The proposals with more information were updated in 1999 ut were originally written earlier.
43For more information about the analytical framework for assessing Social Security reform proposals offered by GAO, see Social  Criteria for Evaluating Social Security Reform Proposals (GAO/T-HEHS-99-94, March 25, 1999) and Social  Evaluating Reform Proposals (GAO/AIMD/HEHS-00-29, November 4, 1999).