EXHIBIT 32.1 CERTIFICATION OF PERIODIC REPORT Pursuant to ss. 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C. ss. 1350, the undersigned officer of Renaissance Learning, Inc. (the "Company"), hereby certifies that, to the undersigned's knowledge: (1) the Company's Quarterly Report on Form 10-Q for the quarter ended June 30, 2003 (the "Report") fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934; and (2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. Dated: August 11, 2003 /s/ John R. Hickey --------------------------------------------- Name: John R. Hickey Title: President and Chief Executive Officer THIS WRITTEN STATEMENT ACCOMPANIES THIS REPORT PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 AND SHALL NOT BE DEEMED TO BE FILED BY THE COMPANY FOR PURPOSES OF THE SECURITIES EXCHANGE ACT OF 1934