Kanban is the Japanese word for visual card of providing information to regulate the flow of inventory and materials. Kanban has three rules [20]: (1) visualize the workflow, (2) limit work in progress (WIP) at each workflow state, and (3) measure the lead time (i.e., average time to complete one item). Kanban fulfills the function of visibility, production control and inventory control [21], and a kanban system is meant to introduce stability and predictability into inventories held to be responsive to market changes [22] and [23]. Besides manufacturing, kanban has been applied to software production as a process model for project management [24].