The Bow Tie Risk Assessment Methodology
What is the Bow Tie Concept?
Bow Tie methodology is a fresh and coherent approach within the Risk Analysis arena. As accidents do not just happen and instead follow a multifaceted causation path in relation to the complexity of “triggered” risks, we desperately needed a Scenario Based and also a qualitative Analysis tool for mitigating risks and that is what exactly Bow Tie is.
How does a Bow Tie Diagram looks like?
Bow Tie idea brought in an effective graphical representation of all potential interactions between (e.g. people, equipment, time, weather and mostly of organisational factors, etc) which might lead into an accident, in a measurable and understandable way, aiming at safety promotion within High Reliability Organisations. Bow Ties do that efficiently because they are constructed in a way to submitting a better overview for each hazard and the specific threats that release the danger altogether with the involved barriers in place to prevent or mediate the potential negative outcomes. An ultimate tool for risk communication and training from top to bottom within the organisation.
Risk in Bow Tie methodology is elaborated by the relationship between Hazards, Top Events, Threats and Consequences. Barriers or Controls are used to display the exact mechanism, an organisation has employed for risk mitigation. The parts in the diagram are laid out in a sequential order and also time factor is accounted as well. Their definition follows:
Overall, Bow Tie methodology and Bow Tie diagrams, in colour depict all information that is needed to present the current safety status of each operation, as it had been decided to function, assists the determination of the effectiveness of each Control, therefore they give us the opportunity to estimate the exact risk exposure.
After having that, each organisation establishes its opinion on how happy it is with measures already taken and has already obtained the means to train all its personnel and a template to modify as organisational learning improves and learning curves become more efficient.