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| Criterion |  Operations A3 Problem Solving |  UX Research Affinity Diagramming |  UX Research User Interviews |  Operations 8D Problem Solving |
|---|---|---|---|---|
Purposedifferent | 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. | 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. | When teams derive needs only from assumptions and real motives are missing, user interviews give direct access to behavior and meaning. Conversations from the target group's everyday life make patterns, tensions, and open questions solidly visible. | 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 | Low | Low | High |
Timedifferent | 45-90 min | 45–90 min | 30–60 min per interview | 1-6 Wochen |
Participantsdifferent | 2-5 | 3-10 | 1 participant per interview | 4-10 |
Formatdifferent | Workshop + async | Workshop | Workshop + async | Workshop + async |
Outputdifferent | A3 Report, Action Plan, Root Cause Analysis | Theme clusters, Insight statements, Opportunity areas | Interview Notes, Themes, Insight Summary | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan |
Tagsno overlap | LeanProblem solvingCoachingOperations | SynthesisQualitativeRoot cause | QualitativeResearchCustomerDiscovery | QualityProblem solvingRoot cause |