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In page Enterprise resource planning:

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Business and technology research and advisory firm Gartner is credited for first using the acronym ERP in the 1990s.[1][2] The term captured a functional extension of two manufacturing-based concepts, material requirements planning (MRP) and manufacturing resource planning (MRP II), as well as computer-integrated manufacturing.[citation needed] Without replacing these terms, ERP came to represent a larger whole that reflected the evolution of application integration beyond manufacturing.[3]