UNIACT, a major component of the American College Testing (ACT) Assessment Program, is one of the first interest inventories to employ a new technique for ensuring sex fairness in the reporting of scores. UNIACT was constructed with the goal that distributions of career options suggested to males and females would be similar. It is intended to help junior high school students through adults in the early stages of career planning to identify personally relevant career options. UNIACT reports results for six basic types of vocational interests corresponding to Holland's interest types: science, creative arts, social service, business contact, business detail, and technical. An overview of UNIACT describes the inventory, its historical basis, and interpretive aids. The rationale for sex-balanced interest scores and scales; norming; scale reliability, stability and sex-balance; and the scales' convergent and divergent validity are examined. Criterion-related validity and the scales' appropriateness for minority group members are discussed. Validity evidence includes profiles for over 40,000 persons in 352 educational and occupational groups. Appendices include lists of research reports, the summary profiles, inventory items, scoring procedures, norm tables and the Federal sex-fair compliance statement. (CM)