This booklet addresses the difficulties of comparing and drawing meaning from dropout data prepared by different agencies, and examines the characteristics of students--and of schools--that place students at risk for leaving school prematurely. The booklet describes prevention programs and presents evidence on their effectiveness. It reviews research on school dropouts among special education populations--research that attempts to establish the magnitude of the problem, identify predictors or correlates of those at risk, and evaluate the effectiveness of programs to reduce dropout rates. It presents suggestions for teachers and administrators intended to minimize the likelihood of students' dropping out. A chapter on program implications discusses such issues as establishing dropout rates, establishing graduation/completion criteria, and adopting prevention programs. The booklet includes a list of 43 references and 47 print resources. (JDD)