The purpose of this study is to examine how human errors which cause labor accidents occur and
how they can be reduced to a minimum. In this study, two labor accidents caused by human errors were
dealt with as case studies, in which we conducted semi-structured interviews with sixteen employees of a
manufacturing company including victims, coworkers, maintenance workers, supervisors and managers.
This study clearly states problems of the organization: maintenance delay of unstable facilities,
managers’ ignorance of employees’ requests, attachment of importance to productivity, difficulty of
evaluation of safety activities, and management of production line in a haphazard way. The result
indicates what top executives, managers and supervisors should do to prevent human errors.
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