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| Criterion |  Engineering Fault Isolation |  Product Discovery Opportunity Solution Tree |  Product Strategy GIST Planning |  Product Discovery Fake Door Test |
|---|---|---|---|---|
Purposedifferent | In technical failures, the visible symptom often gets mixed up with the actual cause. Fault Isolation narrows the fault space and progressively reduces which part of the system is truly affected. | When discovery keeps swinging between goals, ideas, and learning loops, it creates clear steering logic. It connects the desired outcome, opportunities, and experiments into a legible structure. | GIST Planning helps clarify target groups, value, goals, and priorities. It links customer value, product logic, and decision priorities, and captures the result as goals, an idea bank, and a step-project list. | When demand is still unclear, it measures interest in a feature before it is built. It separates real behavior from polite agreement and deliberately keeps build effort small. |
Complexitysame | Medium | Medium | Medium | Medium |
Timedifferent | 30-180 min | 1-2 h Setup, laufend | Wochen bis Monate je Goal | 1-5 Tage |
Participantsdifferent | 1-6 | 2-6 | 3-10 | Nutzertraffic |
Formatdifferent | Workshop + async | Workshop + async | Workshop + async | Async |
Outputdifferent | Fault Isolation Map, Test Log, Excluded Hypotheses, Narrowed Fault Area | Opportunity Solution Tree, Experiment Backlog, Learning Log | Goals, Idea bank, Step-project list, Tasks, Learning reports | Click Data, Interest Signal, Learning Decision |
Tagsno overlap | TroubleshootingDiagnosisEngineering | DiscoveryOutcomesExperimentsOpportunity | RoadmapOutcomesPlanningExperiments | ValidationExperimentsDemandDiscovery |