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Reference.org
Boolean model of information retrieval
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<p>The (standard) Boolean model of information retrieval (BIR) is a classical <a href="/facts/Information_retrieval/MFSmpeNw">information retrieval</a> (IR) model and, at the same time, the first and most-adopted one. The BIR is based on <a href="/facts/Boolean_logic/VkCToAmg">Boolean logic</a> and classical <a href="/facts/Set_theory/1ptfsvUP">set theory</a> in that both the documents to be searched and the user's query are conceived as sets of terms (a <a href="/facts/Bag-of-words_model/TlhIx600">bag-of-words model</a>). Retrieval is based on whether or not the documents contain the query terms and whether they satisfy the boolean conditions described by the query. </p>