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The Efficacy of Rational Emotive Therapy: A Quantitative Review of the Outcome Research. One explanation of the differences is that while RET studies used reactive measures of irrational beliefs, they also included less reactive measures of adjustment, such as locus of control,and anxiety measures. The net outcome was that the average reactivity for the present analysis was lower than in the previously mentioned quantitative reviews. Given the previously mentioned limitations to the present quantitative review, these results suggest that RET is an effective form of therapy. Compared to baseline assessments, and control groups, those individuals receiving RET demonstrated significant improvement. These results do not support the Zettle & Hayes (1980) conclusion that there is little evidence for the clinical efficacy of RET. In contrast, RET was shown to be an effective form of therapy. Perhaps it is time to stop the needless and inefficient discussion of the efficacy of this therapy. Rather, a better focus of investigations and reviews would be to determine which factors, or combinations thereof contribute most to the effectiveness of RET.