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Selected:Fault Tree AnalysisRoot Cause AnalysisATAM (Architecture Tradeoff Analysis Method)Barrier Analysis
| Criterion |  Operations Fault Tree Analysis |  Operations Root Cause Analysis |  Architecture ATAM (Architecture Tradeoff Analysis Method) |  Operations Barrier 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 a problem keeps recurring and the cause stays unclear, the method exposes the underlying mechanism. It separates symptom, guess, and robust explanation from one another. | 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 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. |
Complexitydifferent | High | Medium | High | Medium |
Timedifferent | 2-6 h | 1-4 h | Several meetings plus preparation and analysis; total effort depends on scope | 2-4 h |
Participantsdifferent | 3-8 | 3-8 | Evaluation team, architects, and relevant stakeholders | 2-6 |
Formatsame | Workshop + async | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | Problem Statement, Cause Hypotheses, Confirmed Causes, Action Plan | Prioritized quality scenarios in a utility tree, Architecture risks with reasoning and assumptions, Sensitivity and trade-off points, Findings report with open investigations | Barrier Inventory, Failure Analysis per Barrier, Action Backlog |
Tagsno overlap | RiskRoot causeSafety | Root causeProblem solvingQualityIncident | ArchitectureQualityRiskTradeoffsStakeholders | Root causeSafetyIncident |