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| Criterion |  Operations Root Cause Tree Analysis |  Operations Failure Mode and Effects Analysis |  Operations ALPEN Method |  Operations 5 Whys |
|---|---|---|---|---|
Purposedifferent | 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. | For a process, product, or service with noticeable failure risks, the method assesses possible failure modes in advance. It directs attention to combinations of occurrence, effect, and detectability. | With an overloaded day full of too many tasks, a realistic picture of the day emerges. The method connects estimating, deciding, and buffer thinking so planning fits available energy and time. | 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 | Medium | High | Low | Low |
Timedifferent | 1-3 h | 2-6 h | 10-20 min daily | 15-30 min |
Participantsdifferent | 2-8 | 3-10 | 1 | 2-6 |
Formatdifferent | Workshop | Workshop | Async | Workshop |
Outputdifferent | Cause Tree, Evidence Notes, Countermeasures | FMEA Table, Risk Priority, Mitigation Actions | Daily Plan, Time Estimates, Review Notes | Root cause notes, Countermeasures |
Tagsno overlap | Root causeTreeIncidentQuality | RiskQualityOperationsRoot cause | PlanningTime managementProductivityOperations | Root causeIncidentLeanProblem solving |