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Integration of ill-known requirements in production planning

This paper addresses the integration of ill-know requirements (imprecision or uncertainty on quantities or due dates) in a gross requirements (expressed in terms of quantities by periods). Ill-known requirements may come from a customer of the supply chain (forecast orders) or from a make-to-order production release. The types of imperfections on these requirements are analysed and a representation model based on mathematical models of uncertainty is proposed. Moreover, a method is proposed to compute the gross requirements without loss of information. This method is illustrated on an example.