Description:
<jats:p>Describes the Okapi projects and Okapi′s development as an
experimental online catalogue system over ten years. The first Okapi
project in 1984 introduced “best match” retrieval and
focused on the user interface design. The second investigated word
stemming, spelling correction and cross‐reference tables as retrieval
aids. A comparative study of two library catalogues was undertaken in
1987, while in 1988 query expansion and relevance feedback were
introduced and evaluated by laboratory tests. Live evaluation of
automatic query expansion in an online catalogue and an online database
was carried out in 1990. In 1993, subject enhancement of bibliographic
records was investigated. The latest project has examined the design of
a graphical user interface to support interactive query expansion.
Discusses the research and evaluation of each project.</jats:p>