64 страниц. 2012 год. LAP Lambert Academic Publishing The increasing trend of work absenteeism and early exit from work life may be as a result of ill health or disability, due to strain and pain at work. This calls for a need to describe perceived strain and pain, and how they relate with perceived work ability, especially on a normal work day. This is essential because jobs need to be designed within the constraints of ergonomic principles so as to meet workers' abilities, perception and limitations.