This first volume reporting the results of a study of duplications and gaps in public skill training programs in 20 major American cities was conducted by the National Planning Association under the U. S. Office of Education at the request of the National Advisory Council on Vocational Education. The report contains both a summary of findings for the 20 cities (Volume I) and a series of individual city reports (Volume II). Limited to programs which are publicly funded and provide formal classrooms with institutional training, this study covers over 390,000 enrollees, often served by vocational skill centers. The data suggest: (1) Federally funded facilities operated by public education systems could provide opportunities for skill training for those not otherwise served; (2) A need exists for increased administrative coordination; (3) Some overlap between educational institutions and manpower agencies is apparent; (4) The existence of substantial gaps for out-of-school groups, especially teenagers can be seen; (5) Whites were concentrated in post-secondary institutions, while the enrollment of blacks was distributed equally; and (6) Frequent duplications of training for occupations for which there is a surplus of workers need improved program coordination and better planning in relationship to the labor market, necessitating training services for program administrators and the provision of technical assistance. Numerous tables present the data. (Author/AG)