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Overall, most sources and most practitioners define push and pull incorrectly, probably because the names “push” and “pull” are actually quite misleading. This confusion is quite unfortunate, since pull is one of the key elements of a successful manufacturing system. The main difference is the WIP limit. If you have an explicit WIP limit in your production, you have a pull system and hence have access to all the benefits of a lean pull production. If there is no explicit limit on WIP, it is a push system. See also my posts Different Ways to Establish a Pull System – Part 1 and Part 2 .
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