A: Standardized management stage: develop product testing documents and make quality statistics.

B: Total quality management stage: quality management with full participation.

C: ISO management system establishment, implementation stage: ISO9001:2015, ISO14001:2015

D: Establishment and implementation of IATF16949:2016 quality management system.

E: SPC management application: use statistical management methods to improve the quality management level of the enterprise.