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| Criterion |  UX Research Tree Testing |  Operations 8D Problem Solving |  Operations Failure Mode and Effects Analysis |  Operations Root Cause Analysis |
|---|---|---|---|---|
Purposedifferent | When a navigation exists but search paths still fail, tree testing checks findability without visual distraction. The method shows whether labels, levels, and paths really lead to the intended destination. | 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 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. | When a problem keeps recurring and the cause stays unclear, the method exposes the underlying mechanism. It separates symptom, guess, and robust explanation from one another. |
Complexitydifferent | Medium | High | High | Medium |
Timedifferent | 1-2 Tage | 1-6 Wochen | 2-6 h | 1-4 h |
Participantsdifferent | Based on research question | 4-10 | 3-10 | 3-8 |
Formatdifferent | Async | Workshop + async | Workshop | Workshop + async |
Outputdifferent | Findability Metrics, Path Analysis, Revised IA | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | FMEA Table, Risk Priority, Mitigation Actions | Problem Statement, Cause Hypotheses, Confirmed Causes, Action Plan |
Tagsno overlap | Information architectureNavigationFindability | QualityProblem solvingRoot cause | RiskQualityOperationsRoot cause | Root causeProblem solvingQualityIncident |