Abstract:
The objective of this research was to reduce the downtime in automotive production line to an acceptable level of less than 100 hours per the production of 400 cars per month by using a framework of 8 steps of risk management and internal control (Enterprise Risk Management) of the COSO. According to the study, it was found that there were 91 situations causing the downtime in car production. After the situations had been evaluated with consideration on the likelihood and consequence, it was found that 16 situations were selected to be solved by analyzing the causes with the use of Why-Why Analysis. Fifty control plans were established with 3 expensed plans (243,000 baht) and 47 non- expensed plans. After operational risk treatments were implemented, the downtime in car production line could be reduced to the target under stability of control of the operation. The reduction was from 162.4 hours per the production of 400 cars per month to 63.94 hours per the production of 400 cars per month or 60.63%. The value of loss from opportunity cost was reduced from the average of 92.69 million baht per month to 14.01million baht per month or 84.88% .The value of loss from overtime cost was reduced from the average of 3.4 million baht per month to 1.54 baht per month or 54.70%.