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| Criterion |  UX Research User Interviews |  Operations 8D Problem Solving |  Operations Change Analysis |
|---|---|---|---|
Purposedifferent | 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. | 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. |
Complexitydifferent | Low | High | Medium |
Timedifferent | 30–60 min per interview | 1-6 Wochen | 45-120 min |
Participantsdifferent | 1 participant per interview | 4-10 | 2-6 |
Formatsame | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Interview Notes, Themes, Insight Summary | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | Change Matrix, Cause Hypotheses, Validation Questions, Action List |
Tagsno overlap | QualitativeResearchCustomerDiscovery | QualityProblem solvingRoot cause | ChangeRoot causeTroubleshootingComparison |
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