Modern mental health care is increasingly focused on medication and patient management, but solid evidence supports the value of "talking therapies," and several contributors to this compact volume observe that their number now exceeds 400. Are they all distinct treatments or merely variations on a few core modalities? Is the structure of each only an epiphenomenon that conceals a common unifying principle? The psychologists who contributed to this book argue that innovative therapies combine two or more disciplines to form worthwhile new entities. For example, Power compares the multiplicity of therapies to diversity in linguistics: although several thousand languages exist, and each is "impenetrable" to those who speak a different tongue, they all share a common framework of grammatical rules. By analogy, all therapies are based on a common foundation—the therapeutic alliance and other nonspecific factors—to which each approach adds its own particular methodology. The value of integrative therapies may be their application to areas not previously accessible as well as the augmentation of separate approaches when used in concert with others.