The value of the output and services produced by students while enrolled in the Job Corps was estimated by analyzing data from a sample of 2 projects from each of 23 Job Corps centers. The projects were subjected to in-depth analysis based on independent-estimate and relative-productivity approaches. The following were among the key findings: (1) in 1 year, more than 1 million student-days are spent on all work projects in the Job Corps, with nearly 80% of student-days spent on vocational skills training (VST) projects and 20% spent on work experience (WE) projects; (2) students produce output worth $5.48 per hour spent on VST projects and $7.01 per hour spent on WE projects; (3) over 1 year, Job Corps students produce output worth more than $27 million while conducting non-center-serving projects, which is equivalent to $789 per student year; and (4) students working on center-serving projects reduce centers' operating costs by an estimated $280-$360 per student year, which is small when compared with the program operating costs of approximately $26,000 per student-year. (Twelve tables/figures are included. The following items are appended: a discussion of the weights used in the study; summaries of the work project studies; and standard errors of the estimates.) (MN)