CA is shifting the responsibility for school improvement to local school districts with County Offices of Education playing a supportive role. The focus is on local leaders driving educational improvement and ensuring quality. Strategic data use is central to the implementation of this policy, with questions remaining about what data is needed, by whom, and for what purpose. This paper provides a framework for how data use for improvement is different from data use for accountability and shares lessons from the CORE Data Collaborative on how to use data for improvement in networked structures.