![]() Of output lines, depending on whether the pivotal event occurs Pivotal events have a single input line and a (Yes/No) pairĢ00 ⢠Risk of Vessel Accidents and Spills in the Aleutian IslandsįIGURE F-1 Event sequence diagram method. That ultimately end with a diamond symbol representing their end The possible events or con-ĭitions (rectangles in the diagram) that can follow the initiating eventĪre then listed in the proper temporal or logical order, connectedīy lines, forming various possible strings or sequences of events The diagram starts with a circle sym-īolizing the initiating event or condition. To describe the various elements of a scenario. In event sequence diagramming, a set of graphical symbols is used Scenarios provide the context within which the events and theirĬauses are evaluated as potential hazards or sources of risk. The sequence of events from A (the initiatingĮvent) to the end states (C or F) forms two simple scenarios. Another event (e.g., crew recoveryĪction) is initiated at that point, and depending on whether it suc-Ĭeeds or fails, the vessel returns to the safe zone (Point C), or an acci-ĭent occurs (Point F). At Point A, an event (e.g., equipment failure) occurs, causingĭeviation from the normal operating zone and putting the vessel Initially operating within the âsafe functional/physical zoneâ (shadedĪrea). The ï¬gure depicts the change of state of a vessel Figure F-1 illustrates the event sequenceĭiagram method. Tion of the logical and temporal sequence of causal factors leading to The event sequence diagram method is a simple and powerful mod-Įling tool for developing possible risk scenarios. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages. Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book.
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