Principles of universal design
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The design can be used efficiently and comfortably and with minimum fatigue.
6a. Allow user to maintain a neutral body position.
6b. Use reasonable operating forces.
6c. Minimize repetitive actions.
6d. Minimize sustained physical effort.
Copyright © 1997 NC State University, The Center for Universal Design. The Principles of Universal Design, Version 2.0. Raleigh, NC:...