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| Criterion |  Product Discovery Problem Interview |  Operations Gemba Walk |  Product Discovery Test Card |
|---|---|---|---|
Purposedifferent | When the picture of the problem still needs to become solid, it asks about real situations and consequences. It separates genuine suffering from mere interest in a solution. | When there is uncertainty about the real course of a process, the method brings observation to the place where work happens. It combines perception, follow-up questions, and process knowledge so decisions rest on actual workflows instead of assumptions. | The Test Card turns a critical assumption into a testable claim and specifies in advance which result counts as success. |
Complexitydifferent | Medium | Low | Low |
Timedifferent | 30-60 min je Interview | 30-120 min | 20-35 min |
Participantsdifferent | 5-12 Interviews | 2-6 | 1-5 |
Formatdifferent | Workshop + async | Workshop | Workshop + async |
Outputdifferent | Problem Evidence, Risk Notes, Customer Segments | Observation Notes, Improvement Ideas | Test Card with a pre-set threshold |
Tagsno overlap | DiscoveryInterviewsValidation | LeanObservationProcessOperations | ExperimentsValidationDiscoveryHypothesis |
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