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Selected:Causal Factor Analysis5 WhysATAM (Architecture Tradeoff Analysis Method)Failure Mode and Effects Analysis
| Criterion |  Operations Causal Factor Analysis |  Operations 5 Whys |  Architecture ATAM (Architecture Tradeoff Analysis Method) |  Operations Failure Mode and Effects Analysis |
|---|---|---|---|---|
Purposedifferent | For an event with a complicated course, the method breaks down the contributing factors along the timeline. It shows how conditions, decisions, and reactions together produce a course of events. | 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. | 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 | 15-30 min | Several meetings plus preparation and analysis; total effort depends on scope | 2-6 h |
Participantsdifferent | 3-10 | 2-6 | Evaluation team, architects, and relevant stakeholders | 3-10 |
Formatdifferent | Workshop + async | Workshop | Workshop + async | Workshop |
Outputdifferent | Event Timeline, Causal Factor Chart, Cause List, Corrective Actions | 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 | FMEA Table, Risk Priority, Mitigation Actions |
Tagsno overlap | CausalityIncidentRoot causeTimeline | Root causeIncidentLeanProblem solving | ArchitectureQualityRiskTradeoffsStakeholders | RiskQualityOperationsRoot cause |