Today's reform landscape transcends instructional leadership and data-based decision-making skills. This is not to say that those behaviors are not essential to a principal's success, but they no longer suffice. Principals do not need to be curriculum experts, but they do need to lead their schools with full knowledge of the Common Core State Standards (CCSS), the new assessments tied to those standards, and the rigor embedded in both. Principals have an integral role in leading the transition to the CCSS in their schools. To effectively transition to the CCSS-based curriculum, principals must become curriculum leaders.