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| Criterion |  Agile Start Stop Continue |  Agile Starfish Retrospective |  Product Discovery Experiment Canvas |  Product Discovery Test Card |
|---|---|---|---|---|
Purposedifferent | 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. | 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 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 | 30-60 min | 45-90 min | 30-60 min | 20-35 min |
Participantsdifferent | 3-12 | 4-12 | 1-5 | 1-5 |
Formatdifferent | Workshop | Workshop | Workshop + async | Workshop + async |
Outputdifferent | Start Stop Continue Board, Improvement Actions | Starfish Board, Practice Changes, Experiments | Completed Experiment Canvas, Success Metric | Test Card with a pre-set threshold |
Tagsno overlap | RetrospectiveImprovementTeamReflection | RetrospectiveImprovementExperimentsTeam | ExperimentsValidationDiscoveryHypothesis | ExperimentsValidationDiscoveryHypothesis |