“The technology of information retrieval systems continues to evolve, and in particular, the technology of search has continued to evolve. A new stage in the evolution of search has arrived with the advent of entity-based searching. This paper provides a brief review of some of the earlier stages of search evolution in the context of the evolutionary pressures of the concurrent improvement of both precision and recall.” (John D. Holt and David J. Miller – ASIS&T Bulletin October/November 2009)