This study examined the relation between vocational interests and job congruence and (a) stability at work and (b) supervisors' evaluations. Congruence scores were based on a comparison between interest scores, as measured before employment, and occupational field after 1 year. Significant correlations (.19 to .31, n = 774) were found between congruence and job stability (persistence) and between congruence and performance (.09 to .27, for 90 males employed in the Business or Technology occupational fields), but not among 51 employed in the Organization field. Differentiation was found to make a negligible contribution in predicting stability and performance evaluations. The findings are discussed in light of the size of the correlation coefficients, the diversity of the Organization field, the Courses Inventory as a means for measuring vocational interests, and the method of measuring congruence differentiation.Holland's (1973, 1985) congruence hypothesis claims that &dquo;vocational satisfaction, stability, and achievement depend on the congruence between one's personality and the environment in which one works&dquo; (1985, p. 10). In order to measure this congruence, both personalities and environments are classified into six main types: Realistic, Investigative, Artistic, Social, Enterprising, and Conventional. Spokane (1985) and Edwards (1991) reviewed dozens of congruence studies aimed at examining Holland's congruence hypothesis. A meta-analysis performed by Assouline and Meir (1987) found that the mean correlations between congruence and satisfaction, stability and achievement were .21 (53 correlations, n = 9041), .15 (17 correlations, n = 11,855) and .06 (7 correlations, n = 1331), respectively.Assouline and Meir noted that in the various studies, stability and achievement were measured, almost exclusively, in the education system, comparing students' intentions or plans for future studies to their actual major field of study or college grades (e.g.