A 3-stage interpersonal model of the successful therapeutic process (high complementarity, low complementarity, high complementarity) has been proposed and supported in the literature. However, recent work on the interpersonal circumplex and its definition of complementarity have called into question the validity of this model. A revised conception of the stage model is proposed. This revision takes into account the moderator variables of social norms and roles, differential interpretation of hostile and friendly behaviors, manifest versus latent communication, and individual differences in adjustment. The revised model differentiates the middle conflict stage into 2 substages: the dissatisfaction substage, characterized by high negative (hostile) complementarity, and the unstable substage, characterized by low complementarity. Interpersonal models of counseling and therapy focus not on the content of treatment dialogue but on the process of the treatment itself. The issues discussed are less important than how the two participants interact around them. Interpersonal models assume that the negotiation of the therapeutic relationship is central to treatment (Carson, 1969; Kiesler, 1982). Thus the focus is placed on how clients negotiate with others to establish relationships to meet their needs. Treatment involves the delineation and alteration of clients' relationship negotiation styles. The primary construct used in conceptualizing the therapy process is complementarity, the extent to which the behaviors of the participants fit with or complement each other. The purpose of this article is to review the current interpersonal models of the counseling process, to integrate these models with the research on complementarity, and to propose a revised version of the relationship negotiation view of the therapeutic process. In interpersonal models, successful therapy has been viewed as a three-stage process involving (a) the establishment of a complementary relationship (rapport establishment); (b) the removal of inappropriate (i.e., in keeping with the client's rigid behavioral pattern) complementary interactions (conflict stage); and (c) the establishment of a new, healthier complementary interaction (Dietzel & Abeles, 1975; Kiesler, 1982; Tracey, 1985, 1986a, 1987; Tracey & Ray, 1984). Rapport is accomplished by the therapist adhering to the client's definitions of the relationship, resulting in high levels of complementarity. Then the therapist slowly moves away from the predominantly client-defined relationship (conflict stage; lower levels of complementarity) until the client adopts new, more productive methods of negotiating the relationship with the therapist. In the ending stage, a new, higher level of complementarity (resolution) that re