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| Criterion |  Architecture Architecture Decision Record |  Architecture C4 Model |  Agile Sailboat Retrospective |  Agile Starfish Retrospective |
|---|---|---|---|---|
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. | 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. | When a team wants to read momentum, brakes, and risks together, it offers an easily understandable picture of the situation. It makes drive, obstacles, and headwind visible in the same picture. | When improvement options need to be sorted more finely than just start and stop, it brings observations into clear kinds of action. This makes visible what should be done more, less, newly, or continued. |
Complexitysame | Low | Low | Low | Low |
Timedifferent | 15-45 min | 1-4 h | 45-90 min | 45-90 min |
Participantsdifferent | 1-3 | 1-5 | 4-12 | 4-12 |
Formatdifferent | Async | Workshop + async | Workshop | Workshop |
Outputdifferent | ADR File, Decision Log, Rationale | Context Diagram, Container Diagram, Component Diagram | Sailboat Board, Risks, Improvement Actions | Starfish Board, Practice Changes, Experiments |
Tagsno overlap | ArchitectureRationaleDocumentationGovernance | ArchitectureCommunicationVisualization | RetrospectiveTeamImprovement | RetrospectiveImprovementExperimentsTeam |