AbstractAn integrated production inventory model is considered in this paper, for a flow shop type multiproduct batch production system, with a multifacility structure. Instantaneous production is allowed in each facility. The model aims to determine simultaneously the optimal manufacturing cycle for the multiple products and the corresponding optimal procurement policies for the raw material. The cycle concept of multiproduct batch processing is extended to multifacility system and is integrated with the concept of production-inventory system for a single product, single facility system.