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IEA Definitions of Ergonomics
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Ergonomists (ergonomics practitioners) contribute to the design of tasks, jobs, products and environments to make them compatible with the needs, abilities and limitations of people.

Ergonomics is a systems-oriented discipline and practising ergonomists must have a broad understanding of its full scope. That is, ergonomics espouses a holistic approach in which considerations of physical, cognitive, social, organizational, environmental and other relevant factors are taken into account.