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We classify production control systems for a multistage production process into two species, namely Push, or Pull, Systems The former is a conventional method in which inventoried parts at each stage are forecast, considering the total flow time to the completion of the process at the final stage. Production and inventory control is based on the forecast value The latter is a proposed system in this paper in which a certain amount of inventory is held at each stage and whose replenishment is ordered by the succeeding process at the rate it has been consumed We formulate the Pull System and give a model simulation of fluctuation in production and inventory through the whole process in terms of system parameters like lot size, lead time, etc.
Kimura et al. (Fri,) studied this question.