Criticality matrix
In operations research and engineering, a criticality matrix is a representation of failure modes along with their probabilities 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".
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 |