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| Criterion |  Operations Failure Mode and Effects Analysis |  Operations Change Analysis |  Systems Thinking Future Reality Tree |  Systems Thinking Current Reality Tree |
|---|---|---|---|---|
Purposedifferent | For a process, product, or service with noticeable failure risks, the method assesses possible failure modes in advance. It directs attention to combinations of occurrence, effect, and detectability. | 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. | 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. |
Complexitydifferent | High | Medium | High | High |
Timedifferent | 2-6 h | 45-120 min | 2-4 h | 2-6 h |
Participantsdifferent | 3-10 | 2-6 | 3-8 | 3-8 |
Formatdifferent | Workshop | Workshop + async | Workshop | Workshop |
Outputdifferent | FMEA Table, Risk Priority, Mitigation Actions | Change Matrix, Cause Hypotheses, Validation Questions, Action List | Future Reality Tree, Negative Branches, Assumption List, Improved Injections | Current Reality Tree, Core Problems, Intervention Ideas |
Tagsno overlap | RiskQualityOperationsRoot cause | ChangeRoot causeTroubleshootingComparison | Theory of ConstraintsSystems thinkingChange | Systems thinkingRoot causeConstraintsCausality |