Nowadays production systems are often controlled by Kanban. An important precondition is that the variation in the production parameters is relatively small. These variations are taken into account in the calculations of a Kanban including a safety factor. The dynamic behaviour of a Kanban will be illustrated by employing discrete event simulation. If the Kanban is close loop controlled, a reduction of the circulating Kanban cards is possible, provided that the cycle time of variation in the output rate is longer than the fourfold cycle time of a container. If a predictive controller is applied, a reduction is achieved as from more than twice the cycle time of a container. The control of a Kanban can be done manually; however, the installation of an e-Kanban is a better option.