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| Criterion |  UX Research User Interviews |  Operations Fishbone Diagram |  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. | When a problem has several possible contributing factors, the method sorts causes by cause areas. It prevents an initial hunch from blocking the view of other plausible drivers. | 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 | Low | Medium |
Timedifferent | 30–60 min per interview | 30-60 min | 45-120 min |
Participantsdifferent | 1 participant per interview | 2-8 | 2-6 |
Formatdifferent | Workshop + async | Workshop | Workshop + async |
Outputdifferent | Interview Notes, Themes, Insight Summary | Fishbone Diagram, Cause Categories, Investigation Backlog | Change Matrix, Cause Hypotheses, Validation Questions, Action List |
Tagsno overlap | QualitativeResearchCustomerDiscovery | Root causeQualityOperations | ChangeRoot causeTroubleshootingComparison |
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