Functional safety
How is an ASIL assigned to a hazardous event?
LAST REVIEWED
| Parameter | Question it answers | Scale |
|---|---|---|
| Severity (S) | How badly could people be harmed? | S0–S3 |
| Exposure (E) | How often does the situation occur? | E0–E4 |
| Controllability (C) | Can the harm still be avoided? | C0–C3 |
The letter itself carries no weight without the reasoning behind it. Assessors look for a recorded rationale for each S, E and C rating, the operating situation it assumes, and the traceability from the resulting safety goal down to the requirements and verification evidence that implement it.
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