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Selected:Fault Tree AnalysisExpectation MappingATAM (Architecture Tradeoff Analysis Method)Failure Mode and Effects Analysis
| Criterion |  Operations Fault Tree Analysis |  Facilitation Expectation Mapping |  Architecture ATAM (Architecture Tradeoff Analysis Method) |  Operations Failure Mode and Effects Analysis |
|---|---|---|---|---|
Purposedifferent | 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. | When roles, interfaces, or projects fail because of differing expectations, Expectation Mapping surfaces these differences. It shows what each side takes for granted and where the pictures diverge. | 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 | High | Low | High | High |
Timedifferent | 2-6 h | 45-90 min | Several meetings plus preparation and analysis; total effort depends on scope | 2-6 h |
Participantsdifferent | 3-8 | 3-12 | Evaluation team, architects, and relevant stakeholders | 3-10 |
Formatdifferent | Workshop + async | Workshop | Workshop + async | Workshop |
Outputdifferent | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | Expectation Map, Alignment Notes, Agreements | 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 | RiskRoot causeSafety | AlignmentStakeholdersTeam | ArchitectureQualityRiskTradeoffsStakeholders | RiskQualityOperationsRoot cause |