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| Criterion |  UX Research User Interviews |  Product Strategy DIBB |  Operations MORT Analysis |  Operations 5 Whys |
|---|---|---|---|---|
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. | DIBB helps clarify target groups, value, goals, and priorities by making the logic behind a decision explicit. It captures results as a DIBB document, belief list, bet list, and learning report. | For a safety-relevant event or a system with high protection requirements, the method examines where controls failed. It exposes both technical and organizational gaps. | For a single, hard-to-explain deviation, the method exposes the causal chain behind the visible symptom. It keeps the cause open until a controllable condition emerges instead of a mere description. |
Complexitydifferent | Low | Low | High | Low |
Timedifferent | 30–60 min per interview | 1-2 h | Mehrere Tage bis Wochen | 15-30 min |
Participantsdifferent | 1 participant per interview | 2-8 | 2-6 | 2-6 |
Formatdifferent | Workshop + async | Workshop + async | Workshop + async | Workshop |
Outputdifferent | Interview Notes, Themes, Insight Summary | DIBB document, Belief list, Bet list, Learning report | MORT Worksheets, Findings per Branch, Corrective Actions, Systemic Recommendations | Root cause notes, Countermeasures |
Tagsno overlap | QualitativeResearchCustomerDiscovery | StrategyDecisionAssumptionsHypothesis | Root causeSafetySystemicIncident | Root causeIncidentLeanProblem solving |