Supplemental Instruction (SI) is a national program designed to aid college student learning. Many researchers have noted that analysis of the impact of the SI program on student achievement is problematic as a result of the inherent self-selection bias. We apply a sufficiently sophisticated statistical technique that controls for the…

An evaluative study was done of the Teen Outreach Program, a national, multi-site effort to reduce teenage pregnancy, school failure, and dropout. The study sought to identify the critical "active ingredients" of the program responsible for its success. The study was based on analyses of data collected at 114 different sites nationally,…