Prior to Hans Eysenck's controversial 1952 article challenging the efficacy of psychotherapy,

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Prior to Hans Eysenck's controversial 1952 article challenging the efficacy of psychotherapy, proponents of various forms of psychotherapy based their claims on clinical experience and expert consensus, rather than on randomized controlled trials (RCTs). It was only after his article that the need for empirical evidence through RCTs was recognized and subsequently became the gold standard for evaluating psychotherapeutic interventions.

Prior to Hans Eysenck's Controversial 1952 Article Challenging the Efficacy