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     This announcement is neither an offer to purchase nor a solicitation of an
offer to sell Shares (as defined below). The Offer (as defined below) is being
made solely by the Offer to Purchase dated March 22, 2000 and the related Letter
of Transmittal, and is being made to holders of Shares. Purchaser (as defined
below) is not aware of any jurisdiction where the making of the Offer is
prohibited by any administrative or judicial action pursuant to any valid state
statute. If Purchaser becomes aware of any valid state statute prohibiting the
making of the Offer or the acceptance of Shares pursuant thereto, Purchaser will
make a good faith effort to comply with such state statute. If, after such good
faith effort, Purchaser cannot comply with such state statute, the Offer will
not be made to (nor will tenders be accepted from or on behalf of) the holders
of Shares in such state. In any jurisdiction where the securities, blue sky or
other laws require the Offer to be made by a licensed broker or dealer, the
Offer shall be deemed to be made on behalf of Purchaser by one or more
registered brokers or dealers licensed under the laws of such jurisdiction.

                      NOTICE OF OFFER TO PURCHASE FOR CASH
                     ALL OUTSTANDING SHARES OF COMMON STOCK
                                       OF
                     WAVE TECHNOLOGIES INTERNATIONAL, INC.
                                       AT

                              $9.75 NET PER SHARE
                                       BY

                          WTI ACQUISITION CORPORATION
                     AN INDIRECT WHOLLY OWNED SUBSIDIARY OF

                            THE THOMSON CORPORATION

     WTI Acquisition Corporation, a Delaware corporation ("Purchaser") and an
indirect wholly owned subsidiary of The Thomson Corporation, a corporation
organized under the laws of Ontario, Canada ("Thomson"), is offering to purchase
all the shares of common stock, par value $0.50 per share (the "Shares"), of
Wave Technologies International, Inc., a Missouri corporation (the "Company"),
that are issued and outstanding for $9.75 per Share, net to the seller in cash,
upon the terms and subject to the conditions set forth in the Offer to Purchase,
dated March 22, 2000 (the "Offer to Purchase"), and in the related Letter of
Transmittal (which, together with the Offer to Purchase and any amendments or
supplements thereto, collectively constitute the "Offer"). Following the Offer,
Purchaser intends to effect the Merger described below.

  THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY
        TIME, ON TUESDAY, APRIL 18, 2000, UNLESS THE OFFER IS EXTENDED.

     The Offer is conditioned upon, among other things, (i) there having been
validly tendered and not withdrawn prior to the expiration of the Offer at least
the number of Shares that constitutes two-thirds of the then outstanding shares
on a fully diluted basis (including, without limitation, all Shares issuable
upon the conversion of any convertible securities or upon the exercise of any
options, warrants, or rights (other than the rights issued pursuant to the
Rights Agreement, dated as of September 17, 1998 (the "Rights Agreement")
between the Company and ChaseMellon Shareholder Services, L.L.C., as Rights
Agent, and other than any shares issuable upon the exercise of any options in
respect of which the Purchaser has received an agreement from the option holder
not to exercise such option until after the record date for any meeting of the
stockholders of the Company for the purpose of considering and taking action on
the Merger Agreement,
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the Offer and the Merger) and (ii) any applicable waiting period under the
Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, having expired
or been terminated.

     The Offer is being made pursuant to an Agreement and Plan of Merger, dated
as of March 10, 2000 (the "Merger Agreement"), among Thomson US Holdings Inc., a
Delaware Corporation and a wholly owned subsidiary of Thomson ("Parent"),
Purchaser and the Company. The Merger Agreement provides that, among other
things, as promptly as practicable after the purchase of Shares pursuant to the
Offer and the satisfaction or, if permissible, waiver of the other conditions
set forth in the Merger Agreement and in accordance with relevant provisions of
the General Corporation Law of the State of Delaware ("Delaware Law") and the
Missouri General and Business Corporation Law ("Missouri Law"), Purchaser will
be merged with and into the Company (the "Merger"). As a result of the Merger,
the Company will continue as the surviving corporation (the "Surviving
Corporation") and will become an indirect wholly owned subsidiary of Thomson. At
the effective time of the Merger (the "Effective Time"), each Share issued and
outstanding immediately prior to the Effective Time (other than Shares held in
the treasury of the Company and other than Shares held by stockholders who shall
have demanded and perfected appraisal rights under Missouri Law) will be
canceled and converted automatically into the right to receive $9.75 in cash, or
any higher price that may be paid per Share in the Offer, without interest.

     THE BOARD OF DIRECTORS OF THE COMPANY HAS UNANIMOUSLY DETERMINED THAT EACH
OF THE OFFER AND THE MERGER IS FAIR TO, AND IN THE BEST INTEREST OF, THE
STOCKHOLDERS OF THE COMPANY, HAS APPROVED, ADOPTED AND DECLARED ADVISABLE THE
MERGER AGREEMENT AND THE MERGER AND HAS RESOLVED TO RECOMMEND THAT STOCKHOLDERS
ACCEPT THE OFFER AND TENDER THEIR SHARES PURSUANT TO THE OFFER.

     For purposes of the Offer, Purchaser will be deemed to have accepted for
payment (and thereby purchased) Shares validly tendered and not properly
withdrawn as, if and when Purchaser gives oral or written notice to ChaseMellon
Shareholder Services L.L.C. (the "Depositary") of Purchaser's acceptance for
payment of such Shares pursuant to the Offer. Upon the terms and subject to the
conditions of the Offer, payment for Shares accepted for payment pursuant to the
Offer will be made by deposit of the purchase price therefor with the
Depositary, which will act as agent for tendering stockholders for the purpose
of receiving payments from Purchaser and transmitting such payments to tendering
stockholders whose Shares have been accepted for payment. UNDER NO CIRCUMSTANCES
WILL INTEREST ON THE PURCHASE PRICE FOR SHARES BE PAID, REGARDLESS OF ANY DELAY
IN MAKING SUCH PAYMENT. In all cases, payment for Shares tendered and accepted
for payment pursuant to the Offer will be made only after timely receipt by the
Depositary of (i) the certificates evidencing such Shares (the "Share
Certificates") or timely confirmation of a book-entry transfer of such Shares
into the Depositary's account at the Book-Entry Transfer Facility (as defined in
Section 2 of the Offer to Purchase) pursuant to the procedure set forth in
Section 3 of the Offer to Purchase, (ii) the Letter of Transmittal (or a
manually signed facsimile thereof), properly completed and duly executed, with
any required signature guarantees or an Agent's Message (as defined in Section 2
of the Offer to Purchase) and (iii) any other documents required under the
Letter of Transmittal.

     Purchaser expressly reserves the right, in its sole discretion (but subject
to the terms and conditions of the Merger Agreement), at any time and from time
to time, to extend for any reason the period of time during which the Offer is
open, including the occurrence of any condition specified in Section 14 of the
Offer to Purchase, by giving oral or written notice of such extension to the
Depositary. Any such extension will be followed as promptly as practicable by
public announcement thereof, such announcement to be made no later than 9:00
a.m., New York City time, on the next business day after the previously
scheduled expiration date of the Offer. During any such extension, all Shares
previously tendered and not withdrawn will remain subject to the Offer and
subject to the right of a tendering stockholder to withdraw such stockholder's
Shares.

     Shares may be withdrawn at any time prior to 12:00 Midnight, New York City
time, on Tuesday, April 18, 2000 (or the latest time and date at which the
Offer, if extended by Purchaser, shall expire). For the withdrawal to be
effective, a written or facsimile transmission notice of withdrawal must be
timely received by the Depositary at one of its addresses set forth on the back
cover page of the Offer to Purchase. Any such notice of withdrawal must specify
the name of the person who tendered the Shares to be withdrawn, the number of
Shares to be withdrawn and the name of the registered holder of such Shares, if
different from that

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of the person who tendered such Shares. If Share Certificates evidencing Shares
to be withdrawn have been delivered or otherwise identified to the Depositary,
then, prior to the physical release of such Share Certificates, the serial
numbers shown on such Share Certificates must be submitted to the Depositary and
the signature(s) on the notice of withdrawal must be guaranteed by an Eligible
Institution (as defined in Section 3 of the Offer to Purchase), unless such
Shares have been tendered for the account of an Eligible Institution. If Shares
have been tendered pursuant to the procedure for book-entry transfer as set
forth in Section 3 of the Offer to Purchase, any notice of withdrawal must
specify the name and number of the account at the Book-Entry Transfer Facility
to be credited with the withdrawn Shares. All questions as to the form and
validity (including the time of receipt) of any notice of withdrawal will be
determined by Purchaser, in its sole discretion, whose determination will be
final and bidding.

     The information required to be disclosed by Rule 14d-6(d)(1) of the General
Rules and Regulations under the Securities Exchange Act of 1934, as amended, is
contained in the Offer to Purchase and is incorporated herein by reference.

     The Company has provided Purchaser with the Company's stockholder list and
security position listings, including the most recent list of names, addresses
and security positions of non-objecting beneficial owners in the possession of
the Company, for the purpose of disseminating the Offer to holders of Shares.
The Offer to Purchase and the related Letter of Transmittal will be mailed to
record holders of Shares whose names appear on the Company's stockholder lists
and will be furnished, for subsequent transmittal to beneficial owners of
Shares, to brokers, dealers, commercial banks, trust companies and similar
persons whose names, or the names of whose nominees, appear on the stockholder
list or, if applicable, who are listed as participants in a clearing agency's
security position listing.

     THE OFFER TO PURCHASE AND THE RELATED LETTER OF TRANSMITTAL CONTAIN
IMPORTANT INFORMATION WHICH SHOULD BE READ BEFORE ANY DECISION IS MADE WITH
RESPECT TO THE OFFER.

     Questions and requests for assistance or for additional copies of the Offer
to Purchase and the related Letter of Transmittal and other tender offer
materials may be directed to the Information Agent as set forth below, and
copies will be furnished promptly at Purchaser's expense. No fees or commissions
will be paid to brokers, dealers or other persons (other than the Information
Agent) for soliciting tenders of Shares pursuant to the Offer.

                    The Information Agent for the Offer is:

                           INNISFREE M&A INCORPORATED
                         501 Madison Avenue, 20th Floor
                               New York, NY 10022
                                 (212) 750-5833
                         Call Toll Free: (888) 750-5834

March 22, 2000

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