UDL stands for Universal Design for Learning. Visit the National Center for Universal Design for Learning. Universal is not uniform but encompasses enough variation in instruction to reach diverse learners. UDL harnesses the power of individual differences in experience, interest, engagement, perception, processing, responses and expression. UDL adjusts support for optimal engagement and learning. UDL means you don't have to "dumb down the curriculum" because UDL meets the students' needs with just-in-time help, text aloud, vocabulary support, ESL support, and multiple representations covering all of the learning pathways. UDL is defined in the US Higher Education Opportunity Act of 2008, Sec. 103 (24).
AIM stands for Accessible Instructional Materials.
Since 2006, the American Association of Publishers has created XML digital source files of their textbooks. These NIMAS (National Instructional Materials Accessibility Standards) versions of text books address the national need to increase the availability and timely delivery of print instructional materials in accessible formats to students with visual, print and learning disabilities.
CAST (cast.org) exists to transform education through Universal Design for Learning. UDL is a framework for designing curricula that enable all individuals to gain knowledge, skills, and enthusiasm for learning. UDL provides rich supports for learning and reduces barriers to the curriculum while maintaining high achievement standards for all.
FREE CAST TOOLS for teachers, students and parents: A web-based writing tool that supports all students in the science report-writing process. Learn More

| Free | CAST
Enables educators to develop their own digital books to support reading instruction literacy learning. Learn More Grades: All Grades |
 Free | CAST
Helps educators build options and flexibility into each element of the curriculum in order to reach and engage all students. Learn More Grades: All Grades |
 Free | CAST
Publicized by Google around the world, UDL Editions is a model for presenting classic texts from world literature in a flexible online interface with just-in-time, individualized supports for struggling and expert readers alike. Learn More Grades: 5 and up |
 Free | CAST
A set of principles for designing curriculum that provides all individuals with equal opportunities to learn. Created at CAST and housed by the National Center on Universal Design for Learning. Learn More about the National Center on UDL Grades: Educators |
 Free | CAST
Helps educators to design lessons/units of study to meet the diverse learning challenges, skills, and background of students in today's classrooms. Learn More Grades: All Grades |
| Free | CAST
Two online modules that introduce the theory, principles, and application of Universal Design for Learning (UDL) to teacher candidates and in-service teachers. Learn More Grades: Educators |
 Free | CAST
Publicized by Google around the world, Strategy Tutor supports students and teachers doing reading and research on the Internet. Learn More Grades: 5 and up |
 Free | CAST
Explains and exemplifies Universal Design for Learning and its classroom applications. Also provides activities, model lessons, and toolkits to support educators. Learn More Grades: All Grades |
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