You will reach the root cause within 5 whys.
1. Why X has happened?
Because of some Y....
2. Why did Y occur?
Because of factor Y1
3. Why did Y1 occur?
Because of Y2
4. Why did Y2 occur?
Because of Y3
5. Why did Y3 occur
ANSWER
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Requirements Analysis -- Business requirements document or business requirements specification System Design -- Systems requireme...
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