EXHIBIT 99.1

         Certification Pursuant to Section 1350 of Chapter 63 of Title 18 of the
         United States Code

         I, John M. Yeaman, the chief executive officer of Tyler Technologies,
         Inc., certify that (i) the Form 10-Q Quarterly Report fully complies
         with the requirements of Section 13(a) or 15(d) of the Securities
         Exchange Act of 1934 and (ii) the information contained in the Form
         10-Q Quarterly fairly presents, in all material respects, the financial
         condition and results of operations of Tyler Technologies, Inc.



                                       By: /s/ John M. Yeaman
                                          -------------------
                                       John M. Yeaman
                                       President and Chief Executive Officer