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AbstractTherapist drift occurs when clinicians fail to deliver the optimum evidence-based treatment despite having the necessary tools, and is an important factor in why those therapies are commonly less effective than they should be in routine clinical practice. The research into this phenomenon has increased substantially over the past five years. This review considers the growing evidence of therapist drift. The reasons that we fail to implement evidence-based psychotherapies are considered, including our personalities, knowledge, emotions, beliefs, behaviors and social milieus. Finally, ideas are offered regarding how therapist drift might be halted, including a cognitive-behavioral approach for therapists that addresses the cognitions, emotions and behaviors that drive and maintain our avoidance of evidence-based treatments.Keywords: therapist drift; psychotherapies; evidence-based practice; training; cognitivebehavioral therapy Therapist drift redux 3 Therapist drift redux: Why well-meaning clinicians fail to deliver evidence-based therapy, and how to get back on track There are different reasons why evidence-based therapies might be delivered poorly, such as clinicians being inadequately trained in the therapy in question (e.g., Royal College of Psychiatrists, 2013) or working in a setting that does not permit the implementation of the necessary methods (e.g., not being permitted to provide the necessary number of sessions).Among those reasons is one that is centred in our own practice -therapist drift (Waller, 2009). Therapist drift can be conceptualised as our failure to deliver treatments that we have been trained to deliver, or failure to deliver them adequately, even where resources exist to allow us to do so. Such failure can be a consciously or an unconsciously-driven course of action. Regardless, it has the same consequence -the patient receives treatment that deviates significantly from the evidence-base, reducing their chances of improvement or recovery. This paper will review the substantial recent evidence fo...