Scientific manufacturing specification control through every aspect of the production process is a major part of TDC’s quality control system.The issuance and recovery of product specifications: the Document Control Center of the Quality Department is responsible for issuing valid documents and retrieving obsolete ones. Execution of product specification: Professional production plants manufacture and process products strictly according to the blueprint. The verification of specification execution: the Quality Department inspects the production process and product quality strictly accordance to accurate drawing specifications. The supervision of specification discipline: the Quality Department does real time monitoring for the spec discipline state of each production plant. The R&D Department will have random checks of the accuracy of drawing specifications monthly.