In his study of the effectiveness of psychotherapy, what was the conclusion hans eysenck

Psychotherapy is a rapidly expanding field; it has been estimated that there are more than four hundred psychotherapeutic approaches. Research evaluating the effectiveness of psychotherapy serves a primary role in the development and validation of therapeutic approaches. Studies have examined the effectiveness of psychotherapy on thousands of patients. Although such studies often produce contradictory and perhaps even disappointing findings, there is clear evidence that psychotherapy is effective.

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