This report develops the sample design for evaluating five Federal manpower programs in terms of their effects upon trainees' incomes. The study involves a large 10-city sample of trainees in Job Corps, Neighborhood Youth Corps, Job Opportunities in the Business Sector, and Manpower and Development Act Institutional Training Programs (New Careers was originally included, but later deleted because of its lack of similarity to the other programs). After interviews and tests at the beginning of training, the enrollee will be followed through training and for 12 months afterward. A control group will be interviewed at the same intervals. This report describes the sample design and estimates the necessary sample size for given levels of training. (Author/BH)