Math in Common® (MiC) is a five-year initiative that supports a formal network of 10 California school districts as they implement the Common Core State Standards in Mathematics (CCSS-M) across grades K-8. In spring 2015, WestEd administered surveys to understand the perspectives on Common Core State Standards-Mathematics (CCSS-M) implementation of teachers and administrators in eight California school districts participating in the Math in Common (MiC) initiative. Over 1,000 respondents replied to the survey, about some of the initial successes and challenges facing California educators attempting to put in place and support new--and what some consider revolutionary--ideas in U.S. mathematics education. The following are appended: (1) Research Methodology and Survey Sample, and (2) Sample Survey Item and Sub-Items.