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| Criterion |  UX Research Tree Testing |  UX Research Empathy Mapping |  Operations Root Cause Analysis |  Operations 5 Whys |
|---|---|---|---|---|
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. | When a lot is assumed about a target group but little is seen jointly, empathy mapping makes knowledge and gaps directly comparable. The picture also shows which assumptions hold up and where evidence is missing. | 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. | 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 | Low | Medium | Low |
Timedifferent | 1-2 Tage | 30–60 min | 1-4 h | 15-30 min |
Participantsdifferent | Based on research question | 4-8 | 3-8 | 2-6 |
Formatdifferent | Async | Workshop | Workshop + async | Workshop |
Outputdifferent | Findability Metrics, Path Analysis, Revised IA | Empathy Map, Assumptions List, Research Gaps | Problem Statement, Cause Hypotheses, Confirmed Causes, Action Plan | Root cause notes, Countermeasures |
Tagsno overlap | Information architectureNavigationFindability | SynthesisQualitativeWorkshop | Root causeProblem solvingQualityIncident | Root causeIncidentLeanProblem solving |