1st Place in Denman Undergraduate Research Forum for PsychologyIn research on the process of change in psychotherapy, perhaps no variable has received more attention than the therapeutic alliance. Measures of the alliance characterize the level of agreement between therapist and client on treatment goals, the level of agreement on how to accomplish those goals, and the affective bond between therapist and client. One of the most widely used measures of the alliance is the 12-item Working Alliance Inventory (WAI-S, shortened version). However, the factor structure underlying the WAI-S remains unclear. Most often researchers have used a total score from the WAI-S, implying a single latent factor. The authors of the WAI-S originally suggested the WAI-S was composed of three distinct factors (i.e., Task, Goal, and Bond). An exploratory factor analysis of the WAI-S in a relatively small sample suggested two factors: Agreement and Relationship (Andrusyna, Tang, DeRubeis, & Luborsky, 2001). To examine the different factor structures proposed, we drew data from three independent samples of depressed patients participating in cognitive therapy for depression. In this combined sample of 207 patients, we used confirmatory factor analyses to compare the fit of the previously proposed one, two, and three factor models of the WAI-S. Using item scores from the third therapy session, our results support a two-factor solution consisting of Agreement and Relationship factors. All fit indices examined favored the two-factor model over competing models. Additional analyses suggest this factor structure applied to ratings of the alliance made by therapists, clients and observers. Our results clarify the factor structure of the WAI-S and should inform future research on the therapeutic alliance.A five-year embargo was granted for this item.Academic Major: Psycholog
