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| Criterion |  Architecture Architecture Decision Record |  UX Research User Interviews |  Product Discovery MVP Test Matrix |
|---|---|---|---|
Purposedifferent | 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 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 several minimal variants compete to answer the same question, it makes comparing and choosing between them cleaner. It separates problem, assumption, solution, and evidence. The result is captured as a Test Matrix and a Test Plan. |
Complexitydifferent | Low | Low | Medium |
Timedifferent | 15-45 min | 30–60 min per interview | 45-75 min |
Participantsdifferent | 1-3 | 1 participant per interview | 2-8 |
Formatdifferent | Async | Workshop + async | Workshop |
Outputdifferent | ADR File, Decision Log, Rationale | Interview Notes, Themes, Insight Summary | Test Matrix, Test Plan |
Tagsno overlap | ArchitectureRationaleDocumentationGovernance | QualitativeResearchCustomerDiscovery | ExperimentsValidationDiscoveryOptions |
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