Leonard Bickman, Ph.D., is Professor of Psychology, Psychiatry and Public Policy. He is director of the Center for Evaluation and Program Improvement and Associate Dean for Research at Peabody College. He earned his Ph.D. in psychology (social) from the City University of New York, his masters degree in experimental psychopathology from Columbia University and his bachelors from the City College of New York. Professor Bickman is a nationally recognized leader in program evaluation and mental healthservices research on children and adolescents. He has published more than 15 books and monographs and 180 articles and chapters and has been principal investigator on over 25 major grants from several agencies. He is co-editor of the Applied Research Methods Series published by Sage Publications since 1980. He is also co-editor of the Handbook of Applied Social Research and is collaborating on a new International Handbook of Social Research. He is the co-author of the very popular book Applied Research Design: A Practical Guide.

PART ONE: VALIDITY ISSUES
Towards a Practical Theory of External Validity - Thomas D Cook
Paul Wortman, Elvira Elek-Fisk and Lanette Raymond
Validity Applied to Meta-Analyses and Research Syntheses
Discriminative Validity - Norman Miller, William C Pedersen and Vicki E Pollock
Statistical Conclusion Validity for Intervention Research - Mark Lipsey
A Significant (p 05) Problem
Effect Sizes in Behavioral and Biomedical Research - Robert Rosenthal
Estimation and Interpretatio
Realism, Validity and the Experimenting Society - Melvin Mark
PART TWO: SOCIAL EXPERIMENTS
Toward the Dream of the Experimenting Society - Robert G St Pierre and Michael J Puma
The Honestly Experimenting Society - Robert Boruch and Ellen Foley
Sites and Other Entities as the Unit of Allocation and Analysis
Rival Explanations as an Alternative to Reforms as Experiments - Robert K Yin
Donald T Campbells Contributions to Practical In the Trenches Program Evaluation - Burt Perrin
The Experimenting Society in a Political World - Carol H Weiss