It is a basic tenet of rational emotive and other cognitive restructuring psychotherapies that irrational belief systems are relatively stable constructs. The present study investigated this premise by examining the 10-wk. test-retest reliability of the Rational Behavior Inventory, a well-documented measure of irrational beliefs, employing a sample of 74 undergraduates. Correlations between scores for the first and second administrations of the inventory were moderate to high, and significant. There were no significant differences in scores taken at the beginning and end of 10 wk. These data confirm that irrational beliefs exhibit temporal stability.
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