PENNSYLVANIA UNIV PHILADELPHIA INST FOR COOPERATIVE RESEARCH
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Document grouping is a scheme whereby a grouping is made of certain serial numbers given documents within a coordinately indexed collection along with the index terms assigned to those documents. By then assigning a group number to these selected serial numbers, they may be stored as a group. Such grouping might permit reductions in storage and in searching time when used in some kinds of coordinate retrieval systems. The set of document group numbers resulting from such a search may be further perused for indexing terms by the use of a card catalog, a book which lists serial numbers and index terms, or directly in a file of documents. In the last case, each document group can be preceded by a guide sheet in scan column format. Document grouping is applicable to punch-card sorting systems, peek-a-boo cards, and the scan column index. False drops resulting from document grouping are discussed in detail. The scan column index is summarily described It is usually in book form, each document being represented by a horizontal line on the page on which are placed the serial number of the document along with abbreviations for the terms from the indexing vocabulary. Prepared for presentation at the Meeting in Miniature of The American Documentation Institute in Philadelphia, Feb. 10-11, 1961.