Written by a researcher and experienced evaluator, the book begins by outlining the theories and research which frame our understanding of substance misuse, and upon which treatment programs are based. It then examines the principles which should underpin any evaluation, before detailing the practical various steps required to conduct an evaluation, from data collection to outcome measurement. The book shows, too, through detailed and effective evaluation, policy changes can be made and treatment programs improved. Including practical examples of evaluation and assessment throughout, and also assessing the numerous social systems which can support recovery, the book builds to a four-step public health model for establishing sustainable treatment programs. In an era where substance misuse has reached epidemic proportions in the United States and beyond, this book will be essential reading for anyone involved in public health policy and practice in this important area.