"At the root of many controversies surrounding therapy is one key question: What works? Is efficacy based on the singular curative powers of specialized techniques, or do other variables account for patient change? This book proposes the answer, which is not to be found in the languages, theories, or procedural differences of the field's warring camps. Instead, the answer lies in pantheoretical, or common factors - the ingredients of effective therapy shared by all orientations.". "The editors have assembled some of the best researchers and practitioners in the field today to analyze the extensive literature on common factors and to offer their own evaluations of what those data mean for therapy, therapists, and consumers."--BOOK JACKET.