# Criticality matrix

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In [operations research](/source/Operations_research) and [engineering](/source/Engineering), a **criticality matrix** is a representation (often graphical) of [failure modes](/source/Failure_mode) along with their [probabilities](/source/Probability) and severities.

Severity may be classified in four categories, with Level I as most severe or "catastrophic"; Level II for "critical"; Level III for "marginal"; and Level IV for "minor".[1]

## Example

For example, an aircraft might have the following matrix:

Failure mode Severity Probability Collision High Low Engine failure High Low Ice buildup Medium High

## References

1. [*DTIC ADA278508: Failure Mode, Effects, and Criticality Analysis (FMECA)*](https://archive.org/details/DTIC_ADA278508/page/26/mode/2up?q=%22criticality+matrix%22). Reliable Analysis Center. 1993. pp. 26–29.

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Adapted from the Wikipedia article [Criticality matrix](https://en.wikipedia.org/wiki/Criticality_matrix) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Criticality_matrix?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.