The Denver Public Library (DPL) conducted a market analysis of its success in meeting the information needs of three segments of the population of Denver, Colorado: households, business firms, and city government and quasi-government agencies. Information was sought on current DPL usage and nonusage practices of these three groups, their levels of awareness and attitudes toward the DPL system, and their principal information needs and sources. The project's data collection phase consisted of three surveys conducted concurrently between February and June 1974. Personal interviews were conducted in a sample of households, while questionnaires were mailed to businesses and government agencies. The data analysis phase of the project produced a number of recommendations for specific actions by the DPL to make the system more responsive to its current and potential users. The bulk of this report consists of presentation and analysis of the survey responses of the three population segments under study. (Author/SL)