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| Criterion |  Agile 4Ls Retrospective |  Agile Starfish Retrospective |  Product Discovery Learning Card |  Product Discovery Fake Door Test |
|---|---|---|---|---|
Purposedifferent | When a sprint should not only be assessed but also learned from, it captures experience in clear learning categories. It records what worked, what's missing, and what should run differently next time. | When improvement options need to be sorted more finely than just start and stop, it brings observations into clear kinds of action. This makes visible what should be done more, less, newly, or continued. | The Learning Card connects traceable test results to a reasoned next action while keeping the limits of the insight visible. | 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 | Low | Low | Low | Medium |
Timedifferent | 45–75 min | 45-90 min | 25-40 min | 1-5 Tage |
Participantsdifferent | Team members involved | 4-12 | 1-5 | Nutzertraffic |
Formatdifferent | Workshop | Workshop | Workshop + async | Async |
Outputdifferent | 4Ls Board, Learning Themes, Improvement Actions | Starfish Board, Practice Changes, Experiments | Learning Card with evidence and next action | Click Data, Interest Signal, Learning Decision |
Tagsno overlap | RetrospectiveLearningReflectionTeam | RetrospectiveImprovementExperimentsTeam | ExperimentsValidationDiscoveryLearning | ValidationExperimentsDemandDiscovery |