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| Criterion |  Operations PDCA Cycle |  Facilitation Nominal Group Technique |  Operations 5 Whys |  Facilitation 1-2-4-All |
|---|---|---|---|---|
Purposedifferent | For an improvement that still has to prove itself in everyday work, the method runs it through small learning loops. It connects planning, checking, and standardization into a repeatable learning mode. | When loud voices could dominate a round, Nominal Group Technique protects individual thinking time from group effects. It collects ideas separately first and only then enables shared weighting. | 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. | When many people in a group too rarely get to speak, 1-2-4-All distributes thinking time more fairly. The format builds participation step by step and makes quiet or still-unformed thoughts usable faster. |
Complexitydifferent | Low | Medium | Low | Low |
Timedifferent | 1 h bis mehrere Wochen | 60-120 min | 15-30 min | 10-20 min |
Participantsdifferent | 1-8 | 5-12 | 2-6 | 4-100+ |
Formatdifferent | Workshop + async | Workshop | Workshop | Workshop |
Outputdifferent | PDCA Log, Experiment Plan, Learning Outcome, Standard Change | Ranked Ideas, Clarified Options, Group Priority | Root cause notes, Countermeasures | Idea List, Shared Insights, Emergent Themes |
Tagsno overlap | Continuous improvementLeanExperiments | FacilitationPrioritizationVotingInclusion | Root causeIncidentLeanProblem solving | FacilitationInclusionIdeation |