Abstract
This report concerns the validation of a questionnaire designed to assess social-complexity or the extent to which individuals attempt to join and maintain memberships in a number of diverse groups. Three studies (ns of 118, 63, and 125) attest to the single-factor instrument's internal consistency, test-retest reliability, and validity. In addition, higher scores on the joiners' social-complexity measure were significantly correlated with positive scores on several measures of psychological adjustment. Suggestions for use of the instrument are provided.
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