 If one of the container is empty, the remaining container is swapped with the empty one (FIFO) and production of the assembly is resumed according to the kanban-quantity computed by the MES.Another purpose of the supermarket is that it enables a quick replenishment of the workplaces with the needed raw-materials without the necessity for taking these materials from the store for each production order as opposed to the above described push-strategy where every material has to be issued to every production order at the withdrawal from stores.In other words, the quantity of any assembly or raw-material being stored in the supermarket is strictly limited, there is an explicit WIP constraint.