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Three-schema approach
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<p>The three-schema approach, or three-schema concept, in <a href="/facts/Software_engineering/KX6cE9kz">software engineering</a> is an approach to building <a href="/facts/Information_systems/apcSzFLh">information systems</a> and systems <a href="/facts/Information_management/kDLoyfz1">information management</a> that originated in the 1970s. It proposes three different <a href="/facts/View_model/BQwCa1Rw">views</a> in systems development, with <a href="/facts/Conceptual_model/hgysE2kP">conceptual modelling</a> being considered the key to achieving <a href="/facts/Data_integration/BU47JR28">data integration</a>. </p>