Assessing intervention competence and its relation to therapy outcome: A selected review derived from the outcome literature

The assessment of intervention competence possesses an obvious relevance for practitioners and clinical scientists alike. It is often assessed as part of the evaluation of treatment integrity in clinical research in general, and in randomized clinical trials (RCTs) in particular. The authors first attempt to add clarity to the concept and better differentiate intervention competence from closely related constructs. Next, the authors review and evaluate the main measures of therapist competence used in RCTs, relying on this conceptual foundation to provide suggestions for future measures. The empirical literature on the relation between therapist competence and clinical outcome is then reviewed. The relation, while positive, is weaker than expected, and factors having a potential bearing on this are discussed. The authors then recommend that new measures be created and that the assessment of limited-domain competence be supplemented by explorations of global competence. Due to the potential ramifications for the field, the authors also recommend that caution be exercised in the task of operationally defining competence.