Policymakers have long sought to raise expectations for students through standards-based reform. I examine the extent to which the Common Core State Content Standards (CC) affected student achievement and the size of achievement gaps. I merge together data on preparation for and implementation of the CC with the National Assessment of Educational…

Five years into the Common Core initiative, researchers and the general public are interested to know whether and how the standards are "working." In this introduction to the special topic, I discuss the state of the literature on these questions and offer suggestions for what I view as the most important work moving forward.