Methods for evaluating vocational interest structural hypotheses

We critically review Holland's structural hypotheses to provide a framework for discussing the task of evaluating vocational interest models. Two forms of Holland's RIASEC model are proposed and the predictions from these models are specified. Holland's circular order model and circumplex structure are then evaluated to demonstrate Hubert and Arabie's randomization test of hypothesized order relations and confirmatory factor analysis. These models and methods are illustrated with two RIASEC correlation matrices based on the Unisex edition of the ACT Interest Inventory. Finally, we briefly discuss issues of model comparison and methods to integrate the empirical literature on interest structure.