The Automotive Safety Integrity Level (ASIL) is a risk classification system in the ISO 26262 standard. It defines four levels of safety requirements for automotive systems:
1. ASIL levels:
- ASIL A: Lowest safety requirement
- ASIL B: Moderate safety requirement
- ASIL C: High safety requirement
- ASIL D: Highest safety requirement
2. Determination factors:
- Severity: Potential harm from a hazard
- Exposure: Probability of the hazardous situation
- Controllability: Ability to avoid harm
3. Application:
- Assign ASIL to each safety goal
- Guide development and validation processes
- Determine necessary safety measures
4. Impact on development:
- Higher ASIL requires more rigorous development
- Influences testing and verification methods
- Affects documentation and traceability requirements
5. Benefits:
- Standardises safety assessment across the industry
- Helps prioritise safety-critical functions
- Guides resource allocation for safety measures
ASIL helps automotive manufacturers ensure appropriate safety measures are implemented for each system function.