Production outcome — measured after release in live analytics or operations. Usability-test result — observed in a stated participant sample and task set. Design output — screens, flows and components delivered. Platform scale — the reach of the product, which is context rather than design impact on its own. Team leadership — the people and delivery I was accountable for. Business results on these platforms also depended on product, engineering, operations and marketing decisions; each case study says which part the design work drove.