Oklahoma's three-tiered system of higher education provides access for all students, with the comprehensive universities requiring the highest standards, regional universities requiring less restrictive standards, and the two-year colleges having open door access. The various tiers help students match their level of academic preparation to the appropriate learning environment necessary for college success. Every two years, the State Regents publish the "Admission Policy Impact Study" as part of a policy evaluation process. During the late 1980s, Oklahoma's student academic performance lagged behind that of other regional states. This paper outlines the State Regents' comprehensive efforts to accelerate positive academic change to Oklahoma's higher education system with a combination of strengthened admission/retention and assessment standards. It concludes with student performance information, from 1987-88 through 1997-98, that indicates a favorable systemwide impact. (EV)