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Larger context for LACK in Corpus USbrown_UKbncw/UK_bncw.txt

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.
However, the manual system lacked 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.
In the open search the librarian starts by drawing on knowledge concepts which extend beyond the query formulated by the user and are " open to new information."
By contrast, in the fixed search the librarian searches for a direct solution to the query by trying to find "the document that included the answer immediately."
The semi- fixed search starts as a fixed search but then progresses to a more open mode.