In evaluating the evidence in support of CBT, we will briefly review the evidence from RCTs, meta-analysis, and process-outcome research for CBT for each of a variety of disorders. Each of these kinds of evi- dence has strengths and limitations (Barber, 2009). RCTs are important due to the inference of causality that can be drawn from controlled ex- periments. Meta-analysis allows for the aggregation of RCTs into aver- age effects and in some cases allows for the detection and correction of possible publication bias. Process-outcome findings are important in that a shortcoming of RCTs is that they do not tell you what it is about the treatment that causes the change—such as theoretically relevant techniques or general effects of psychotherapy. Taken together, these differing methodologies will allow for a convergent view of the efficacy of CBT.