Evaluation of the Psychometric Properties of a Measure of Child Irrationality

The article describes results from two studies that examined the psychometric properties of a measure of irrational thinking, the Child and Adolescent Scale of Irrationality (CASI), based on the model of REBT. Participants were 1034 children and parents recruited through schools and clinical settings. While the internal consistency of the total scale was quite high, the reliability of the proposed irrational subscales were considerably lower and an exploratory factor analysis failed to yield interpretable factors. Discriminative validity was demonstrated between subjects in clinical settings and school-based subjects on the total scale score and two of the irrational subscales. The total scale score and irrational subscales were correlated with ratings of behavior and emotion, with higher irrationality being correlated with higher levels of emotional and behavioral disturbance. Overall, while problems exist with the factor structure and reliability of the irrational subscales, the CASI appears to adequately measure irrational beliefs. Therefore, it may be clinically useful as a screener when working with children and adolescents.