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| Criterion |  Decision Making PERT Estimation |  Architecture ATAM (Architecture Tradeoff Analysis Method) |  Decision Making Assumption Surfacing |
|---|---|---|---|
Purposedifferent | On complex initiatives, a plain average tends to understate just how uncertain the outcome really is. It separates options, evaluation criteria, and open risks. The result is captured as a PERT Estimate, Expected Value, and Risk Notes. | 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. | Plans often contain assumptions that were never openly stated and remain dangerous precisely because of that. Assumption Surfacing makes these silent premises visible and prioritizes which of them carry the initiative or could sink it. |
Complexitydifferent | Medium | High | Low |
Timedifferent | 15-45 min | Several meetings plus preparation and analysis; total effort depends on scope | 45-90 min |
Participantsdifferent | 1-8 | Evaluation team, architects, and relevant stakeholders | 2-8 |
Formatsame | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | PERT Estimate, Expected Value, Risk Notes | Prioritized quality scenarios in a utility tree, Architecture risks with reasoning and assumptions, Sensitivity and trade-off points, Findings report with open investigations | Assumption List, Critical Assumptions, Learning Plan |
Tags1 shared | EstimationUncertaintyRisk | ArchitectureQualityRiskTradeoffsStakeholders | AssumptionsRiskDecisionDiscovery |
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