States have responsibilities to ensure that transferring students receive uninterrupted education and services, produce indicators that provide a complete picture, and ensure that information is comparable across states. However, states' and districts' ability to meet these responsibilities requires data capacity that can be undermined due to significant mobility of students and teachers across state lines and lack of comparability across states. It is vital that policymakers understand these challenges and work with other state policymakers to standardize education data, support student record exchanges, share limited and appropriate data across state lines, and define and use common metrics. Just as state policymakers worked together on a common-sense solution to the need for common state standards, it is critical that state policymakers take the lead in finding collaborative solutions to states' interdependent data challenges. (Contains 8 endnotes.) [For related report, "Limited Out-of-State Data Needed to Produce Robust Indicators. Breaking down State Silos," see ED543120.]