In productive enterprises, timely preparation and procurement of goods is very important due to that related costs to\nthe production and working capitals of organization is severely affected. In available scientific methods, including MRP,\nregardless of resource constraints and other factors, the amount of lead time of goods have always considered to be\nfixed. In this paper, then a model will present that lead time of goods is considered as dynamic by using statistical and\nalso effectiveness models from internal and external environment variables of organization and optimized the cost of\nproduction in order to reduce the latency in timely receiving and balancing the warehousing time. At the end, researcher\nwith the implementation of issue in a simulated environment and compare it with the real environment, shows the\nadvantage of proposed model compared to other models by numbers and figures.
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