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Product design and industrial design overlap in the fields of user interface design, information design, and interaction design. Various schools of industrial design specialize in one of these aspects, ranging from pure art colleges and design schools (product styling), to mixed programs of engineering and design, to related disciplines such as exhibit design and interior design, to schools that almost completely subordinated aesthetic design to concerns of usage and ergonomics, the so-called "functionalist" school. Except for certain functional areas of overlap between industrial design and engineering design, the former is considered an applied art while the latter is an applied science. Educational programs in the U.S. for engineering require accreditation by the Accreditation Board for Engineering and Technology (ABET) in contrast to programs for industrial design which are accredited by the National Association of Schools of Art and Design (NASAD). Of course, engineering education requires heavy training in mathematics and physical sciences, which is not typically required in industrial design education.