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| Criterion |  Operations 5 Whys |  Product Discovery Test Card |
|---|---|---|
Purposedifferent | For a single, hard-to-explain deviation, the method exposes the causal chain behind the visible symptom. It keeps the cause open until a controllable condition emerges instead of a mere description. | The Test Card turns a critical assumption into a testable claim and specifies in advance which result counts as success. |
Complexitysame | Low | Low |
Timedifferent | 15-30 min | 20-35 min |
Participantsdifferent | 2-6 | 1-5 |
Formatdifferent | Workshop | Workshop + async |
Outputdifferent | Root cause notes, Countermeasures | Test Card with a pre-set threshold |
Tagsno overlap | Root causeIncidentLeanProblem solving | ExperimentsValidationDiscoveryHypothesis |
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