Transforming data systems so that they are improvement driven, coordinated and longitudinal lays the groundwork for coordinated state ECE data systems. The 10 ECE Fundamentals outlined here provide the foundation for answering the critical questions that policymakers seek to answer. Of the four domains of services and supports that are fundamental to early child growth and development--health, early intervention programs, family supports and services, and ECE--this framework focuses on the ECE domain. (author abstract)