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| Criterion |  UX Research Diary Study |  Operations 8D Problem Solving |  Systems Thinking Causal Loop 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. | 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. | A Causal Loop Diagram makes feedback, reinforcement, and balance in a system legible. It uncovers side effects and self-reinforcement that stay hidden in linear explanations. | 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 | High | Medium | Low |
Timedifferent | 1-4 Wochen | 1-6 Wochen | 1-3 h | 15-30 min |
Participantsdifferent | 5-20 | 4-10 | 2-8 | 2-6 |
Formatdifferent | Async | Workshop + async | Workshop | Workshop |
Outputdifferent | Diary Entries, Longitudinal Patterns, Experience Timeline | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | Causal Loop Diagram, Feedback Notes, Leverage Points | Root cause notes, Countermeasures |
Tagsno overlap | UX researchTrackingBehavior | QualityProblem solvingRoot cause | FeedbackSystems thinkingCausalityDynamics | Root causeIncidentLeanProblem solving |