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For many decades, the question of the evaluation of psychotherapy has shaken up the world of research. From studies led up until now, a certain number of conclusions and perspectives have emerged. Louis Georges Castonguay, professor at the Department of Psychology of Pennsylvania State University, is one of the leading figures in this field. For many years, he has been working on updating psychotherapeutic processes and their underlying principles. In this interview, he presents the main data collected by the scientific community that can inspire the psychotherapists of today and tomorrow.