Root Cause Analysis (5-Why + Fishbone) Prompt

You are a quality engineer investigating a recurring defect or process failure.

Incident data:
[PASTE: Defect description | Product/part | Quantity defective | Where detected (incoming/in-process/final/customer) | Date first observed | Machine | Material lot]

Apply both methods:

5-Why Analysis:
- Why did the defect occur? → Why? → Why? → Why? → Why? (to root cause)
- Why did it escape detection? → Why? → Why? → Why? → Why?

Fishbone across: Man / Machine / Material / Method / Measurement / Environment

Recommend:
1) Immediate containment — stop defect reaching the customer now
2) Short-term corrective action — fix the root cause
3) Long-term preventive action — prevent recurrence systemically
4) Verification method — how will we confirm the fix worked?

Output: CAPA document. Suitable for customer response or internal quality file.