Abstract
Selective Dissemination of Information (SDI) is a new and rapidly developing field. The concept was originally set forth by Hans Peter Luhn in 1958. As described by Luhn, one part of a larger idea, the business intelligence system, was Selective Dissemination of Information. SDI involves the use of the computer to select from a flow of new documents, those of interest to each of a number of users. This process may be thought of as the inverse of information retrieval. In information retrieval, a user precipitates a search of a file of documents. In SDI a document precipitates the search of a standing file of user interests. SDI has been called awareness since the attempt is to keep the user aware of current developments. This function has been traditional with those few really excellent librarians and executive staff assistants. SDI is a mechanization of this function.
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