root-cause-analysis
Root Cause Analysis Skill
If you fixed it but it came back, you fixed a symptom.
Core Principle
Every symptom has a cause. Every cause has a deeper cause. Keep digging until you reach something you can prevent, not just fix.
5 Whys — Extended Example
| # | Question | Answer |
|---|---|---|
| 1 | Why did the page crash? | JavaScript threw a TypeError on null |
| 2 | Why was the value null? | The API returned an empty response |
| 3 | Why did the API return empty? | The database query timed out |
| 4 | Why did the query time out? | Missing index on a 10M-row table |
| 5 | Why was the index missing? | No performance review in the PR process |
Root cause: Process gap (no performance review), not the missing index.
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