A kanban system requires that the process has little variability in lead time because shortages impact the entire production system.

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A kanban system is a just-in-time (JIT) production system that relies on a pull-based approach to manufacturing. This means that the output of one process is only produced when the downstream process requires it, so the inventory levels are kept low. In such a system, any variability in lead time can cause shortages, which can in turn impact the entire production system, leading to delays, overproduction, and increased costs. Therefore, it is important to eliminate variability in lead time as much as possible to ensure smooth and efficient production flow in a kanban system.

A Kanban System Requires That the Process Has Little Variability