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Industrial design studies function and form—and the connection between product, user, and environment. Generally, industrial design professionals work in small scale design, rather than overall design of complex systems such as buildings or ships. Industrial designers don't usually design motors, electrical circuits, or gearing that make machines move, but they may affect technical aspects through usability design and form relationships. Usually, they work with other professionals such as engineers who focus on the mechanical and other functional aspects of the product, assuring functionality and manufacturability, and with marketers to identify and fulfill customer needs and expectations.