The Common Core comes with new instructional requirements, administrators said in a survey.

A new report from the Center on Education Policy (CEP) finds that states are actively working to implement the Common Core State Standards through planning, professional development, and technical assistance, although many adopting states said they are struggling to find enough resources and manpower to implement the new standards effectively.

The report surveyed 40 states, of which all are adopting the Common Core State Standards English/language arts standards, and 39 of the responding states are adopting the math standards. All surveyed states said they agreed that implementing the Common Core State Standards will improve student achievement because the standards are more rigorous than their previous standards.

“It is pretty clear that most state leaders believe the Common Core represents a significant shift toward more rigorous academic standards in math and English language arts and that students will benefit from that increased rigor,” said CEP Executive Director Maria Ferguson. “It is equally clear that states are facing significant challenges in preparing and supporting teachers and school leaders as they implement the standards across grades.”

(Next page: What the results say about Common Core implementation)