National Center On Universal Design for Learning
"Universal Design for Learning (UDL) is included in the application to students with disabilities section of the CCSS. Although this reference to UDL may give the impression that UDL is just for students with disabilities, all students can benefit from applying UDL to curriculum design and instructional practice.
The CCSS can be considered the "What" in education, i.e., the goals and expectations. It is the destination we wish our students to reach. In light of that, UDL can be considered the "How" in education, i.e., the curriculum and instructional framework teachers use to plan their lessons. In other words, UDL and the CCSS are complementary: the UDL framework provides educators with the means to maximize student attainment of the CCSS."