In this age of evidence-based practice, it is fitting that the book begins with two chapters dedicated to reviewing the statistical and epidemiologic bases for evaluating and comparing psychotherapeutic treatments. A meta-analysis of the relative effect size of each of the therapies described in the book are presented, which allows for a comparison among treatments. On the basis of this meta-analysis, the author determines that the biggest effect sizes are found for treatments such as Beck's cognitive-behavioral therapy, hypnotherapy, and modeling. The nontraditional and less mainstream therapies, such as Adlerian psychotherapy and transactional analysis, have smaller effect sizes. Treatments such as short-term dynamic psychotherapy and reality therapy do not appear to be efficacious at all.