Conceptualizing the subject matter of interpersonal behavior was the primary objective of this study. Researchers administered version three of Lorr and McNair's Interpersonal Behavior Inventory (IBI) to 507 undergraduates at Cleveland State University. The first group received three copies of the IBI and were asked to rate themselves, rate a person liked, and rate a person disliked. The second group completed only the "self" rating, and the third group filled in only the "best liked others" section. The "self" and "best liked others" responses were analyzed. Results suggest that while the IBI instrument can be used effectively in interpersonal communication and assessment, it ought to be revised to emphasize the domain of interpersonal behavior. (DS)