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| Criterion |  UX Research Surveys |  Systems Thinking Current Reality Tree |  Operations 8D Problem Solving |  Operations 5 Whys |
|---|---|---|---|---|
Purposedifferent | When a topic needs to be validated broadly and many people can answer the same question, surveys gather structured feedback in a scalable form. Answers become comparable and segmentable instead of remaining merely anecdotal. | 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. | 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 single, hard-to-explain deviation, the method exposes the causal chain behind the visible symptom. It keeps the cause open until a controllable condition emerges instead of a mere description. |
Complexitydifferent | Medium | High | High | Low |
Timedifferent | 3-14 Tage | 2-6 h | 1-6 Wochen | 15-30 min |
Participantsdifferent | 50+ | 3-8 | 4-10 | 2-6 |
Formatdifferent | Async | Workshop | Workshop + async | Workshop |
Outputdifferent | Survey Results, Charts, Segment Insights | Current Reality Tree, Core Problems, Intervention Ideas | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | Root cause notes, Countermeasures |
Tagsno overlap | QuantitativeResearchValidation | Systems thinkingRoot causeConstraintsCausality | QualityProblem solvingRoot cause | Root causeIncidentLeanProblem solving |