Designed for use with a computer-produced subject index, PRECIS assigns clerical procedures in subject heading work to computer programs. The subject headings represent a unique combination of several different characteristics, permitting several coextensive forms of a subject name for each work. Final choice amongst alternatives is made by the…

The recently accepted practice by LC of systematic duplication of entries at specific and generic levels is discussed. The new practice is justified but its goals are not accomplished--it does not reveal more of the LC collection, causes inconveniences, and a pointless enlargement of catalogs. It should be abandoned. (Author)