The purposes of this study were to collect and analyze manpower and production data from 19 countries and to test the relationship between the occupational composition of an industry and the production of that industry. Volume I presents the research methodology, explains the correlations which were used, describes the data and its collection difficulties, and makes an explanation of the occupational and industrial classification systems. A how-to-do-it manual describing the steps necessary to make manpower requirement projections from the given data is included. The appendixes include: (1) 26 summary tables giving the occupational composition of industrial sectors for 19 countries, (2) cross indexes for industry titles and occupational titles of the International Manpower Study and the International Standard Industrial Classification, and (3) the authors' standard industrial code used in this study. Data tables from the study are available in Volume II (VT 005 772). (EM)