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The modern paradigm of evidence-based practice dominates the therapeutic world and influences all aspects of the profession. Yet this pervasive concept is based on surprisingly shaky ground. When looked at in detail, the source of the raw data used as the basis of much of this evidence, standardized outcome measures, can be seen to be fundamentally flawed. This article sets out the many methodological, sociopolitical, and technical flaws in standardized outcome measures, and asks what this means for the field of psychotherapy.