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Evaluation of information retrieval systems with test collections makes use of a suite of fixed resources: a document corpus; a set of topics; and associated judgments of the relevance of each document to each topic. With large modern collections, exhaustive judging is not feasible. Therefore an approach called pooling is typically used where, for example, the documents to be judged can be determined by taking the union of all documents returned in the top positions of the answer lists returneddoi:10.1145/2806416.2806606 dblp:conf/cikm/MoffatSTB15 fatcat:frqlmmylvvazndyw7ejalo75ve