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In recent years, more and more variety of products are produced also in manual assembly lines like white goods as customer needs become diversified. In response to this, there is a transition in the bases from a traditional mass production line to multiple small production lines for each kind of product. In the small production lines, the process tasks become more complicated than in the mass production lines because a lot of element tasks are involved with a process. As the result, there are some cases where the productivity deteriorates because the tasks which used to be completed in the mass production lines cannot be completed in time. One of the causes is assumed to be occurrence of a bewilderment phenomenon, the phenomenon where movements of human being are frozen or delayed by the freeze or blunting of thought when they handle a lot of tasks. This study, focusing on the bewilderment phenomenon, clarified the types of bewilderment phenomenon which may occur during manual assembly tasks. Then, the relationships between complexity of tasks and occurrence of bewilderment phenomenon were analyzed. Then, it was confirmed that the bewilderment phenomenon cause prolonged operation time and learning periods.

AN ANALYSIS ON INFLUENCE OF BEWILDERMENT PHENOMENON ON OPERATION TIME AND LEARNING PERIOD IN MULTI ASSEMBLY PROCESS