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| Criterion |  Agile 4Ls Retrospective |  Agile Starfish Retrospective |  Product Discovery Experiment Canvas |  Product Discovery Learning Card |
|---|---|---|---|---|
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. | When experiments become unreadable after the fact, it arranges hypothesis, signal, and learning goal on a single canvas. It separates problem, assumption, solution, and evidence. The result is captured as a Completed Experiment Canvas and a Success Metric. | The Learning Card connects traceable test results to a reasoned next action while keeping the limits of the insight visible. |
Complexitysame | Low | Low | Low | Low |
Timedifferent | 45–75 min | 45-90 min | 30-60 min | 25-40 min |
Participantsdifferent | Team members involved | 4-12 | 1-5 | 1-5 |
Formatdifferent | Workshop | Workshop | Workshop + async | Workshop + async |
Outputdifferent | 4Ls Board, Learning Themes, Improvement Actions | Starfish Board, Practice Changes, Experiments | Completed Experiment Canvas, Success Metric | Learning Card with evidence and next action |
Tagsno overlap | RetrospectiveLearningReflectionTeam | RetrospectiveImprovementExperimentsTeam | ExperimentsValidationDiscoveryHypothesis | ExperimentsValidationDiscoveryLearning |