The Universal Design for Learning (UDL) framework for curricular design is research-based, relying headily on cognitive neuroscience. The focus of UDL is the development of learning environments that, through flexibility, accommodate individual learning differences. First articulated by David H. Rose, Ed.D. of the Harvard Graduate School of Education and the Center for Applied Special Technology(CAST) in the 1990s, the principles of UDL have the potential to guide instructional practices toward the creation of the optimum teaching and learning environment.