The Mark Twain School in Rockville, Maryland serves emotionally disturbed students in Grades 5 through 12 whose severity of emotional problems seriously impairs their successful functioning in regular classes. The Department of Educational Accountability has conducted a study of characteristics of students served in the Mark Twain School and the degree of their academic success in regular schools after completing the Mark Twain program. This study was designed to describe the student population at Mark Twain in recent years; monitor the progress of former students who have been returned to regular schools; and determine which variables best predict the eventual success of these students. This report describes the current Mark Twain program, evaluation issues, and the sample and instrumentation used in the study. Detailed findings of this study are presented graphically. The predictor variables of success determined by the study were discussed. A five page executive summary is included. (DWH)