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| Criterion |  Innovation Double Diamond |  UX Research Tree Testing |  UX Research Usability Testing |  UX Research Card Sorting |
|---|---|---|---|---|
Purposedifferent | For complex problems with a fuzzy situation, the method cleanly separates search space and decision. It first creates breadth in understanding and then focus in elaboration. This brings open questions, problem definition, and solution path into a traceable movement. | When a navigation exists but search paths still fail, tree testing checks findability without visual distraction. The method shows whether labels, levels, and paths really lead to the intended destination. | When a product is built but people get stuck on tasks, usability testing shows the friction at concrete points. Observed use instead of self-report makes visible where orientation, understanding, or interaction breaks down. | When content only makes sense internally and users can't find the structure again, card sorting exposes their mental order. Terms, groups, and naming are then aligned with the target group's expectations. |
Complexitydifferent | Medium | Medium | Medium | Low |
Timedifferent | Wochen bis Monate | 1-2 Tage | 1-2 h je Session | 20-45 min |
Participantsdifferent | 3-12 | Based on research question | Based on research question | Based on research question |
Formatdifferent | Workshop + async | Async | Workshop + async | Workshop + async |
Outputdifferent | Problem Statement, Solution Options, Prototypes, Deliverables per Phase | Findability Metrics, Path Analysis, Revised IA | Usability Issues, Severity List, Recommendations | Content groups, Label set, IA hypotheses |
Tagsno overlap | ProcessDivergenceInnovation | Information architectureNavigationFindability | ValidationUXPrototype | Information architectureNavigationStructure |