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| Criterion |  UX Research User Interviews |  Architecture C4 Model |  Product Discovery Test Card |  Product Discovery Learning Card |
|---|---|---|---|---|
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. | The C4 Model makes a system legible across several resolution levels, from context down to code. It suits situations where different audiences need to understand the same architecture from different altitudes. | The Test Card turns a critical assumption into a testable claim and specifies in advance which result counts as success. | The Learning Card connects traceable test results to a reasoned next action while keeping the limits of the insight visible. |
Complexitysame | Low | Low | Low | Low |
Timedifferent | 30–60 min per interview | 1-4 h | 20-35 min | 25-40 min |
Participantsdifferent | 1 participant per interview | 1-5 | 1-5 | 1-5 |
Formatsame | Workshop + async | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Interview Notes, Themes, Insight Summary | Context Diagram, Container Diagram, Component Diagram | Test Card with a pre-set threshold | Learning Card with evidence and next action |
Tagsno overlap | QualitativeResearchCustomerDiscovery | ArchitectureCommunicationVisualization | ExperimentsValidationDiscoveryHypothesis | ExperimentsValidationDiscoveryLearning |