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The classical literature on this subject, including the Cranfield reports (whence commeth Recall and Precision) are available at the sig-ir museum<http://www.sigir.org/museum/contents.html> For a more modern text, see chapter 8 of Christopher D. Manning,Prabhakar Raghavanand HinrichSchütze,Introduction to Information Retrieval, CambridgeUniversity Press. 2008.<http://nlp.stanford.edu/IR-book/information-retrieval-book.html> http://nlp.stanford.edu/IR-book/html/htmledition/evaluation-in-information-retrieval-1.html Simon