<PAGE>

 EXHIBIT 3.6 - CERTIFICATE OF CORRECTION OF CERTIFICATE OF DESIGNATIONS OF THE
            SERIES A CONVERTIBLE PREFERRED STOCK, DATED MAY 5, 2003

                          CERTIFICATE OF CORRECTION OF
                           CERTIFICATE OF DESIGNATIONS
                                     OF THE
                      SERIES A CONVERTIBLE PREFERRED STOCK
                           (PAR VALUE $.01 PER SHARE)

                                       OF

                              TECHTEAM GLOBAL, INC.

         TECHTEAM GLOBAL, INC., a corporation organized and existing under the
General Corporation Law of the State of Delaware, hereby certifies that:

         1.       The name of the corporation is TechTeam Global, Inc. (the
"Company").

         2.       The Certificate of Designations of the Series A Convertible
Preferred Stock (Par Value $.01 Per Share) of the Company, which was filed by
the Secretary of State of Delaware on April 7, 2003, is hereby corrected.

         3.       The inaccuracy to be corrected in said instrument is as
follows:

                  Section 9 of the Certificate of Designations inaccurately
         omitted language providing that no adjustments shall be made to the
         conversion rights of the Series A Convertible Preferred Stock under
         Section 9 or otherwise under the Certificate of Designations as a
         result of any issuance by the Company of shares of its common stock,
         $.01 par value per share, or other securities pursuant to that certain
         Rights Agreement, dated May 6, 1997, between the Company and U.S. Stock
         Transfer Corporation, as may be amended from time to time.

         4.       The portion of the instrument in corrected form is as follows:

                  "Section 9. Conversion. The Series A Preferred Stock shall,
         prior to the payment or declaration of a Liquidation Preference, be
         convertible into Common Stock as follows:

                  (a)      Right to Convert. Each share of Series A Preferred
         Stock shall be convertible, at the option of the holder thereof, at any
         time after the first anniversary of the initial issuance thereof, into
         that number of shares of Common Stock determined by dividing (i) $7.25
         by (ii) the Conversion Price (as hereinafter defined). Notwithstanding
         the foregoing sentence, (A) no holder of Series A Preferred Stock may
         convert fewer than 70,000 shares of Series A Preferred Stock at any one
         time (unless such holder holds less than 70,000 shares of Series A
         Preferred Stock in which case such holder may only convert the entire
         amount of shares of Series A Preferred Stock then held), and (B) the
         conversion rights set forth in this Section 9(a) shall be subject to
         the restrictions set forth in Section 12(b) below. A holder of shares
         of Series A Preferred Stock may exercise the conversion right as to any
         shares of Series A Preferred Stock by delivering to the Company, during
         regular business hours, or to the office of any transfer agent of the
         Company for the Common Stock or at such other office or agency as may
         be designated by the Company in writing to the holders of Series A
         Preferred Stock, the certificate or certificates for the shares to be
         converted, duly endorsed in blank or assigned to the Company, and
         accompanied by written

                                       62

<PAGE>

         notice stating that the holder elects to convert such shares.
         Conversion shall be deemed to have been effected on the date when such
         written notice and the endorsed stock certificate or certificates are
         received by the Company (the "Optional Conversion Date"). Upon any
         conversion pursuant to this Section 9(a), any accrued but unpaid
         dividends shall be paid in cash.

                  (b)      Conversion Price. The conversion price ("Conversion
         Price") shall initially be $7.25. The Conversion Price shall be subject
         to adjustment as provided in Sections 9(c) and (e) below.

                  (c)      Adjustment Upon Common Stock Event. Upon the
         happening of a Common Stock Event (as hereinafter defined), the
         Conversion Price of the Series A Preferred Stock shall, simultaneously
         with the happening of such Common Stock Event, be adjusted by
         multiplying the Conversion Price of the Series A Preferred Stock in
         effect immediately prior to such Common Stock Event by a fraction, (i)
         the numerator of which shall be the number of shares of Common Stock
         issued and outstanding immediately prior to such Common Stock Event,
         and (ii) the denominator of which shall be the number of shares of
         Common Stock issued and outstanding immediately after such Common Stock
         Event, and the product so obtained shall thereafter be the Conversion
         Price for the Series A Preferred Stock. The Conversion Price for the
         Series A Preferred Stock shall be readjusted in the same manner upon
         the happening of each subsequent Common Stock Event. As used herein,
         the term "Common Stock Event" shall mean (i) the issuance by the
         Company of additional shares of Common Stock as a dividend or other
         distribution on outstanding Common Stock, (ii) a subdivision of the
         outstanding shares of Common Stock into a greater number of shares of
         Common Stock, or (iii) a combination of the outstanding shares of
         Common Stock into a smaller number of shares of Common Stock; provided,
         however, that the issuance by the Company of shares of Common Stock or
         other securities, ranking junior to the Series A Preferred Stock,
         pursuant to that certain Rights Agreement, dated May 6, 1997, between
         the Company and U.S. Stock Transfer Corporation, as may be amended from
         time to time (the "Rights Agreement"), shall not constitute a Common
         Stock Event.

                  (d)      Adjustment for Reclassification, Exchange and
         Substitution. If at any time or from time to time after the original
         date of issuance of the shares of Series A Preferred Stock (the
         "Original Issue Date") the Common Stock issuable upon the conversion of
         the Series A Preferred Stock is changed into the same or a different
         number of shares of any class or classes of stock, whether by
         recapitalization, reclassification, substitution or otherwise (other
         than by a Common Stock Event, pursuant to the Rights Agreement or a
         reorganization, merger, consolidation or sale of assets provided for
         elsewhere in this Section 9), then in any such event each holder of
         Series A Preferred Stock shall have the right thereafter to convert
         such stock into the kind and amount of stock and other securities and
         property receivable upon such recapitalization, reclassification or
         other change by holders of the number of shares of Common Stock into
         which such shares of Series A Preferred Stock could have been converted
         immediately prior to such recapitalization, reclassification or change,
         all subject to further adjustment as provided herein or with respect to
         such other securities or property by the terms thereof.

                  (e)      Dilutive Issuance. If at any time or from time to
         time after the Original Issue Date the Company issues or sells, or is
         deemed by the provisions of this Section 9(e) to have issued or sold,
         Additional Shares of Common Stock (as hereinafter defined), otherwise
         than in connection with a Common Stock Event as provided in Section
         9(c) or a recapitalization, reclassification, substitution or other
         change as provided in Section 9(d), for a purchase price per share that
         is less than the Conversion Price for the Series A Preferred Stock in
         effect immediately prior to such issue or sale (a "Dilutive Issuance"),
         then, and in each such case, the Conversion Price for the Series A
         Preferred Stock shall be reduced, as of the close of business on the
         date of such issue or sale, to the price obtained by multiplying such
         Conversion Price by a fraction:

                                       63

<PAGE>

                           (i)      The numerator of which shall be the sum of
                  (A) the number of Common Stock Equivalents Outstanding (as
                  hereinafter defined) immediately prior to such issue or sale
                  of Additional Shares of Common Stock plus (B) the quotient
                  obtained by dividing the Aggregate Consideration Received (as
                  hereinafter defined) by the Company for the total number of
                  Additional Shares of Common Stock so issued or sold by the
                  Conversion Price for the Series A Preferred Stock in effect
                  immediately prior to such issue or sale; and

                           (ii)     The denominator of which shall be the sum of
                  (A) the number of Common Stock Equivalents Outstanding
                  immediately prior to such issue or sale plus (B) the number of
                  Additional Shares of Common Stock so issued or sold (or deemed
                  so issued and sold).

                  (f)      Certain Definitions. For the purpose of making any
         adjustment required under this Section 9:

                           (i)      "Additional Shares of Common Stock" shall
                  mean all shares of Common Stock issued by the Company, or
                  issuable upon conversion or exercise of any Convertible
                  Securities, Rights or Options issued by the Company, whether
                  or not subsequently reacquired or retired by the Company,
                  other than: (i) shares of Common Stock issued or issuable upon
                  conversion of Series A Preferred Stock; (ii) shares of Common
                  Stock issued upon conversion or exchange of any existing
                  convertible securities or exercise of any existing warrants or
                  options; (iii) shares of Common Stock issued or issuable as a
                  dividend or distribution on the Series A Preferred Stock; (iv)
                  shares of Common Stock or options, warrants, convertible
                  securities or other rights to acquire shares of Common Stock
                  issued or issuable pursuant to the Company's existing stock
                  plans and option plans, or any future plans approved by vote
                  of the Company's Common Stock; (v) shares of Common Stock
                  issued in connection with a merger or acquisition of all or
                  substantially all of the assets of a third party; or (vi)
                  shares of Common Stock or other securities, ranking junior to
                  the Series A Preferred Stock, issued by the Company pursuant
                  to the Rights Agreement;

                           (ii)     The "Aggregate Consideration Received" by
                  the Company for any issue or sale (or deemed issue or sale) of
                  securities shall (i) to the extent it consists of cash, be
                  computed at the gross amount of cash received by the Company
                  before deduction of any underwriting or similar commissions,
                  compensation or concessions paid or allowed by the Company in
                  connection with such issue or sale and without deduction of
                  any expenses payable by the Company; (ii) to the extent it
                  consists of property other than cash, be computed at the fair
                  value of that property as determined in good faith by the
                  Board of Directors of the Company; and (iii) if Additional
                  Shares of Common Stock, Convertible Securities or Rights or
                  Options to purchase either Additional Shares of Common Stock
                  or Convertible Securities are issued or sold together with
                  other stock or securities or other assets of the Company for a
                  consideration which covers both, be computed as the portion of
                  the consideration so received that may be reasonably
                  determined in good faith by the Board of Directors of the
                  Company to be allocable to such Additional Shares of Common
                  Stock, Convertible Securities or Rights or Options;

                           (iii)    "Common Stock Equivalents Outstanding" shall
                  mean the number of shares of Common Stock that is equal to the
                  sum of (A) all shares of Common Stock of the Company that are
                  outstanding at the time in question, plus (B) all shares of
                  Common Stock of the Company issuable upon conversion of all
                  shares of Series A Preferred Stock or other Convertible
                  Securities that are outstanding at the time in question, plus
                  (C) all shares of Common Stock of the Company that are
                  issuable upon the exercise of Rights or Options that are
                  outstanding at the time in question assuming the full
                  conversion or exchange into Common Stock of all such Rights or
                  Options that are Rights or Options to purchase or

                                       64

<PAGE>

                  acquire Convertible Securities into or for Common Stock;

                           (iv)     "Convertible Securities" shall mean stock
                  (excluding the Series A Preferred Stock) or other securities
                  convertible into or exchangeable for shares of Common Stock;

                           (v)      The "Effective Price" of Additional Shares
                  of Common Stock shall mean the quotient determined by dividing
                  the total number of Additional Shares of Common Stock issued
                  or sold, or deemed to have been issued or sold, by the Company
                  under this Section 9, into the Aggregate Consideration
                  Received, or deemed to have been received, by the Company
                  under this Section 9, for the issue of such Additional Shares
                  of Common Stock; and

                           (vi)     "Rights or Options" shall mean warrants,
                  options or other rights to purchase or acquire Additional
                  Shares of Common Stock or Convertible Securities.

                  (g)      Coordination with Rights Agreement. For the avoidance
         on any doubt, no adjustments shall be made under this Section 9 as a
         result of any issuance by the Company of shares of Common Stock or
         other securities, ranking junior to the Series A Preferred Stock,
         pursuant to the Rights Agreement."

                                      ****

         IN WITNESS WHEREOF, the Company has caused this Certificate of
Corrections to be signed and executed in its corporate name by William F. Coyro,
its President and Chief Executive Officer, as of this 5th day of May 2003.

                                      TECHTEAM GLOBAL, INC.

                                      By: /s/  William F. Coyro, Jr.
                                          --------------------------------------
                                          William F. Coyro, Jr.
                                          President and Chief Executive Officer

                                       65