SELECTIVE DISSEMINATION OF INFORMATION IN PRACTICE. SURVEY OF OPERATIONAL AND EXPERIMENTAL SDI SYSTEMS
OFFICE OF AEROSPACE RESEARCH ARLINGTONVA
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The primary purpose of the report is to present an overview of the operational and experimental systems established for the selective dissemination of scientific and technical information. Secondarily an attempt was made to identify the trends which may shape the future development of the selective dissemination procedures. The report is based in part on the existing SDI literature and in part on the results of two recent surveys. The combined results indicate that there are approximately 45 SDI systems in various stages of operation, serving an approximate population of 30,000 users. The largest system processes as many as 30,000 entries per month, while the smallest runs no more than 150. AEC, NASA and DOD are the three largest processors. Operating costs are in the vicinity of 100 per user per year. The user satisfaction is high. This satisfaction correlates positively with the degree of literature coverage. There seems to be no correlation with the precision of matching. The observable trends are toward the efforts of capitalizing on products from large systems, toward an increased use of group profiles and toward commercial subscription services.
- Information Science