Book excerpt: Here is the first book to offer a clear and coherent account of how group therapy works and of the particular elements of the process that are responsible for its success. The authors have assembled clinical lore, theoretical advances, and empirical research from widely scattered sources to produce a comprehensive, data-rich picture of the ten therapeutic factors that constitute their classification. They also elucidate the implications of this knowledge for general practice. Details of experimental research are given in tabular form. The book will be of great interest to psychiatrists, clinical and social psychologists, social workers, and other professionals who conduct research on groups, or who lead groups and want to learn more about the therapeutic process.