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Selected:Failure Scenario AnalysisBarrier AnalysisATAM (Architecture Tradeoff Analysis Method)Fault Tree Analysis
| Criterion |  Engineering Failure Scenario Analysis |  Operations Barrier Analysis |  Architecture ATAM (Architecture Tradeoff Analysis Method) |  Operations Fault Tree Analysis |
|---|---|---|---|---|
Purposedifferent | In critical processes, it is not enough to plan only for the normal case. Failure Scenario Analysis looks at the path into failure and shows which failures, chains, and control gaps cause the most damage. | For a risk that can only be managed through multiple layers of protection, the method examines the effectiveness of each barrier. It shows where safeguards are missing, too weak, or fail under real conditions. | 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 critical top event with several possible triggers, the method logically models failure paths. It makes visible which combinations of conditions can lead to damage. |
Complexitydifferent | Medium | Medium | High | High |
Timedifferent | 1-3 h | 2-4 h | Several meetings plus preparation and analysis; total effort depends on scope | 2-6 h |
Participantsdifferent | 3-8 | 2-6 | Evaluation team, architects, and relevant stakeholders | 3-8 |
Formatdifferent | Workshop | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Failure Scenarios, Risk Notes, Control Gaps, Test and Response Actions | Barrier Inventory, Failure Analysis per Barrier, Action Backlog | Prioritized quality scenarios in a utility tree, Architecture risks with reasoning and assumptions, Sensitivity and trade-off points, Findings report with open investigations | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions |
Tagsno overlap | FailureResilienceRisk | Root causeSafetyIncident | ArchitectureQualityRiskTradeoffsStakeholders | RiskRoot causeSafety |