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| Criterion |  Architecture Architecture Decision Record |  Agile 4Ls Retrospective |  Architecture Request for Comments |  Architecture arc42 |
|---|---|---|---|---|
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 a sprint should not only be assessed but also learned from, it captures experience in clear learning categories. It records what worked, what's missing, and what should run differently next time. | 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. | arc42 structures architecture knowledge so teams can document system, decisions, and risks consistently. The template builds a living understanding of the architecture instead of scattered notes. |
Complexitydifferent | Low | Low | Medium | Low |
Timedifferent | 15-45 min | 45–75 min | 1-3 Wochen vom Draft bis zur Entscheidung | 1-2 Tage |
Participantsdifferent | 1-3 | Team members involved | 3-20 Reviewer | 1-4 |
Formatdifferent | Async | Workshop | Async | Workshop + async |
Outputdifferent | ADR File, Decision Log, Rationale | 4Ls Board, Learning Themes, Improvement Actions | RFC document, Reviewer comments, Decision rationale, Follow-up ADR or tickets | Architecture Document, Context View, Runtime View, Deployment View |
Tagsno overlap | ArchitectureRationaleDocumentationGovernance | RetrospectiveLearningReflectionTeam | ArchitectureDecisionAsyncGovernance | ArchitectureDocumentationCommunication |