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| Criterion |  Operations Fault Tree Analysis |  Operations Change Analysis |  Systems Thinking Future Reality Tree |
|---|---|---|---|
Purposedifferent | For a critical top event with several possible triggers, the method logically models failure paths. It makes visible which combinations of conditions can lead to damage. | For a deviation after a change, the method isolates the influence of the altered condition. It narrows down which differences are relevant and which are just accompanying noise. | A Future Reality Tree shows how desired actions are meant to lead to a better system state. The method checks whether a path of change holds together logically before time flows into implementation. |
Complexitydifferent | High | Medium | High |
Timedifferent | 2-6 h | 45-120 min | 2-4 h |
Participantsdifferent | 3-8 | 2-6 | 3-8 |
Formatdifferent | Workshop + async | Workshop + async | Workshop |
Outputdifferent | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | Change Matrix, Cause Hypotheses, Validation Questions, Action List | Future Reality Tree, Negative Branches, Assumption List, Improved Injections |
Tagsno overlap | RiskRoot causeSafety | ChangeRoot causeTroubleshootingComparison | Theory of ConstraintsSystems thinkingChange |
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