Abstract
Ergonomists are often asked to evaluate selected jobs because of excessive back injury rates. One key step in the evaluation process is identification of specific tasks that impose the largest stresses on the backs of workers who perform the job. Four techniques for identifying the most back-stressing tasks were used in an ergonomic study of nursing assistants working in a nursing home. Two techniques were based on worker perceptions and two were based on a static biomechanical model. The rank order of tasks was similar for each technique. It was concluded that when the purpose is to identify which of several tasks should be evaluated in greater detail, the most programmatic technique is a rating scale.
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