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Selected:Fault Tree AnalysisSAAM (Software Architecture Analysis Method)5 WhysATAM (Architecture Tradeoff Analysis Method)
| Criterion |  Operations Fault Tree Analysis |  Architecture SAAM (Software Architecture Analysis Method) |  Operations 5 Whys |  Architecture ATAM (Architecture Tradeoff Analysis Method) |
|---|---|---|---|---|
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. | SAAM helps teams judge an architecture’s suitability for selected tasks and changes. It is particularly useful for examining modifiability and comparing architecture alternatives with clear reasoning. | For a single, hard-to-explain deviation, the method exposes the causal chain behind the visible symptom. It keeps the cause open until a controllable condition emerges instead of a mere description. | 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. |
Complexitydifferent | High | High | Low | High |
Timedifferent | 2-6 h | Preparation, scenario analysis, and findings review; effort depends on scope | 15-30 min | Several meetings plus preparation and analysis; total effort depends on scope |
Participantsdifferent | 3-8 | Architecture experts and stakeholders for scenarios and weighting | 2-6 | Evaluation team, architects, and relevant stakeholders |
Formatdifferent | Workshop + async | Workshop + async | Workshop | Workshop + async |
Outputdifferent | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | Domain functions mapped to components and connections, Quality attributes and evaluation criteria, Typical tasks and their effects on the architecture, Reasoned evaluation or comparison of alternatives | Root cause notes, Countermeasures | Prioritized quality scenarios in a utility tree, Architecture risks with reasoning and assumptions, Sensitivity and trade-off points, Findings report with open investigations |
Tagsno overlap | RiskRoot causeSafety | ArchitectureChangeAnalysisComparisonQuality | Root causeIncidentLeanProblem solving | ArchitectureQualityRiskTradeoffsStakeholders |