A 'bow-tie' is a graphical representation of the pathways from the causes of an event or risk to its consequences. The diagram is shaped like a bow-tie, creating a clear differentiation between reactive risk management and proactive
It is not enough to simply identify risks they must also be managed, analysed, evaluated, monitored, and communicated to be managed: analyzed, evaluated, monitored and communicated. Bow-Tie is a scenario-based risk management tool which helps PSM to accomplish these tasks and to answer questions like: “Where we are most exposed to risk?”, “are we equipped with enough (or too many!) Safety measures in place?”, “are our safety measures actually performing the way we have in view?”
This is a risk assessment method. The bow-tie method helps to analyze and communicate how high-risk scenarios develop.
The benefits of the Bow-Tie analysis include, but not limited to:
Bowties are diagrams that provide a qualitative visual diagram to increase understanding of a risk. If you’re looking for a quick scan of all your risks, a HAZID might be more suitable. If you’re looking for a purely quantitative model, QRA might be more suited. Bowtie is extremely useful in most other risk assessment areas. It’s meant to structure a brainstorm session with multiple disciplines and get a result that everyone can understand without going through a thick report. If this sounds like something you’re looking for, keep reading.
The bow-tie diagram helps you to gain an insight in complex processes through oversight. This objective is always leads ahead of others and can therefore overrule the guidelines if necessary. The objective to keep an understandable diagram always over weighs the intention to be analytically correct.
There are eight basic steps in building a bowtie diagram. They are as follows:
Now with the escalation factors in place, our complete diagram is as follows:
Now the diagram can be completed with more information over each barrier:
This study is not done by one person, but a team. Assembling a competent team is one of the hallmark for a successful study.
This team will include:
Within the team, a lead facilitator should be nominated to lead the study. The lead facilitator should be a competent and experienced person in the conduct of the Bow-tie study.
Bow-Tie XP is the most used risk assessment software that is based on the bow-tie method.
Typical List of Bow-tie for the project
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