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Kanban - Wikipedia, the free encyclopedia

Kanban is a signaling system. As its name suggests, Kanban historically uses cards to signal the need for an item. However, other devices such as plastic markers (Kanban squares) or balls (often golf balls) or an empty part-transport trolley can also be used to trigger the movement, production, or supply of a unit in a factory.

A cool concept, I can and have seen it used in game design. It might be fun to make a game that works explicitly with the concept. Come to think of it, it’s sort of a backwards implementation in the Freaky Factory game.