H.A. CHRIS NINNESS is Assistant Professor in the Department of Counseling and Special Education-School Psychology Program at Stephen F. Austin State University. He will be a Post-doctoral fellow at the Kennedy Krieger Institute and The John Hopkins University School of Medicine as of September 1993. He is co-author of Applied Behavior Analysis and School Psychology (Greenwood, 1988). SIGRID S. GLENN is President of the Association for Behavior Analysis and Associate Professor and Director of the Center for Behavior Analysis at the University of North Texas. She is the co-author of Applied Behavior Analysis and School Psychology (Greenwood, 1988), Introduction to Behavior Analysis and Behavior Modification (1978), and Introduction to the Science of Psychology (1976). JANET ELLIS is Assistant Professor at the Center for Behavior Analysis at the University of North Texas. She has written for American Psychologist, Behavior Analysis and Social Action, and Journal of Offender Rehabilitation.