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| Criterion |  UX Research Diary Study |  Operations Waste Analysis |  Operations 5 Whys |
|---|---|---|---|
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 process that keeps people busy but creates little value, the method exposes waste. It directs attention to unnecessary movement, waiting times, rework, and overdelivery. | 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 | Low |
Timedifferent | 1-4 Wochen | 45-120 min | 15-30 min |
Participantsdifferent | 5-20 | 2-8 | 2-6 |
Formatdifferent | Async | Workshop | Workshop |
Outputdifferent | Diary Entries, Longitudinal Patterns, Experience Timeline | Waste Map, Prioritized Waste, Improvement Backlog | Root cause notes, Countermeasures |
Tagsno overlap | UX researchTrackingBehavior | WasteLeanProcess improvement | Root causeIncidentLeanProblem solving |
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