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In IR research it is essential to know IR models. Research over the past years has consolidated the foundations of IR models. Moreover, relationships have been reported that help to use and position IR models. Knowing about the foundations and relationships of IR models can significantly improve building information management systems. The first part of this tutorial presents an in-depth consolidation of the foundations of the main IR models (TF-IDF, BM25, LM). Particular attention will bedoi:10.1145/2499178.2499203 dblp:conf/ictir/Roelleke13 fatcat:5d5vdwyjznegzm4qtler76gcje