Aggregate production planning is a planning process and control of entire production activities to meet the variable demands of aggregate products. The goal is to determine the production and inventory levels to minimize the total production cost with limited resources of workforce and equipment. On the other hand, the aim of maintenance planning is to improve the efficiency of equipment to satisfy the production requirements. In this paper an integrated model of aggregate production planning and maintenance planning is developed to determine the optimal plan of production and preventive maintenance in each period. To exhibit the performance of the introduced model, a case study is conducted in a pharmaceutical company and its results are expressed.

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