International Ergonomics Association：Ergonomics (orhuman factors) is the scientific discipline concerned with the understanding of interactions among humans and other elements of a system, and the profession that applies theory, principles, data and methods to design in order to optimize human wellbeing and overall system performance.
根据国际人因学会的定义：人因工学或人类工效学是关注人与系统中其它元素之间交互的科学领域，是一门应用理论、原则、数据和方法进行设计，从而提升人类福祉和整个系统表现的专业。