How do MRP (" Material Requirements Planning "), MRPII (" Manufacturing Resources Planning "), and ERP differ? To what degree do they address the problems of their respective "predecessors"?

物料需求规划，MRPII制造资源规划，ERP之间的差别在哪里？他们凸显他们各自的理论前身所存在的问题的程度有多少？

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Research on Bill of Material and Material Requirements Planning in MRP System;

研究了提前期不确定情况下总装生产物料需求计划的优化问题。

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