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The bowtie depicts scenarios in a time ordered sequence moving from left to right.
They describe events that may cause an unsafe state if not managed with preventative controls.
Consider the top event and ask the question ‘why’ or ‘how’ could this occur. These causes are the threats and need to be ‘direct’. There should be a logical cause and effect relationship between the threat and the top event. The reader should be able to understand this relationship based on the threat description.
In our example of driving a car on a busy UK motorway, a threat would be tyre blow out.
A possible direct cause that will potentially release a hazard by producing a top event.
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