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| Criterion |  UX Research User Interviews |  Architecture Architecture Decision Record |  Operations Root Cause 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. | An ADR permanently records an architecture decision with context, trade-offs, and consequence. It creates continuity for later changes because the decision path stays traceable. | 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. | 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 | Medium | Low |
Timedifferent | 30–60 min per interview | 15-45 min | 1-4 h | 15-30 min |
Participantsdifferent | 1 participant per interview | 1-3 | 3-8 | 2-6 |
Formatdifferent | Workshop + async | Async | Workshop + async | Workshop |
Outputdifferent | Interview Notes, Themes, Insight Summary | ADR File, Decision Log, Rationale | Problem Statement, Cause Hypotheses, Confirmed Causes, Action Plan | Root cause notes, Countermeasures |
Tagsno overlap | QualitativeResearchCustomerDiscovery | ArchitectureRationaleDocumentationGovernance | Root causeProblem solvingQualityIncident | Root causeIncidentLeanProblem solving |