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Five Whys (Toyota): iterate "why?" until you reach a systemic/actionable root cause.
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| name | five-whys |
| type | skill |
| hint | Root cause analysis — ask 'why?' 5 times; stops at systemic cause not symptom |
| version | 1.0.0 |
| tags | ["transferable","five-whys","root-cause","rca","why","symptom","systemic","cause","analysis"] |
| tier | sm0l |
| complexity | 2 |
| description | Five Whys (Toyota): iterate "why?" until you reach a systemic/actionable root cause. |
Five Whys (originating from Toyota) is a root cause analysis technique where you iterate "why?" until you reach a systemic, actionable root cause. Each answer becomes the subject of the next "why?" — for example: Bug in prod → why? → test missed it → why? → no test for this path → why? → developer didn't know the path existed → why? → no onboarding doc → why? → we never wrote it. Root cause: missing documentation process.
Fix the root, not the symptom — patching the bug without fixing the process guarantees recurrence. The number 5 is a heuristic, not a law. Stop when you reach something you can actually change. Watch for multiple branches — one "why" may have two answers, diagram both.
Use Five Whys during incident post-mortems, debugging sessions, process improvement, and any time you need to find the underlying systemic cause of a problem rather than treating surface symptoms.
