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| Criterion |  Architecture C4 Model |  Architecture ATAM (Architecture Tradeoff Analysis Method) |  Decision Making Pre-Mortem |  Delivery Communication Plan |
|---|---|---|---|---|
Purposedifferent | 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. | ATAM helps teams weigh architecture decisions when quality goals compete. The team considers business goals, stakeholder expectations, and technical decisions together. The evaluation shows which risks need further investigation. | 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. |
Complexitydifferent | Low | High | Low | Low |
Timedifferent | 1-4 h | Several meetings plus preparation and analysis; total effort depends on scope | 20–45 min | 45-90 min |
Participantsdifferent | 1-5 | Evaluation team, architects, and relevant stakeholders | Small cross-functional group | 2-6 |
Formatdifferent | Workshop + async | Workshop + async | Workshop | Workshop + async |
Outputdifferent | Context Diagram, Container Diagram, Component Diagram | Prioritized quality scenarios in a utility tree, Architecture risks with reasoning and assumptions, Sensitivity and trade-off points, Findings report with open investigations | Risk list, Mitigation plan, Assumption log | Communication Plan, Channel Matrix, Message Cadence |
Tagsno overlap | ArchitectureCommunicationVisualization | ArchitectureQualityRiskTradeoffsStakeholders | RiskDecisionFailurePlanning | CommunicationStakeholdersDeliveryPlanning |