Selective dissemination of information

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Short description: Library and information science alerting method


Selective dissemination of information (SDI) is a library and information science method for notifying users about newly available documents or records that match their stated interests. SDI systems use stored interest profiles, keywords, subject terms, and document abstracts to route new information to researchers, engineers, clinicians, and other users.[1][2]

The method was proposed by Hans Peter Luhn of IBM in the late 1950s as part of early work on automated information processing and business intelligence.[3] SDI later became used in research organizations, government laboratories, corporate libraries, and academic libraries as a computerized current-awareness service.[1][4]

History

The concept of SDI is usually traced to Luhn's 1958 paper "A business intelligence system", which described an automatic system for distributing information to users or organizational units according to stored interest profiles.[3] Luhn's proposal responded to the growth of scientific and technical literature after the Second World War and treated dissemination as a counterpart to document retrieval: rather than a user searching a document file, a new document was matched against a standing file of user interests.[1]

In a 1963 state-of-the-art review, C. B. Hensley described SDI as a rapidly developing field and documented operational systems that matched newly received documents against stored interest profiles.[1] At the U.S. Army Signal Corps Laboratories at Fort Monmouth, SDI software routed abstracts to scientists and engineers based on interest profiles. Similar services were later developed in libraries, government agencies, and industrial research organizations.[1][5]

Academic libraries also adopted SDI as a service for scientists and researchers. A 1967 article in College & Research Libraries discussed SDI in the academic science library, reflecting the method's movement from government and industrial research settings into university library services.[4] J. H. Connor's 1967 review in The Library Quarterly surveyed the literature and issues surrounding SDI, including profile construction, user needs, and the role of librarians and information specialists.[2]

Method

An SDI service begins with a user profile describing a person's research interests. Profiles may include keywords, subject headings, classification terms, author names, organizations, or other search criteria. When new documents, citations, or abstracts enter the system, they are compared against the stored profiles. Matching records are then distributed to users as current-awareness notices.[2]

Early SDI services often required librarians or information specialists to interview users and construct detailed interest profiles. The quality of the profile affected both recall and precision: overly broad profiles produced irrelevant notices, while overly narrow profiles missed useful material.[2][5]

Computerized SDI systems reduced some of the labor involved in scanning new literature, but they did not eliminate professional judgment. Profile design, vocabulary control, indexing quality, and feedback from users remained important to the usefulness of the service.[2]

Relationship to current-awareness services

SDI is closely related to current-awareness services, but the terms are not identical. Current-awareness services broadly inform users about recent publications or acquisitions, while SDI refers more specifically to selective notification based on an individual or group profile.[2] Britannica describes SDI as a library service in which librarians search databases for new material matching a patron's interest profile and forward the results to that patron.[6]

Legacy

Although the term SDI is less common in contemporary public-facing software, the underlying model remains recognizable in library databases and research platforms that compare new records against stored profiles or saved searches. Modern database alerts, saved searches, email alerts, RSS feeds, and citation alerts perform a similar current-awareness function, while usually using newer search interfaces and electronic delivery methods.[6][7]

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Hensley, C. B. (1963). "Selective dissemination of information (SDI): state of the art in May, 1963". AFIPS '63: Proceedings of the May 21-23, 1963, Spring Joint Computer Conference. pp. 257-262. doi:10.1145/1461551.1461584. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Connor, J. H. (1967). "Selective dissemination of information: review of literature and issues". The Library Quarterly 37 (4): 373-391. 
  3. ↑ 3.0 3.1 Luhn, H. P. (1958). "A business intelligence system". IBM Journal of Research and Development 2 (4): 314-319. doi:10.1147/rd.24.0314. 
  4. ↑ 4.0 4.1 Kolder, Hansjoerg; Simpkins, Irwin F. (January 1967). "Selective dissemination of information and the academic science library". College & Research Libraries (Association of College and Research Libraries) 28 (1). https://hdl.handle.net/2142/38082. 
  5. ↑ 5.0 5.1 Housman, E. M.; Kaskela, E. D. (September 1970). "State of the art in selective dissemination of information". IEEE Transactions on Engineering Writing and Speech 13 (2): 78-83. doi:10.1109/TEWS.1970.4322444. 
  6. ↑ 6.0 6.1 "Selective dissemination of information". Encyclopaedia Britannica. https://www.britannica.com/topic/selective-dissemination-of-information. Retrieved 26 May 2026. 
  7. ↑ Chatterjee, Amitabha (2017). Elements of information organization and dissemination. Chandos Publishing. ISBN 9780081020258. 



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