kACMS ( KOSHA Accident Causation Management System) has been developed to control human errors in Korean chemical industries. kACMS is a safety management system using the Korean GFT ( general failure type) methodology, which has been found a good approach to eliminating, or at least minimizing human errors. To observe the trend of human errors in the chemical industry, about 5500 near-miss cases have been collected from a Korean chemical plant. The analysis of the collected cases shows that the removal of human errors is the key to preventing these near-miss cases that have the potential to lead to actual accidents. A Korean petrochemical company applied kACMS in its 9 chemical plants. Fifty-five employees participated in the survey and 12,000 safety data were collected based on a questionnaire. As a result of each survey, the average, best, and worst scores were 85.0, 90.6, and 79.6, respectively. These results led to a thorough investigation of the safety systems of the worst scored plant and directions for improving safety.