Abstract

Clinical research is difficult. It confronts massive heterogeneity in its participants, who are real people bumping around the world in complex ways. Clinical research in psychology is doubly difficult, since it tries systematically to study conditions that are inherently difficult to systematize. In their thoughtful and closely argued article, Truijens et al. emphasize these difficulties, and describe a novel challenge to psychotherapy research: that the support for many evidence-based therapies is weaker than previously recognized because it relies on patient-reported outcome measures that often yield invalid results. Despite the initial plausibility of their position, however, their...