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MRP II is a comprehensive, integrated system for managing the resources of a corporation. It includes processes from business planning to scheduling with suppliers. Actually, MRP II is the successor to material requirements planning (MRP), which is more narrowly focused and considers mainly production scheduling, bills of material, and requirements.
Increasingly, MRP II is used with just-in-time techniques because MRP II focuses more on satisfying the quantitative requirements of work orders than on quality. Together, quantity and quality are satisfied.