The longitudinal study was Phase 2 of a study designed to determine the relationship between selection techniques (used by the State of Colorado Civil Service Commission and the Career Service Authority of the city and county of Denver) and on-the-job performance in specified job classifications for personnel classified as (1) Negro, (2) Spanish-surname, or (3) White. Jobs included in the longitudinal analysis were (1) Hospital Attendant at Denver General Hospital; (2) Intermediate Clerk Typist; (3) Clerk Stenographer, Intermediate Clerk Stenographer, and Senior Clerk Stenographer; (4) Clerk Typist, Senior Clerk Typist, and Dictation Machine Operator (all in various State office settings); and (5) Resident Supervisor Trainee at Lookout Mountain School for Boys. Results are presented in graphical and statistical form and indicate no difference in job performance among the 3 ethnic groups. Also, on the paper-and-pencil tests used, the White groups scored consistently higher but mean oral interview ratings were comparable. In most cases where differences were found, there was considerable overlapping of score distributions. Evidence from the study indicates that the relationship between predictor variable and job performance varies from one ethnic group to another. A related document is RC 004 239. (DK)