A study was designed to identify the main ways that clients perceive their psychotherapists. An inventory of 65 statements was constructed to measure 8 postulated interpersonal behavior patterns. The inventory was administered to 523 patients in treatment for at least 3 mo. A factor analysis disclosed 5 dimensions of perceived therapist behaviors. The dimensions were labeled Accepting, Understanding, Authoritarian, Independence-Encouraging, and Critical-Hostile. The findings were shown to be consistent with constructs proposed by Fiedler, Apfelbaum, and Rausch and Bordin. Patient and therapist ratings of improvement were found to relate significantly to therapist Acceptance and Understanding. (PsycINFO Database Record (c) 2006 APA, all rights reserved)