One hundred and thirty-eight female college undergraduates have been investigated to ascertain whether there is some underlying difference between those who choose to work on early and late schedules. The subjects in the ‘early’, ‘midday’ and ‘late’ schedules were tested for academic motivation and scholastic aptitude. The results show no significant differences between the groups. The effect of our daily physiological ups and downs on work performance is obviously an important issue to industry and educational institutions. If on-the-job performance is found to fluctuate between morning and evening hours, the present study rules out attributing this to ability or motivation differences. Hence any such fluctuations should be attributed to circadian temperature variations.

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