| Probability | 1 | 2 | 3 | 4 | 5 |
| Descriptor | Rare | Unlikely | Moderate | Likely | Almost certain |
| Frequency: How often might it / does it happen? | This will probably never happen or recur. Not expected to occur for years | Not expected to happen or recur, but it is possible. Expected to occur at least annually | Might happen or recur occasionally. expanded to occur every quater. | Will probably happen or recur, but it is not a persistent issue or circumstances. Expected to occur at least monthly. | Will undoubtedly happen or recur, possibly frequently. Expected to occur at least weekly. |
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