This article begins by revealing what U.S. secondary school educators think about the Common Core State Standards when they were asked about it at a district professional development session in October 2012. The replies of these educators to the query include "It requires higher-order thinking," "The Common Core starts in 2015," "It has nothing to do with social studies and science," and "We just have to tweak our content a little." The article also discusses how principals can build ownership and support for the Common Core among staff members. A figure lists the instructional and assessment shifts in the Common Core. The article emphasizes that the shifts in teaching and learning that must occur to meet the Common Core State Standards reach far beyond English and mathematics. It states that building ownership for the implementation of the Common Core in every subject takes leadership. Exploring primary source assessments can reveal possible gaps between current practices and upcoming expectations.