The Higher Education Opportunity Act (HEOA) is the first federal legislation to define and endorse UDL. 

UDL is defined as follows:

Universal Design for Learning (UDL) means a scientifically valid framework for guiding educational practice that —

(A) provides flexibility in the ways information is presented, in the ways students respond or demonstrate knowledge and skills, and in the ways students are engaged; and 

(B) reduces barriers in instruction, provides appropriate accommodations, supports, and challenges, and maintains high achievement expectations for all students, including students with disabilities and students who are limited English proficient.

Higher Education Opportunity Act of 2008

The UDL Guidelines are not a rigid set of regulations but rather a collection of suggestions that can help minimize obstacles and maximize learning opportunities for all learners. These guidelines can be tailored to suit specific learning objectives, subject areas, and circumstances. Even if educators are already implementing some aspects of the guidelines in their teaching, they may still encounter obstacles in achieving their learning objectives. However, by utilizing the guidelines as a tool, educators can establish a common language and develop objectives, assessments, and materials that provide accessible, meaningful, and challenging learning experiences for all.