"The Phoenix Project" references this - when a particular resource (expert) is the only person who can get some task done. Of course that means that person is at or beyond 100% utilization, which means their queue length (or wait time) goes through the roof. Paradoxically, reducing utilization increases productivity/throughput. The section about controlling WIP here [1] illustrates it quite well.[1] https://itrevolution.com/resource-guide-for-the-phoenix-proj...
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