Definition
Failure Mode, Effects and Criticality Analysis (FMECA) extends FMEA's systematic listing of failure modes, causes, and effects with a formal criticality assessment (typically combining severity and probability of occurrence into a ranked score) so limited resources can be prioritized toward the failure modes that matter most, beyond FMEA's general risk prioritization.
Key facts
- Builds directly on FMEA's structure (functions, failure modes, causes, effects) rather than replacing it.
- Adds a formal, typically quantified criticality ranking combining severity and occurrence probability.
- Used when a more rigorous, often regulatory-driven prioritization is required than FMEA's standard risk assessment alone.
- The name similarity to FMEA should not be read as identical scope: FMECA's defining addition is the criticality analysis step.
What does Failure Mode, Effects and Criticality Analysis reveal about failures?
FMECA adds a formal criticality analysis step on top of FMEA's failure mode and effects listing, typically calculating a criticality number from severity and probability of occurrence for each failure mode, producing a ranked list that more rigorously prioritizes where preventive or corrective action is justified.
How do teams use Failure Mode, Effects and Criticality Analysis in failure analysis?
FMEA systematically identifies functions, failure modes, causes, and effects, and assesses risk to prioritize action. FMECA is not a separate method but an extension: it keeps FMEA's structure and adds a dedicated, more formal criticality ranking, often required in safety-critical or regulated industries where a documented, quantified prioritization is necessary.
FAQ
Frequently asked questions
What additional criticality assessment does an FMECA contain?
FMECA extends FMEA with a formal criticality ranking (typically combining severity and probability of occurrence into a score) so failure modes can be prioritized more rigorously than FMEA's standard risk assessment alone.
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