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Glossary · Functional Safety
ASIL
Also known as: Automotive Safety Integrity Level
Automotive Safety Integrity Level — A through D, where D is the highest rigour.
ASIL is determined per safety goal during HARA via Severity, Exposure, and Controllability ratings. It scales the rigour of every later activity — from quantitative hardware-fault metrics, to coverage targets in software (Statement at A, Branch at B/C, MC/DC at D).
Why it matters
ASIL sets the rigour of nearly every downstream safety activity, so getting HARA and the ASIL assignment right early prevents both under-engineering (a compliance gap) and over-engineering (wasted cost). It also drives co-engineering with cybersecurity, since a safety goal and a security control often touch the same function.
Related pages
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