Glossary · Functional Safety

FMEDA

Also known as: Failure Mode, Effects, and Diagnostic Analysis

Failure Mode, Effects, and Diagnostic Analysis — quantitative ISO 26262 hardware metric analysis.

FMEDA combines FMEA with diagnostic-coverage estimates and per-failure-mode rates to compute Single-Point Fault Metric (SPFM), Latent Fault Metric (LFM), and PMHF — the quantitative pieces ISO 26262 Part 5 requires for ASIL B and above. Done well, it is the audit-readable proof that hardware safety mechanisms are sufficient.

Related terms

FMEA
Failure Mode and Effects Analysis — qualitative analysis of how components fail and what they cause.
FTA
Fault Tree Analysis — top-down deductive analysis of how failures combine to a hazardous event.
ASIL
Automotive Safety Integrity Level — A through D, where D is the highest rigour.

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FMEDA

FMEA

FTA

ASIL