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SUMMARY Studies are made of various groups of workers engaged in repetitive tasks; photographic and activity sampling techniques are used to record postural behaviour. Measurements are made of dimensions of operators and their machines and workplaces relevant to the working relationship between them. As a result of the studies modifications are made to machines and workplace layouts, and changes in postural behaviour and workers' reports of feelings of fatigue are noted.
Floyd et al. (1967) studied this question.