This document discusses Microsoft's use of data-driven user research methods for game development. It summarizes different types of data collected, including in-game telemetry, Xbox Live usage data, and online forum discussions. Examples are provided of analyses conducted on data from games like Project Gotham Racing 4 and Halo 3 to understand player behavior and identify underutilized game elements. The goal is to better understand the player experience and Xbox ecosystem to inform game design and personalization.