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| Criterion |  Decision Making Pre-Mortem |  Delivery Communication Plan |  Architecture Architecture Decision Record |
|---|---|---|---|
Purposedifferent | 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. | 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. |
Complexitysame | Low | Low | Low |
Timedifferent | 20–45 min | 45-90 min | 15-45 min |
Participantsdifferent | Small cross-functional group | 2-6 | 1-3 |
Formatdifferent | Workshop | Workshop + async | Async |
Outputdifferent | Risk list, Mitigation plan, Assumption log | Communication Plan, Channel Matrix, Message Cadence | ADR File, Decision Log, Rationale |
Tagsno overlap | RiskDecisionFailurePlanning | CommunicationStakeholdersDeliveryPlanning | ArchitectureRationaleDocumentationGovernance |
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