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A potential sequence of events from an initiating event to an undesired end state that will harm one or more assets.

Accident scenarios may vary significantly, both with respect to the number of events and the time interval from the initiating event to the end event or state. The “path” of an accident scenario is diverted by various conditions and when barriers are activated. In cases where no barriers are available, the sequence may be reduced to a single event. The concept of accident scenario is discussed further by Khan and Abbasi (2002) and is a central element in the ARAMIS methodology (ARAMIS 2004).