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| Criterion |  UX Research First-click Testing |  Operations Root Cause Tree Analysis |  Operations 5 Whys |  Operations Barrier Analysis |
|---|---|---|---|---|
Purposedifferent | When users immediately turn the wrong way on a screen or wireframe, first click testing checks initial orientation at high speed. The first click shows early whether expectation, labeling, and wayfinding fit together. | For a problem with several suspected causes, the method builds a causal structure instead of a mere list. It makes visible how causes connect and where the strongest points of leverage lie. | 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. | For a risk that can only be managed through multiple layers of protection, the method examines the effectiveness of each barrier. It shows where safeguards are missing, too weak, or fail under real conditions. |
Complexitydifferent | Low | Medium | Low | Medium |
Timedifferent | 1-2 Tage | 1-3 h | 15-30 min | 2-4 h |
Participantsdifferent | 10-30 | 2-8 | 2-6 | 2-6 |
Formatdifferent | Async | Workshop | Workshop | Workshop + async |
Outputdifferent | Click Heatmap, Success Rate, Design Recommendations | Cause Tree, Evidence Notes, Countermeasures | Root cause notes, Countermeasures | Barrier Inventory, Failure Analysis per Barrier, Action Backlog |
Tagsno overlap | UXNavigationFindabilityValidation | Root causeTreeIncidentQuality | Root causeIncidentLeanProblem solving | Root causeSafetyIncident |