The Family System Test (FAST), developed by Thomas M. Gehring, is an important new tool for investigating family relations. Based on the structural-systemic theory of families, it is a figural technique for representing emotional bonds (cohesion) and hierarchical structures in the family or similar social systems. In this unique volume, the editors draw on current theory and research in family or similar social systems together with a variety of empirical studies that have used the FAST, to provide a comprehensive overview and assessment of the test and its use in various clinical research contexts. The book is divided into four sections, each focusing on a different aspect of the FAST. Part 1 describes the concepts and psychometric properties of the FAST within the context of theoretically and empirically relevant aspects of the field of family psychology as a whole. Special emphasis is given to systematic-structural approaches to assessing individual and family functioning. Part II focuses on the use of the FAST in developmental research. For example, the the FAST has been used to show how family constructs are influenced by age, type of family and situation. Part III deals with cross-cultural issues and compares the interpersonal constructs of Japanese and Chinese families to Western families. Finally, Part IV addresses the applications of the FAST in clinical setting - in diagnosis of biopsychosocial problems and planning and evaluation of clinical interventions. The result is a book that helps to bridge the gap between theory, practice and research. It will be essential reading for users of the FAST and all clinicians and researchers who work in family relations and development.