We acknowledge the contributions of colleagues at the Baltimore City Public Schools and at Johns Hopkins University for their support of this research. The Prevention Program is a collaboration between the Baltimore City Public Schools and the Prevention Research Center of the Department of Mental Hygiene, The Johns Hopkins University School of Hygiene and Public Health. The work of the Prevention Program would not have been possible, let alone successful, without the active participation and continued support of the leadership, faculty, and staff of the School District and their guidance in our research and service enterprise. We are especially grateful for the support of Alice Pinderhughes, former Superintendent of Baltimore City Public Schools, Leonard Granick, former Staff Specialist for Testing; Craig Cutter, former Staff Director, Department of Education; Ray Byrd, formerly of the Baltimore City Department of Planning; and the principals and teachers who collaborated in this research. We acknowledge the thoughtful reviews and comments of Hendricks Brown, Larry Dolan, George Rebok, Jon Rolf, and Jim Anthony. We also acknowledge a number of people who provided crucial technical support to this research: Dale Hood, Elaine Delman, Laura Tivoli, and Judith Cuthie. The study on which this paper is based has been supported by the following grants: National Institute of Mental Health (NIMH) Grant 5T32 MH14592, Psychiatric Epidemiology Training Grant; and NIMH Grant P50 MH38752, Epidemiologic Prevention Center for Early Risk Behavior.