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| Criterion |  UX Research User Interviews |  Decision Making DACI |  Architecture Architecture Decision Record |  Architecture Request for Comments |
|---|---|---|---|---|
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. | In cross-functional decisions, responsibilities quickly blur between approval, influence, and execution. DACI arranges these roles so decision pressure, contribution, and information stay cleanly separated. | 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. | An RFC clarifies architecture context, options, and consequences. It structures technical context, alternatives, tradeoffs, open questions, and review feedback, and captures the result as an RFC document, reviewer comments, and a decision rationale. |
Complexitydifferent | Low | Low | Low | Medium |
Timedifferent | 30–60 min per interview | 30-60 min | 15-45 min | 1-3 Wochen vom Draft bis zur Entscheidung |
Participantsdifferent | 1 participant per interview | 2-10 | 1-3 | 3-20 Reviewer |
Formatdifferent | Workshop + async | Workshop + async | Async | Async |
Outputdifferent | Interview Notes, Themes, Insight Summary | DACI Matrix, Decision Owner, Decision Log | ADR File, Decision Log, Rationale | RFC document, Reviewer comments, Decision rationale, Follow-up ADR or tickets |
Tagsno overlap | QualitativeResearchCustomerDiscovery | DecisionRolesGovernanceAlignment | ArchitectureRationaleDocumentationGovernance | ArchitectureDecisionAsyncGovernance |