The mandate to make curricula accessible to all learners has been embedded into recent educational legislation that defines and endorses the Universal Design for Learning (UDL) principles. The Every Student Succeeds Act (ESSA) and the 2016 National Education Technology Plan build on the work of The Center for Applied Special Technology (CAST). UDL was first defined in the Higher Education Opportunity Act of 2008 (HEOA) as follows:
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