The purpose of this study was to replicate the results of Watson (1967), who reported low, non-significant intercorrelations between some prevalent measures of overinclusive thinking. Three measures of overinclusive thinking (Epstein's test, proverb word counts, and object sorting scores) were administered to 40 schizophrenics and 40 psychiatric attendants. Since groups were equivalent in age, IQ, education, and sex, they were combined for analysis. Low but significant relations held among these overinclusion measures. It was suggested that researchers use more than one measure to determine the presence of this thought disorder. One is cautioned against generalizing across studies based on different overinclusion measures, since the results may be due to differences in test variance rather than to overinclusive thought patterns.
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