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| Criterion |  UX Research Diary Study |  Operations A3 Problem Solving |  Product Discovery Product Kata |  Operations Gemba Walk |
|---|---|---|---|---|
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 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. | Product Kata helps clarify customer problems, solution ideas, and evidence through a repeatable improvement routine. It captures direction, current metric, target metric, experiment notes, and learning. | When there is uncertainty about the real course of a process, the method brings observation to the place where work happens. It combines perception, follow-up questions, and process knowledge so decisions rest on actual workflows instead of assumptions. |
Complexitydifferent | Medium | Medium | Medium | Low |
Timedifferent | 1-4 Wochen | 45-90 min | 1-2 Wochen je Loop | 30-120 min |
Participantsdifferent | 5-20 | 2-5 | 3-10 | 2-6 |
Formatdifferent | Async | Workshop + async | Workshop + async | Workshop |
Outputdifferent | Diary Entries, Longitudinal Patterns, Experience Timeline | A3 Report, Action Plan, Root Cause Analysis | Direction, Current metric, Target metric, Experiment note, Learning report | Observation Notes, Improvement Ideas |
Tagsno overlap | UX researchTrackingBehavior | LeanProblem solvingCoachingOperations | OutcomesDiscoveryLearningIterationCoaching | LeanObservationProcessOperations |