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| Criterion |  Operations 8D Problem Solving |  Architecture ARID (Active Reviews for Intermediate Designs) |  Operations 5 Whys |
|---|---|---|---|
Purposedifferent | 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. | ARID examines how well developers can work with a technical design. It focuses on a part of the system that can still be revised, between the architecture overview and the detailed specification. | 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. |
Complexitydifferent | High | Medium | Low |
Timedifferent | 1-6 Wochen | 2–4 h review as a planning range; preparation and evaluation additional | 15-30 min |
Participantsdifferent | 4-10 | Designers, developers as users, and facilitation | 2-6 |
Formatdifferent | Workshop + async | Workshop + async | Workshop |
Outputdifferent | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | Prioritized development tasks, Jointly produced code or pseudocode, Observed difficulties and open design questions, Proposed design revisions | Root cause notes, Countermeasures |
Tagsno overlap | QualityProblem solvingRoot cause | ArchitectureEngineeringFeedbackValidationTasks | Root causeIncidentLeanProblem solving |
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