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Planning, scheduling and dispatching play critical roles in the operations ofa supply chain. Their definitions are clearly given through a unified view inthis paper. The distinction between planning and scheduling is analyzed fromthe view point of microeconomics and queueing theory. The distinction betweenscheduling and dispatching is analyzed from the view point of computationalcomplexity and hierarchical decomposition. Based on the elasticity of price andcapacity, planning can be separated into demand planning or capacity planning.Scheduling period is the time horizon where price and average production costare insensitive to the production rate. The critical roles of the masterproduction schedule and move targets in job scheduling have been explainedthrough the concept of hierarchical decomposition. Dispatching is the lastlayer of job scheduling in the hierarchical decomposition. The advantage ofpull and push systems has been compared and analyzed systematically.

A Unified View on Planning, Scheduling and Dispatching in Production Systems