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\textbf{Assistive technology} (AT) is defined as "products, equipment, and systems that enhance learning, working, and daily living for persons with disabilities."  \textbf{Accessible design} is considered to be "a design process in which the needs of people with disabilities are specifically considered". Accessibility sometimes refers to the characteristic that products, services, and facilities can be independently used by people with a variety of disabilities.   \subsection{History/Background}  Define AT