In experimental evaluations of health and social programs, the role of dosage is rarely explored because researchers cannot usually randomize individuals to experience varying dosage levels. Instead, such evaluations reveal the average effects of exposure to an intervention, although program exposure may vary widely. This article compares three…

This book is designed as a basic text for gaining an understanding of competency-based education. Part one presents an overview of competency-based teacher education focusing in particular on the instructional component. An outline of the general characteristics of competency-based programs is followed by a summary of the social and historical…