Universal design aims to make buildings and environments accessible to people of all abilities. It originated in the 1970s to accommodate an aging population and people with disabilities. The principles of universal design emphasize equitable use, flexibility, perceptible information, tolerance for error, and low physical effort. Universal design for learning applies these principles to education to help marginalized students, such as those with disabilities or limited English proficiency, reach their full potential. The three principles of UDL are providing multiple means of representation, action and expression, and engagement.