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| Criterion |  Operations 8D Problem Solving |  Operations Causal Factor Analysis |  Product Discovery Fake Door Test |  Operations 5 Whys |
|---|---|---|---|---|
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 an event with a complicated course, the method breaks down the contributing factors along the timeline. It shows how conditions, decisions, and reactions together produce a course of events. | When demand is still unclear, it measures interest in a feature before it is built. It separates real behavior from polite agreement and deliberately keeps build effort small. | 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 | High | High | Medium | Low |
Timedifferent | 1-6 Wochen | 2-6 h | 1-5 Tage | 15-30 min |
Participantsdifferent | 4-10 | 3-10 | Nutzertraffic | 2-6 |
Formatdifferent | Workshop + async | Workshop + async | Async | Workshop |
Outputdifferent | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | Event Timeline, Causal Factor Chart, Cause List, Corrective Actions | Click Data, Interest Signal, Learning Decision | Root cause notes, Countermeasures |
Tagsno overlap | QualityProblem solvingRoot cause | CausalityIncidentRoot causeTimeline | ValidationExperimentsDemandDiscovery | Root causeIncidentLeanProblem solving |