The report presents the methodology used by the National Planning Association (NPA), under contract to the Federal Energy Administration (FEA), to estimate direct labor usage coefficients in some sixty different occupational categories involved in construction, operation, and maintenance of energy facilities. Volume 1 presents direct labor usage coefficients estimated from industry surveys and also a detailed breakout and recapitulation by occupation and energy sector, of the computed total direct labor requirements based on the NPA coefficients and activity levels specified in a trail FEA scenario for energy development through 1977, 1980, and 1985. Volume 2 part A contains coefficients for the following industries: petroleum, natural gas, nuclear energy, and synthetic fuels. Volume 3 presents a comparison of direct labor usage coefficients for construction and operation and maintenance of energy activities estimated from industry surveys by the NPA with coefficients estimated by task forces established by the FEA for its Project Independence Report of November 1974. (NTIS)