Over 1,250 users of 10 major on-line bibliographic information retrieval services were surveyed to assess the impact of such services on the library and information science community and its user community. The major topics considered in analyzing responses were: (1) respondent backgrounds; (2) methods of acquiring and promoting on-line services; (3) selection and training of staffs; (4) levels of use; (5) selection, access, and use of on-line systems; (6) selection and use of data bases; (7) costs; (8) major problems; and (9) major areas of impact. It was found that the services are being used primarily by libraries and information service centers in commercial organizations, universities, and federal government agencies. Searchers are primarily information intermediaries--librarians and information specialists. The use of search services is generally considered cost-effective. The steady growth of these services will mean increased pressure for the development of the following services: (1) accommodation for a wide range of user expertise within the search systems; (2) new methods and wider availability of user training; (3) methods for recovering the costs of retrieval service withing traditionally no-fee institutions; and (4) faster methods of acquiring full-text copies of materials indexed. (Author/PF)