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| Criterion |  Agile Starfish Retrospective |  Product Discovery Experiment Canvas |  Agile Start Stop Continue |  Product Discovery Test Card |
|---|---|---|---|---|
Purposedifferent | 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. | When a team wants to deliberately adjust its working behavior, it makes habits visible and assessable. It focuses on concrete changes instead of diffuse mood. | The Test Card turns a critical assumption into a testable claim and specifies in advance which result counts as success. |
Complexitysame | Low | Low | Low | Low |
Timedifferent | 45-90 min | 30-60 min | 30-60 min | 20-35 min |
Participantsdifferent | 4-12 | 1-5 | 3-12 | 1-5 |
Formatdifferent | Workshop | Workshop + async | Workshop | Workshop + async |
Outputdifferent | Starfish Board, Practice Changes, Experiments | Completed Experiment Canvas, Success Metric | Start Stop Continue Board, Improvement Actions | Test Card with a pre-set threshold |
Tagsno overlap | RetrospectiveImprovementExperimentsTeam | ExperimentsValidationDiscoveryHypothesis | RetrospectiveImprovementTeamReflection | ExperimentsValidationDiscoveryHypothesis |