An analysis of research on the effectiveness of developmental education is presented in this report. Chapter I highlights different perspectives on the role of developmental education at the college level; examines definitions and discusses the mission of developmental education; and puts forward a methodology for measuring its effectiveness. Chapter II presents research assumptions; explains the method by which the research studies were identified and analyzed; examines their characteristics; and outlines limitations relating to the study data. Chapter III presents findings about the effectiveness of developmental education in developing basic skills, improving grade point averages (GPA's), and increasing retention rates, and on other measures of impact. Chapter IV summarizes the general positive trends resulting from developmental education, including: (1) measurable gains in skill development by underprepared students; (2) reduced differences between underprepared and better prepared students as measured by standardized tests; and (3) a general improvement in student GPA's and retention rates following participation in developmental programs. This section also presents a case for developmental education and outlines miscellaneous trends. Finally, chapter V suggests areas for future research and evaluation, focusing on testing methods, follow-up performance of post-developmental students, and cost effectiveness of programs. (HB)