Again, another “wow” moment. For one, NUMMI put the situation in customer terms. Do not use these parts, because there would be a negative impact on the customer. It didn’t say “do not use the parts because I say so (and you wouldn’t understand the reason anyway)”.
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Why are we doing lean? Why is it necessary to standardize our workbenches? Why is it important to get these parts off MRP and onto a kanban system? I bet we would all do better by taking the time to explain why.