The Triadic Effect: Associations Among the Supervisory Working Alliance, Therapeutic Working Alliance, and Therapy Session Evaluation

Several theorists (Bandura, 1969; Hackney & Goodyear, 1984; Searles, 1955) suggest parallels between the relationship in supervision and the relationship in therapy. We examined supervisor and therapist trainee ratings of supervisory working alliance (SWA) in 1 week predicting client-rated therapeutic working alliance (TWA) and client-rated therapy session evaluation (TSE) in the following week as well as TWA and TSE ratings in 1 week predicting SWA ratings in the following week. Our data included 663 weeks of therapy nested within 28 trainees nested within 15 supervisors, disaggregated into differences between supervisors, differences within supervisors, and differences within trainees. At the between-supervisor level, when supervisors' trainees rated the SWA higher on average compared with other supervisors' trainees' average SWA ratings, their clients' average TWA rating was higher. In contrast, when supervisors rated the SWA higher on average compared with other supervisors' average SWA ratings, their trainees' clients' average TSE rating was higher but the average TWA rating was lower. At the within-supervisor level, when trainees rated a higher SWA on average compared with other trainees' average SWA ratings with the same supervisor, their clients' average TSE rating was higher. The theoretical prediction of parallel relationships in supervision and therapy was supported, but only for between-supervisor and within-supervisor differences in SWA. We found no evidence that week-to-week changes in SWA or client-rated TWA or TSE reflected parallel relationships. We provide suggestions for further research, including exploring the mechanisms through which supervision relates to the therapy process and outcome. Public Significance Statement This study provides preliminary evidence for the link between supervision and the psychotherapy process and outcome. In general, our results suggest that some supervisors form stronger alliances with their trainees, and the clients of those trainees report stronger alliances and better session quality. Hence, some supervisors are more effective than others at developing alliances with their supervisees, and this effectiveness is linked to a better client-perceived therapy process and outcome.