Robert J. McMahon, PhD, is Professor of Psychology at the University of Washington in Seattle. He is also a member of the Conduct Problems Prevention Research Group and Principal Investigator at the Seattle site of the Fast Track Project, an NIMH-funded multisite, longitudinal investigation of the prevention of early-starting conduct problems in high-risk children. Dr. McMahon has coedited a number of books and serves on the editorial boards of several journals. Rex L. Forehand, PhD, is Professor of Psychology at the University of Vermont and Regents Professor Emeritus at the University of Georgia. He is also Principal Investigator of a CDC-funded parenting project. Dr. Forehand's publications include two coauthored parenting guides. He is a member of 10 editorial boards.