— Astra DMS (dealer management system) is used by PT Kharisma Siliwangi to support operations against the after-sales service. Astra DMS is an information system that offers a wide range of technical services to meet the needs of support, service, and maintenance operations. When introducing new information technology systems, the company constantly invests in large quantities. The investment will be in vain if the employee does not receive system information presented. Therefore, the introduction and USAge guidelines Astra DMS for employees at PT Kharisma Siliwangi must show interest and behavioral tendency towards the use of actual systems in the services, after-sales. TAM found two specific beliefs (beliefs) that perceived usefulness and perceived ease of use is a major connections to the behavior of reception Computer. Therefore, the main objective of this study was to investigate and analyze the factors critical to the implementation of DMS Astra relating to the behavior of user acceptance and simultaneously to investigate the impact of the implementation of the individual performance of after-sales service Daihatsu vehicles in Kharisma Siliwangi Bandung. The results indicate that there is significant influence of the use of Astra DMS uses several variables contained in TAM to the individual performance of employees in conducting after-sales service.