The relationship between a therapist's verbal and nonverbal communication of therapeutic effectiveness was investigated. In a design intended to eliminate many of the methodological problems which exist in this area of research, subjects (N=102) were asked to rate videotaped segments showing combinations of three different levels of both verbal and nonverbal therapist effectiveness. The rating scales used by subjects were the three Carkhuff scales for rating communication of respect, empathic understanding, and facilitative genuineness and a scale derived from the Microcounseling Skill Discrimination Scale. The results indicated that the relationship between verbal and nonverbal communication of therapeutic effectiveness may be additive in nature. (Author)