This book presents a lively retrospective account of a career as an inner and outer in American government and academe by a social scientist who has spent many years conducting evaluation studies of what works - and what doesn't work - in domestic public affairs. The book uses rich histories of prominent policy issues and descriptions of major studies of welfare and job programs to bring to life crucial questions about how social science can best serve social policy. This is a new, substantially updated, and expanded version of a book published by Basic Books a decade ago. Richard P. Nathan writes about the real politics of social science research in a style intended to appeal to practitioners and students of American government. Reviewing the earlier version of this book, James Q. Wilson said Nathan "summarizes in plain English what he has learned about how to evaluate public policy. It is an important book for a political system that may have wearied of adopting programs simply because they make us feel good or serve ideological ends." Robert Reischauer commented, "Nathan's book is essential reading for policymakers who must look for ways to identify efficient government programs." Richard P. Nathan is director of the Nelson A. Rockefeller Institute of Government.