Risk Assessment in ISO Standards: Methodologies, Tools and Best Practices (2025)
Risk-based thinking is now embedded in every major ISO standard via Annex SL. Whether you are implementing ISO 9001, 27001, 45001, 22301 or 42001, you need a robust risk assessment methodology. This guide covers the main frameworks, when to use each, and how ISO Xpert can help.
Why Risk Assessment Matters
- ISO 9001 Clause 6.1 requires risk-based thinking for quality objectives
- ISO 27001 Clause 6.1.2 mandates an information security risk assessment
- ISO 45001 requires hazard identification and risk assessment (HIRA)
- ISO 22301 requires business impact analysis and risk assessment
- ISO 31000 provides the umbrella risk management framework
Key Methodologies Compared
| Method | Best For | Output |
|---|---|---|
| ISO 31000 5x5 Matrix | General enterprise risk | Risk register with L x I scores |
| ISO 27005 | Information security risk | Asset-threat-vulnerability model |
| HAZOP | Process safety (oil and gas, chemical) | Deviation-cause-consequence tables |
| LOPA | Layer of protection analysis | Required SIL for safety functions |
| FMEA / FMECA | Product/process failure modes | RPN scores and mitigations |
| Bow-Tie | Visual barrier analysis | Threat-barrier-consequence diagrams |
5-Step Risk Assessment Process (ISO 31000)
- Establish context - scope, objectives, criteria, stakeholders
- Identify risks - assets, processes, threats and vulnerabilities
- Analyse risks - likelihood x impact scoring
- Evaluate risks - prioritise against risk criteria and appetite
- Treat risks - accept, mitigate, transfer or avoid
Free Tools
Use our free risk scorer and calculator or browse risk management toolkits in the shop.
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Need help with risk assessment?
ISO Xpert provides risk analysis consulting aligned to ISO 31000, 27005, HAZOP, LOPA and SIL.