Bow-tie diagrams provide a better understanding of risk scenarios and show how they are controlled. In classic bow-tie modelling, the decision whether there are sufficient effective barriers to control these scenarios is based on expert judgement.
When the organisation has reliable and sufficient safety data available, the LOPA plug-in allows this data to be used to make more objective and proven decisions by quantifying risk analysis.
The Layers of Protection Analysis (LOPA) is a semi-quantitative risk analysis methodology. With it, the frequency of a negative event is calculated based on the risk reduction provided by independent protection layers (barriers).