QA is quality assurance.
QC is quality control.
The work of QC is mainly the inspection of finished products, raw and auxiliary materials, etc. QA is the quality assurance for the whole company, including the release of finished products, raw and auxiliary materials and the normal operation of the quality management system.
QC mainly refers to inspection, which first appeared in the history of quality management, and delivery after inspection is the most basic requirement of quality management.
With the emergence of QA, the scope of enterprise quality management has been further expanded, including the whole scope of quality assurance inscriptions, and the authority of quality managers has been further increased. The QA of some enterprises also includes CS (Customer Satisfaction) business, that is, dealing with customer complaints: analysis, countermeasures, customer satisfaction survey and other businesses.
The main functions of QC are management and control in production and processing, statistics and analysis of process data, and providing relevant information to other departments.
The main function of QA is to establish and improve the quality system, ensure the quality of finished products and track the market situation.
QA focuses on the establishment and maintenance of quality management system, quality system audit of customers and certification bodies, quality training, etc. QC mainly focuses on quality inspection and control.
The work of QA involves the overall situation of the company and all related functions, covering a wide range, while QC mainly focuses on product quality inspection, which is only one aspect of quality work.