| List of Illustrations | |
| Preface | |
| Introduction | |
| Ch. 1 | Progress and Confusion | 3 |
| Ch. 2 | Barriers to Accumulation | 22 |
| Ch. 3 | The Rise and Decline of the Group Approach | 44 |
| Ch. 4 | Collective Action and the New Literature on Interest Groups | 64 |
| Ch. 5 | Bias and Diversity in the Interest-Group System | 83 |
| Ch. 6 | The Dynamics of Bias | 100 |
| Ch. 7 | Building a Literature on Lobbying, One Case Study at a Time | 120 |
| Ch. 8 | Surveys of Interest-Group Activities | 147 |
| Ch. 9 | Learning from Experience | 168 |
| Appendix | Articles on Interest Groups Published in the American Political Science Review, 1950-1995 | 189 |
| References | 197 |
| Index | 217 |