Use 5 Whys Without Stopping at Operator Error
Use 5 Whys as part of root-cause analysis to identify fixable process conditions.
A wrong carrier was loaded into a metrology tool, and the first root-cause draft stops at operator error. Root Cause Analysis with 5 Whys: keep asking until you reach a preventable process condition The common trap is treating the last human action as the root cause and assigning retraining as the only corrective action. Why 1 Why was the wrong carrier measured? The technician selected a carrier from the staging cart that looked like the correct lot. This is a symptom-level cause. It tells you what happened, not why the process allowed it. Why 2 Why was the wrong carrier…
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