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Great article by Devin McElroy from Quality Progress magazine about the root causes of defects
Human error is an insufficient root cause because it doesn’t identify the real problem causing the defect.
Employee retraining often is implemented as a corrective action, but because human error isn’t the true root cause, retraining doesn’t prevent the defect from recurring.
Asking “Why did the human err?” will help you identify the true root cause of a problem.