A project was conducted to determine whether vocational interest and ability measures can help high school students identify vocational education programs in which they will experience satisfaction and success. Six Career Planning Program (CPP) interest measures and 15 ability measures were administered to 2,101 seniors in 19 area vocational-technical schools. At least 20 satisfied, successful seniors (as determined from student and instructor ratings) were enrolled in each of 24 diverse vocational programs. The 24 programs were grouped into six job clusters similar to Holland's occupational types. Multivariate analyses showed that job cluster differences were statistically significant as well beyond the .0001 level. Generally, students' interest and ability scores were congruent with the content of their vocational programs. About four out of five satisfied and successful seniors would have been referred, by their CPP score report, to the job cluster containing the vocational program they completed. Thus, vocational interest and ability measures appear to have potential for benefiting large numbers of prospective vocational students. (The report contains 57 abstracted reports of research and issues in testing and career guidance and 16 references, in addition to numerous tables and charts and a description of ACT Career Planning Program materials.) (Author/KC)