Years of experience, level of qualification, modality delivered, supervision, personal therapy, and continuing professional development are not predictive of client outcomes in psychotherapy. Further, the outcomes of psychotherapy have not improved in over 40 years, despite the proliferation of new therapy modalities. Evidence Based Counselling & Psychotherapy for the 21st Century Practitioner answers how counselling and psychotherapy can be operationalised in the 21st century, dispelling long-held beliefs about how psychotherapy works. Discussing evidence-based practice in its various forms, the chapters provide an analysis of research used and the debate around the effectiveness of specific therapies, commonalities across therapies and the many evidence-based relationship variables that are said to contribute to effective psychotherapy. Client factors and the use of technology, deliberate practice, supervision, and a simulated client case demonstrate the application of the methods and ideas reviewed. Whether a novice psychotherapy trainee or a seasoned practitioner or supervisor, Evidence Based Counselling & Psychotherapy for the 21st Century Practitioner illustrates what an effective 21st century practitioner needs to know, do, and reflect on to improve the effectiveness of their psychotherapeutic work and client outcomes – of interest across the allied health and social care sectors where counselling and therapy interventions are used.