How We Handle Urgent Issues and Impediments

A traffic system metaphor is very useful when dealing with Kanban boards. Think of the board as a series of roads, with each card representing a car trying to move across the board from left to right.

images/Project-board/Cars-on-the-board-compressed.png

We want to optimize the flow; therefore, we don’t want to fill up the board. We all know what happens to a traffic system when it is 100 percent full—the traffic system slows to a halt.

images/Project-board/Heavy-traffic.jpg

We need space, or slack, to absorb variation and enable fast flow.

Having slack in the system not only enables fast ...

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