A major issue in the design of an aggregate multi-period model for medium-term planning of production is the determination of the aggregation level of the variables. In the process of model design, one has to examine if and how the outcomes of the model are effected by applying different modes and levels of aggregation. This is especially important with regard to those outcomes which will be used for medium-term decisions and for laying out short-term and detailed plans. Also dependent on the aggregation level is the operational convenience of the model for decision support. In this paper it will be shown that simulation experiments with a preliminary model for medium-term planning can yield valuable information to aid this design problem. © 1982.
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