A useful overview of ergonomics appeared in an article reporting that Gavriel Salvendy from Purdue University has been internationally honored in the field of ergonomics by Ergonomia, an international journal.
"The field of ergonomics can be divided into three categories: physical, social and cognitive. The physical area deals with problems involving lifting, pushing and more specifically, with injuries associated with the workplace such as carpal tunnel syndrome. The social area concentrates on the design and composition of group dynamics and the interactions of people. The cognitive area focuses on designing computing systems that match human mental capabilities. These systems understand how humans perform certain tasks and emulates them through artificial intelligence."
Article source http://www.purdueexponent.com/index.php/module/Issue/action/Article/article_id/3935