MONO91 Indexes Compiled by Machine chapter Mary Elizabeth Stevens National Bureau of Standards 11The most feasible scheme for alerting individuals to what is of interest in their own field requires an on-going up-to-date citation index. For each narrow field of interest of an individual there are, it is believed with good reason, three to five to ten key items such that: (cl) If he knew that a new item referred to one of his key items, the individual would be glad to skim the new item, (c2) An individual who skimmed all new items referring to one of his key items would be adequately alerted to the newest results in his own specialties." 1, "A research worker who finds one article several years old can relate later developments by locating all subsequent articles that have referred to it. Corrections and errata can be brought together by a citation index." 2/ [OCRerr]`Citation indexing will overcome artificial dividing lines that are drawn in various abstracting services." 3/ "It is believed that citation indexes will be useful.. . in bringing together related materials in different fields where the interrelationships are not readily identifiable from other types of indexes." 4/ "Since the end product of a citation indexing is a ]3isting which collects in one place the bibliographical descendants of a given cited author, bringing these titles together helps to illuminate for the searcher the extent and nature of information association patterns employed by other authors who had a similar or related interest to his own. Its development, therefore, serves as an approach to the user's frame of reference, not the indexer's." 5/ The importance of being able to pick up more than the principal subject matter clues is indeed an advantage of citation indexing. Garfield, commenting on the potential cross-breeding of interests, gives an example of a personal search for more information on the RCA electronic scanning pencil in which he was led to one of Busa's reports on machine use in philological analysis and to an article of interest in the field of informa- tion theory. 6/ Garfield further points out that the cross-breeding can extend across 1/ 2/ 3/ 4/ 5/ 6/ Tukey, 1962 [611], p.9. Atherton, 1962 [25], p.2. See also Garfield, 1955 [213], p.1. Atherton and Yovich, 1962 [26], p.3. Brownson, 1963 [82], p.3. See also Garfield, 1957 [211], p.4. BeckerandHayes, 1963[45], p.137. Garfield, 1954[210], pp.4-5. 31