| Aspect | 2006 Edition | 2018 Edition | |--------|--------------|----------------| | | RPN (Risk Priority Number) as default | RPN discouraged as primary decision tool | | Action threshold | Arbitrary RPN cutoffs (e.g., >100) | Multi-criteria: severity + occurrence + detection logic | | Criticality analysis | Optional appendix | Fully integrated (FMECA) | | Detection rating | Often ambiguous | Clarified as “likelihood of detection before next step or end use” | | Software FMEA | Not addressed | Dedicated annex |
The standard argues: Brake line rupture (RPN=20) is than a worn pad indicator (RPN=25) because severity is catastrophic. Proper prioritization uses S × O matrix first, then detection to decide verification methods. Final Takeaway IEC 60812:2018 is not a simple checklist—it’s a risk-thinking framework. Its most valuable contribution is moving teams away from RPN-driven mechanical FMEAs toward function-based, severity-first, action-driven analysis. The biggest failure mode of using IEC 60812 is treating it as a fill-in-the-blanks worksheet instead of a decision discipline. iec 60812 pdf
If you are implementing FMEA, the standard insists: | Aspect | 2006 Edition | 2018 Edition