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Words of estimative probability (Wikipedia article; CIA website)
Guidance Notes for Lead Authors ofthe IPCC Fourth Assessment Report on Addressing Uncertainties
Terminology
Virtually certain
Very likely
Likely
About as likely as not
Unlikely
Very unlikely
Exceptionally unlikely
Likelihood of the occurrence/ outcome
> 99% probability of occurrence
> 90% probability
> 66% probability
33 to 66% probability
< 33% probability
< 10% probability
< 1% probability
An ad hoc scale used in the HEG fault tree risk assessment at Imperial College London in May 2014
Likely [0.5, 1]
Common [0.05, 0.5]
Uncommon [0.01, 0.05]
Rare [10-6, 10-2]
Very rare [10-9, 10-6]
Ludicrously unlikely [10-12, 10-9]
Impossible [0, 10 -12]
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