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Selected:ATAM (Architecture Tradeoff Analysis Method)Kepner-Tregoe 5 Whys Failure Mode and Effects Analysis

Criterion	Architecture ATAM (Architecture Tradeoff Analysis Method)	Operations Kepner-Tregoe	Operations 5 Whys	Operations Failure Mode and Effects Analysis
Purposedifferent	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 disturbance that's hard to pin down, the method cleanly separates problem, cause, and decision. It reduces mixing when symptoms allow several interpretations.	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.	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	High	Low	High
Timedifferent	Several meetings plus preparation and analysis; total effort depends on scope	2-8 h	15-30 min	2-6 h
Participantsdifferent	Evaluation team, architects, and relevant stakeholders	2-8	2-6	3-10
Formatdifferent	Workshop + async	Workshop + async	Workshop	Workshop
Outputdifferent	Prioritized quality scenarios in a utility tree, Architecture risks with reasoning and assumptions, Sensitivity and trade-off points, Findings report with open investigations	Problem Analysis, Decision Analysis, Risk Plan	Root cause notes, Countermeasures	FMEA Table, Risk Priority, Mitigation Actions
Tagsno overlap	ArchitectureQualityRiskTradeoffsStakeholders	Problem solvingRoot causeDecisionOperations	Root causeIncidentLeanProblem solving	RiskQualityOperationsRoot cause

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