Individual skill
5why-root-cause
Drill into root cause with a 5-Why why chain, why analysis, or structured root cause investigation. Builds a Why chain from symptom to systemic root cause, validates each step with evidence, and detects circular reasoning. Use for 8D D4, CAPA, FMEA cause analysis, or any quality investigation requiring confirmed root cause identification.
plugins/RBraga01/Quality-Engineering-Skills/skills/problem-solving/5why-root-cause/SKILL.md
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SKILL.mdcore · 8,144 bytesreferences/chain-validation.mddoc · 8,980 bytes
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# 5-Why Root Cause Analysis
## Goal
Identify and validate a systemic root cause through a structured, evidence-based Why chain that can be directly linked to a corrective action.
## Required Execution Checklist
- [ ] Problem defined with measurable data (value vs. specification)
- [ ] Linear Why chain built — one cause path at a time, no branching
- [ ] Each Why supported by objective evidence (not opinion or "probably")
- [ ] Logical consistency verified — reversal check passed
- [ ] Systemic root cause identified (not "human error" or symptom)
- [ ] Root cause validated: reproducibility test + elimination test