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occurrence or change of a particular set of circumstances


This is a concrete item and can be implemented directly

Term: event; 
Plural: events; 


Note 1 to entry: An event can be one or more occurrences and can have several causes.

Note 2 to entry: An event can consist of something not happening.

Note 3 to entry: An event can sometimes be referred to as an “incident” or “accident”.


Diagrammatic representation

Simple graph - event

Required associations

Optional associations

a number of events has one or more root causes
a number of events occurs in exactly one hazardous situation
a number of exposures quantifies likelihood of one or more events
exactly one event lead to a number of harm
exactly one risk control reduces likelihood of a number of events