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Information retrieval (IR) research on text collections has concentrated on improving the effectiveness of the indexing and retrieval operations. For the most part, the evaluation of IR systems has been carried out on relatively small collections of documents, queries and relevance assessments. In 1992 the first of a series of evaluation exercises called TREC (Text REtrieval Conference) was launched in the US and these exercises have continued annually since then. What makes TREC notable in IRdoi:10.1177/016555159702300302 fatcat:k237c67jznhfjfrnn63bfzgloq