BRUCE A. THYER, PHD, is a Professor of Social Work at Florida State University. His research has focused on evidence-based practice, evaluation research, behavior analysis, social work theory, and clinical social work. He has cowritten or coauthored over twenty books, including, most recently, A Social Worker's Guide to Evaluating Practice Outcomes, Program Evaluation: An Introduction, Fourth Edition, and International Perspectives on Evidence-based Practice in Social Work.

JOHN S. WODARSKI, PHD,is Director of Research and Professor of Social Work at the University of Tennessee. He has coedited or coauthored over twenty books, including the Handbook of Violence, Essentials of Child Welfare, and The Social Work and Human Services Treatment Planner, all published by Wiley.