This document discusses using data-driven decision making to improve early childhood language and literacy instruction and student outcomes. It presents a conceptual framework with four questions: (1) why collect data? (2) what data to collect? (3) how to collect data? and (4) how to use data for decisions. Early language and literacy proficiency is important for later school success, so data can help identify needs, monitor progress, and guide curriculum and policy changes to better support students.