This Framework is built upon the foundation of the 2003 and 1997 "Massachusetts History and Social Science Curriculum Frameworks." Based in research on effective practice, it represents the contributions of members of the History and Social Science Curriculum Framework Review Panel, scholars who served as Content Advisors, and the more…

Background: Cluster-randomized experiments that assign intact groups such as schools or school districts to treatment conditions are increasingly common in educational research. Such experiments are inherently multilevel designs whose sensitivity (statistical power and precision of estimates) depends on the variance decomposition across levels.…