| Likelihood | 
     Numeric Equivalent  | 
    Definition | 
| Rare | 1 | Event will occur only in exceptional circumstances | 
| Unlikely | 2 | Event could occur at some time | 
| Moderate | 3 | Event should occur at some point in time | 
| High Likelihood | 4 | Event will probably occur in most circumstances | 
| Almost Certain | 5 | Event is expected to occur in most circumstances | 
See also: