The 5x5 matrix is used to score safety risks. Safety risk scoring is based on the likelihood and impact of the safety risk occurring.
| IMPACT | ||||||
| LIKELIHOOD | Very Low | Low | Medium | High | Very High | |
| Almost certain | 5 | 10 | 15 | 20 | 25 | |
| Likely | 4 | 8 | 12 | 16 | 20 | |
| Possible | 3 | 6 | 9 | 12 | 15 | |
| Unlikely | 2 | 4 | 6 | 8 | 10 | |
| Rare | 1 | 2 | 3 | 4 | 5 | |
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