Evaluation of Systems by Comparison Testing
F. Wilfrid Lancaster · College & Research Libraries · 1966
Evaluation of Systems by Comparison TestingThis paper contends that the retrieval abilities of four index languages studied in the Cranfield Project are comparable, although many of their respective characteristics differ considerable one from another.The ability of a system to retrieve a high percentage of documents may not, in itself, be meaningful; the total expenditure of effort must also be taken into account.In the case of the Cranfield Project, the four systems, utilizing a common conceptual analysis and given identical entry vocabularies, would have achieved identical recall performance for any given group of requests.