Book excerpt: Treatment integrity is the extent to which an intervention is implemented as its originators intended. The book presents the latest thinking on how treatment integrity contributes to evidence-based practice in educational, community, and healthcare settings. Authoritative and up to date, this volume is a much-needed resource for all professionals supervising, providing, or evaluating intervention services, including researchers and practitioners in clinical, counseling, and school psychology; child and adolescent psychiatry; social work; communication disorders; special and general education; program evaluation; and educational leadership.