A firm must plan its manufacturing activities at a variety of levels and operate these as a system. Manufacturing planning and scheduling has attracted an increasing amount of attention from both the academia and the industry in the past decade. This study aims to develop a better understanding of the production planning problems for low-volume and make-to-order production for engineering industry. The proposed models based on mathematical programming. The time horizon splitting approach is proposed, where the whole planning task is decomposed into hierarchy of sub-problems
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