5. D4 – Searching for and identifying root causes
Once the problem has been contained with effective immediate action, you can take a step back to analyze the exact cause of the malfunction.
5.1 The activities
Search for root causes at a first level – technical – and along two axes: the causes of the appearance of the proven problem, and the causes of the non-detection of the proven problem.
Search for root causes at a second level – systemic – and along two axes with, respectively, the causes of the potential problem's appearance, and the causes of the potential problem's non-detection.
Here again, the use of quality tools will help you to achieve this, in the following sequence.
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D4 – Searching for and identifying root causes
D5 – Choice of corrective actions and verification
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