There is increasing demand on the education sector to produce high-quality, actionable information to inform decisions aimed at improving student achievement. Unfortunately, every state currently lacks the out-of-state data necessary to follow individuals systemically and efficiently across state lines. The absence of appropriate out-of-state data limits states' ability to produce robust indicators to answer critical questions. It is vital that policymakers understand the impact of the combination of out-of-state mobility and lack of out-of-state student-level data on their ability to provide actionable information to stakeholders in their state. This publication will discuss three high-stakes, high-priority questions currently affecting education and highlight the impact of state-by-state mobility data on the following policy priorities: (1) High school graduation rates; (2) Postsecondary success; and (3) Educator Preparation. (Contains 16 endnotes.) [For a related report "Meeting Policymakers' Education Responsibilities Requires Cross-State Data Collaboration, Sharing, and Comparability. Breaking down State Silos," see ED543121.]