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.
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OperationsCategory: Operations. Describes the method's domain of use.
A recurring incident pattern links related cases across time so systemic causes become visible beyond one event.
Core question: Which recurring condition connects related events, and which systemic action is missing?
Mapping toolMethod form: Mapping tool. 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.