A theoretically-derived, easily employable, and widely applicable coding system for processing analysis of small group discussions is described. The system was constructed from established social influence theory, and pilot results from application of the system to group therapy interactions were presented. Eighty percent of all group communications were found to be either influence-related or direct influence attempts. Influence-related probes, disclosures, and reinterpretations were employed significantly more by both therapists and patients than overt or manipulational influence categories. Therapists, however, used influence-related communications less than did their patients. No sex differences in influence usage were disclosed. (Author)