With the voluntary Common Core State Standards (CCSS), states have sought to establish clear, high expectations that are consistent across participating states and that signal what K-12 students should learn in mathematics and English language arts (ELA) to be prepared for college and careers. As of July 2013, the CCSS have been adopted by 45 states and the District of Columbia in both subjects and by one additional state in ELA only. To learn more about states' policies, progress, and challenges in assessing students' mastery of the CCSS and preparing to implement assessments aligned to these standards, the Center on Education Policy (CEP) at The George Washington University included several specific questions about assessment within a broader state survey on Common Core implementation. The survey was administered to state deputy superintendents of education or their designees from February through May of 2013. Forty states responded, including 39 that had adopted the CCSS in both ELA and math and 1 that had adopted the standards in ELA only. Thus, the survey findings represent the views of a majority of the adopting states at the time of the survey. The responses of specific states have been kept confidential to encourage frank answers. This report describes states' responses to questions from the survey about assessments aligned to the Common Core. A section on study methods is appended. [This report was written with the assistance of Nancy Kober.]