| Matrix | Severity categories | |||
| I (1) | II (2) | III (3) | ||
| Likelihood Categories | A (3) | 3 | 6 | 9 |
| B (2) | 2 | 4 | 6 | |
| C (1) | 1 | 2 | 3 | |
| Risk score rating | Low (<3) | Moderate (3 - 6) | High (>6) | |