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| Criterion |  Delivery Communication Plan |  Architecture Architecture Decision Record |  Decision Making Pre-Mortem |
|---|---|---|---|
Purposedifferent | When many people need to be informed in parallel and messages would otherwise arrive unevenly or too late, a Communication Plan orders communication reliably. Channels, audiences, and cadences interlock so important information doesn't get lost. | 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. | In early initiatives with many uncertainties, planning quickly turns too optimistic. A pre-mortem makes the expected failure visible in advance and sharpens the view of causes, gaps, and countermeasures. |
Complexitysame | Low | Low | Low |
Timedifferent | 45-90 min | 15-45 min | 20–45 min |
Participantsdifferent | 2-6 | 1-3 | Small cross-functional group |
Formatdifferent | Workshop + async | Async | Workshop |
Outputdifferent | Communication Plan, Channel Matrix, Message Cadence | ADR File, Decision Log, Rationale | Risk list, Mitigation plan, Assumption log |
Tagsno overlap | CommunicationStakeholdersDeliveryPlanning | ArchitectureRationaleDocumentationGovernance | RiskDecisionFailurePlanning |
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