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| Criterion |  Operations 5 Whys |  Operations Root Cause Tree Analysis |  Decision Making DACI |
|---|---|---|---|
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. | For a problem with several suspected causes, the method builds a causal structure instead of a mere list. It makes visible how causes connect and where the strongest points of leverage lie. | In cross-functional decisions, responsibilities quickly blur between approval, influence, and execution. DACI arranges these roles so decision pressure, contribution, and information stay cleanly separated. |
Complexitydifferent | Low | Medium | Low |
Timedifferent | 15-30 min | 1-3 h | 30-60 min |
Participantsdifferent | 2-6 | 2-8 | 2-10 |
Formatdifferent | Workshop | Workshop | Workshop + async |
Outputdifferent | Root cause notes, Countermeasures | Cause Tree, Evidence Notes, Countermeasures | DACI Matrix, Decision Owner, Decision Log |
Tagsno overlap | Root causeIncidentLeanProblem solving | Root causeTreeIncidentQuality | DecisionRolesGovernanceAlignment |
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