This article explores the validity and reliability of Crockett's (1965) Role Category Questionnaire (RCQ) measure of cognitive differentiation as a predictor of communication ability. The RCQ is a “free response” measure that has been shown in previous research to be a valid indicator of social cognitive and communication abilities. This review concludes that the RCQ may prove especially useful in exploring and predicting individual differences in managerial writing, presentation, and interpersonal communication in organizations.
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