Q methodology and control systems theory are jointly employed in a single clinical case involving ineffective interpersonal relationships. A Q sample comprised of 24 adjectives from the Personality Profile Test is administered under 19 conditions of instruction (e.g., describe yourself, mother, ideal mother, et al.), and the Q sorting produces three factors representing classes of interpersonal perceptions. The results are used with the client to discuss strategies for modifying interpersonal relationships with those individuals whom the factors represent.