A study conducted in Illinois determined how or if decision-makers actually used the results of a community problems needs assessment survey ("Illinois: Today and Tomorrow") of 15,000 persons in the state. Data for the use study were collected from sixty in-depth personal interviews with randomly selected cooperative extension advisors and administrators, state legislators and legislative research staff members, and state agency managers. Forty of the respondents used the results of the needs assessment, either directly or as background information, on issues of concern to them. Results show that the decision makers were most likely to use such sociological research when (1) the research information is perceived as the best data available; (2) the information confirms an already-held position; and (3) the research information fits with job-related informational needs. The results also suggest that timing, dissemination techniques, initial involvement in planning for the study, and explanation of the study results are factors that affect use of information about public opinion. (Author/KC)