The therapy process observational coding system-alliance scale: measure characteristics and prediction of outcome in usual clinical practice.

The authors describe psychometric characteristics of the new Therapy Process Observational Coding System-Alliance scale (TPOCS-A; B. D. McLeod, 2001) and illustrate its use in the study of treatment as usual. The TPOCS-A uses session observation to assess child-therapist and parent-therapist alliance. Both child and parent forms showed acceptable interrater reliability and internal consistency; when applied to cases treated for internalizing disorders, both forms were associated with youth outcomes. Child-therapist alliance during treatment predicted reduced anxiety symptoms at the end of treatment. Parent-therapist alliance during treatment predicted reduced internalizing, anxiety, and depression symptoms at the end of treatment. The findings held up well after confounding variables were controlled, which suggests that both child-therapist and parent-therapist alliance play key (and potentially different) roles in the outcome of treatment as usual.