Many current approaches to the treatment of psychological problems focus on specific disorders and techniques that are purported to be effective and distinct. Recent advances in knowledge and theory, however, have called into question this approach. The conceptual framework of transdiagnostic, rather than disorder specific, processes is gaining traction. Alongside this has been the call to focus on evidence-based principles rather than evidence-based practices and techniques. The rationale behind this is that many apparently unique and innovative practices are usually the reflection of...