The purpose of this thesis is to design and develop an information system for supporting in due date assignment for auto body repair and paint service. It will help to estimate more accurate due date given to customers at their arrival time. Moreover, operation management will be more efficient and effective that can lead to customer satisfaction. Know-how of auto body repair and paint processes is the most necessary to be firstly considered. The policy of due date is then formulated consisting of due date assignment rule and sequencing rule. These rules are used for estimating due date and standardizing job order in processes. The outcome from this thesis is web-based information system which includes due date assignment policy, data processing modules and monitoring and controlling platform. Major advantages gained from due date assignment system include more accurate due date given to customers, standard due date management policy, better operation management, and the ability to monitor and control jobs within processes. For system evaluation, it is found that due date assignment system helps reducing the number of tardy job by providing more accurate due date. The ability to on-time delivery considerably increases. More efficient tracking and controlling jobs within processes help reducing impacts from unexpected problems affecting promised due date. The problems will be instantly notified to customers. It definitely leads to better service reliability and customer satisfaction.

Thesis (M.Eng.)--Chulalongkorn University, 2014