The Department of Defense (DOD) conducted a two-phase study to determine how scientists and engineers in government and industrial research, development and production activities acquire information for performing work assignments on DOD programs. The Phase I study covered the information needs of DOD personnel engaged in research, development, test and evaluation (RDT and E) activities. Phase II investigated the nation's defense industry to determine its information needs, and the flow of scientific and technical information (flow process) inherent in satisfying those needs. It is based on a representative sample of 1500 individuals from approximately 120,000 scientists, engineers, and technical personnel in 83 organizations in the defense industry. Sixty-three questions were asked them regarding the user of scientific and technical information, his scientific or technical task, his utilization of information centers and services, and the search and acquisition process. The analysis included compilation of frequency distributions for answers to questions and pairs of questions. In addition the qualitative data were transformed into numerical form, and models were specified for relationships among elements of the flow process. The models are estimated from the data by means of regression analysis, to yield significant relationships and factors within the flow process. The Phase II Final Report describes the results of Phase II, and compares them with those of Phase I. It is presented in three volumes. Volume I contains a nontechnical summary of Phase II, including guidelines for management decisions and recommendations for the future.