Using Modified Risk Assessment Methods to Communicate Risk
Popov, Georgi, PhD, QEP
Lyon, Bruce, CSP, PE, ARM, CHMM
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A conventional Bow Tie Analysis is a combination of a fault tree and event tree analysis used to provide a clear illustration of the risk pathways and control measures in place for situations that do not require a full fault tree analysis. Bow-Tie analysis typically lacks risk scoring mechanism. The effectiveness of control measures is not reflected in the analysis (high level controls such as substitution and engineering are not clearly distinguished from lower level controls.) To address the potential shortfalls, the authors would like to present a Modified Bow Tie Analysis with Risk Scoring and “Striped” Bow Tie Analysis with Hierarchy of Controls and Layer of Protection Analysis.