Likelihood

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Definitions

EU Definitions

CLIMATE-ADAPT

The likelihood of an occurrence, an outcome or a result, where this can be estimated probabilistically. [1]



European Project Definitions

CIPRNet project

The CIPRNet project [2] uses the following definition:

Likelihood is the chance of something happening.


RESIN project

The RESIN project [3] gives the following definition:

The chance of a specific outcome occurring, where this might be estimated probabilistically. [4]


Other International Definitions

IPCC

Likelihood: A probabilistic estimate of the occurrence of a single event or of an outcome, for example, a climate parameter, observed trend, or projected change lying in a given range. Likelihood may be based on statistical or modeling analyses, elicitation of expert views, or other quantitative analyses. [5]



National Definitions

Canada

Likelihood: The chance of an event or incident happening, whether defined, measured or determined objectively or subjectively.

Vraisemblance: Possibilité qu’un événement ou un incident se produise, que celle-ci soit définie, mesurée ou déterminée de manière objective ou subjective. [6]



Kingdom of Saudi Arabia

Likelihood: A weighted factor based on an analysis of the probability that a given threat is capable of exploiting a given vulnerability. (NISTIR 7298r2 Glossary of Key Information Security Terms) [7]



Norway

(I risikoanalyser) brukes ofte sannsynlighet som mål på hvor trolig vi mener det er at en bestemt hendelse vil inntreffe, gitt vårt kunnskapsgrunnlag. [8]

(In risk analyses) likelihood is often used as an expression of how likely we think it is that a specific event will occur, given our knowledge base. [9]



United Kingdom (UK)

Likelihood is the chance of an event or outcome occurring, usually expressed as a probability. [10]



United States

DHS
Estimate of the potential of an incident or event’s occurrence. [11]


NIST
Likelihood: A weighted factor based on a subjective analysis of the probability that a given threat is capable of exploiting a given vulnerability. (from: NIST SP 800-161) [12]


Standard Definition

ISA

Likelihood is the quantitative estimation that an action, event or incident may occur. [13]


ISO 73:2009

Chance of something happening. [14]

Discussion Topic

See also

Notes