This document outlines Kate Rutter's presentation on measuring what matters from a UX perspective at UX Days Tokyo on April 19, 2015. The presentation guides attendees through an exercise to create a product snapshot, envision key user interactions, and identify metrics that measure progress on the most important interaction. The goal is to help product teams select metrics that are user-centered and will drive improvements based on real user needs and behaviors rather than just vanity metrics. Attendees work individually and in pairs to create snapshots of existing or hypothetical products and identify metrics focused on measuring a key interaction's success.