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| Criterion |  Operations Root Cause Analysis |  UX Research User Interviews |  Operations Barrier Analysis |  Operations Root Cause Tree Analysis |
|---|---|---|---|---|
Purposedifferent | When a problem keeps recurring and the cause stays unclear, the method exposes the underlying mechanism. It separates symptom, guess, and robust explanation from one another. | 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 a risk that can only be managed through multiple layers of protection, the method examines the effectiveness of each barrier. It shows where safeguards are missing, too weak, or fail under real conditions. | For a problem with several suspected causes, the method builds a causal structure instead of a mere list. It makes visible how causes connect and where the strongest points of leverage lie. |
Complexitydifferent | Medium | Low | Medium | Medium |
Timedifferent | 1-4 h | 30–60 min per interview | 2-4 h | 1-3 h |
Participantsdifferent | 3-8 | 1 participant per interview | 2-6 | 2-8 |
Formatdifferent | Workshop + async | Workshop + async | Workshop + async | Workshop |
Outputdifferent | Problem Statement, Cause Hypotheses, Confirmed Causes, Action Plan | Interview Notes, Themes, Insight Summary | Barrier Inventory, Failure Analysis per Barrier, Action Backlog | Cause Tree, Evidence Notes, Countermeasures |
Tagsno overlap | Root causeProblem solvingQualityIncident | QualitativeResearchCustomerDiscovery | Root causeSafetyIncident | Root causeTreeIncidentQuality |