As Phase IV of a comprehensive evaluation of the NASA-affiliated Langley Research Center's (LaRC) scientific and technical information (STI) program, a study was conducted to assess the usage, importance, and perceived quality of Langley-generated STI among academic and industrial research personnel, and to determine ways in which that information could be made more accessible to potential users. To obtain feedback on the STI program's effectiveness, a survey questionnaire prepared jointly by the evaluation project director and Continental Research was sent to 497 academic and industrial engineers and scientists who agreed to participate in the study. Of these, 381 returned the questionnaires by the deadline, computer tabulations were performed, and the responses were summarized. Analysis of the data revealed that NASA STI was important to the research conducted by the majority of the survey respondents, although a significant lack of familiarity with selected NASA STI products and services among the survey population was indicated. Survey data are categorized by topic and presented in 13 tables. Included are recommendations, a reference list and six appendices, among which are the project plan for the review of LaRC STI services and a copy of the survey instrument. (Author/JL)