The interpersonal circumplex was used to categorize patients reporting interpersonal distress into 1 of 4 problem quadrants: Friendly Dominant, Hostile Dominant, Hostile Submissive, and Friendly Submissive. At several points in treatment, therapists assessed their patients' personality disturbances, global functioning, and assets and liabilities for therapy. Patients described their in-session experiences using the Therapy Session Report (D. E. Orlinsky & K. I. Howard, 1975). The 4 problem types each had a coherent and distinctive set of correlates. Patients' interpersonal problems were articulated in therapists' perceptions and evaluations, and in the kinds of interpersonal and intrapsychic themes (wants, hopes, feelings, behaviors, etc.) that characterized patients' retrospective accounts of the therapy sessions. The results add to knowledge about the IIP, interpersonal problems, and the psychotherapy context.Interpersonal problems are the characteristic difficulties that an individual experiences in relating to others and are sources of subjective distress (cf. Homey, 1950;Horowitz, 1994;Leary, 1957), Clearly, interpersonal problems are a major reason that people seek psychotherapy (Horowitz, Rosenberg, & Bartholomew, 1993), and each of the major systems of psychotherapy has, in one way or another, addressed the issue of how best to conceptualize, assess, and classify such problems.The broad purpose of this article is to explore the construct validity of a self-report measure of interpersonal problems, the Inventory of Interpersonal Problems (IIP; Horowitz, Rosenberg, Baer, Ureno, & Villasenor, 1988). As Cronbach and Meehl (1955) pointed out, construct validity efforts serve simultaneously to advance knowledge about particular measures, their referent traits, and-perhaps just as important-the larger, "nomological net" in which those measures and traits are embedded. In this case, the net, or context, is the psychotherapy encounter, as represented in psychodynamic psychotherapy