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On Sat, Jun 4, 2011 at 4:56 AM, Max L. Wilson <[log in to unmask]> wrote: > > Modern Information retrieval is certainly an authoritative text on IR. You might be good searching for ACM SIGIR references on TFxIDF or BM25 by Stephen Robertson and Karen sparck-jones. From the 70s. These were retrieval algorithms that significantly improved precision and recall of keyword search systems. Just wanted to add that the SIGIR museum<http://www.sigir.org/museum/contents.html>includes [Spark Jones, Karen, ed. (1981). Information Retrieval Experiment. Butterworths. ] There are several chapters by KSJ , including a review of tests from 1958-1978, as well as separate chapter on the Cranfield tests. There are different issues involved in evaluating interactive information retrieval systems. See [Kelly, Diane (2009). "Methods for Evaluating Interactive Information Retrieval Systems with Users<http://ils.unc.edu/%7Edianek/FnTIR-Press-Kelly.pdf>". Foundations and Trends in Information Retrieval Vol 3, Nos. 1-2, pp. 1-224]. Of course, the only true measure of an IR system is whether it gets ever searcher their documents, and saves their time.. Simon