This book results from a research program on which I have spent most of my time since 1974. It addresses two of the major problems facing social system account ing: how to measure and account for nmarket activities and how to combine social and ecomic indicators. The solution I propose is accounts based on behavior settings, a concept originated by Roger G. Barker more than thirty years ago. Behavior settings are the natural units of social activity into which people sort themselves to get on with the busi- ness of daily life--grocery stores, school classes, reI i- gious services, meetings, athletic events, and so on. The descriptive power of behavior settings has been established in surveys of complete communities in the United States and England, of high schools ranging in size from fewer than 100 to more than 2000 students, of rehabilitation centers in hospitals, and of several other types of organizations. Behavior settings are empirical facts of everyday life. A description of a community or an organization in terms of behavior settings corresponds to common experi- ence. In many cases, small establishments are behavior settings; the paid roles in behavior settingsare occupa- tions; and the buildings and equipment of establishments are the buildings and equipment of behavior settings.