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| Criterion |  UX Research First-click Testing |  Operations Fault 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 critical top event with several possible triggers, the method logically models failure paths. It makes visible which combinations of conditions can lead to damage. | 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 | High | Low | Medium |
Timedifferent | 1-2 Tage | 2-6 h | 15-30 min | 2-4 h |
Participantsdifferent | 10-30 | 3-8 | 2-6 | 2-6 |
Formatdifferent | Async | Workshop + async | Workshop | Workshop + async |
Outputdifferent | Click Heatmap, Success Rate, Design Recommendations | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | Root cause notes, Countermeasures | Barrier Inventory, Failure Analysis per Barrier, Action Backlog |
Tagsno overlap | UXNavigationFindabilityValidation | RiskRoot causeSafety | Root causeIncidentLeanProblem solving | Root causeSafetyIncident |