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Alliance ratings of single significant sessions of cognitive-behavioral and psychodynamic-interpersonal therapies were compared using the observer form of the Working Alliance Inventory (WAI-O). Eighteen cognitive-behavioral and 13 psychodynamic-interpersonal therapists, nominated by experts in the field, participated in the study. Results indicate significantly higher total alliance scores for cognitive-behavioral sessions, and greater variability in alliance for psychodynamic-interpersonal sessions. In addition, SCL-90 scores were negatively correlated with the alliance solely in psychodynamic therapy, indicating that more symptomatic patients may have greater difficulty with the work required in this kind of therapy.
Raue et al. (1993) studied this question.