Measure — Define and Track Success Overview If you can't define success, you can't design for it. And if you measure the wrong thing, you'll optimize for the wrong outcome. UX measurement connects design decisions to observable evidence — did the thing we built actually help? This skill defines what to measure, how to measure it, and how to make decisions from what you learn. It bridges the gap between "we shipped it" and "it worked." But measurement is not neutral. Every metric you choose shapes what gets optimized. Measure time-on-site and you'll get infinite scroll. Measure clicks and you'…