Predicting interpersonal behavior using the Inventory of Individual Differences in the Lexicon (IIDL)

Personality psychology relies on well-validated measures of individual differences to describe and predict behavior. A newer comprehensive measure, the Inventory of Individual Differences in the Lexicon (IIDL) has been developed, but its ability to predict actual behavior has not been examined. The present article uses the IIDL to predict directly observed behavior, as categorized by the Interpersonal Circumplex (IPC). Video recorded interviews with participants in a laboratory setting were coded for directly observable behavior. Forty-eight IIDL items had meaningful associations with the IPC. Most importantly, 25 items provided unique predictive information above and beyond a factor-level measure of personality. This suggests that comprehensive measures of personality should be considered for their additive validity in predicting interpersonal behavior.