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This study explored time estimation for a secondary event while the subjects were attentively engaged in a primary one. It also examined whether the perception of time is hemispherically lateralized as estimated by the dichotic listening technique. A tone of 500 Hz was delivered to either ear equally often while the subject was shadowing a recorded passage also presented to either ear. At the end of the tone, the subject estimated the tone's duration. There were three levels of shadowing demands, i.e., control, slow and fast, and four tonal durations, i.e., 6, 14, 27, 63 sec. Subjects tended to underestimate more the tonal duration when the primary task, i.e., shadowing the passage, was more demanding. No clearcut indication of hemispheric lateralization of temporal duration was found.

In the design of industrial inspection tasks, the assumption is usually made that human performance data collected in a 100% inspection scheme is valid for use when the inspector is engaged in sampling inspection. A direct test of this assumption using 60 student subjects showed it to be valid. Analysis of the inspection data in terms of stopping policy in selfpaced inspection showed close correspondence with a model of systematic visual search.