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| Criterion |  Product Discovery Fake Door Test |  Engineering Goal Question Metric |  Product Discovery Smoke Test |  Product Strategy Counter Metrics |
|---|---|---|---|---|
Purposedifferent | 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. | Helps clarify technical problems, hypotheses, and next steps in concrete terms. It breaks a technical problem into testable parts. The result is captured as a GQM table and metric briefs. | When demand only needs to be roughly verified, it tests interest with minimal effort. It measures whether people would take a next step at all. | When a headline metric could mask side effects, it adds guardrail signals against unwanted outcomes. It connects customer value, product logic, and decision priorities. The result is captured as a counter-metric list and guardrail definitions. |
Complexitydifferent | Medium | Medium | Low | Low |
Timedifferent | 1-5 Tage | 90-180 min | 1-5 Tage | 30-60 min |
Participantsdifferent | Nutzertraffic | 3-6 | Nutzertraffic | 2-6 |
Formatdifferent | Async | Workshop | Async | Workshop + async |
Outputdifferent | Click Data, Interest Signal, Learning Decision | GQM Table, Metric Profiles | Interest Metrics, Conversion Signal, Learning Note | Counter Metric List, Guardrail Definitions |
Tagsno overlap | ValidationExperimentsDemandDiscovery | MetricsMeasurementEngineeringAlignment | ValidationExperimentsDemandGrowth | MetricsMeasurementStrategyExperiments |