Explain the evaluation criteria of an indexing system.

The epigraph indicates the value which has been historically attached to subtlety of distinctions in the language or lexicon of information retrieval systems. In this respect, the passage anticipates the principle formulated in modern discussions of indexing and classification that the value of an index term lies in its discriminatory power. In this principle, and in its historical anticipation, there is a strong, although largely unnoticed, contrast with the assumption of information retrieval research, particularly experimental information retrieval research, that the performance of an information retrieval system is to be measured by its capacity to deliver relevant records in response to deliberately articulated queries.

The concern here is not, then, with the uses of classification in information retrieval but with the broader question of whether the central principle embodied in the practice and theory of classification and indexing can yield more satisfying design and evaluative criteria for information retrieval systems than those which have been characteristically assumed in information retrieval research. Two paradigms have been distinguished in information retrieval research, the cognitive and the physical, but they share the assumption of the value of delivering relevant records (Ellis 1996: 19; Belkin and Vickery 1985: 114). For the purposes of the discussion here, they can be considered as a single, if heterogeneous, paradigm, linked if not united, by this common assumption.

The contrasting paradigm implicitly embodied in classification and indexing may finally be incommensurable with that of information retrieval research, with disputes not logically resolvable within either paradigm. The approach taken in this paper will be suggest:

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