Book excerpt: This book provides current information about the many recent contributions of social systems theory. While some sociologists feel that the systems age ended with functionalism, in reality a number of recent developments have occurred within the field. The author makes these developments accessible to sociologists and other non-systems scholars, and begins a synthesis of the burgeoning systems field and mainstream sociological theory. The analysis shows not only that important points of rapprochement exist between systems theory and sociological theory, but also that systems theory has in some cases anticipated developments needed in mainstream theory.