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| Criterion |  UX Research Diary Study |  Delivery Value Stream Mapping |  Operations Fishbone Diagram |  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. | When delivery work dissolves into wait times, handoffs, and hidden effort, Value Stream Mapping makes the actual flow visible. The method exposes bottlenecks, idle time, and feedback loops so lead time and improvement levers become tangible. | When a problem has several possible contributing factors, the method sorts causes by cause areas. It prevents an initial hunch from blocking the view of other plausible drivers. | 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 | Medium | Low | Low |
Timedifferent | 1-4 Wochen | 1-3 h | 30-60 min | 15-30 min |
Participantsdifferent | 5-20 | 4-10 | 2-8 | 2-6 |
Formatdifferent | Async | Workshop | Workshop | Workshop |
Outputdifferent | Diary Entries, Longitudinal Patterns, Experience Timeline | Current-state map, Future-state map, Bottleneck list | Fishbone Diagram, Cause Categories, Investigation Backlog | Root cause notes, Countermeasures |
Tagsno overlap | UX researchTrackingBehavior | LeanFlowWasteDelivery | Root causeQualityOperations | Root causeIncidentLeanProblem solving |