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Criterion	Operations Change Analysis	Operations 8D Problem Solving	Architecture Architecture Decision Record	Operations Failure Mode and Effects Analysis
Purposedifferent	For a deviation after a change, the method isolates the influence of the altered condition. It narrows down which differences are relevant and which are just accompanying noise.	For an acute quality or delivery problem, the method structures immediate protection and root cause work together. It keeps the situation stable while the actual cause is investigated cleanly.	An ADR permanently records an architecture decision with context, trade-offs, and consequence. It creates continuity for later changes because the decision path stays traceable.	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	Medium	High	Low	High
Timedifferent	45-120 min	1-6 Wochen	15-45 min	2-6 h
Participantsdifferent	2-6	4-10	1-3	3-10
Formatdifferent	Workshop + async	Workshop + async	Async	Workshop
Outputdifferent	Change Matrix, Cause Hypotheses, Validation Questions, Action List	8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan	ADR File, Decision Log, Rationale	FMEA Table, Risk Priority, Mitigation Actions
Tagsno overlap	ChangeRoot causeTroubleshootingComparison	QualityProblem solvingRoot cause	ArchitectureRationaleDocumentationGovernance	RiskQualityOperationsRoot cause