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| Criterion |  Operations 8D Problem Solving |  Operations Change Analysis |  Systems Thinking Future Reality Tree |  Systems Thinking Current Reality Tree |
|---|---|---|---|---|
Purposedifferent | For an acute quality or delivery problem, the method structures immediate protection and root cause work together. It keeps the situation stable while the actual cause is investigated cleanly. | 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 | 1-6 Wochen | 45-120 min | 2-4 h | 2-6 h |
Participantsdifferent | 4-10 | 2-6 | 3-8 | 3-8 |
Formatdifferent | Workshop + async | Workshop + async | Workshop | Workshop |
Outputdifferent | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | 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 | QualityProblem solvingRoot cause | ChangeRoot causeTroubleshootingComparison | Theory of ConstraintsSystems thinkingChange | Systems thinkingRoot causeConstraintsCausality |