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On a production line, one station often has parts waiting while the next station looks quiet. Does that automatically mean the busy station is the production bottleneck, or could the queue be a short-lived effect of changeovers, uneven batches, or a brief machine stop?
What should a team track over several shifts to distinguish a persistent constraint from ordinary variation? I’m interested in practical signs beyond simply looking at which machine has the largest pile of work-in-progress.
