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Larger context for LACK in Corpus USbrown_UKbncw/UK_bncw.txt

  The duality of the matching and contextual approaches requires further investigation.   A recent study of the use of a printed PRECIS (PREserved Context Indexing System) index for subject searching reveals that searchers who adopted a broad search formulation strategy were more successful than those who took an exact matching approach in accessing the index.   Half the subjects were able to narrow their search during the PRECIS consultation, whereas those with an exact search formulation had to broaden it.   The opportunity for experimentation in comparing, selecting and rejecting terms in the PRECIS consultation was an important feature of the search process.   lack >   However, the manual system lack ed a direct link with a title listing, i.e., the end result of the consultation was a classification number and not specific titles from which further refinement could have been made.     Another study, analysing search negotiations between librarians and users and the subsequent search process, shows that certain parallels can be drawn between the matching and contextual approaches adopted by the users of the PRECIS index.   Ingwersen has characterized three types of searches the open search, the fixed search and the semi-fixed search.