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European Definitions


Event is an occurrence of a particular set of circumstances (refers to ISO/IEC Guide 73). [1]

European Project Definitions

CIPRNet project

The CIPRNet project [2] uses the following definition:

Event: An event describes what happens to a component in the CI model if a condition is fulfilled, e.g. the tripping of a transmission line at a certain time.

National Definitions


Event is an incident or situation, which occurs in a particular place during a particular interval of time. [3]

Occurrence or change of a particular set of circumstances. [4]


Evento / Acontecimento. Em análise de risco, ocorrência externa ou interna ao sistema, envolvendo fenômeno da natureza, ato humano ou desempenho do equipamento, que causa distúrbio ao sistema. [5]

Event: In risk analysis, external or internal occurrence to the system, involving phenomenon of nature, human act or equipment performance, that causes disturbance to the system.


A significant occurrence that may or may not be planned and may impact the safety and security of Canadians.

Fait important, planifié ou non, qui peut avoir des repercussions sur la sécurité des Canadiens. [6]

Czech Republic

Událost: Výskyt nebo změna určité množiny okolností. [7]

Event is the occurrence or change of a certain set of circumstances. [8]


Event ist eine Aktivität, bei der zusätzliche Ressourcen eingeholt werden, wenn diese erforderlich sind, um den Service Level Zielen oder Kundenerwartungen gerecht zu werden. [9]


Evento: Fenomeno di origine naturale o antropica in grado di arrecare danno alla popolazione, alle attività, alle strutture e infrastrutture del territorio. [10]

La legge n. 225 del 1992 all’art. 2 individua tre tipi di eventi di protezione civile:: a) eventi naturali o connessi con l’attività dell’uomo che possono essere fronteggiati con interventi di singoli enti e amministrazioni in via ordinaria; b) eventi naturali o connessi con l’attività dell’uomo che, per loro natura ed estensione, comportano l’intervento coordinato di più enti e amministrazioni in via ordinaria; c) calamità naturali, catastrofi o altri eventi che, per intensità ed estensione, devono essere fronteggiati con mezzi e poteri straordinari.


Voorval omvat mede ongeluk of incident. [11]


Event: Any observable occurrence in a system and/or network. [12]

Events sometimes provide indication that an incident is occurring.


An event is an observable occurrence in a system or network. [13]

United States

Any observable occurrence in a network or system.[14]

Any observable occurrence in an information system. [15]

Standard Definition

ISO/PAS 22399:2007

Occurrence or change of a particular set of circumstances. [16]

ISO/IEC 27000:2014 [17] also notes that:

  • An event can be one or more occurrences, and can have several causes.
  • An event can consist of something not happening.
  • An event can sometimes be referred to as an “incident” or “accident”.

Moreover, ISO 31000:2009 [18] and ISO 22301:2012 [19] note that an event without consequences can also be referred to as a “near miss”, “incident”, “near hit” or “close call”.

See also