EXHIBIT 3.31

                         CERTIFICATE OF INCORPORATION

                                      OF

                        IT INTERNATIONAL HOLDINGS, INC.


FIRST:   The name of the corporation is:   IT International Holdings, Inc.

SECOND:  The address of the registered office of the corporation in the State of
         Delaware is 1209 Orange Street, Wilmington, Delaware 19801, and the
         name of the registered agent at that address is The Corporation Trust
         Company.

THIRD:   The purpose of the corporation is to engage in any lawful act or
         activity for which corporations may be organized under the General
         Corporation Law of Delaware.

FOURTH:  The corporation shall be authorized to issue one class of stock to be
         designated Common Stock; the total number of shares which the
         corporation shall have authority to issue is five hundred thousand
         (500,000), and each such share shall have a par value of One Cent
         ($0.01)).

FIFTH:   The name and mailing address of the incorporator of the corporation is:

                    James M. Redwine, Esquire
                    IT Corporation
                    2790 Mosside Boulevard
                    Monroeville, PA 15146

SIXTH:   The board of directors is authorized to make, alter or repeal the
         bylaws of the corporation. Election of directors need not be by written
         ballot.

     I, THE UNDERSIGNED, being the incorporator hereinbefore named, for the
purpose of forming a corporation pursuant to the General Corporation Law of the
State of Delaware, do make this certificate, hereby declaring and certifying
that this is my act and deed and the facts herein stated are true, and
accordingly have hereunto set my hand this 22nd day of January, 1999.

                                           /s/ James M. Redwine
                                           -------------------------------------
                                               Sole Incorporator