Universal Design for Learning (UDL) Guidelines
http://www.cast.org/publications/UDLguidelines/version1.html

CAST
2008

Abstract:

Universal Design for Learning (UDL) is an approach that addresses and redresses the primary barrier to making expert learners of all students: inflexible, one-size-fits-all curricula that raise unintentional barriers to learning. Learners with disabilities are most vulnerable to such barriers, but many students without disabilities also find that curricula are poorly designed to meet their learning needs.