From single line arrow image 1 () refers to the flow of essential information and functions that each agency must participate. Best double arrow. (A) it refers to the flow of material from the requisition until delivery to the customer. The material in this case refers to the raw materials and production process, including the completed item. This is when considering the framework of a production planning system from image 1 to find that the production planning stage that can digest according to duration is long-term planning of short-term and medium-term, in which each stage, it will be the purpose and topics that are elements of the plan are different. Is as follows:
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