FMEA
Failure modes & effects analysis
- Best for
- cataloguing engineering risk
- Time
- 1–2 hr
- Difficulty
- Advanced
Example
Engineering FMEA on a payment processing module
Failure modes ranked by RPN
- Duplicate charge on retry — Severity 9 × Occurrence 4 × Detection 3 = RPN 108
- Webhook lost in transit — Sev 8 × Occ 5 × Det 4 = RPN 160 (top risk)
- Refund applied to wrong account — Sev 10 × Occ 2 × Det 5 = RPN 100
- Currency rounding mismatch — Sev 5 × Occ 6 × Det 4 = RPN 120
- Action: idempotency keys + retry queue + reconciliation job
Related frameworks
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