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| Criterion |  UX Research User Interviews |  Operations Fishbone Diagram |  Operations Kepner-Tregoe |
|---|---|---|---|
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 disturbance that's hard to pin down, the method cleanly separates problem, cause, and decision. It reduces mixing when symptoms allow several interpretations. |
Complexitydifferent | Low | Low | High |
Timedifferent | 30–60 min per interview | 30-60 min | 2-8 h |
Participantsdifferent | 1 participant per interview | 2-8 | 2-8 |
Formatdifferent | Workshop + async | Workshop | Workshop + async |
Outputdifferent | Interview Notes, Themes, Insight Summary | Fishbone Diagram, Cause Categories, Investigation Backlog | Problem Analysis, Decision Analysis, Risk Plan |
Tagsno overlap | QualitativeResearchCustomerDiscovery | Root causeQualityOperations | Problem solvingRoot causeDecisionOperations |
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