EXHIBIT 99.3

                      VOTING AND EXCHANGE TRUST SUPPLEMENT
 
  THIS VOTING AND EXCHANGE TRUST SUPPLEMENT is made as of the 12th day of May,
1999,
 
B E T W E E N :
 
                MATTEL, INC.
                a corporation governed by the laws of
                the State of Delaware,
                (hereinafter referred to as "Mattel"),
 
                                                  OF THE FIRST PART,
 
                               - and -
 
                THE LEARNING COMPANY, INC.
                a corporation governed by the laws of
                the State of Delaware,
                (hereinafter referred to as "TLC"),
 
                                                  OF THE SECOND PART,
 
                               - and -
 
                SOFTKEY SOFTWARE PRODUCTS INC.,
                a corporation governed by the laws of
                the Province of Ontario,
                (hereinafter referred to as "Softkey"),
 
                                                  OF THE THIRD PART,
 
                               - and -
 
                CIBC MELLON TRUST COMPANY,
                a trust company incorporated under
                the laws of Canada,
                (hereinafter referred to as the "Trustee"),
 
                                                  OF THE FOURTH PART.

 
  WHEREAS TLC (under its predecessor name, "Softkey International Inc."),
Softkey and the Trustee (under its predecessor name, "The R-M Trust Company")
entered into a voting and exchange trust agreement made as of the 4th day of
February, 1994 (the "Original Trust Agreement") relating to the granting of (i)
voting rights in TLC to holders of Exchangeable Shares and (ii) certain rights
in favour of such holders to require TLC to purchase all or part of the
Exchangeable Shares held by such holders;
 
  AND WHEREAS, pursuant to, among other things, the Exchangeable Share
Provisions, the Exchangeable Shares are currently exchangeable, on a one-for-
one basis, for shares of common stock in the capital of TLC;
 
  AND WHEREAS pursuant to an agreement and plan of merger dated as of December
13, 1998 between Mattel and TLC (the "Merger Agreement"), it is proposed that
TLC merge with and into Mattel (the "Merger") with the result that, pursuant to
the Merger Agreement and in accordance with the Delaware General Corporation
Law, (i) the outstanding shares of common stock in the capital of TLC will be
changed and converted into and represent the right to receive shares of common
stock in the capital of Mattel and (ii) the separate corporate existence of TLC
will cease and Mattel will continue as the surviving corporation and will
succeed to and assume all of the rights and obligations of TLC, including
without limitation the rights and obligations of TLC under the Original Trust
Agreement;
 
  AND WHEREAS, following the Merger and pursuant to, among other things, the
Exchangeable Share Provisions, the Exchangeable Shares will be exchangeable for
shares of common stock in the capital of Mattel, on the basis of 1.2 shares of
Mattel common stock per Exchangeable Share (being the Exchange Ratio as that
term is defined herein);
 
  AND WHEREAS, pursuant to Articles 11 and 12 of the Original Trust Agreement,
as a result of the Merger the Original Trust Agreement must be amended,
modified and supplemented as necessary in order that it applies with full force
and effect, mutatis mutandis, to the shares of common stock in the capital of
Mattel following the Merger and the parties to the Original Trust Agreement are
required to execute and deliver this voting and exchange trust supplement
giving effect to and evidencing such necessary amendments and modifications;
 
  AND WHEREAS Mattel and TLC propose to complete the Merger pursuant to the
Merger Agreement and in accordance with the Delaware General Corporation Law
immediately following the execution and delivery of this voting and exchange
trust supplement by the parties hereto;
 
  AND WHEREAS the board of directors of each of TLC and Softkey is of the
opinion that the amendments and modifications to be effected hereby are not
inconsistent with the Original Trust Agreement, are necessary and desirable in
light of the Merger and will not be prejudicial to the interests of the holders
of the Exchangeable Shares;
 
  NOW THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which is hereby acknowledge by each of the parties hereto, the
parties hereby agree as follows:
 
                                   ARTICLE 1
 
                                 INTERPRETATION
 
  1.1 "Hereto", "herein", "hereunder", "hereof" and similar expressions refer
to this voting and exchange trust supplement and not to any particular article,
section or other portion hereof and include any and every instrument
supplemental or ancillary hereto.
 
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  1.2 The division of this voting and exchange trust supplement into articles
and sections is for convenience of reference only and shall not affect the
construction or interpretation of this voting and exchange trust supplement.
 
  1.3 All terms contained in this voting and exchange trust supplement,
including the recitals hereto, which are defined in the Original Trust
Agreement shall, for the purposes hereof, have the meanings given to such terms
in the Original Trust Agreement unless otherwise defined herein or unless the
context otherwise specifies or requires.
 
                                   ARTICLE 2
 
                      ISSUE OF MATTEL SPECIAL VOTING SHARE
 
  2.1 Immediately upon the Merger becoming effective under the Delaware General
Corporation Law, (a) Mattel shall issue to and deposit with the Trustee one
share of special voting preferred stock, U.S.$1.00 par value per share, of
Mattel (the "Mattel Special Voting Stock") to be thereafter held of record by
the Trustee as trustee for and on behalf of, and for the use and benefit of,
the Beneficiaries and in accordance with the provisions of the Original Trust
Agreement as amended, modified and supplemented by this voting and exchange
trust supplement, and (b) the Trustee shall surrender to Mattel the certificate
formerly representing the one outstanding share of special voting stock, par
value U.S.$1.00 per share, of TLC.
 
                                   ARTICLE 3
 
                     AMENDMENTS TO ORIGINAL TRUST AGREEMENT
 
  The Original Trust Agreement is hereby amended, modified and supplemented,
immediately upon the Merger becoming effective under the Delaware General
Corporation Law, as follows:
 
  3.1 Section 1.1 of the Original Trust Agreement is hereby amended, modified
and supplemented as follows:
 
  (a) by deleting the words "Boston, Massachusetts" in the definition of
     "Business Day" and replacing them with the words "Los Angeles,
     California";
 
  (b) by deleting the definition of "Current Market Price" and replacing it
     with the following:
 
    " "Current Market Price" means, in respect of a Mattel Common Share on
    any date, the Canadian Dollar Equivalent of the average of the closing
    bid and asked prices of Mattel Common Shares during a period of 20
    consecutive trading days ending not more than five trading days before
    such date on the New York Stock Exchange or, if the Mattel Common
    Shares are not then listed on the New York Stock Exchange, on such
    other stock exchange or automated quotation system on which the Mattel
    Common Shares are listed or quoted, as the case may be, as may be
    selected by the Board of Directors for such purpose; provided, however,
    that if in the opinion of the Board of Directors the public
    distribution or trading activity of Mattel Common Shares during such
    period does not create a market which reflects the fair market value of
    a Mattel Common Share, then the Current Market Price of a Mattel Common
    Share shall be determined by the Board of Directors based upon the
    advice of such qualified independent financial advisers as the Board of
    Directors of Mattel may deem to be appropriate, and provided further
    that any such selection, opinion or determination by the Board of
    Directors shall be conclusive and binding."
 
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  (c) by adding the following definition after the definition of "Current
     Market Price":
 
    " "Exchange Ratio" means 1.2."
 
  (d) by adding the following definitions after the definition of "List":
 
    " "Mattel" means Mattel, Inc., a corporation governed by the laws of
    the State of Delaware, and any successor thereto.
 
    "Mattel Common Shares" means the shares of common stock in the capital
    of Mattel (together with the accompanying rights, if any, to purchase
    shares of Series E Junior Participating Preference Stock, par value
    U.S. $0.01 per share, in the capital of Mattel, subject to adjustment
    as contemplated by such rights) and any other securities into which
    such shares may be changed or converted."
 
  (e) by deleting the word "Parent" in each of the definitions of "Parent
     Consent", "Parent Meeting" and "Parent Successor" and replacing it with
     the word "Mattel" in each such definition;
 
  (f) by deleting the definition of "Support Agreement" and replacing it with
     the following definition:
 
    " "Support Agreement" means that certain support agreement made as of
    the 4th day of February 1994 between Softkey International Inc. (a
    predecessor corporate name of The Learning Company, Inc.) and the
    Corporation, as amended by that certain amending agreement made as of
    the 12th day of May 1999 between Mattel, The Learning Company, Inc. and
    the Corporation."
 
  (g) by deleting the words "The R-M Trust Company" in the definition of
     "Trustee" and replacing them with the words "CIBC Mellon Trust Company";
 
  (h) by deleting the definition of "Voting Share" and replacing it with the
     following:
 
    " "Voting Share" means the one share of special voting preferred stock,
    U.S. $1.00 par value, of Mattel, issued by Mattel to and deposited with
    the Trustee, which entitles the holder of record to a number of votes
    at meetings of holders of Mattel Common Shares equal to the product of
    (i) the number of Exchangeable Shares outstanding from time to time
    other than Exchangeable Shares held by Mattel, its subsidiaries or any
    person directly or indirectly controlled by or under common control of
    Mattel, multiplied by (ii) the Exchange Ratio."
 
  3.2 Each reference in Articles 1 to 14, inclusive, of the Original Trust
Agreement to "the Parent" is hereby deleted and replaced with "Mattel".
 
  3.3 Each reference in Articles 1 to 14, inclusive, of the Original Trust
Agreement to "Parent Common Shares" is hereby deleted and replaced with "Mattel
Common Shares".
 
  3.4 Each reference in Articles 11 and 12 of the Original Trust Agreement to
"Parent Successor" is hereby deleted and replaced with "Mattel Successor".
 
  3.5 Section 3.1 of the Original Trust Agreement is hereby amended, modified
and supplemented by deleting the first two sentences thereof.
 
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  3.6 Section 4.2 of the Original Trust Agreement is hereby deleted and
replaced with the following:
 
     "4.2 Number of Votes. With respect to all meetings of shareholders of
     Mattel at which holders of Mattel Common Shares are entitled to vote
     (a "Mattel Meeting") and with respect to all written consents sought
     by Mattel from its shareholders including the holders of Mattel Common
     Shares (a "Mattel Consent"), each Beneficiary shall be entitled to
     instruct the Trustee to cast and exercise such number of votes
     comprised in the Voting Rights equal to the product (rounded down to
     the nearest one-hundredth of a share) of (i) the aggregate number of
     Exchangeable Shares owned of record by such Beneficiary on the record
     date established by Mattel or by applicable law for such Mattel
     Meeting or Mattel Consent, as the case may be, multiplied by (ii) the
     Exchange Ratio (the "Beneficiary Votes"), in respect of each matter,
     question or proposition to be voted on at such Mattel Meeting or to be
     consented to in connection with such Mattel Consent."
 
  3.7 Section 5.4 of the Original Trust Agreement is hereby deleted and
replaced with the following:
 
     "5.4 Purchase Price. The purchase price payable by Mattel for the
     Exchangeable Shares to be purchased by Mattel from each Beneficiary
     under the Exchange Right shall be the sum of:
 
             (a) (i) the Current Market Price of a Mattel Common Share on the
                 last Business Day prior to the day of closing of the purchase
                 and sale of such Exchangeable Shares under the Exchange
                 Right, multiplied by (ii) the number of Exchangeable Shares
                 to be purchased from such Beneficiary under the Exchange
                 Right, multiplied by (iii) the Exchange Ratio; and
 
             (b) the full amount of all dividends declared and unpaid on such
                 Exchangeable Shares to be so purchased (provided that if the
                 record date for any such declared and unpaid dividends occurs
                 on or after the day of closing of such purchase and sale the
                 purchase price shall not include any amounts in respect of
                 such declared and unpaid dividends).
 
    The purchase price for such Exchangeable Shares so purchased from each
    Beneficiary under the Exchange Right shall be satisfied as follows:
 
             (c) in respect of the portion of the purchase price described in
                 paragraph (a) above, by Mattel issuing and delivering or
                 causing to be delivered to the Trustee, on behalf of such
                 Beneficiary, (i) a number of Mattel Common Shares, rounded
                 down to the nearest whole number of Mattel Common Shares,
                 equal to (x) such portion of the purchase price divided by
                 (y) the Current Market Price of a Mattel Common Share on the
                 last Business Day prior to the day of closing of the purchase
                 and sale of such Exchangeable Shares under the Exchange Right
                 and (ii) a cheque in payment of the fractional Mattel Common
                 Share, if any, resulting from the calculation in (i) above
                 (before any such rounding) in an amount equal to the
                 corresponding fractional amount of the Current Market Price
                 of a Mattel Common Share on the last Business Day prior to
                 the day of closing of the purchase and sale of such
                 Exchangeable Shares under the Exchange Right; and
 
                                       5

 
             (d) in respect of the portion of the purchase price described in
                 paragraph (b) above, by Mattel issuing and delivering or
                 causing to be delivered to the Trustee, on behalf of such
                 Beneficiary, a cheque in payment of such declared and unpaid
                 dividends.
 
             In connection with each exercise of the Exchange Right, Mattel
             will provide to the Trustee an Officer's Certificate setting
             forth the calculation of the purchase price for the Exchangeable
             Shares so purchased thereunder."
 
  3.8 Section 5.11 of the Original Trust Agreement is hereby amended, modified
and supplemented by adding the words ", multiplied by the Exchange Ratio" after
the words "time to time" in the fifth and seventh lines of such section.
 
  3.9 Paragraph (c) of section 5.12 of the Original Trust Agreement is hereby
amended, modified and supplemented by deleting the second and third sentences
thereof and replacing them with the following:
 
     "To effect such automatic exchange, Mattel shall purchase all
     Exchangeable Shares outstanding on the fifth Business Day prior to the
     Liquidation Event Effective Date held by each Beneficiary, and each
     such Beneficiary shall sell all Exchangeable Shares held by it at such
     time, for a purchase price equal to the sum of:
 
             (a) (i) the Current Market Price of a Mattel Common Share on the
                 fifth Business Day prior to the Liquidation Event Effective
                 Date, multiplied by (ii) the number of Exchangeable Shares to
                 be purchased from such Beneficiary pursuant to such automatic
                 exchange, multiplied by (iii) the Exchange Ratio; and
 
             (b) the full amount of all dividends declared and unpaid on such
                 Exchangeable Shares to be so purchased.
 
     The purchase price for such Exchangeable Shares so purchased from each
     Beneficiary pursuant to such automatic exchange shall be satisfied as
     follows:
 
             (c) in respect of the portion of the purchase price described in
                 paragraph (a) above, by Mattel issuing and delivering or
                 causing to be delivered to such Beneficiary (i) a number of
                 Mattel Common Shares, rounded down to the nearest whole
                 number of Mattel Common Shares, equal to (x) such portion of
                 the purchase price divided by (y) the Current Market Price of
                 a Mattel Common Share on the fifth Business Day prior to the
                 Liquidation Event Effective Date and (ii) a cheque in payment
                 of the fractional Mattel Common Share, if any, resulting from
                 the calculation in (i) above (before any such rounding) in an
                 amount equal to the corresponding fractional amount of the
                 Current Market Price of a Mattel Common Share on the fifth
                 Business Day prior to the Liquidation Event Effective Date;
                 and
 
             (d) in respect of the portion of the purchase price described in
                 paragraph (b) above, by Mattel issuing and delivering or
                 causing to be delivered to such Beneficiary a cheque in
                 payment of such declared and unpaid dividends.
 
             In connection with such automatic exchange, Mattel will provide
             to the Trustee an Officer's Certificate setting forth the
             calculation of the purchase price for the Exchangeable Shares so
             purchased pursuant thereto."
 
 
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  3.10 Section 6.1 of the Original Trust Agreement is hereby amended, modified
and supplemented by deleting the words "Parent Special Voting Stock" in the
second line of such section and replacing them with the words "special voting
preferred stock, U.S. $1.00 par value, of Mattel".
 
  3.11 Section 12.4 of the Original Trust Agreement is hereby amended, modified
and supplemented by adding the words ", notwithstanding the provisions of
section 12.1 hereof," after the words "changed and" in the third last line of
section 12.4.
 
  3.12 Paragraphs (a), (b) and (c) of section 14.3 of the Original Trust
Agreement are hereby deleted and replaced with the following:
 
  (a) if to Mattel or the Corporation, c/o Mattel at:
 
      333 Continental Boulevard
      El Segundo, CA 90245-5012
      U.S.A.
      Attention: General Counsel
      Telecopy: (310) 252-3671
 
  (b) if to the Trustee at:
 
      320 Bay Street
      P.O. Box 1
      Toronto, Ontario
      M5H 4A6
      Attention: Assistant Vice President, Client Services
      Telecopy: (416) 643-5570
 
                                   ARTICLE 4
 
                           ASSUMPTION OF OBLIGATIONS
 
  4.1 Mattel hereby confirms, covenants and agrees that, immediately upon the
Merger becoming effective under the Delaware General Corporation Law, Mattel
has succeeded to the position of TLC under the Original Trust Agreement as
amended, modified and supplemented hereby and, without limitation of the
foregoing, that it has assumed liability for all moneys payable and property
deliverable under the Original Trust Agreement as amended, modified and
supplemented hereby, and that it will pay and deliver or cause to be delivered
all such moneys and property and will observe and perform all the covenants and
obligations of TLC under the Original Trust Agreement as amended, modified and
supplemented hereby.
 
                                   ARTICLE 5
 
                                    GENERAL
 
  5.1 This voting and exchange trust supplement is supplementary to and amends
and modifies the Original Trust Agreement as herein set forth. Immediately upon
the Merger becoming effective under the Delaware General Corporation Law, the
Original Trust Agreement shall thereafter be read in conjunction with this
voting and exchange trust supplement and the Original Trust Agreement and this
voting and exchange trust supplement shall be deemed for all purposes to be a
part of the Original Trust Agreement and shall have effect so far as is
practicable as if all the provisions of the Original Trust Agreement and this
voting and exchange trust supplement were contained in one instrument.
 
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  5.2 This voting and exchange trust supplement and the Original Trust
Agreement constitute the entire agreement between the parties relating to the
subject matter hereof and thereof. This voting and exchange trust supplement
supersedes all prior agreements and understandings of the parties, whether oral
or written, including the Original Trust Agreement, with respect to the
portions of the Original Trust Agreement hereby amended, modified and
supplemented. There are no general or specific representations, warranties or
other agreements by or among the parties in connection with the entering into
of this voting and exchange trust supplement or the subject matter hereof
except as specifically set forth herein.
 
  5.3 This voting and exchange trust supplement may be executed in several
counterparts, each of which when so executed shall be deemed to be an original,
and such counterparts together shall constitute one and the same instrument.
 
  5.4 This voting and exchange trust supplement shall be construed and enforced
in accordance with the laws of the Province of Ontario and the laws of Canada
applicable therein.
 
  5.5 Mattel agrees that any action or proceeding arising out of or relating to
this voting and exchange trust supplement may be instituted in the courts of
Ontario, waives any objection which it may now or hereafter have to the venue
of any such action or proceeding, irrevocably submits to the jurisdiction of
the said courts in any such action or proceeding, agrees to be bound by any
judgment of the said courts and not to seek, and hereby waives, any review of
the merits of any such judgment by the courts of any other jurisdiction and
hereby appoints Softkey at its registered office in the Province of Ontario as
Mattel's attorney for service of process.
 
  5.6 This voting and exchange trust supplement shall be binding upon and enure
to the benefit of the parties hereto and their respective successors and
assigns.
 
  IN WITNESS WHEREOF the parties hereto have executed this voting and exchange
trust supplement as of the date first referred to above.
 
                                          MATTEL, INC.
 
                                          By: /s/ Robert Normile 
                                             _________________________________
                                                  Robert Normile
                                             __________________________________
 
                                          THE LEARNING COMPANY, INC.
 
                                          By: /s/ R. Scott Murray
                                             _________________________________
                                                  R. Scott Murray
                                             __________________________________
 
                                          SOFTKEY SOFTWARE PRODUCTS INC.
 
                                          By: /s/ R. Scott Murray 
                                             _________________________________
                                                  R. Scott Murray
                                             __________________________________
 
                                          CIBC MELLON TRUST COMPANY
 
                                          By: /s/ Warren Jansen
                                             __________________________________
                                                  Warren Jansen
                                             __________________________________
 
                                          By: /s/ Susan Clough
                                             __________________________________
                                                  Susan Clough
                                             __________________________________

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