The American Teacher Panel (ATP) and the American School Leader Panel (ASLP) are resources that researchers, policymakers, and professional organizations can use to monitor over time the attitudes and behaviors of US teachers and school leaders in response to large-scale policy changes. One national policy change of growing importance is the implementation of the Common Core State Standards (CCSS). The standards, developed over a period of years by the National Governors' Association, the Council of Chief State School Officers, and other organizations, set rigorous expectations for what students should know and be able to do in English language arts (ELA) and mathematics. As of 2014, over 40 states had adopted the CCSS or variations of them. Yet, the standards have become the subject of much political controversy, and a few states are considering rescinding their adoption or have done so already. Given the heightened rhetoric surrounding the standards, it is useful to know what teacher and principals think about them and how they are being implemented. This document presents illustrative findings from a field test of the panels, conducted in May 2014, focusing on perceptions and practices related to the CCSS.