The amount of requests (the demand) and the amount of time people have to handle the requests (their capacity) is almost always unbalanced. This is why we need a pull system—in which people can focus on one thing long enough to finish it before starting something new—like kanban. Kanban is a visual pull system based on constraints that allow workers to pull work when they have availability instead of work being pushed onto them regardless of their current workload. Since demand and capacity are frequently unbalanced, and it’s almost impossible to get everything done on time, systems like
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