Abstract: Structure theory and resource theory were used to explain the performance of multiple task. Cognitive ability played a major role in multiple tasks in form of the rate of information processing and the capacity of storing and manipulating information. The purpose of this study was to find out the relationship between the rate of information processing and the performance of mufti-task as task rate changes and task number increases. We hypothesized that resource included the clock of brain process, working memory and set of process instructions. The mechanism of clock distribution is multichannel time-sharing . The results showed that as the speed of task signals increased, the performance became worse under the condition of certai work load. The implications of the present study were discussed.

Key words: performance, resource, process clock, multichannel, time-sharing