Models a top event with AND and OR branches to make critical paths and causes visible.
Core question: Which individual or combined basic events are logically sufficient to produce the defined top event?
Mapping toolMethod form: Mapping tool. Describes how this method is used in practice.HighComplexity: high. Estimates preparation, facilitation effort, and method confidence needed.Workshop + asyncFormat: workshop or async. Shows whether the method works in a workshop, asynchronously, or both.
2-6 h
3-8
Details
OperationsCategory: Operations. Describes the method's domain of use.
A structured accident tree separates management controls, barriers, and events so serious incidents become auditable.
Core question: Which barrier, task, and management factors enabled or failed to prevent the event?
Analysis methodMethod form: Analysis method. Describes how this method is used in practice.HighComplexity: high. Estimates preparation, facilitation effort, and method confidence needed.Workshop + asyncFormat: workshop or async. Shows whether the method works in a workshop, asynchronously, or both.
Mehrere Tage bis Wochen
2-6
Details
OperationsCategory: Operations. Describes the method's domain of use.
Hazards, targets, and failed barriers are mapped so controls can be strengthened at the point of exposure.
Core question: Which barrier should interrupt the path, how did it fail, and which independent control is missing?
Analysis methodMethod form: Analysis method. Describes how this method is used in practice.MediumComplexity: medium. Estimates preparation, facilitation effort, and method confidence needed.Workshop + asyncFormat: workshop or async. Shows whether the method works in a workshop, asynchronously, or both.