Before any child who was deaf and blind had been educated, philosophers had long speculated that the mind of a child who was deafblind could reveal what is basic and true about human beings. They believed that such a child deprived of sensory input and ignorant of the world would offer them insight into innate human knowledge of a higher being.
Universal Design (UD) is an approach to design that increases the potential for developing a better quality of life for a wide range of individuals. It is a design process that enables and empowers a diverse population by improving human performance, health and wellness, and social participation (Steinfeld and Maisel, 2012). It creates products, systems, and environments to be as usable as possible by as many people as possible regardless of age, ability or situation.