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| Criterion |  Operations Fishbone Diagram |  Systems Thinking Future Reality Tree |  Operations Failure Mode and Effects Analysis |  Systems Thinking Current Reality Tree |
|---|---|---|---|---|
Purposedifferent | When a problem has several possible contributing factors, the method sorts causes by cause areas. It prevents an initial hunch from blocking the view of other plausible drivers. | 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. | 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. | 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 | Low | High | High | High |
Timedifferent | 30-60 min | 2-4 h | 2-6 h | 2-6 h |
Participantsdifferent | 2-8 | 3-8 | 3-10 | 3-8 |
Formatsame | Workshop | Workshop | Workshop | Workshop |
Outputdifferent | Fishbone Diagram, Cause Categories, Investigation Backlog | Future Reality Tree, Negative Branches, Assumption List, Improved Injections | FMEA Table, Risk Priority, Mitigation Actions | Current Reality Tree, Core Problems, Intervention Ideas |
Tagsno overlap | Root causeQualityOperations | Theory of ConstraintsSystems thinkingChange | RiskQualityOperationsRoot cause | Systems thinkingRoot causeConstraintsCausality |