Foreword / Michael J. Malbin -- I. Introduction. Ch. 1. Applying Social Science to Government. Ch. 2. Optimism and Disillusionment -- II. Demonstration Research. Ch. 3. The Nature of Demonstration Research. Ch. 4. Hurdles of Demonstration Research. Ch. 5. Welfare Demonstration Studies -- III. Evaluation Research. Ch. 6. The Nature of Evaluation Research. Ch. 7. Evaluating the California GAIN Program. Ch. 8. The 1988 and 1996 National Welfare Reform Laws. Ch. 9. Evaluating the Family Support Act of 1988 / Richard P. Nathan and Irene Lurie. Ch. 10. Evaluating the Personal Responsibility Act of 1996 / Richard P. Nathan and Thomas L. Gais. Ch. 11. Lessons from Evaluations of Employment and Training Programs. Ch. 12. The Beginning of the Field Network Evaluation Methodology -- IV. Conclusions. Ch. 13. Public Policy and Policy Research: Limits and Possibilities