Client engagement has consistently been associated with positive treatment outcomes in psychotherapy. Engaged clients are more likely to bond [Page 668]with their therapist and report higher levels of satisfaction with therapy in general. Research suggests that a strong working alliance, defined as the strength of the collaborative relationship between the client and the therapist, predicts better treatment outcomes across therapeutic approaches and presenting problems. Although there are many factors to consider, this entry briefly reviews client, therapist, and treatment characteristics that are relevant to the establishment and maintenance of client engagement in psychotherapy.