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| Criterion |  UX Research Diary Study |  Operations MORT Analysis |  Operations 5 Whys |  Operations Barrier Analysis |
|---|---|---|---|---|
Purposedifferent | When experiences build up over days or weeks and a single session cannot capture them, Diary Study records the course of everyday life. Recurring triggers, moods, and habits become visible this way, beyond the sharpness of memory. | For a safety-relevant event or a system with high protection requirements, the method examines where controls failed. It exposes both technical and organizational gaps. | 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 | Medium | High | Low | Medium |
Timedifferent | 1-4 Wochen | Mehrere Tage bis Wochen | 15-30 min | 2-4 h |
Participantsdifferent | 5-20 | 2-6 | 2-6 | 2-6 |
Formatdifferent | Async | Workshop + async | Workshop | Workshop + async |
Outputdifferent | Diary Entries, Longitudinal Patterns, Experience Timeline | MORT Worksheets, Findings per Branch, Corrective Actions, Systemic Recommendations | Root cause notes, Countermeasures | Barrier Inventory, Failure Analysis per Barrier, Action Backlog |
Tagsno overlap | UX researchTrackingBehavior | Root causeSafetySystemicIncident | Root causeIncidentLeanProblem solving | Root causeSafetyIncident |