Overly broad categories obscure important differences between therapies.

Comments on M. L. Smith and G. V. Glass's (see record 1978-10341-001) meta-analysis of psychotherapy outcome, noting that distortions emerge when the types of therapy under study are organized into 2 "superclasses" of behavioral and nonbehavioral therapies. These groupings ignore important differences among the nonbehavioral therapies, for example, the superior effects of rational-emotive therapy. (PsycINFO Database Record (c) 2010 APA, all rights reserved)