In the academic world, Universal Design is more commonly known as Universal Design of Instruction, UDI; in the K-12 world it is most ofter referred to as Universal Design for Learning. This could belong with the 21st Century Learning information but I felt that UD needed its own page because it has not become a catch phrase like 21st Cent. Learning and I think that it is a vital piece of 21st Century Learning. Several sections of the educational sector have implemented UD principles; therefore there are many educational UD guidelines.
UDI Factsheet from University of Connecticut, Storrs
Scott, S.S., McGuire, J.M., & Embry, P. (2002). Universal design for instruction fact sheet. Storrs : University of Connecticut , Center on Postsecondary Education and Disability. (in PDF format)
Universal Design of Instruction (UDI): Definition, Principles, Guidelines, and Examples from the University of Washington