Early childhood data are a key component in developing robust P-20W data systems. This webinar focused on how states can design early childhood data systems that a) address key issues, on the local, state, and national levels; b) are improvement-driven as opposed to compliance-driven; and c) can be coordinated with K-12 and other key program data. Elizabeth Laird spoke about the work of the Early Childhood Data Collaborative (ECDC), and Elliot Regenstein of EducationCounsel LLC and the Illinois Early Learning Council reviewed the process of developing early childhood (EC) data systems in three states. The information presented in this webinar can help to guide states as they develop early childhood data systems--systems that will then be integrated with K-12, postsecondary, and workforce data. (author abstract)