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| Criterion |  Agile 4Ls Retrospective |  Product Discovery MVP Test Matrix |  Product Discovery Test 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 several minimal variants compete to answer the same question, it makes comparing and choosing between them cleaner. It separates problem, assumption, solution, and evidence. The result is captured as a Test Matrix and a Test Plan. | The Test Card turns a critical assumption into a testable claim and specifies in advance which result counts as success. |
Complexitydifferent | Low | Medium | Low |
Timedifferent | 45–75 min | 45-75 min | 20-35 min |
Participantsdifferent | Team members involved | 2-8 | 1-5 |
Formatdifferent | Workshop | Workshop | Workshop + async |
Outputdifferent | 4Ls Board, Learning Themes, Improvement Actions | Test Matrix, Test Plan | Test Card with a pre-set threshold |
Tagsno overlap | RetrospectiveLearningReflectionTeam | ExperimentsValidationDiscoveryOptions | ExperimentsValidationDiscoveryHypothesis |
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