The Alliance-Outcome Association in Couple Therapy: A Common Fate Model.

The working alliance has been shown to be a robust predictor of couple therapy outcomes. However, there are still questions regarding the best way to conceptualize and analyze the association between the alliance and outcomes in the couple therapy context. This study presents results from a relatively novel analytic approach for evaluating the alliance and therapy outcomes via the shared influence model (i.e., common fate statistical methodology) with 93 couples who had at least three sessions. Examining the alliance in couple therapy this way allows for nuance in conceptualizing the process of the alliance among partners and the therapist in couple therapy. Empirically, the question that remains is whether the shared experience of the alliance between partners is a stronger predictor of therapy outcome as compared to the unique individual experiences of the alliance. This approach has not yet been utilized to model the couple alliance-outcome association. Results revealed that the shared influence model demonstrated a significant association between the alliance and therapy outcome. Specifically, the couple-level alliance construct was adequately represented from the partners' alliance ratings with the therapist, and couples that report higher shared alliance experiences were also likely to have better therapy outcomes. These findings suggest that conceptualizing and analyzing the alliance at the couple level may be strongly advantageous. Implications for research and practice are provided.