I wish I could site the study, but I read it many years ago. It was one of the major studies being touted at the time for showing the effectiveness of CBT. They

I wish I could site the study, but I read it many years ago. It was one of the major studies being touted at the time for showing the effectiveness of CBT. They actually stopped the study at one point to retrain the therapists on CBT. After retraining them they started the study from scratch and through the term of the study constantly evaluated the therapists and provided additional guidance to ensure they were properly applying CBT. What I gathered from the study was that proper application of CBT in the wild was likely to be rare and therefore the effectiveness of CBT in the wild would be limited.