincorporated  association),  but more  than 50% of  whose  ownership  interest
representing  the right to make  decisions  for such  other  entity  is,  now or
hereafter owned or controlled, directly or indirectly, by such person.

     "Surviving   Corporation  Auditors"  shall  mean  a  nationally  recognized
independent auditing firm chosen by META, which firm may be META's auditors.

     "Surviving  Corporation  Operating  Income" shall be prepared in accordance
with the  principles  set forth in Schedule  2.3(e) and shall mean the Surviving
Corporation  Revenues less operating  expenses of the Surviving  Corporation for
the twelve month period ending  December 31, 1999  determined in accordance with
generally  accepted  accounting  principles  applied on a  consistent  basis and
consistent with the accounting principles on the basis of which SENTRY's audited
financial  statements  for the twelve month period ended  December 31, 1997 were
prepared, including, but not limited to:
<PAGE> 49

                 (v)  cost of services and fulfillment,

                 (w)  selling and marketing,

                 (x)  general and administrative, and

                 (y)   depreciation   and   amortization   (including,   without
                 limitation,   amortization  of  goodwill  associated  with  the
                 Initial Consideration).

     "Surviving Corporation Operating Margin" shall mean the percentage computed
by  multiplying  100  by  the  quotient   obtained  by  dividing  the  Surviving
Corporation Revenues into the Surviving Corporation Operating
Income.

     "Surviving  Corporation  Revenues"  shall  mean the total  revenues  of the
Surviving  Corporation  for the twelve  month  period  ending  December 31, 1999
determined in accordance with generally accepted  accounting  principles applied
on a consistent basis and consistent with the accounting principles on the basis
of which SENTRY's audited financial statements for the twelve month period ended
December  31,  1997 were  prepared,  and  appropriately  adjusted  to  eliminate
intercompany accounts and Book Escrow Payments, if any, and the other principles
set forth in Schedule 2.3(e).

     10.10 Headings and Interpretation. The headings contained in this Agreement
are  for   reference   purposes  only  and  shall  not  affect  the  meaning  or
interpretation  of  this  Agreement.   Terms  such  as  "herein,"  "hereof"  and
"hereinafter"  refer  to this  Agreement  as a whole  and not to the  particular
sentence or paragraph where they appear,  unless the context otherwise requires.
Whenever  the  words  "include,"  "includes"  or  "including"  are  used in this
Agreement they shall be deemed to be followed by the words "without limitation."
The phrase "made  available" in this Agreement  shall mean that the  information
referred  to has been  made  available  if  requested  by the party to whom such
information is to be made available.  Unless the context otherwise requires, (i)
terms used in the plural include the singular, and vice versa, and (ii) words in
the masculine gender include the feminine, and vice versa.

     10.11 Notices.  All notices and other  communications  under this Agreement
shall be in writing and shall be delivered by hand or overnight courier service,
mailed or sent by telex,  graphic scanning or other  telegraphic  communications
equipment of the sending party, as follows:

     If to META or the Company:

           META Group Inc.
           208 Harbor Drive
           Stamford, CT 06912-0061
           Attention:  Bernard F. Denoyer, Chief Financial Officer

           with a copies to:

           Testa, Hurwitz & Thibeault, LLP
           High Street Tower
           125 High Street
           Boston, Massachusetts  02110
           Attention:  Mark J. Macenka, Esq.
<PAGE> 50

     If to SENTRY:

           The Sentry Group, Inc.
           One Research Drive, Suite 400B
           Westborough, MA 01581
           Attention:  Allan Shriber, Chief Financial Officer

     with a copy to:

           Robert DeN. Cope, Esq.
           44 Elm Street, Suite 503
           Worcester, Massachusetts  01609-2523

or to such  other  address  as any party  may have  furnished  to the  others in
writing in accordance  herewith,  except that notices of change of address shall
only be effective upon receipt.  All notices and other  communications  given to
any party hereto in accordance  with the provisions of this  Agreement  shall be
deemed  to have  been  given  on the date of  receipt  if  delivered  by hand or
overnight  courier  service  or  sent  by  telex,   graphic  scanning  or  other
telegraphic communications equipment of the sender, or on the date five business
days after  dispatch by certified  or  registered  mail if mailed,  in each case
delivered, sent or mailed (properly addressed) to such party as provided in this
Section 10.11 or in accordance  with the latest  unrevised  direction  from such
party given in accordance with this Section 10.11.

     10.12 Law Governing.  This Agreement shall be governed by and construed and
enforced  in  accordance  with the laws of the  Commonwealth  of  Massachusetts,
without giving effect to the principles of conflicts of law thereof.

     10.13  Invalidity of Provisions.  Each of the provisions  contained in this
Agreement  is  distinct  and  severable  and  a  declaration  of  invalidity  or
unenforceability  of any such  provision or part thereof by a court of competent
jurisdiction  shall not  affect  the  validity  or  enforceability  of any other
provision  hereof.  The parties  agree to replace such invalid or  unenforceable
provision of this  Agreement  with a valid and  enforceable  provision that will
achieve,  to the extent possible,  the economic,  business and other purposes of
such invalid or unenforceable provision.

     10.14 Counterparts;  Facsimile  Signatures.  This Agreement may be executed
simultaneously in one or more counterparts,  each of which shall be deemed to be
an  original  but all of  which  together  shall  constitute  one  and the  same
instrument.  For the purposes of executing this Agreement, (a) a document signed
and  transmitted  by  facsimile  machine  or  telecopier  shall be treated as an
original  document;  (b) the  signature of any party on such  document  shall be
considered  as an  original  signature;  (c) the  document  transmitted  (or the
document of which the page containing the signature or signatures of one of more
parties is  transmitted)  shall have the same  effect as a  counterpart  thereof
containing  original  signatures;  and (d) at the request of a party, each party
who executed a document and  transmitted  such document by facsimile  machine or
telecopier,  shall provide such original  document to the other party.  No party
may  raise as a  defense  to the  enforcement  of this  Agreement  or any  other
document  required to be delivered in accordance  with its terms,  including any
amendment thereof, that a facsimile machine or telecopier was used to transmit a
signature of that party or another party on the Agreement,  other  document,  or
amendment.

                 [REMAINDER OF PAGE LEFT BLANK INTENTIONALLY]
<PAGE> 51

     IN WITNESS WHEREOF,  this Agreement has been duly executed and delivered by
the parties on the date first above written.


Attest:                                 META GROUP, INC.

/S/ Bernard F. Denoyer
- ---------------------                       By: /s/ Dale Kutnick
Name: Bernard F. Denoyer                       -----------------------------
Title: CFO, VP-Finance                      Name:  Dale Kutnick
                                            Title: President
           [seal]

                                            
                                            By: /s/ Bernard F. Denoyer
                                                --------------------------
                                            Name:  Bernard F. Denoyer
                                            Title: Treasurer
Attest:
                                            MG ACQUISITION CORPORATION
/s/ Bernard F. Denoyer
- ----------------------
Name: Bernard F. Denoyer                    By: /s/Dale Kutnick  
Title:CFO, VP-Finance,                          ---------------------------
      Secretary & Treasurer                 Name:  Dale Kutnick
                                            Title: President


                                            
           [seal]                           By: /s/ Bernard F. Denoyer
                                                ---------------------------
                                            Name:  Bernard F. Denoyer
                                            Title: Vice President  
Attest:                                       
                                            
                                            THE SENTRY GROUP, INC.

/s/ Robert DeN. Cope
- -----------------------------               By: /s/ Robert H. Cawly
Name: Robert DeN. Cope                          ----------------------------
Title: Clerk                                Name:  Robert H.Cawly
                                            Title: President and CEO
    
[seal]      
                                            By: /s/ Allan N. Shriber
                                                -----------------------------
                                            Name:  Allan N. Shriber
                                            Title: Treasurer

<PAGE>
     In accordance with Item 601 (b)(2) of Regulation S-X, the Schedules to
this Agreement have not been filed.  The omitted schedules principally contain
disclosure information with respect to Sentry which supplements Sentry's
representations and warranties and consist of various corporate matters, 
financial matters, liabilities, properties, material contracts, employee
matters, and other matters.  The registrant hereby agrees to furnish
supplementally a copy of any omitted schedule to the Commission upon request.




                               AMENDMENT NO. 1
                                      TO
                         AGREEMENT AND PLAN OF MERGER


      This Amendment No. 1 (the "Amendment") to Agreement and Plan of Merger
by and among META Group, Inc. ("META"), MG Acquisition Corporation
("Acquisition Sub") and The Sentry Group, Inc. ("SENTRY") dated as of
September 23, 1998 (the "Agreement"):

                                 WITNESSETH:

      WHEREAS, each of the parties hereto is a party to the Agreement; and

      WHEREAS,  each of META,  Acquisition  Sub and SENTRY  desires to amend the
Agreement  as set forth below to permit the Closing  Date to be October 20, 1998
and to provide for an additional  Currently  Exercisable Warrant to purchase one
share of META Common for each Former SENTRY Holder;

      NOW,  THEREFORE,  in  consideration  of  these  premises  and  the  mutual
agreements  contained in this Amendment,  in accordance with Section 10.6 of the
Agreement each of META, Acquisition Sub and SENTRY hereby agrees as follows:


                                  ARTICLE I

                           AMENDMENTS TO AGREEMENT

      1.1 Amendment to Section 6.1 of the Agreement.  Each of the parties hereto
hereby agrees to amend Section 6.1 of the Agreement by substituting "October 20,
1998" in the first sentence of Section 6.1 in lieu of "October 21, 1998."

      1.2  Amendment  regarding   Additional   Currently   Exercisable  Warrant.
Notwithstanding  Section  2.3(a)(2)(A)  and Section 2.5 of the  Agreement,  META
hereby agrees to aggregate all fractional  Currently  Exercisable Warrants which
result from the  calculation of Currently  Exercisable  Warrants to be issued as
Initial  Consideration in accordance with Section 2.3(a)(2)(A) of the Agreement,
and in exchange for such resultant  fractional Currently  Exercisable  Warrants,
META hereby agrees to increase the number of Currently  Exercisable  Warrants to
be issued to each Former SENTRY Holder  pursuant to Section  2.3(a)(2)(A) of the
Agreement  by one  Currently  Exercisable  Warrant for each such  Former  Sentry
Holder.
<PAGE>
                                  ARTICLE II

                                MISCELLANEOUS

      2.1  Ratification/Confirmation  of Agreement.  Except as herein  expressly
amended,  the  Agreement  is ratified  and  confirmed  in all respects and shall
remain in full force and effect in accordance with its terms.

      2.2 Definitions.  Capitalized  terms used herein without  definition shall
have the respective meanings ascribed to such terms in the Agreement.

      2.3 Assignment. Neither this Amendment nor any of the rights, interests or
obligations under this Amendment shall be assigned by any of the parties without
the prior written consent of the other parties.

      2.4 Headings and Captions. The headings and captions in this Amendment are
for convenience  and reference  purposes only and shall not be considered a part
of or  affect  the  construction  or  interpretation  of any  provision  of this
Amendment.

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

      2.6 Successors and Assigns. This Amendment shall be binding upon, inure to
the benefit of and may be enforced by, each of the parties to this Amendment and
their successors and assigns.

      2.7 Governing  Law.  This  Amendment  shall be governed by and  construed,
interpreted,  and enforced in accordance  with the laws of the  Commonwealth  of
Massachusetts,  without  giving  effect to the  principles  of  conflicts of law
thereof.

      2.8  Counterparts;  Facsimile  Signatures.  This Amendment may be executed
simultaneously in one or more counterparts,  each of which shall be deemed to be
an  original  but all of  which  together  shall  constitute  one  and the  same
instrument.  For the purposes of executing this Amendment, (a) a document signed
and  transmitted  by  facsimile  machine  or  telecopier  shall be treated as an
original  document;  (b) the  signature of any party on such  document  shall be
considered  as an  original  signature;  (c) the  document  transmitted  (or the
document of which the page containing the signature or signatures of one of more
parties is  transmitted)  shall have the same  effect as a  counterpart  thereof
containing  original  signatures;  and (d) at the request of a party, each party
who executed a document and  transmitted  such document by facsimile  machine or
telecopier,  shall provide such original  document to the other party.  No party
may raise as a defense to the  enforcement of this  Amendment,  that a facsimile
machine or telecopier  was used to transmit a signature of that party or another
party on the Amendment.
<PAGE>

      IN WITNESS WHEREOF,  each of META,  Acquisition Sub and Sentry have caused
this Amendment to be duly executed and delivered as of October 20, 1998.


                  META GROUP, INC.

                  By:  /s/Bernard F. Denoyer
                       -----------------------------
                  Name: Bernard F. Denoyer
                  Title:CFO, SVP-Finance, Secretary and Treasurer


                  MG ACQUISITION CORPORATION

                  By:  /s/Bernard F. Denoyer
                       ------------------------------
                  Name: Bernard F. Denoyer
                  Title:Vice President


                  THE SENTRY GROUP, INC.

                  By:  /s/Allan Shriber
                       ------------------------------
                  Name: Allan Shriber
                  Title:Treasurer



                        REGISTRATION RIGHTS AGREEMENT


      This  Registration  Rights  Agreement  dated as of October  20,  1998 (the
"Agreement") by and among META Group, Inc., a Delaware corporation ("META"), and
the  stockholders  of SENTRY (as defined  below) listed on the  signature  pages
hereto (collectively, the "Stockholders"):

                               WITNESSETH:

      WHEREAS,  META has  entered  into an  Agreement  and Plan of  Merger  (the
"Merger Agreement") dated as of the date hereof with MG Acquisition Corporation,
a Massachusetts  corporation (the "Merger Sub"),  and The Sentry Group,  Inc., a
Massachusetts  corporation ("SENTRY"),  pursuant to which the Merger Sub will be
merged with and into SENTRY (the "Merger");

      WHEREAS, in the Merger, the Stockholders SENTRY will receive,  among other
things,  shares of Common Stock,  par value $.01 per share (the "Common Stock"),
of META in  exchange  for  shares of  capital  stock of SENTRY now owned by such
stockholders; and

      WHEREAS,  the Stockholders desire to have, and META is willing to grant to
the  Stockholders,  certain  rights to have shares of Common Stock issued to the
Stockholders  in the Merger  registered  for resale to the public subject to the
terms and conditions set forth in this Agreement;

      NOW,  THEREFORE,  in  consideration  of  these  premises  and  the  mutual
agreements,  provisions and covenants contained in this Agreement and other good
and  valuable  consideration,  the receipt and  sufficiency  of which are hereby
acknowledged, META and the Stockholders agree as follows:


                                  ARTICLE I

                        DEFINITIONS AND EFFECTIVENESS

      1.1  Common  Definitions.  Unless  otherwise  defined  in this  Agreement,
capitalized  terms  used  in this  Agreement  that  are  defined  in the  Merger
Agreement shall have the meanings assigned to them in the Merger Agreement,  and
the rules of construction  and  documentary  conventions set forth in the Merger
Agreement shall apply to this Agreement.

      1.2 Certain  Definitions.  For purposes of this  Agreement,  the following
terms shall have the meanings set forth below:

            "Black-out  Period"  shall mean,  with respect to META,  that period
commencing on the 15th day of each of March,  June,  September,  and December of
any year and  ending  48 hours  after  the  public  announcement  by META of its
earnings for its fiscal year or quarter, as the case may be.

            "Potential Material Event" shall mean any of the following:  (a) the
possession by META of material non-public  information  required to be disclosed
in the Resale Registration Statement, and the determination in good faith by the
<PAGE>

Board of Directors of META that  disclosure  of such  information  in the Resale
Registration  Statement  at that time would  either not be  advisable  or may be
detrimental to the business and affairs of META; or (b) any material  engagement
or activity by META which would, in the good faith determination of the Board of
Directors  of  META,   be  adversely   affected  by  disclosure  in  the  Resale
Registration Statement at such time, which determination shall be accompanied by
a good faith  determination  by the Board of  Directors  of META that the Resale
Registration  Statement would be materially  misleading  absent the inclusion of
such information.

            "Registration  Expenses"  means  the  expenses  incurred  by META in
complying  with  Section 2.1 hereof,  including  registration  and filing  fees,
securities  exchange  or  market  listing  fees,  printing  expenses,  fees  and
disbursements  of counsel for META,  state Blue Sky fees and  expenses,  and the
expense of any special audits incident to or required by any such  registration,
but excluding any underwriting  commissions,  discounts and selling  concessions
and any stock transfer, issuance or other taxes and fees and expenses of counsel
to the Stockholders, if any.

            "Registrable  Shares"  means any shares of Common Stock  received by
the Stockholders as Initial Consideration (other than Escrow Shares) pursuant to
Section 2.3(a)(1) of the Merger Agreement and any additional unregistered shares
received by the  Stockholders,  during the period for which the effectiveness of
the Resale  Registration  Statement  is  required to be  maintained  pursuant to
Article II, as a stock  dividend  on the  Registrable  Shares,  or pursuant to a
stock split or similar recapitalization of the Common Stock, provided,  however,
that  Registrable  Shares shall not include any such shares of Common Stock that
as of the date of the determination  (x) have previously been sold,  transferred
or  assigned  by a  Stockholder  (except as  provided  in  Section  2.13 of this
Agreement) or (y) may be sold either without limitation  pursuant to Rule 144(k)
under the  Securities Act of 1933, as amended (the  "Securities  Act") or within
the volume limitations of Rule 144 under the Securities Act.

            "Transfer"  means  any  offer to  sell,  sale,  assignment,  pledge,
transfer,  contract  to sell,  grant of any option or other  right to  purchase,
grant of any ownership interest, or other disposition or change of legal, record
or beneficial ownership, whether direct or indirect, voluntary or involuntary.

      1.3  Additional Definitions.  Each of the following terms is defined in
the Section set forth opposite such term:

               Term                                       Section
               ----                                       -------

            Agreement                                     Recitals
            Common Stock                                  Recitals
            Indemnified Party                                  2.4
            Indemnifying Party                                 2.4
            Merger                                        Recitals
            Merger Agreement                              Recitals
            Merger Sub                                    Recitals
            META                                          Recitals
            Resale Registration Statement                      2.1
            Securities Act                                     1.2
            SENTRY                                        Recitals
            Stockholders                                  Recitals

      1.4  Effectiveness.  This  Agreement  shall  become  effective  as of  the
Effective Time.
<PAGE>

                                  ARTICLE II

                             REGISTRATION RIGHTS

     2.1 Resale  Registration  Statement.  Not later than thirty (30) days after
the  Effective  Time,  META shall file a  registration  statement  (the  "Resale
Registration  Statement") on Form S-3 registering  the Registrable  Shares under
the Securities Act and shall use all  commercially  reasonable  efforts to cause
the Resale  Registration  Statement  to become  effective  as  expeditiously  as
possible and to remain  effective  until the first  anniversary of the Effective
Time. Notwithstanding the foregoing, during any Black-out Period, and, if at any
time or from  time  to time  after  the  date  of  effectiveness  of the  Resale
Registration  Statement,  META  notifies  the  Stockholders  in  writing  of the
existence of a Potential  Material Event, the Stockholders and any transferee of
a Stockholder,  shall not offer or sell any Registrable Shares, or engage in any
other  transaction  involving or relating to the Registrable  Shares,  until the
Black-out  Period  has  expired  or from the time of the  giving of notice  with
respect to a Potential  Material Event until such  Stockholder or any transferee
of a Stockholder  receives written notice from META that such Potential Material
Event  either  has been  disclosed  to the  public  or no longer  constitutes  a
Potential  Material Event. In addition,  META shall be entitled,  upon notice to
the  Stockholders in writing of the existence of a Potential  Material Event, to
withdraw or suspend the Resale  Registration  Statement  until such time as such
Potential  Material  Event either has been  disclosed to the public or no longer
constitutes  a  Potential  Material  Event,  at which  time  META  shall use all
commercially  reasonable efforts to refile or reinstate the Resale  Registration
Statement and cause it to become effective.

      2.2  Indemnification  of  Stockholders.  META  shall  indemnify  and  hold
harmless  each  Stockholder  and  each  underwriter  of the  Registrable  Shares
(including  their  officers,  directors,  affiliates and partners) so registered
(including  any broker or dealer  through whom such shares may be sold) and each
person,  if any, who controls a Stockholder or any such  underwriter  within the
meaning of Section 15 of the Securities Act from and against any and all losses,
claims,  damages,  expenses and/or liabilities  (including,  if any,  applicable
taxes, interest,  penalties and/or additions to tax)to which they or any of them
become subject under the Securities  Act,  applicable  state  securities laws or
under any other statute or at common law or otherwise,  as incurred, and, except
as hereinafter provided, shall reimburse each Stockholder, each such underwriter
and each  such  controlling  person,  if any,  for any  legal or other  expenses
reasonably  incurred by them or any of them in connection with  investigating or
defending any actions  whether or not resulting in any  liability,  as incurred,
insofar as such losses, claims, damages,  expenses,  liabilities (including,  if
any, applicable taxes, interest,  penalties and/or additions to tax), or actions
arise out of or are based upon any untrue  statement or alleged untrue statement
of a material  fact  contained  in the Resale  Registration  Statement or in the
final  prospectus  (or the Resale  Registration  Statement or prospectus as from
time to time amended or  supplemented by META) or arise out of or are based upon
the omission or alleged omission to state therein a material fact required to be
stated  therein  or  necessary  in  order  to make the  statements  therein  not
misleading, or any violation by META of any rule or regulation promulgated under
the Securities  Act or any state  securities law applicable to META and relating
to action or inaction  required of META in  connection  with such  registration,
unless (i) such untrue  statement  or alleged  untrue  statement  or omission or
alleged  omission  was  made  in the  Resale  Registration  Statement  or  final
prospectus in reliance upon and in conformity with information furnished to META
in connection  therewith by any such Stockholder (in the case of indemnification
of such  Stockholder),  any such underwriter (in the case of  indemnification of
such underwriter) or any such controlling person (in the case of indemnification
of such controlling  person) expressly for use therein, or (ii) in the case of a
sale directly by any such  Stockholder  (including a sale of shares  through any
underwriter  retained by such Stockholder to engage in a distribution  solely on
behalf of such  Stockholder),  such untrue statement or alleged untrue statement
<PAGE>

or  omission  or  alleged  omission  was  contained  in a final  prospectus  and
corrected  in an  amended  prospectus,  copies of which were  delivered  to such
Stockholder or such  underwriter on a timely basis, and such Stockholder or such
underwriter  failed to deliver a copy of the amended  prospectus  at or prior to
the  confirmation of the sale of the Registrable  Shares to the person asserting
any such loss,  claim,  damage or liability  in any case where such  delivery is
required by the Securities Act.

      2.3  Indemnification  of META. Each  Stockholder  shall indemnify and hold
harmless META,  each of its  directors,  each of its officers who have signed or
otherwise  participated in the preparation of the registration  statement,  each
underwriter  of the  Registrable  Shares so registered  (including any broker or
dealer through whom such of the shares may be sold) and each person, if any, who
controls  META within the meaning of Section 15 of the  Securities  Act from and
against any and all losses,  claims,  damages,  expenses  and/or  liabilities to
which  they  or any of  them  may  become  subject  under  the  Securities  Act,
applicable  state securities laws or under any other statute or at common law or
otherwise,  and, except as hereinafter  provided,  shall reimburse META and each
such director, officer, underwriter or controlling person for any legal or other
expenses  reasonably  incurred  by  them  or  any of  them  in  connection  with
investigating  or  defending  any  actions  whether  or  not  resulting  in  any
liability,  insofar as such losses, claims,  damages,  expenses,  liabilities or
actions  arise out of or are based upon any untrue  statement or alleged  untrue
statement of a material fact contained in the  registration  statement or in the
final prospectus (or in the registration statement or prospectus as from time to
time amended or  supplemented) or arise out of or are based upon the omission or
alleged  omission to state therein a material fact required to be stated therein
or necessary in order to make the statements  therein not  misleading,  but only
insofar as any such  statement  or  omission  was made in  reliance  upon and in
conformity with written information furnished to META in connection therewith by
such Stockholder expressly for use therein. Notwithstanding any of the foregoing
to the  contrary,  in no  event  shall  the  liability  of any  Stockholder  for
indemnification  under this Section 2.3 exceed the lesser of (i) that percentage
of the total amount of such losses, claims,  damages or liabilities  indemnified
against  which  equals the  percentage  obtained by dividing the total number of
Registrable Shares sold by such Stockholder  pursuant to the Resale Registration
Statement by the total number of Registrable  Shares sold pursuant to the Resale
Registration  Statement,  or (ii) the net proceeds  received by such Stockholder
from the resale of its Registrable Shares.

      2.4  Indemnification  Procedures. (a)Promptly after receipt by any person
entitled to indemnification  under Sections 2.2 or 2.3 (an "Indemnified  Party")
of notice of the commencement of any action in respect of which indemnity may be
sought against any person under Sections 2.2 or 2.3 (an  "Indemnifying  Party"),
such Indemnified  Party shall notify all Indemnifying  Parties in writing of the
commencement  thereof  (provided,   however,   that  failure  to  so  notify  an
Indemnifying  Party shall not relieve any Indemnifying  Party from any liability
it may have hereunder except to the extent that the  Indemnifying  Party who did
not receive such notice shall have been  materially  prejudiced by such failure)
and, subject to the provisions  hereinafter stated, the Indemnifying Party shall
be entitled to assume the defense of such action  (including  the  employment of
counsel,  who  shall be  counsel  reasonably  satisfactory  to such  Indemnified
Party), and the payment of expenses  insofar as such action shall relate to any
alleged  liability  in  respect of which  indemnity  may be sought  against the
Indemnifying Party.

            (b) The  Indemnified  Party shall have the right to employ  separate
counsel and assume its own legal  defense in any such action and to  participate
in the defense thereof,  but the fees and expenses of such counsel subsequent to
any  assumption  of the  defense by the  Indemnifying  Party shall not be at the
expense of the Indemnifying Party unless the employment of such counsel has been
specifically  authorized in writing by the Indemnifying  Party. The Indemnifying
Party shall not be liable to indemnify any Indemnified  Party for any settlement
of any such action effected  without the  Indemnifying  Party's written consent.
META shall not, except with the approval of each party being  indemnified  under
<PAGE>

this  Agreement,  consent to entry of any judgment or enter into any  settlement
which  does not  include  as an  unconditional  term  thereof  the giving by the
claimant or plaintiff to the parties being so  indemnified of a release from all
liability in respect to such claim or litigation.

      2.5 Contribution.  In order to provide for just and equitable contribution
to joint liability under the Securities Act in any case in which any Indemnified
Party exercising rights under this Agreement,  or any controlling  person of any
such Indemnified  Party, makes a claim for  indemnification  pursuant to Section
2.2 or 2.3 but it is judicially  determined (by the entry of a final judgment or
decree by a court of competent jurisdiction and the expiration of time to appeal
or the denial of the last right of appeal) that such  indemnification may not be
enforced in such case  notwithstanding the fact that this Agreement provides for
indemnification  in such case, then the Indemnifying  Party and such Indemnified
Party will contribute to the aggregate losses, claims, damages or liabilities to
which they may be subject (after contribution from others) in such proportion as
is appropriate to reflect the relative  fault of the  Indemnifying  Party on the
one  hand and of the  Indemnified  Party on the  other  in  connection  with the
statements  or  omissions  which  resulted in such  losses,  claims,  damages or
liabilities,  as  well  as any  other  relevant  equitable  considerations.  The
relative fault of the Indemnifying  Party on the one hand and of the Indemnified
Party on the other shall be  determined  by reference  to,  among other  things,
whether the untrue or alleged untrue statement of a material fact or omission or
alleged omission to state a material fact relates to information supplied by the
Indemnifying  Party on the one hand and of the  Indemnified  Party on the other,
and  each  party's  relative  intent,  knowledge,   access  to  information  and
opportunity to correct or prevent such statement or omission; provided, however,
that, in any such case, no person guilty of fraudulent misrepresentation (within
the  meaning  of  Section  11(f) of the  Securities  Act)  will be  entitled  to
contribution   from  any  person   who  was  not   guilty  of  such   fraudulent
misrepresentation.

      2.6 Exchange Act Registration. As long as META is subject to the reporting
requirements  of either  Section 13 or Section  15(d) of the Exchange  Act, META
will use commercially reasonable efforts to timely file with the Commission such
information  as the  Commission  may require under either  Section 13 or Section
15(d) of the Exchange Act and shall use commercially  reasonable efforts to take
all action as may be  required as a condition  to the  availability  of Rule 144
under the Securities  Act (or any successor  exemptive rule hereafter in effect)
with respect to the Registrable  Shares.  META shall furnish to the Stockholders
forthwith upon request (i) a written statement by META as to its compliance with
the reporting requirements of Rule 144, (ii) a copy of the most recent annual or
quarterly  report of META as filed  with the  Commission,  and (iii)  such other
reports and documents as a Stockholder may reasonably request in availing itself
of any rule or regulation of the  Commission  allowing such  Stockholder to sell
any such  Registrable  Shares  pursuant to Rule 144 without  registration.  META
shall use commercially  reasonable  efforts to facilitate and expedite transfers
of the  Registrable  Shares pursuant to Rule 144 under the Securities Act, which
efforts  shall  include  prompt  notice to its transfer  agent to expedite  such
transfers of Registrable Shares.

      2.7 Further Obligations of META. META shall also do the following:

            (a) Notify the Stockholders  promptly upon the  effectiveness of the
Resale Registration  Statement.  Furnish to each Stockholder such copies of each
preliminary and final  prospectus and such other  documents as such  Stockholder
may  reasonably  request to facilitate  the public  offering of its  Registrable
Shares;

            (b) Use commercially  reasonable  efforts to register or qualify the
shares covered by said registration statement under the applicable securities or
Blue Sky laws of such  jurisdictions  as any selling  Stockholder may reasonably
request;  provided,  however,  that META shall not be obligated to qualify to do
<PAGE>

business in any  jurisdictions  where it is not then so qualified or to take any
action  which  would  subject it to the  service of process in suits  other than
those  arising  out of the  offer  or  sale  of the  securities  covered  by the
registration statement in any jurisdiction where it is not then so subject; and

            (c) Furnish, upon request, to each selling Stockholder a copy of all
documents  filed  with  and  all  correspondence  from or to the  Commission  in
connection with any such offering of the Registrable Shares.

      2.8  Further   Obligations  of   Stockholders.   In  connection  with  any
registration  pursuant to this Agreement in which  Registrable  Shares held by a
Stockholder  are to be  registered,  such  Stockholder  shall furnish to META in
writing  such  information  with  respect  to such  Stockholder  and the sale or
distribution proposed by such Stockholder as META requests for use in connection
with any such  registration  statement  or  prospectus  or otherwise as shall be
required  in  connection  with any  registration,  qualification  or  compliance
referred to in this  Agreement.  Such  provision of  information  is a condition
precedent to the obligations of META pursuant to this Agreement.

      2.9  Allocation  of  Expenses.  META  shall  pay  all of the  Registration
Expenses incurred by META in complying with Section 2.1 of this Agreement. In no
event shall META have any obligation to pay or otherwise bear any portion of the
underwriters'  commissions  or discounts and selling  concessions,  any fees and
expenses of counsel to the Stockholders,  if any, or stock transfer, issuance or
other tax  attributable to the Registrable  Shares being offered and sold by any
of the Stockholders.

      2.10 Selection of Broker.  The Registrable  Shares registered  pursuant to
this Agreement shall be sold by the selling  Stockholders  through one broker or
dealer selected by META at the time of such registration.

      2.11 "Lock-Up" Agreement. If META proposes to offer for sale to the public
any of its equity securities, and (i) if requested by META and an underwriter of
shares of Common Stock or other  securities of META and (ii) if all "affiliates"
are  requested  by META and such  underwriter  to sign a lock-up  agreement  (as
described below),  then such Stockholder shall not offer, sell, grant any option
or right to buy or sell,  or otherwise  transfer or dispose of in any manner any
Common Stock or other  securities  of META held by it during the 180-day  period
following the effective date of the  registration  statement of META filed under
the  Securities  Act and will sign a "lock-up  agreement"  to such effect.  Such
agreement shall be in writing and in form and substance reasonably  satisfactory
to META and such  underwriter and pursuant to customary and prevailing terms and
conditions.  META may  impose  stop-transfer  instructions  with  respect to the
securities  subject to the foregoing  restrictions until the end of such 180-day
period.

      2.12 Sale or Transfer of Shares.  (a) The Registrable  Shares shall not be
sold or transferred  unless either (i) they shall have been registered under the
Securities  Act, or (ii) META shall have been furnished with an opinion of legal
counsel,  satisfactory  to META,  to the effect  that such sale or  transfer  is
exempt from the registration requirements of the Securities Act.

            (b) Each certificate  representing  Registrable  Shares shall bear a
legend substantially in the following form:

            THE SHARES  REPRESENTED BY THIS  CERTIFICATE  HAVE NOT BEEN
            REGISTERED UNDER THE SECURITIES  ACT OF 1933, AS AMENDED,AND
            MAY NOT BE OFFERED,  SOLD OR OTHERWISE TRANSFERRED, PLEDGED 
<PAGE>
            OR HYPOTHECATED UNLESS AND UNTIL SUCH SHARES ARE REGISTERED
            UNDER SUCH ACT OR AN OPINION OF COUNSEL  SATISFACTORY TO THE
            COMPANY IS OBTAINED TO THE EFFECT THAT SUCH REGISTRATION IS 
            NOT REQUIRED.

      2.13  Transferability.  The registration  rights granted in this Agreement
may be assigned or transferred in connection  with a sale of Registrable  Shares
or  otherwise  if (a) such  person (i) is a partner of a  Stockholder  that is a
partnership  and such  Registrable  Shares  were  received by such person upon a
distribution  to such partner,  (ii) is a transferee of a Stockholder by will or
the  laws  of  descent  and  distribution,  (iii)  is a  spouse  or  child  of a
Stockholder,  or a trust of which a Stockholder or his or her spouse or child is
the beneficiary and (iv) is a beneficiary of a trust of which a Stockholder is a
or the  trustee  and (b)  such  person  notifies  META of such  distribution  in
writing,  provides  META  with his or her name and  address  and the  number  of
Registrable  Shares  acquired,  and  agrees in  writing  (in form and  substance
satisfactory to META) to be bound by the terms and conditions of this Agreement.
Except as provided in the previous sentence,  the registration rights granted in
this Agreement may not be assigned or  transferred in connection  with a sale of
the Registrable Shares or otherwise. Nothing herein shall be construed to modify
a Stockholder's  obligation  under the  Participation  Agreement  signed by such
Stockholder pursuant to the Merger Agreement.


                                 ARTICLE III

                                MISCELLANEOUS

      3.1 Termination. The registration rights set forth in this Agreement shall
terminate on the first anniversary of the Effective Time.

      3.2 Law Governing.  This Agreement  shall be governed by and construed and
enforced  in  accordance  with the laws of the  Commonwealth  of  Massachusetts,
without giving effect to the principles of conflicts of law thereof.

      3.3 Amendment;  Waiver.  This Agreement may be amended,  and any provision
hereof may be waived, only with the written consent of META and the holders of a
majority of the then outstanding Registrable Shares.

      3.4 Headings and Interpretation.  The headings contained in this Agreement
are  for   reference   purposes  only  and  shall  not  affect  the  meaning  or
interpretation   of  this   Agreement.   Terms  such  as   "herein",   "hereof",
"hereinafter" refer to this Agreement in which they appear as a whole and not to
the  particular  sentence or  paragraph  where they  appear,  unless the context
otherwise requires. Unless the context otherwise requires, (i) terms used in the
plural  include the  singular,  and vice versa,  and (ii) words in the masculine
gender include the feminine and neuter, and vice versa.

      3.5 Notices.  All notices,  consents and other  communications  under this
Agreement shall be in writing and shall, except as otherwise provided herein, be
deemed to have been duly given when (i) delivered by hand, (ii) sent by telex or
telecopier (with receipt confirmed), provided that a copy is mailed by certified
mail, return receipt requested, or (iii) when received by the addressee, if sent
by Express Mail,  Federal  Express or other express  delivery  service  (receipt
requested),  in each case,  at the  appropriate  addresses,  telex  numbers  and
telecopier numbers as set forth below (or to such other addresses, telex numbers
and  telecopier  numbers as a party may  designate as to itself by notice to the
other parties):

      If to META:

            208 Harbor Drive
            Stamford, CT  06912-0061
            Attention:  Chief Financial Officer

      with a copy to:

            Testa, Hurwitz & Thibeault, LLP
            High Street Tower
            125 High Street
            Boston, MA 02110
            Attention:  Mark J. Macenka, Esq.

      If to a Stockholder:

            At their respective addresses as reflected in the books
            and records of META or its transfer agent

      3.6  Invalidity of Provisions.  Each of the  provisions  contained in this
Agreement  is  distinct  and  severable  and  a  declaration  of  invalidity  or
unenforceability  of any such  provision or part thereof by a court of competent
jurisdiction  shall not  affect  the  validity  or  enforceability  of any other
provision hereof or thereof.

      3.7  Counterparts; Facsimile Signatures. This  Agreement may be executed
simultaneously in one or more counterparts,  each of which shall be deemed to be
an  original  but all of  which  together  shall  constitute  one  and the  same
instrument.  Any holder of Registrable Shares (other than the Stockholders) may,
after the date hereof,  become a "Stockholder"  for all purposes  hereunder upon
execution of a counterpart to this Agreement. For the purposes of executing this
Agreement,  (a) a  document  signed  and  transmitted  by  facsimile  machine or
telecopier  shall be treated as an original  document;  (b) the signature of any
party on such document  shall be considered  as an original  signature;  (c) the
document transmitted (or the document of which the page containing the signature
or signatures of one of more parties is transmitted)  shall have the same effect
as a counterpart thereof containing original signatures;  and (d) at the request
of a party,  each party who executed a document and transmitted such document by
facsimile  machine or  telecopier,  shall provide such original  document to the
other  party.  No  party  may  raise as a  defense  to the  enforcement  of this
Agreement or any other document  required to be delivered in accordance with its
terms,  including any amendment thereof,  that a facsimile machine or telecopier
was  used to  transmit  a  signature  of that  party  or  another  party  on the
Agreement, other document, or amendment.

                 [Remainder of Page Intentionally Left Blank]
<PAGE>



      IN WITNESS WHEREOF, this Agreement has been duly executed and delivered by
the parties on the date first above written.


                                META GROUP, INC.


                                    By:/s/Bernard F. Denoyer
                                       ---------------------------------- 
                                    Name:  Bernard F. Denoyer
                                    Title: CFO, SVP-Finance, Secretary and
                                           Treasurer

                                    STOCKHOLDERS:


                                    /s/Paul M. Beals
                                    ------------------------------------
                                    Paul M. Beals

                                    Address:
                                    1174 Hurst Park Court
                                    Lawrenceville, GA 30243


                                    ------------------------------------
                                    David R. Brousell

                                    Address:
                                    2 Jefferson Way
                                    Medfield, MA 02052


                                    /s/Robert H. Cawly
                                    -------------------------------------
                                    Robert H. Cawly

                                    Address:
                                    35 Flagg Road
                                    Southborough, MA 01772


                                    /s/Patricia A. Cawly
                                    --------------------------------------
                                    Patricia A. Cawly

                                    Address:
                                    35 Flagg Road
                                    Southborough, MA 01772
<PAGE>


                                    THE ROBERT DEN. COPE 1995 TRUST, NEW
                                    LONDON TRUST FSB AND JOHN F. SHORO,
                                    TRUSTEES



                                    By:/s/Gerald Milkowski
                                    -------------------------------------- 
                                    Its: Trustee

                                    Address:
                                    c/o New London Trust FSB
                                    80 South Main Street
                                    Hanover, NH 03755


                                    /s/Kathleen M. Flynn (O'Keefe)
                                    --------------------------------------
                                    Kathleen M. Flynn (O'Keefe)

                                    Address:
                                    69 Hunter Avenue
                                    Hudson, MA 01749


                                    /s/Carol G. Gannon
                                    --------------------------------------
                                    Carol G. Gannon

                                    Address:
                                    74 Brook Street
                                    Franklin, MA 02038


                                    /s/Damon P. Gannon
                                    --------------------------------------
                                    Damon P. Gannon

                                    Address:
                                    c/o William A. Gannon, Sr.
                                    74 Brook Street
                                    Franklin, MA 02038



                                    /s/William A. Gannon, Jr.
                                    ---------------------------------------
                                    William A. Gannon, Jr.

                                    Address:
                                    9 Arrowhead Lane
                                    Franklin, MA 02038
<PAGE>


                                    /s/William A. Gannon, Sr.
                                    -------------------------------------
                                    William A. Gannon, Sr.

                                    Address:
                                    74 Brook Street
                                    Franklin, MA 02038


                                    /s/John B. Hartman
                                    ------------------------------------
                                    John B. Hartman

                                    Address:
                                    1295 Midland Way
                                    Lawrenceville, GA 30243


                                    /s/Thomas B. Hickey
                                    --------------------------------------
                                    Thomas B. Hickey

                                    Address:
                                    266 Weston Road
                                    Wellesley, MA 02181


                                    /s/William D. Hoffman
                                    -------------------------------------
                                    William D. Hoffman

                                    Address:
                                    1349 Garrick Way
                                    Marietta, GA 30068


                                    /s/Robert D. Kelley
                                    ------------------------------------
                                    Robert D. Kelley

                                    Address:
                                    7850 North Spalding Lake Road
                                    Atlanta, GA 30350


                                    ------------------------------------
                                    William J. McMillan

                                    Address:
                                    120 Cross Street
                                    Winchester, MA 01890
<PAGE>

                                    /s/Philip J. Morrison
                                    -------------------------------------
                                    Philip J. Morrison

                                    Address:
                                    1015 Park Meadow Lane
                                    Roswell, GA 30076



                                    /s/Kirk K. Reiss
                                    --------------------------------------
                                    Kirk K. Reiss

                                    Address:
                                    1085 Marka Lane
                                    Alpharetta, GA 30201



                                    SAFEGUARD SCIENTIFICS (DELAWARE), INC.


                                    By:/s/James A. Ounsworth
                                       ------------------------------------
                                    Its:Vice President

                                    Address:
                                    103 Springer Building
                                    3411 Silverside Road
                                    P.O. Box 7048
                                    Wilmington, DE 19803



                                    /s/Carl G. Sempier
                                    ---------------------------------------
                                    Carl G. Sempier

                                    Address:
                                    3 Roselawn Lane
                                    Malvern, PA 19355


                                    /s/Anthony W. Stein
                                    ---------------------------------------
                                    Anthony W. Stein

                                    Address:
                                    205 Quiet Stream Court
                                    Roswell, GA 30075-1872


                                    /s/Michael P. Walsh
                                    ---------------------------------------
                                    Michael P. Walsh

                                    Address:
                                    60 Langley Road
                                    Brighton, MA 02135



                                            *
                                    _____________________________________
                                    Donald R. Caldwell

                                    Address:
                                    531 North Rose Lane
                                    Haverford, PA 19041



                                            *
                                    ______________________________________
                                    Charles A. Root

                                    Address:
                                    1361 South Leopard Road
                                    Berwyn, PA 19312



                                           *
                                    _______________________________________
                                    Delbert W. Johnson

                                    Address:
                                    1359 Colleen Avenue
                                    Arden Hills, MN 55112



                                           *
                                    ________________________________________
                                    James A. Ounsworth

                                    Address:
                                    7721 St. Martins Lane
                                    Philadelphia, PA 19118



                                           *
                                    _______________________________________
                                    Gerald M. Wilk

                                    Address:
                                    11 Pickwick Lane
                                    Malvern, PA 19355



                                          *
                                    _______________________________________
                                    Walter W. Buckley

                                    Address:
                                    428 Glenwyth Road
                                    Strafford, PA 19087



                                          *
                                    _______________________________________
                                    Michael W. Miles

                                    Address:
                                    1333 Argyle Road
                                    Berwyn, PA 19312



                                    /s/Glenn T. Rieger
                                    ----------------------------------------
                                    Glenn T. Rieger

                                    Address:
                                    2 Forest Road
                                    Wayne, PA 19087



                                           *
                                    ______________________________________
                                    Jerry L. Johnson

                                    Address:
                                    1075 Green Valley Road
                                    Bryn Mawr, PA 19010


                                           
                                           *
                                    _____________________________________
                                    Thomas C. Lynch

                                    Address:
                                    1236 Denbigh Lane
                                    Radnor PA 19087



                                          *
                                    ______________________________________
                                    Steven J. Rosard

                                    Address:
                                    12 Penarth Road
                                    Bala Cynwyd, PA 19004

<PAGE>


                                    */s/Glenn T. Rieger
                                    _____________________________________
                                    By Glenn T. Rieger,
                                    Attorney-in-Fact



                          

                               ESCROW AGREEMENT


      ESCROW  AGREEMENT  dated as of October 20, 1998 among META Group,  Inc., a
Delaware    corporation    ("META"),    Peter   A.   Naber   (the   "Stockholder
Representative"),  as  representative  of stockholders of The Sentry Group, Inc.
listed on Exhibit A hereto (the  "Stockholders")  and the other  stockholders of
The Sentry Group, Inc., and State Street Bank and Trust Company, as escrow agent
(the "Escrow Agent").

                                   RECITALS

      1. META and its wholly-owned  subsidiary,  MG Acquisition  Corporation,  a
Massachusetts  corporation  ("Merger Sub"), have executed a definitive Agreement
and Plan of Merger dated as of September 23, 1998 (the "Merger  Agreement") with
The Sentry Group,  Inc., a  Massachusetts  corporation  ("SENTRY"),  pursuant to
which  Merger  Sub  will  merge  with  and  into  SENTRY  (the  "Merger").   The
stockholders  of  SENTRY   (including  the   Stockholders)   have  selected  the
Stockholder Representative to act on their behalf in connection with the Merger,
though such stockholders are not a party to, and such  stockholders  (except for
the  Stockholders)  will have no rights under,  this Escrow  Agreement.  Certain
defined  terms used in this  Escrow  Agreement  are defined in Section 6 of this
Escrow Agreement.

      2. The  Escrow  Agent  will  establish  an  escrow  account  (the  "Escrow
Account").

      3.  Pursuant to the Merger  Agreement,  at the Effective  Time,  META will
deliver to the Escrow Agent for deposit in the Escrow  Account  44,965 shares of
META Common (the "Escrow Shares").

      NOW,  THEREFORE,  in  consideration  of the  premises  and other  good and
valuable consideration, the receipt of which is hereby acknowledged, the parties
agree as follows:

      Section 1.  Establishment of Escrow Account.

      (a) Pursuant to Section 1.8 of the Merger Agreement,  simultaneously  with
the Closing,  META will deposit with the Escrow Agent a stock certificate in the
name of the Escrow Agent (or its nominee)  representing the Escrow Shares, to be
held in an  account  designated  as  "META/SENTRY  Escrow  Account"  or having a
similar  designation  and  disbursed in accordance  with the terms  hereof.  The
Escrow Agent agrees to accept the Escrow Shares and to hold and distribute  them
in the manner provided herein. The Escrow Agent shall have no responsibility for
the genuineness, validity, market value or title for any intended purpose of the
Escrow Shares.

      (b) All  dividends  and  distributions  (other  than  cash  dividends  and
distributions)  made by META with  respect to the Escrow  Shares will be paid or
made to the Escrow  Agent to be held in escrow with the other  Escrow  Shares as
provided  herein as additional  assets of the escrow to satisfy  indemnification
claims in accordance with Article IX of the Merger Agreement. Such dividends and
distributions  shall be deemed to be a part of the  Escrow  Shares to which they
relate.  Cash  dividends and  distributions,  if any, with respect to the Escrow
Shares  will be made by META  directly to the  Stockholders  of SENTRY for whose
account such shares are being held hereunder.  If a meeting or written action of
stockholders of META occurs while this Escrow Agreement is still in effect,  the
<PAGE>

Escrow Agent shall promptly send to the Stockholder Representative copies of any
notices,  proxies and proxy  materials which it receives in connection with such
meeting or written  action.  The Escrow  Agent  shall vote the Escrow  Shares in
accordance with the instructions set forth in any proxies returned to the Escrow
Agent by the Stockholder  Representative  and received by the Escrow Agent three
business days prior to the date of any such meeting or written action; provided,
however,  that the Escrow Agent will use reasonable  efforts to vote any proxies
received  thereafter.  If no proxy is received,  the Escrow Agent shall not vote
such shares.

      (c)  Exhibit A hereto  contains  a list of all of the  Stockholders  whose
shares will be held in the Escrow  Account,  their  addresses  and the number of
Escrow  Shares held for their  account  hereunder at the  Effective  Time of the
Merger.  The  number of  Escrow  Shares  held for the  account  of a  particular
Stockholder  as of the date of this  Escrow  Agreement  relative  to the  Escrow
Shares  held for the account of all  Stockholders  as of the date of this Escrow
Agreement   is   referred  to  herein  as  such   Stockholder's   "Proportionate
Percentage." Upon any distribution of Escrow Shares to META in satisfaction of a
Notice of Claim (as  defined  below)  the number of Escrow  Shares  held for the
account of each  Stockholder  will be reduced by its  Proportionate  Percentage,
except for any distribution of Escrow Shares to META in satisfaction of a Notice
of  Claim  that  applies  solely  to a Major  Stockholder  with  respect  to the
Participation  Agreement (as  expressly  set forth in such Notice of Claim),  in
which case such distribution  shall be applied in reduction of the Escrow Shares
held for the account of such Major Stockholder).  In the event that any loss set
forth in a Notice of Claim  becomes due in  accordance  with the  provisions  of
Section 2 hereof and exceeds any Stockholder's remaining number of Escrow Shares
(a "Deficiency"),  then the other  Stockholders shall be obligated to cover such
Deficiency according to each Stockholders' relative Proportionate Percentage.

     (d) As set forth in the Merger Agreement and other materials,  by virtue of
the  Stockholders'  approval of the Merger  Agreement,  the  Stockholders  have,
without any further actions required, consented to: (i) the establishment of the
escrow hereunder to secure the Stockholders'  indemnification  obligations under
Article IX of the Merger  Agreement  in the  manner set forth  herein,  (ii) the
appointment  of the  Stockholder  Representative  as  their  representative  for
purposes of this Escrow Agreement and as  attorney-in-fact  and agent for and on
behalf of each such Stockholder and the taking by the Stockholder Representative
of any and all actions and the making of any decisions  required or permitted to
be taken or made by him under this Escrow  Agreement  and (iii) all of the other
terms, conditions and limitations in this Escrow Agreement.

      Section 2.  Payment by Escrow Agent with Respect to the Escrow Shares.

      (a) (i) If META  reasonably  believes  that it,  or any  other  Indemnitee
entitled to indemnification under Section 9.2 of the Merger Agreement (the "META
Indemnitees")  has or may  suffer a loss  that  entitles  or may  entitle  it to
indemnification under the Merger Agreement, META may deliver to the Escrow Agent
a written  notice (a "Notice of Claim")  setting forth in reasonable  detail the
nature of the claim,  an estimate of the aggregate  amount at that time to which
META believes such META  Indemnitee is, or may be,  entitled to be paid pursuant
to the Merger Agreement, and the amount of Escrow Shares to be delivered to META
in  satisfaction  of such claim  pursuant  to Section  2(e)  hereof.  META shall
deliver a copy of each  Notice  of Claim to the  Stockholder  Representative  no
later than the date on which such  Notice of Claim was  delivered  to the Escrow
Agent.  Each  Notice of Claim  delivered  to the Escrow  Agent  shall  include a
certification  that  META has  delivered  a copy of such  Notice of Claim to the
Stockholder Representative.

            (ii) The Escrow  Agent shall  deliver to META's  transfer  agent (as
identified in Section 4 of this Escrow  Agreement)  (the  "Transfer  Agent") the
stock  certificate  representing the Escrow Shares held in the Escrow Account in
exchange  for a new stock  certificate  representing  a number of shares of META
Common  (which will remain  Escrow  Shares) equal to the number of Escrow Shares
previously  held by the Escrow Agent,  less the number of Escrow Shares having a
value (such value to be determined pursuant to Section 2(e) hereof) equal to the
amount set forth in such Notice of Claim as soon as practicable,  but no earlier
than 20 business  days  following  receipt by the Escrow Agent of such Notice of
Claim.

      Notwithstanding  the  preceding  paragraph,  if  within  the  period of 20
business days following  receipt by the Escrow Agent of such Notice of Claim the
Escrow Agent shall have received from the Stockholder  Representative  a written
notice (a "Dispute  Notice")  stating that he or it disputes the validity or the
amount  specified  in such Notice of Claim or any portion  thereof (a  "Disputed
Amount"), the Escrow Agent shall not deliver the Escrow Shares as provided above
for any such disputed amount other than pursuant to Section 2(b).

      Except as expressly provided in Section 1(c) hereof, upon any distribution
of Escrow  Shares  to META in  satisfaction  of a Notice of Claim by the  Escrow
Agent the number of Escrow Shares held for the account of each  Stockholder will
be reduced by its Proportionate  Percentage of the Escrow Shares  distributed to
satisfy the Notice of Claim,  except that,  with respect to the  distribution of
Escrow Shares to META in  satisfaction  of a Notice of Claim that applies solely
to a Major Stockholder with respect to the Participation Agreement (as specified
in such  Notice of Claim),  the number of Escrow  Shares held for the account of
such  Major  Stockholder  will be  reduced  by such  number of Escrow  Shares so
distributed.  Any  fractional  interests  will  be  carried  forward  until  the
distribution  of Escrow  Shares to the  Stockholders,  at which time  fractional
interests  will be rounded in the  discretion  of META.  Within 10 business days
after any payment of a META  Indemnitee  claim,  including a payment made at the
direction of an arbitration panel pursuant to Section 2(c), META will deliver to
the Escrow Agent and the Stockholder  Representative  a revised Exhibit A, which
will be attached hereto in lieu of the then existing Exhibit A. The Escrow Agent
may  rely  upon  such  revised  Exhibit  A  unless  and  until  the  Stockholder
Representative  delivers an objection thereto in writing to the Escrow Agent and
META. Any disputes  regarding  Exhibit A will be resolved in the manner provided
in Section 2(c) hereof.  Without  altering the Escrow  Agent's  obligations  set
forth  herein,  the  Stockholder  Representative  shall  include in each Dispute
Notice,  reasonable  detail of the  nature of the  Stockholder  Representative's
dispute. The Stockholder Representative shall send a copy of each Dispute Notice
to META no later  than the date on which  such  Dispute  Notice  was sent to the
Escrow Agent.  Each Dispute Notice delivered to the Escrow Agent shall include a
certification  that  the  Stockholder  Representative  has  sent a copy  of such
Dispute Notice to META.

            (iii) If the Escrow Agent shall not have actually received a Dispute
Notice with respect to the validity or amount specified in a Notice of Claim, or
a portion  thereof,  within the period of 20 business days following its receipt
of such Notice of Claim, the Stockholder  Representative shall be forever barred
and precluded from contesting in any manner or forum whatsoever the distribution
of Escrow Shares on account of such amount not so disputed.

      (b) Upon receipt by the Escrow Agent of a notice (a  "Resolution  Notice")
from META  and/or  the  Stockholder  Representative  with  respect to a Disputed
Amount  specifying  the  amount  of such  Disputed  Amount  to  which  any  META
Indemnitee is entitled,  accompanied by (A) a written agreement between META and
the Stockholder  Representative  with respect to such Disputed Amount,  or (B) a
final order from an arbitrator pursuant to Section 2(c) of this Escrow Agreement
determining  that META is entitled to  indemnification,  the Escrow  Agent shall
cause to be delivered to such META  Indemnitee  the Escrow Shares having a value
equal to the amount to which such META Indemnitee,  or any other META Indemnitee
is  entitled,  if any, in each case such Escrow  Share amount to be specified in
such written  agreement or final order, as applicable.  META and the Stockholder
Representative  agree that the only methods for resolving a Disputed Amount will
be through  negotiations  between  themselves  or through  use of an  arbitrator
pursuant to Section 2(c).

      (c) In the event of a Disputed  Amount, a dispute  regarding  revisions to
Exhibit A, or any other dispute  regarding this Escrow  Agreement,  META and the
Stockholder Representative shall in good faith negotiate to settle such dispute.
If no resolution is reached within 30 days after delivery of the Dispute Notice,
a revised  Exhibit A or any other written  dispute notice  regarding this Escrow
Agreement  to the  Escrow  Agent,  either  party  may  commence  an  arbitration
proceeding (a  "Proceeding") by submitting the Disputed Amount or other disputed
matters to arbitration  within 60 days after the date of delivery of the Dispute
Notice,  the revised  Exhibit A or other  written  dispute  notice to the Escrow
Agent. Any such  arbitration  shall be before an arbitral  tribunal  composed of
three  arbitrators;  one  selected  by META,  one  selected  by the  Stockholder
Representative  and  one  selected  by  mutual  agreement  of the  parties  (the
"Panel").  If the  parties  are  unable to agree on such third  arbitrator,  the
arbitrator shall be selected by the American Arbitration Association (the "AAA")
in accordance with its Commercial  Arbitration Rules. The Panel will resolve the
Disputed  Amount  in  accordance  with the  rules of the AAA.  The venue for the
arbitration  shall be Stamford,  Connecticut or such other venue mutually agreed
to by META and the Stockholder Representative.  The Panel's award or order shall
be  final  and  binding  on  META,  the  Stockholder   Representative   and  the
Stockholders and all costs of such proceeding shall be borne as specified in the
award or order.  The  provisions  of this  Section  may be enforced in any court
having  jurisdiction  over the award or any of the  Stockholders and META and or
any of their respective  assets,  and judgment on the award  (including  without
limitation  equitable  remedies)  granted in any  arbitration  hereunder  may be
entered in any such court.  Nothing  contained in this Section shall prevent any
party from  seeking  interim  measures of  protection  in the form of  pre-award
attachment of assets or preliminary or temporary equitable relief.

      (d) (i)  Within 20  business  days  after the First  Termination  Date (as
defined   below),   the  Escrow  Agent  shall  deliver  the  stock   certificate
representing the Escrow Shares to the Transfer Agent in exchange for:

                  (A) stock certificates for and in the name of each Stockholder
      with respect to 2,045 of the Escrow  Shares minus (1) the number of Escrow
      Shares previously  released to META in connection with resolved Notices of
      Claim (without  duplication  with respect to Section  2(d)(ii)) other than
      any  Notices  of Claim made by META  under  Section  9.2(vi) of the Merger
      Agreement,  (2) the number of Escrow Shares previously released to META in
      connection  with  resolved  Notices  of Claim  (without  duplication  with
      respect to Section  2(d)(ii))  made by META under  Section  9.2(vi) of the
      Merger  Agreement  in excess of 42,920,  (3) the  number of Escrow  Shares
      subject to any outstanding and unresolved  Notices of Claim other than any
      outstanding  and  unresolved  Notices of Claim made by META under  Section
      9.2(vi)  of the  Merger  Agreement  and (4) the  number of  Escrow  Shares
<PAGE>

      subject to any  outstanding  and unresolved  Notices of Claim made by META
      under Section 9.2(vi) of the Merger Agreement in excess of 42,920,  in the
      case of each of  subclauses  (1)-(4) of this Section  2(d)(i) based on the
      amounts set forth in the Notice of Claim,  whether or not a Dispute Notice
      has been  delivered  with  respect  thereto,  unless such dispute has been
      subsequently resolved; and

                  (B) a new stock  certificate  in the name of the Escrow  Agent
      representing,  in the  aggregate,  the number of Escrow Shares  determined
      pursuant to Section 2(d)(i)(A)(3), Section 2(d)(i)(A)(4) above and Section
      2(d)(ii)(A)  below.  The "First  Termination  Date" shall mean October 31,
      2000.

      Upon  receipt of such stock  certificates  from the  Transfer  Agent,  the
Escrow Agent will promptly  deliver such stock  certificates for and in the name
of the  Stockholders  in accordance  with Exhibit A to them at such addresses as
the  Stockholder  Representative  shall direct in writing,  and the Escrow Agent
will  retain  the new  stock  certificate  in its name as  provided  in  Section
2(d)(ii) and pending resolution of all outstanding and unresolved claims.

      Within  10  business  days  after the First  Termination  Date,  META will
deliver to the Escrow  Agent and the  Stockholder  Representative  a letter (the
"First  Release  Letter")  confirming  for the  Escrow  Agent  the  name of each
Stockholder,  the number of Escrow  Shares each such  Stockholder  will  receive
pursuant to Section  2(d)(i)(A) above, and the number of Escrow Shares delivered
to the Escrow Agent pursuant to Section  2(d)(i)(B)  above. The Escrow Agent may
rely  upon  the  First  Release   Letter   unless  and  until  the   Stockholder
Representative  delivers an objection thereto in writing to the Escrow Agent and
META. The Escrow Agent shall have no responsibility  for any of the calculations
required by this Section  2(d)(i).  Any  disputes  regarding  the First  Release
Letter will be resolved in the manner provided in Section 2(c) hereof.

            (ii) Within 20 business  days after the Final  Termination  Date (as
defined   below),   the  Escrow  Agent  shall  deliver  the  stock   certificate
representing the Escrow Shares to the Transfer Agent in exchange for:

                  (A) stock certificates for and in the name of each Stockholder
      with  respect  to 42,920 of the  Escrow  Shares  plus the number of Escrow
      Shares   determined   pursuant  to  Section   2(d)(i)(A)(3)   and  Section
      2(d)(i)(A)(4) above) minus the number of Escrow Shares previously released
      to META in connection with resolved  Notices of Claim without  duplication
      with respect to Section 2(d)(i); provided,  however, that the Escrow Agent
      shall  exclude from such number of Escrow Shares a number of Escrow Shares
      equal to the  number of  Escrow  Shares  subject  to any  outstanding  and
      unresolved  Notices of Claim (based on the amounts set forth in the Notice
      of Claim,  whether or not a Dispute Notice has been delivered with respect
      thereto,  unless  such  dispute  has been  subsequently  resolved)  and as
      provided in the Final Release Letter (as hereinafter defined); and

                  (B) if applicable,  a new stock certificate in the name of the
      Escrow Agent  representing  the  aggregate  number of Escrow  Shares as to
      which Notices of Claim are outstanding and not resolved.

      In the event that on the Final  Termination Date all the matters set forth
in any previously delivered Notice of Claim have not been finally resolved, then
<PAGE>

a number of Escrow  Shares shall be withheld  from the  distributions  described
above  in  Sections  2(d)(i)  and (ii) in order  to  provide  for the  remaining
indemnification   obligations  of  the   Stockholders  of  SENTRY.   The  "Final
Termination Date" shall mean April 30, 2001.

      Upon  receipt of such stock  certificates  from the  Transfer  Agent,  the
Escrow Agent will promptly  deliver such stock  certificates for and in the name
of the  Stockholders  in accordance  with Exhibit A to them at such addresses as
the  Stockholder  Representative  shall direct in writing,  and the Escrow Agent
will retain the new stock  certificate  in its name  pending  resolution  of all
outstanding and unresolved claims.

      Within  10  business  days  after the Final  Termination  Date,  META will
deliver to the Escrow  Agent and the  Stockholder  Representative  a letter (the
"Final  Release  Letter")  confirming  for the  Escrow  Agent  the  name of each
Stockholder,  the number of Escrow  Shares each such  Stockholder  will  receive
pursuant to Section 2(d)(ii)(A) above, and, if applicable,  the number of Escrow
Shares delivered to the Escrow Agent pursuant to Section  2(d)(ii)(B) above. The
Escrow  Agent  may rely  upon the  Final  Release  Letter  unless  and until the
Stockholder  Representative  delivers  an  objection  thereto  in writing to the
Escrow Agent and META. The Escrow Agent shall have no responsibility  for any of
the calculations  required by this Section 2(d)(ii).  Any disputes regarding the
Final  Release  Letter will be resolved in the manner  provided in Section  2(c)
hereof.

            (iii) If at any time after the First  Termination  Date with respect
to Section  2(d)(i)(B) or after the Final  Termination Date, as the case may be,
there are  Escrow  Shares in excess of  outstanding  Notices of Claim due to the
resolution  of  such   outstanding   claims  either  META  or  the   Stockholder
Representative may deliver a certificate to that effect to the Escrow Agent with
a copy to the other party,  which  certificate will specify the amount of Escrow
Shares to be  released by the Escrow  Agent.  If no written  objection  has been
delivered  within 10 business days by the other party,  a  distribution  will be
effected, as provided in Section 2(d)(i) or Section 2(d)(ii), as applicable.  If
a written objection has been delivered within such time period,  the controversy
will be  resolved  pursuant to Section  2(c)  hereof.  Notwithstanding  anything
herein to the  contrary,  at any time and from time to time by mutual  agreement
META and the Stockholder Representative may deliver a certificate signed by both
of them to the Escrow Agent, which certificate will specify the amount of Escrow
Shares to be released by the Escrow Agent, directing it to release Escrow Shares
by the distribution method in Section 2(d)(i) and/or Section 2(d)(ii).

      (e) For purposes of this  Section 2, Escrow  Shares shall be valued at the
Final  META  Stock   Price.   The  Escrow  Agent  shall  be  under  no  duty  or
responsibility  with  regard  to the  valuation  of  the  Escrow  Shares  or the
calculation  of the  amounts  of  Escrow  Shares  to be  released  or  delivered
hereunder.

      (f) (i) No Stockholder  will offer,  sell,  assign,  pledge,  hypothecate,
transfer or  otherwise  dispose of any Escrow  Shares  until  released  from the
Escrow Account.

            (ii) META and the Stockholder Representative shall have the right to
inspect  and obtain  copies of the records of the Escrow  Agent upon  reasonable
notice and during  reasonable  business hours and to receive  monthly reports of
the status of the Escrow Shares.
<PAGE>

      Section 3.  Concerning the Escrow Agent.

      (a) The Escrow Agent will have no duties or  obligations  other than those
specifically  set forth in or  contemplated  by this Escrow  Agreement,  each of
which is  ministerial  (and shall not be construed as fiduciary)  and the Escrow
Agent will not be  responsible  for any of the  agreements  referred  to herein,
including the Merger Agreement.

      (b) The Escrow Agent will be fully protected in acting on and relying upon
any written notice, direction,  request, waiver, consent, receipt or other paper
or document which the Escrow Agent in good faith believes to have been signed or
presented by the proper party or parties,  but will not act on oral instructions
alone of any party.

      (c) The Escrow Agent will not be  obligated  to take any action  hereunder
which might in its  reasonable  judgment  involve any  extraordinary  expense or
liability,  unless the payment of such expense or liability is provided for in a
manner satisfactory to the Escrow Agent.

      (d) The Escrow Agent and its directors,  officers or employees will not be
liable for any error of  judgment,  or for any act done or step taken or omitted
by it in good faith or for any mistake in fact or law, or for anything  which it
may do or refrain from doing in connection  with this Escrow  Agreement,  except
for its own gross negligence, willful misconduct or act of bad faith.

      (e) The  Escrow  Agent  may seek the  advice of legal  counsel,  including
in-house counsel, in the event of any dispute or question as to the construction
of any of the provisions of this Escrow Agreement or its duties  hereunder,  and
it will incur no liability and will be fully  protected in respect of any action
taken, omitted or suffered by it in good faith in accordance with the opinion of
such counsel.

      (f) The Escrow Agent will be  compensated on the basis of its regular fees
as set forth on Exhibit B, plus reasonable out-of-pocket expenses, including the
reasonable  fees  and  costs of  attorneys  or  agents  in  connection  with the
preparation of this Escrow Agreement or which it may find necessary to engage in
performing its duties under this Escrow Agreement (the "Escrow Fees") which will
be invoiced to META. META will be responsible for all of such Escrow Fees.

      (g) The  Escrow  Agent  shall  have no  more  or  less  responsibility  or
liability on account of any action or omission of any  book-entry  depository or
subescrow agent employed by the Escrow Agent than any such book-entry depository
or  subescrow  agent has to the Escrow  Agent,  except to the  extent  that such
action or omission of any book-entry depository or subescrow agent was caused by
the Escrow Agent's own gross negligence, bad faith or willful misconduct.

      (h) META and the  Stockholder  Representative  agree to treat  the  Escrow
established  hereunder  either  as (i) a  "grantor  trust"  or (ii) an agency or
custody  arrangement  for  all  tax  purposes,  and  META  and  the  Stockholder
Representative will be responsible for all tax and other filings with respect to
the Escrow Shares. The Escrow Agent shall have no obligation to prepare, sign or
file any  federal,  state or local tax  returns  and shall not be deemed to be a
trustee or  fiduciary  on account of the  foregoing.  Furthermore,  META and the
Stockholder  Representative shall instruct the Escrow Agent in writing as to the
identity of the grantor and the trustee under the grantor trust (if META and the
Stockholder  Representative agree to treat the Escrow established hereunder as a
grantor trust) or as to the principal of the agency or custody  arrangement  (if
META and the Stockholder  Representative  agree to treat the Escrow  established
hereunder as an agency or custody  arrangement),  and with respect to the Escrow
Agent's  responsibility  for withholding  and other taxes,  assessments or other
<PAGE>

governmental  charges,  and shall  instruct the Escrow Agent with respect to any
certifications and governmental reporting that may be required under any laws or
regulations that may be applicable in connection with its acting as Escrow Agent
under this Agreement;  provided however, that such written instructions shall be
reasonably  acceptable to the Escrow Agent.  Except as provided  below,  neither
META,  the  Stockholder  Representative  nor the  Escrow  Agent  shall  have any
liability  to any person on account of taxes,  assessments,  additions  for late
payment, interest,  penalties,  expenses and other governmental charges that may
be assessed or asserted  against META,  the  Stockholder  Representative  or the
Escrow  Agent  in  connection  with or  relating  to any  payment  made or other
activities  performed  under the  terms of this  Agreement,  including,  without
limitation, any liability for the withholding or deduction of (or the failure to
withhold or deduct) the same,  and any  liability  for failure to obtain  proper
certifications  or to report properly to governmental  authorities in connection
with this Agreement,  including costs and expenses  (including  reasonable legal
fees and expenses),  interest and penalties  (individually,  a "Tax Liability").
Notwithstanding  the foregoing,  META shall  indemnify and hold the Escrow Agent
harmless  from any Tax  Liability.  The  Escrow  Agent  hereby  agrees to act in
accordance with the written  instructions  delivered to the Escrow Agent by META
and the  Stockholder  Representative  in accordance  with this Section 3(h); and
notwithstanding  the  foregoing,  if the Escrow  Agent is grossly  negligent  in
failing to comply with such  written  instructions,  the  immediately  preceding
sentence shall not apply to the Escrow Agent,  and the Escrow Agent shall not be
entitled to the limitation on Tax Liability  provided in the fourth  sentence of
this Section 3(h). The Stockholder  Representative  acknowledges and agrees with
META that the  Stockholders  shall  contribute  to the amount paid or payable by
META as a result of any indemnification obligation or other liability (including
reasonable legal fees and expenses) to which META may become subject under or in
connection  with this  Section  3(h) in such  proportion  as is  appropriate  to
reflect,  as between META and the  Stockholders,  the party  responsible for the
payment of any such Tax Liability.

      (i) The  Escrow  Agent  will be,  and  hereby  is,  indemnified  and saved
harmless by META and the Stockholder Representative, jointly and severally, from
all liabilities,  losses,  costs and expenses (including  reasonable  attorneys'
fees and expenses)  which may be incurred by it as a result of or arising out of
this  Escrow  Agreement,   including  its  involvement  in  any  arbitration  or
litigation  arising from performance of its duties under this Escrow  Agreement,
other than  litigation  or  arbitration  resulting  from or with  respect to any
action taken or omitted by the Escrow Agent for which it will have been adjudged
grossly   negligent  or  guilty  of  willful   misconduct  or  bad  faith.  Such
indemnifications  in Sections  3(h) and (i) hereof will survive  termination  of
this Escrow Agreement.

      (j) The Escrow Agent may at any time resign as Escrow  Agent  hereunder by
giving  thirty (30) days prior  written  notice of  resignation  to META and the
Stockholder  Representative.  Prior to the effective date of the  resignation as
specified  in such  notice,  META  will  issue  to the  Escrow  Agent a  written
instruction  authorizing  redelivery  of the  Escrow  Shares  to a bank or trust
company that it selects. Such bank or trust company shall have capital,  surplus
and undivided profits in excess of $100,000,000. If, however, META shall fail to
name a  successor  escrow  agent  within  twenty  (20) days  after the notice of
resignation  from the Escrow  Agent,  the  Stockholder  Representative  shall be
entitled to name such successor  escrow agent.  If no successor  escrow agent is
named by META or the Stockholder Representative, the Escrow Agent may apply to a
court of competent jurisdiction for appointment of a successor escrow agent.
<PAGE>

      (k) If a  controversy  arises  between  one or more of the parties to this
Escrow  Agreement,  as to whether or not the Escrow Agent will distribute any of
the Escrow Shares,  or as to any other matter arising out of or relating to this
Escrow Agreement or the Escrow Shares,  the Escrow Agent will not be required to
determine  the  controversy  and need not make any  distribution  of the  Escrow
Shares but may retain the same  without  liability to any party until the rights
of  the  parties  to  the  dispute  will  have  finally  been  determined  by an
arbitration  panel as provided for in Section  2(c) of this Escrow  Agreement or
until it receives  joint  written  instructions  with  respect  thereto from the
Stockholder Representative and META. If a controversy of the type referred to in
this  Section  3  arises,  the  Escrow  Agent  may,  but  shall be under no duty
whatsoever  to,  request that the parties  commence  arbitration  proceedings as
provided  in Section  2(c) of this Escrow  Agreement  for  determination  of the
controversy, and the parties will promptly comply with such request.

      Section 4.  Miscellaneous Provisions.

      (a) All  notices,  consents  and other  communications  under this  Escrow
Agreement shall be in writing and shall, except as otherwise provided herein, be
deemed to have been duly given when (i) delivered by hand, (ii) sent by telex or
telecopier (with receipt confirmed), provided that a copy is mailed by certified
mail, return receipt requested,  and actually received by the addressee or (iii)
when  received by the  addressee,  if sent by Express Mail,  Federal  Express or
other  express  delivery  service  (receipt  requested),  in each  case,  at the
appropriate addresses, telex numbers and telecopier numbers as set forth below:

      If to Escrow Agent, to:

            State Street Bank & Trust Company
            Corporate Trust Department, 4th Floor
            Two International Place
            Boston, MA  02110
            Attention:  Lynn Palmiter - META/SENTRY Escrow Agreement
            Telephone:  (617) 664-5646
            Telecopier: (617) 664-5374

      If to Transfer Agent, to:

            ChaseMellon Shareholder Services, LLC
            111 Founders Plaza, 11th Floor
            East Hartford, Connecticut  06108
            Attention:  Shareholder Services
            Telephone:  (860) 282-3512
            Telecopier: (860) 528-6472

      If to META, to:

            META Group, Inc.
            208 Harbor Drive
            Stamford, CT  06912-0061
            Attention:  Bernard Denoyer, Chief Financial Officer
            Telephone:  (203) 973-6700
            Telecopier: (203) 359-8066
<PAGE>


      with a copy to:

            Testa, Hurwitz & Thibeault, LLP
            125 High Street
            High Street Tower
            Boston, Massachusetts  02110
            Telephone:  (617) 248-7000
            Telecopier: (617) 248-7100
            Attention:   Mark J. Macenka, Esq.


      If to the Stockholder Representative, to:

            Peter A. Naber
            c/o Safeguard Scientifics, Inc.
            800 The Safeguard Building
            435 Devon Park Drive
            Wayne, PA  19087
            Telephone:  (610) 975-4949
            Telecopier: (610) 995-0325

      with a copy to:

            Robert DeN. Cope
            44 Elm Street
            Suite 503
            Worcester, MA 01609
            Telephone:  (508) 753-2714
            Telecopier: (508) 753-1325

(or to such other addresses, telex numbers and telecopier numbers as a party may
designate as to itself by written notice to the other parties).  Notwithstanding
any  of the  foregoing,  no  notice  or  instructions  to the  Escrow  Agent  or
Stockholder  Representative shall be deemed to have been received by it prior to
actual  receipt,  no notice to the Escrow  Agent or  Stockholder  Representative
shall be deemed  effective  until such receipt by it, and any  computation  of a
time  period  which is to begin  after  receipt of a notice by the Escrow  Agent
shall run from the date of such receipt by it.

      (b) Nothing in this Escrow Agreement shall be construed to limit the right
of  META  or any  other  META  Indemnitee  under  any  provision  of the  Merger
Agreement.

      (c)  This  Escrow  Agreement  shall  be  governed  by,  and  construed  in
accordance  with, the laws (other than the choice or conflicts of laws rules and
provisions)  of the  Commonwealth  of  Massachusetts.  META and the  Stockholder
Representative  hereby  absolutely  and  irrevocably  consent  and submit to the
jurisdiction  of the  courts in the  Commonwealth  of  Massachusetts  and of any
Federal court  located in said  Commonwealth  in connection  with any actions or
proceedings  brought  against them (or each of them) by the Escrow Agent arising
out of or relating to this Escrow  Agreement.  In any such action or proceeding,
META and the Stockholder  Representative  hereby  absolutely and irrevocably (i)
waive any objection to jurisdiction or venue, (ii) waive personal service of any
<PAGE>

summons,  complaint,  declaration  or other  process,  and (iii)  agree that the
service thereof may be made by certified or registered first-class mail directed
to such party, as the case may be, at their  respective  addresses in accordance
with Section 4(a) hereof.

      (d) This Escrow  Agreement may be executed in any number of  counterparts,
each of which  shall be deemed  to be an  original  instrument  and all of which
together shall constitute a single agreement.

      (e) Neither META nor the Stockholders  Representative nor the Escrow Agent
shall be responsible  for delays or failures in performance  resulting from acts
beyond its control.  Such acts shall  include but not be limited to acts of God,
strikes,  lockouts,  riots,  acts of war,  epidemics,  governmental  regulations
superimposed  after  the  fact,  fire,  communication  line  failures,  computer
viruses, power failures, earthquakes or other disasters.

      (f) This Escrow  Agreement  shall be binding upon the  respective  parties
hereto and their heirs, executors, successors and assigns.

      (g) This  Escrow  Agreement  may not be altered or  modified  without  the
express written consent of META, the Stockholder  Representative  and the Escrow
Agent.  No course or conduct  shall  constitute a waiver of any of the terms and
conditions of this Escrow Agreement, unless such waiver is specified in writing,
and then  only to the  extent  so  specified.  A waiver  of any of the terms and
conditions  of this Escrow  Agreement  on one  occasion  shall not  constitute a
waiver  of the  other  terms of this  Escrow  Agreement,  or of such  terms  and
conditions on any other occasion.

      (h) This Escrow Agreement and all documents  relating thereto,  including,
without limitation,  (i) consents, waivers and modifications which may hereafter
be executed,  and (b) certificates and other information previously or hereafter
furnished, may be reproduced by an photographic, photostatic, microfilm, optical
disk,  micro-card,  miniature photographic or other similar process. The parties
agree that any such reproduction shall be admissible in evidence as the original
itself in any  proceeding,  whether  or not the  original  is in  existence  and
whether or not such  reproduction  was made by a party in the regular  course of
business, and that any enlargement,  facsimile,  or further reproduction of such
reproduction shall likewise be admissible in evidence.

      Section 5.  The Stockholder Representative.

      (a) As long as there are Escrow  Shares  held in escrow  pursuant  to this
Escrow Agreement, the Stockholders, and each of them, will be represented by the
Stockholder  Representative,  who is  empowered to receive any notice under this
Escrow Agreement for the Stockholders, and each of them, and to give any and all
notices  and  instructions  and take any and all action for and on behalf of the
Stockholders,  and each of them, under this Escrow  Agreement.  The Stockholders
will have the right to remove  the  Stockholder  Representative  and,  upon such
removal  or,  in  the  event  of  the  Stockholder   Representative's  death  or
resignation,  to  appoint  as the  new  Stockholder  Representative  any  former
stockholder  of SENTRY at any time and from time to time  during the period when
any shares are held in escrow, by a vote of at least three Stockholders  holding
in the aggregate a majority interest in the Escrow Shares held in escrow at such
time evidenced by a writing executed by such Stockholders.  The appointment of a
new  Stockholder  Representative  will be of no force or effect  whatsoever upon
META or the Escrow Agent or otherwise  under this Escrow  Agreement  until three
days after the date when both META and the Escrow  Agent have  received  written
<PAGE>

notice of such appointment, which notice must include at least: (i) the identity
and address of the new  Stockholder  Representative  and a  statement  that such
Stockholder  Representative  has  been  appointed  by a vote of at  least  three
Stockholders  holding in the aggregate a majority  interest in the Escrow Shares
then  held in  escrow;  (ii) the  duly  acknowledged  signatures  of each of the
Stockholders  voting for the new  Stockholder  Representative;(iii)  a statement
that any non-signing Stockholder has been notified in writing of the appointment
of  the  new  Stockholder  Representative  and  (iv)  a  statement  by  the  new
Stockholder  Representative  that it agrees to accept  and assume its duties and
obligations   under  this  Escrow  Agreement,   including  any   indemnification
obligations.  META and the Escrow  Agent will be  entitled to rely on any notice
received  in such form  without  conducting  an  investigation  of the  contents
thereof.  Any notice given to the  Stockholder  Representative  will  constitute
notice to each and all of the  Stockholders  at the time  notice is given to the
Stockholder  Representative.  Any  action  taken by,  or  notice or  instruction
received from, the Stockholder Representative will be deemed to be action by, or
notice or instruction from, each and all of the  Stockholders.  META may and the
Escrow  Agent  will  disregard  any  notice  or  instruction  received  from any
Stockholder other than the then acting Stockholder Representative with regard to
this Escrow Agreement.

      (b) The Stockholder  Representative shall not suffer any liability or loss
for any act  performed  or omitted  to be  performed  by him under  this  Escrow
Agreement  in the  absence  of  gross  negligence  or  willful  misconduct.  The
Stockholder  Representative  may consult  with  counsel in  connection  with his
duties  hereunder  and  shall be fully  protected  by any act  taken,  suffered,
permitted,  or omitted in good faith in  accordance  with the advice of counsel.
The Stockholder  Representative  shall not be responsible for the sufficiency or
accuracy  of the form,  execution,  validity  or  genuineness  of  documents  or
securities now or hereafter deposited  hereunder,  or of any endorsement thereof
or for any lack of endorsement thereof or for any description therein, nor shall
he be responsible or liable in any respect on account of the identity, authority
or rights of the persons  executing or  delivering  or  purporting to execute or
deliver  any  such  document,  security  or  endorsement,  and  the  Stockholder
Representative  shall be fully  protected  in relying  upon any  written  notice
demand, certificate or document which he in good faith believes to be genuine.

      (c) The Stockholder  Representative shall be entitled to employ such legal
counsel and other  experts as he may deem  necessary to advise him properly with
respect to his rights and  obligations  hereunder and to evaluate  claims and to
pursue  challenges to claims or to defend third party  claims.  The expenses and
fees of such  counsel  and  experts,  and any out of pocket  expenses  which the
Stockholder Representative incurs under Sections 2 or 3 hereunder in relation to
evaluating,  challenging  or  contesting  claims,  shall  be  reimbursed  by the
Stockholders in accordance with the Proportionate Percentages.

      (d) The  Stockholder  Representative  hereby  agrees to do such acts,  and
execute further documents,  as shall be necessary to carry out the provisions of
this Escrow  Agreement  or to transfer any Escrow  Shares  pursuant to the terms
hereof.

      Section 6.  Certain Defined Terms.  For purposes of this Escrow
Agreement, the following terms shall have the meanings set forth below:

      (a) "Effective Time" means the time of filing of the executed  articles of
merger to effectuate  the Merger with the Secretary of the  Commonwealth  of the
Commonwealth  of  Massachusetts  pursuant  to  Section  78 of the  Massachusetts
Business Corporation Law.
<PAGE>


      (b) "Final  META Stock  Price"  means the  average  closing  price of META
Common  (rounded to the nearest  penny) for the five (5) trading  days ending on
and including the second-to-last trading day which immediately precedes the date
on which a payment is made pursuant to Section 9.5 of the Merger  Agreement or a
valuation  is made of Escrow  Shares for any other  reason  provided  for in the
Merger  Agreement,  as the case may be, in each case  calculated on the basis of
the last reported sales price of META Common on the Nasdaq National Market,  and
as certified to the Escrow Agent in the First Release Letter,  the Final Release
Letter or Notice of Claim.

      (c)  "Indemnitee"  means  each  of  META  and  its  officers,   directors,
shareholders  and  employees  and,  effective at and as of the  Effective  Time,
without  duplication,  Sentry (as the surviving  corporation)  and its officers,
directors,  shareholders and employees and each of their respective subsidiaries
and affiliates.

      (d) "Major  Stockholders" means Safeguard  Scientifics  (Delaware),  Inc.,
William A. Gannon,  Sr.,  Robert H. Cawly,  Kirk K. Reiss,  Donald R.  Caldwell,
Charles A. Root, Delbert W. Johnson, James A. Ounsworth,  Gerald M. Wilk, Walter
W. Buckley, Michael W. Miles, Glenn T. Rieger, Jerry L. Johnson, Thomas C.
Lynch, Steven J. Rosard and Carl G. Sempier.

      (e) "META Common" means shares of Common Stock,  par value $.01 per share,
of META.

      (f) "Participation  Agreement" means that certain Participation  Agreement
dated as of September 23, 1998, by and between META and the Major Stockholders.

                 [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]
<PAGE>


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


                                    STATE STREET BANK AND TRUST COMPANY,
                                    as Escrow Agent


                                    By:/s/E. Decker Adams
                                       -----------------------------------
                                    Name: E. Decker Adams
                                    Title:


                                    META GROUP, INC.


                                    By:/s/ Bernard F. Denoyer
                                       ------------------------------------
                                    Name: Bernard F. Denoyer
                                    Title:CFO, SVP-Finance, Secretary and
                                          Treasurer



                                    By:/s/Peter A. Naber
                                    ---------------------------------
                                    Peter A. Naber, as Stockholder
                                    Representative
<PAGE>


                                  Exhibit A
                                  ---------

Stockholders                      Escrow Shares      Proportionate Percentage
- ------------                      -------------      -----------------------
Gannon, Carol G.                       2,028                4.510%
74 Brook Street
Franklin, MA  02038

Gannon, Damon P.                       1,521                3.383
c/o William A. Gannon, Sr.
74 Brook Street
Franklin, MA  02038

Gannon, William A. Sr.                 8,112               18.041
74 Brook Street
Franklin, MA  02038

McMillan, William J.                   2,293                5.100
120 Cross Street
Winchester, MA  01890

Safeguard Scientifics                 27,349               60.822
(Delaware), Inc.
103 Springer Building
3411 Silverside Road
P.O. Box 7048
Wilmington, DE  19803

Sempier, Carl G.                       1,691                3.761
3 Roselawn Lane
Malvern, PA  19355

Caldwell, Donald R.                      314                0.698
531 North Rose Lane
Haverford, PA 19041

Root, Charles A.                         314                0.698
602 Dundee Drive
Wilmington, NC 28405
<PAGE>

 Stockholders                        Escrow Shares     Proportionate Percentage
 ------------                        -------------     ------------------------

Johnson, Delbert W.                      101                0.225
8325 Via Del Sole Drive East
Scottsdale, AZ 85255

Ounsworth, James A.                      233                0.518
7721 St. Martins Lane
Philadelphia, PA 19118

Wilk, Gerald M.                          233                0.518
11 Pickwick Lane
Malvern, PA 19355

Buckley, Walter W.                        53                0.118
428 Glenwyth Road
Strafford, PA 19087

Miles, Michael W.                        174                0.387
1333 Argyle Road
Berwyn, PA 19312

Rieger, Glenn T.                         174                0.387
201 Wyndom Lane
Radnor, PA 19087

Johnson, Jerry L.                        152                0.338
1075 Green Valley Road
Bryn Mawr, PA 19010

Lynch, Thomas C.                         152                0.338
1236 Denbigh Lane
Radnor, PA 19087
Rosard, Steven J.                         71                0.158
412 Academy Circle
Merion, PA 19066
                                  --------------------------------------

                    Totals:           44,965              100.000%





<PAGE>

                                       News Release

 FOR IMMEDIATE  RELEASE                Contact:  Bernard F. Denoyer
                                                 Investor Relations/CFO
                                                 (203)973-6813
                                                 [email protected]

                                                 Suzanne  Novak
                                                 Director,  Marketing
                                                 Communications 
                                                 (203) 973-6938
                                                 [email protected]

                  META Group Acquires The Sentry Group, Inc.

STAMFORD, CT, October 21, 1998 -- META Group, Inc. (NASDAQ:METG),  a leading
independent provider of information technology (IT) advisory,  publication,  and
consulting  services,  announced today it has completed the previously announced
acquisition  of all  capital  stock of The Sentry  Group,  Inc.,  for an initial
payment of 195,066 shares of META Group common stock and a contingent payment of
up to $7.0  million  in  stock or cash (at META  Group's  option)  in the  event
certain  financial  targets  are met by  Sentry  for the 1999  fiscal  year.  In
addition,  META Group issued to Sentry  stockholders  warrants to purchase up to
200,000 shares of META Group common stock at $30.00 per share, 125,000 shares of
which are currently  exercisable  and 75,000  shares of which are  contingent on
Sentry achieving certain financial targets in fiscal year 1999. This acquisition
will be  accounted  for as a purchase  and META  Group  management  expects  the
acquisition  to  be  slightly  accretive  to  earnings  in  fiscal  1999.  It is
anticipated that 150,101 shares of the initial payment of 195,066 shares will be
registered  by  META  Group  pursuant  to the  terms  of a  registration  rights
agreement.

     Sentry, headquartered in Westborough,  Massachusetts, helps companies
resolve  the  critical  problems  of  widespread  inefficiency  often  found  in
outsourcing and the lost business value from  unrealized IT investments.  Sentry
has worked  with  various  Global  2000  companies,  including  Marriott,  Emery
Worldwide, and Georgia-Pacific. Sentry became a partnership company of Safeguard
Scientifics,  Inc.,  (NYSE:SFE) in 1996,  when it was created from the merger of
Value  Sourcing  Group and Sentry  Technology  Group.

     "The Sentry  acquisition  continues to evolve META Group's service offering
toward  a  rapidly  growing  sector  of the  market,  which  is  demanding  more
definitive  value base  services.  Sentry's  strong  business  value  consulting
methodology  extends and complements META Group  Consulting's IT  subject-matter
expertise,  and increases our addressable market on the consultative side of the
spectrum," said Dale Kutnick,  president,  CEO and co-research  director of META
Group. 
                                    -- More --
<PAGE> 2

     "We look at this as an excellent  investment  opportunity  -- to take our
 original  investment  in Sentry and turn it into an  investment in META
Group,  a successful  public  company,  which we believe is well  positioned  to
capitalize on the Sentry value proposition," said Warren V. Musser, chairman and
CEO of Safeguard Scientifics,  Inc., and Sentry's largest shareholder before the
acquisition  by META  Group. 

About META Group

     META Group helps  companies make better IT decisions by providing  research
and unlimited  analyst  consultation  relevant to their specific business needs.
Offering advisory services, consulting/ benchmarking, and publications that span
the full spectrum of IT, META Group addresses the latest technologies,  industry
trends,  and  business  challenges.   With  more  than  1,600  client  companies
worldwide,  META Group  differentiates  itself from other information  providers
through  its  commitment  to highly  personal  service  (enabling  "analysis  in
context"),  bottom-line answers, and objectivity.  To support this promise, META
Group  maintains  a  client-to-analyst  ratio of 50:1 -- among the  lowest in
the industry -- and reinvests almost 50% of its revenue back into research and 
client services. For details, connect with www.metagroup.com.

     Statements   above  that  are  not  historical   facts  may  be  considered
forward-looking statements that involve risks and uncertainties.  Actual results
could differ materially as a result of a variety of factors, including the level
and timing of renewals of  subscription to Continuous  Services;  the timing and
amount  of  business  generated  by  META  Group;  the  mix of  domestic  versus
international business; the timing of the development,  introduction, marketing,
and market acceptance of new products and services;  the timing of the hiring of
research  analysts;  changes in the  spending  patterns of the META Group target
clients;  changes  in  the  market  demand  for IT  research  and  analysis  and
competitive conditions in the industry; as well as other risks and uncertainties
detailed  from time to time in the META Group  filings with the  Securities  and
Exchange Commission.



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