Smith, Glass, and Miller's (1980) meta-analysis showed that client-centred therapy and cognitive-behavioural therapy were the two most effective treatments for psychological disorders.

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Smith, Glass, and Miller's (1980) meta-analysis, often referred to as the "Smith and Glass" study, concluded that psychotherapy is generally effective but did not specifically rank client-centered therapy and cognitive-behavioral therapy as the two most effective treatments for psychological disorders. It provided an overall effect size for psychotherapy but did not declare any specific type of therapy as the most effective.

Smith, Glass, and Miller's (1980) Meta-Analysis Showed That Client-Centred Therapy