Success for All is the most extensively researched of all comprehensive reform models for Title I elementary schools. It incorporates scientifically based principles of reading, cooperative learning, professional development, tutoring, and family support. Nevada elementary schools implementing the Success for All reading program made outstanding gains on the 2004 Nevada Criterion-Referenced Assessment in reading. Averaging the gains of third and fifth graders from 2002 to 2004, students in the 21 Nevada Success for All schools statewide gained an average of 2.8 percentage points in percent passing. Over that same time period, Nevada students in general declined by 5.9% in percent passing.