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| Criterion |  UX Research Diary Study |  Operations Kaizen Event |  Operations A3 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 tightly scoped process segment with noticeable waste, the method bundles shared energy for change. It suits situations that call for fast learning loops and visible adjustments. | For a complex deviation with several people involved, the method bundles problem, analysis, and decision onto one page. It creates a shared working space where causes, countermeasures, and follow-up fit together. |
Complexitysame | Medium | Medium | Medium |
Timedifferent | 1-4 Wochen | 0.5-5 Tage | 45-90 min |
Participantsdifferent | 5-20 | 4-10 | 2-5 |
Formatdifferent | Async | Workshop | Workshop + async |
Outputdifferent | Diary Entries, Longitudinal Patterns, Experience Timeline | Kaizen Charter, Waste List, Improvement Experiments, Standard Work Update | A3 Report, Action Plan, Root Cause Analysis |
Tagsno overlap | UX researchTrackingBehavior | LeanContinuous improvementOperations | LeanProblem solvingCoachingOperations |
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