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Selected:After-Action ReviewFault Tree AnalysisATAM (Architecture Tradeoff Analysis Method)Failure Mode and Effects Analysis
| Criterion |  Operations After-Action Review |  Operations Fault Tree Analysis |  Architecture ATAM (Architecture Tradeoff Analysis Method) |  Operations Failure Mode and Effects Analysis |
|---|---|---|---|---|
Purposedifferent | After missions or project phases with unclear outcomes, the method makes visible what actually happened and what can be learned from it. It separates course, effect, and causes so experience turns into solid improvement. | For a critical top event with several possible triggers, the method logically models failure paths. It makes visible which combinations of conditions can lead to damage. | 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. | For a process, product, or service with noticeable failure risks, the method assesses possible failure modes in advance. It directs attention to combinations of occurrence, effect, and detectability. |
Complexitydifferent | Low | High | High | High |
Timedifferent | 20-45 min | 2-6 h | Several meetings plus preparation and analysis; total effort depends on scope | 2-6 h |
Participantsdifferent | 3-12 | 3-8 | Evaluation team, architects, and relevant stakeholders | 3-10 |
Formatdifferent | Workshop + async | Workshop + async | Workshop + async | Workshop |
Outputdifferent | Lessons learned, Action items, Event summary | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | Prioritized quality scenarios in a utility tree, Architecture risks with reasoning and assumptions, Sensitivity and trade-off points, Findings report with open investigations | FMEA Table, Risk Priority, Mitigation Actions |
Tagsno overlap | LearningOperationsImprovement | RiskRoot causeSafety | ArchitectureQualityRiskTradeoffsStakeholders | RiskQualityOperationsRoot cause |