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| Criterion |  Operations Change Analysis |  Engineering Fault Isolation |  Systems Thinking Current Reality Tree |  Systems Thinking Future Reality Tree |
|---|---|---|---|---|
Purposedifferent | 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. | In technical failures, the visible symptom often gets mixed up with the actual cause. Fault Isolation narrows the fault space and progressively reduces which part of the system is truly affected. | A Current Reality Tree condenses many symptoms into a few causal chains. The method makes visible which core problems drive several negative effects at once. | 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 | Medium | Medium | High | High |
Timedifferent | 45-120 min | 30-180 min | 2-6 h | 2-4 h |
Participantsdifferent | 2-6 | 1-6 | 3-8 | 3-8 |
Formatdifferent | Workshop + async | Workshop + async | Workshop | Workshop |
Outputdifferent | Change Matrix, Cause Hypotheses, Validation Questions, Action List | Fault Isolation Map, Test Log, Excluded Hypotheses, Narrowed Fault Area | Current Reality Tree, Core Problems, Intervention Ideas | Future Reality Tree, Negative Branches, Assumption List, Improved Injections |
Tagsno overlap | ChangeRoot causeTroubleshootingComparison | TroubleshootingDiagnosisEngineering | Systems thinkingRoot causeConstraintsCausality | Theory of ConstraintsSystems thinkingChange |