Abstract

With its focus on evidence, psychology has grown into a mature, professional, and scientifically supported practice over the last decades. In general, psychotherapy and psychological counselling have shown to be more efficacious than waiting it out and a staggering 350 specific treatments have been scientifically supported as effective. Although, evidencebased treatments seem to work equally well, not all people benefit from evidence-based treatments, and it often remains unclear why. This raised the field-wide concern of what works for whom and sparked a wealth of research on specific ingredients, common factors, process factors, and intra- and...