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| Criterion |  Operations 5 Whys |  Operations Ivy Lee Method |  Innovation Lean Startup |  Operations 8D Problem Solving |
|---|---|---|---|---|
Purposedifferent | 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. | With a restless workday full of too many open items, the method creates radical simplicity. It directs attention to a short sequence instead of a broad, still-open field. | For uncertain business assumptions, the method forces the idea into contact with real market reactions early. It separates wishful picture, assumption, and observable behavior, so that learning becomes faster than planning. This translates uncertainty into measurable insight. | 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. |
Complexitydifferent | Low | Low | Medium | High |
Timedifferent | 15-30 min | 5-10 min daily | Wochen bis Monate je Lernzyklus | 1-6 Wochen |
Participantsdifferent | 2-6 | 1 | 2-8 | 4-10 |
Formatdifferent | Workshop | Async | Workshop + async | Workshop + async |
Outputdifferent | Root cause notes, Countermeasures | Daily Priority List, Completion Notes | Hypothesis list, MVPs, Learning reports, Pivot or persevere decision | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan |
Tagsno overlap | Root causeIncidentLeanProblem solving | PrioritizationProductivityExecution | LeanStartupValidationMVP | QualityProblem solvingRoot cause |