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Preserved Context Index System (PRECIS)
PRECIS (Preserved Context Index System) was designed and developed by Derek Austin by about 1970 as an alternative procedure for deriving the subject headings and subject index entries for British National Bibliography (BNB). Since 1952, for nearly 20 years, BNB followed chain procedure for deriving subject index entries. Two most important factors worked for the development of PRECIS: I) Idea of replacing chain indexing technique of BNB; and ii) the decision of the British Library to generate computer produced BNB with all the indexes in view of launching the UKMARC project. Accordingly, a research project for a suitable alternative for generating subject indexes directly from the machine readable records were undertaken by the British Library with the following objectives, which, ultimately resulted in the development of PRECIS:
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