Universal design evolved from accessible design. By designing your course with the diverse needs of your students in mind from the start, is more accessible to everyone whether it's a door knob or a course curriculum. UDL says the average student is a myth, and uses the following principles to maximize their access to learning.
Also available for download are a full text format of the guidelines and an educator's worksheet for note-taking. Both are available in Word format on UDL Guidelines page. The guidelines are also available in a number of languages.