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| Criterion |  Facilitation Dot Estimation |  Architecture ATAM (Architecture Tradeoff Analysis Method) |  Agile Ideal Days |  Decision Making PERT Estimation |
|---|---|---|---|---|
Purposedifferent | When size or effort can only be estimated roughly, Dot Estimation condenses the group's experience into a quick range. It turns individual contributions into a visible selection. The result is captured as an Effort Heatmap, Risk Signals, and Discussion Targets. | 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. | When effort needs to be thought of as real working time, it offers a simple common denominator for comparison. It sorts work by value, risk, and delivery ability. The result is captured as Ideal Day Estimates, Assumption Notes, and Capacity Caveats. | 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. |
Complexitydifferent | Low | High | Low | Medium |
Timedifferent | 5-20 min | Several meetings plus preparation and analysis; total effort depends on scope | 15-60 min | 15-45 min |
Participantsdifferent | 3-20 | Evaluation team, architects, and relevant stakeholders | 2-9 | 1-8 |
Formatdifferent | Workshop | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Effort Heatmap, Risk Signals, Discussion Targets | Prioritized quality scenarios in a utility tree, Architecture risks with reasoning and assumptions, Sensitivity and trade-off points, Findings report with open investigations | Ideal Day Estimates, Assumption Notes, Capacity Caveats | PERT Estimate, Expected Value, Risk Notes |
Tagsno overlap | EstimationEffortRisk | ArchitectureQualityRiskTradeoffsStakeholders | EstimationEffortAgile | EstimationUncertaintyRisk |