Research on trait descriptions of interpersonal behavior tends to converge on a two-dimensional representation in which descriptive variables are arrayed in a circular fashion around the major axes of affiliation and dominance. Wiggins' self-report adjective checklist (1979) reflects this theoretical ordering. To explore the utility of Wiggins' instrument and model, 72 adults and 97 college students completed the Wiggins Interpersonal Adjective Scale. The order of the adjectives was randomized and subjects were asked to rate how descriptive each adjective was to them. For each sample, maximum likelihood estimates of the population correlation coefficient were computed under the assumptions of circumplexity and these hypothetical latent variables were used to interpret the data. Results from the adult sample indicated that Wiggins' circulant taxonomy of interpersonal behaviors can be extended to adult populations, although deviations from bipolarity were noted. The student sample results, however, indicate that response style factors can play a very strong role with this checklist, even when a general style factor is eliminated. Results suggest that evaluations of circumplex models should consider simple structure models as the most likely alternative. (JAC)