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| Criterion |  Architecture Request for Comments |  Operations 5 Whys |  Operations 8D Problem Solving |  Operations A3 Problem Solving |
|---|---|---|---|---|
Purposedifferent | An RFC clarifies architecture context, options, and consequences. It structures technical context, alternatives, tradeoffs, open questions, and review feedback, and captures the result as an RFC document, reviewer comments, and a decision rationale. | 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 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. | For a complex deviation with several people involved, the method bundles problem, analysis, and decision onto one page. It creates a shared working space where causes, countermeasures, and follow-up fit together. |
Complexitydifferent | Medium | Low | High | Medium |
Timedifferent | 1-3 Wochen vom Draft bis zur Entscheidung | 15-30 min | 1-6 Wochen | 45-90 min |
Participantsdifferent | 3-20 Reviewer | 2-6 | 4-10 | 2-5 |
Formatdifferent | Async | Workshop | Workshop + async | Workshop + async |
Outputdifferent | RFC document, Reviewer comments, Decision rationale, Follow-up ADR or tickets | Root cause notes, Countermeasures | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | A3 Report, Action Plan, Root Cause Analysis |
Tagsno overlap | ArchitectureDecisionAsyncGovernance | Root causeIncidentLeanProblem solving | QualityProblem solvingRoot cause | LeanProblem solvingCoachingOperations |