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| Criterion |  UX Research Diary Study |  Operations Change Analysis |  UX Research Affinity Diagramming |  Operations 8D Problem Solving |
|---|---|---|---|---|
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 deviation after a change, the method isolates the influence of the altered condition. It narrows down which differences are relevant and which are just accompanying noise. | When research notes, feedback, or observations sit unconnected side by side, affinity diagramming sorts the raw material into solid themes. Many individual points turn into patterns that make decisions and opportunities clearer. | For an acute quality or delivery problem, the method structures immediate protection and root cause work together. It keeps the situation stable while the actual cause is investigated cleanly. |
Complexitydifferent | Medium | Medium | Low | High |
Timedifferent | 1-4 Wochen | 45-120 min | 45–90 min | 1-6 Wochen |
Participantsdifferent | 5-20 | 2-6 | 3-10 | 4-10 |
Formatdifferent | Async | Workshop + async | Workshop | Workshop + async |
Outputdifferent | Diary Entries, Longitudinal Patterns, Experience Timeline | Change Matrix, Cause Hypotheses, Validation Questions, Action List | Theme clusters, Insight statements, Opportunity areas | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan |
Tagsno overlap | UX researchTrackingBehavior | ChangeRoot causeTroubleshootingComparison | SynthesisQualitativeRoot cause | QualityProblem solvingRoot cause |