# Likelihood Scale The likelihood scale assesses the probability of a risk event occurring during the project lifecycle. Each level is assigned a numerical value used in calculating the [[Risk Factor]]. | Level | Value | Description | |---|---|---| | [[Rare]] | 0.1 | May occur only in exceptional circumstances | | [[Unlikely]] | 0.3 | Could occur but not expected | | [[Possible]] | 0.5 | Might occur at some time | | [[Likely]] | 0.7 | Will probably occur in most circumstances | | [[Almost Certain]] | 0.9 | Expected to occur in most circumstances |