Ergonomics

The keyboard and mouse should be about 3-4 inches lower than a writing desk so shoulders are relaxed, not hunched or slouched.

Cornell University Ergonomics Web (http://ergo.human.cornell.edu/)
Information from research studies and class work by students and faculty in the Cornell Human Factors and Ergonomics Research Group (CHFERG). CHFERG focuses on ways to enhance usability by improving the ergonomic design of hardware, software, and workplaces, to enhance people's comfort, performance and health in an approach we call Ergotecture. We recognize that this is also as an important component of the Department's Ecotecture sustainable design approach.

Canadian Centre for Occupational Health and Safety (http://www.ccohs.ca/oshanswers/ergonomics/)
Ergonomics is matching the job to the worker and product to the user. Ergonomics and human factors are often used interchangeably in workplaces. Both describe the interaction between the worker and the job demands. The difference between them is ergonomics focuses on how work affects workers, and human factors emphasizes designs that reduce the potential for human error.

Human Factors and Ergonomics Society (http://www.hfes.org)
The Society's mission is to promote the discovery and exchange of knowledge concerning the characteristics of human beings that are applicable to the design of systems and devices of all kinds.

The Society furthers serious consideration of knowledge about the assignment of appropriate functions for humans and machines, whether people serve as operators, maintainers, or users in the system. And, it advocates systematic use of such knowledge to achieve compatibility in the design of interactive systems of people, machines, and environments to ensure their effectiveness, safety, and ease of performance.