The importance of immediate remedies for quality , reliability , and safety problems cannot be overstressed . Prevention of their recurrence is a 且 so very important. If their effects on a seciety or an entire organization are extremely vast , recurrence prevention is insufficient , and the key is preventing them in advance . In quality crises , human factors play important roles . For preventive measures , advance disclosure of potential human errors is very important. This paper presents two

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... ethods that reveal human errors : guide words analysis of human errors and similarity analysis of product use focused on the function of a product . The former focuses on deviations from the correct use , and the latter focuses on uses that manufacturers had not intended for their products . More than 95 percent of the errors that cause consumer product accidents were revealed in a list from a reponing