Evaluates the third edition of the Occupational Aptitude Survey and Interest Schedule, designed to assist students in eighth grade through postsecondary school settings in self-exploration, vocational exploration, and career development. Concludes that the OASIS-3 provides time- and cost-effective methods for assessing a number of abilities and interests in students who may be uncertain of their academic or vocational potential. (Contains 14 references.) (GCP)