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| Criterion |  Growth Flywheel |  Growth North Star Metric |  Product Discovery Test Card |  Product Discovery Fake Door Test |
|---|---|---|---|---|
Purposedifferent | Growth often breaks down where a reinforcing mechanism builds up too much friction. A Flywheel shows the cycle of value, repetition, and reinforcement meant to sustain growth. | When product teams track many metrics, the view of the actual customer outcome easily gets lost. A North Star Metric bundles growth, usage, and value contribution into one signal that makes the system's direction visible. | The Test Card turns a critical assumption into a testable claim and specifies in advance which result counts as success. | 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. |
Complexitydifferent | Medium | Medium | Low | Medium |
Timedifferent | 60-120 min | 1-2 h | 20-35 min | 1-5 Tage |
Participantsdifferent | 3-8 | 3-8 | 1-5 | Nutzertraffic |
Formatdifferent | Workshop | Workshop + async | Workshop + async | Async |
Outputdifferent | Flywheel Map, Friction Points, Growth Levers, Experiment Backlog | North Star metric, Input metric tree, Measurement cadence | Test Card with a pre-set threshold | Click Data, Interest Signal, Learning Decision |
Tagsno overlap | GrowthRetentionConversion | GrowthMetricsAlignmentRetention | ExperimentsValidationDiscoveryHypothesis | ValidationExperimentsDemandDiscovery |