Figure 1 As a result, the manufacturer should get exact knowledge of demands of finished products and sustain an optimum production schedule to match the supply chain manufacturing system. If production is synchro- nized with the customers’ lumpy demands and the ordering of raw material with production schedules is Figure 1: A serial multi-stage drug manufacturing system with Kanban operations properly coordinated, all raw materials, WIP and finished goods inventories could be sustained at an economic level in a manufacturing firm to reduce the integrated inventory cost incurred due to raw materials, WIP, and finished products.