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| Criterion |  Operations Fault Tree Analysis |  Operations ALPEN Method |  Operations Kepner-Tregoe |  Operations 5 Whys |
|---|---|---|---|---|
Purposedifferent | For a critical top event with several possible triggers, the method logically models failure paths. It makes visible which combinations of conditions can lead to damage. | 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 disturbance that's hard to pin down, the method cleanly separates problem, cause, and decision. It reduces mixing when symptoms allow several interpretations. | 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 | Low | High | Low |
Timedifferent | 2-6 h | 10-20 min daily | 2-8 h | 15-30 min |
Participantsdifferent | 3-8 | 1 | 2-8 | 2-6 |
Formatdifferent | Workshop + async | Async | Workshop + async | Workshop |
Outputdifferent | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | Daily Plan, Time Estimates, Review Notes | Problem Analysis, Decision Analysis, Risk Plan | Root cause notes, Countermeasures |
Tagsno overlap | RiskRoot causeSafety | PlanningTime managementProductivityOperations | Problem solvingRoot causeDecisionOperations | Root causeIncidentLeanProblem solving |