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Sequencing and scheduling oriented customer driven production planning in CONWIP systems

Encountering the backlog is a common phenomenon in maketo-order production systems. The fluctuations in quantity of orders and delivery lead times of customer orders lead to backlog in delivery of orders. What we are going to develop in this paper is identifying the sequencing and scheduling effects on CONWIP parameters. The sequencing and scheduling objective functions exert some specification in system attributes. In this article we will use some sequencing and scheduling objective function to observe the system parameters alterations for example it is important to minimize the number of tardy jobs and total weighted tardiness causes the mentioned backlogs one by one or simultaneously. Because the different importance of orders, we choose a weighting method to calculate the required weights of orders (jobs) in objective functions optimization procedure. Finally we presented a case study using this method in order to increasing the backlogs.