Together with their members and auditors, certification bodies are an important link in the chain between QS and the businesses and companies participating in the QS scheme. In the audits, the auditors inspect and assess whether and how the client oriented requirements are implemented. During this process, they carry out a thorough inspection of all the relevant production and marketing processes and check the corresponding documentation.

Systematic monitoring of products ensures that defects and risks can be identified in a timely manner and measures implemented to resolve these problems. The laboratories recognised in the QS system play a key role in this respect within the framework of various monitoring programmes. Reliable and comparable results are assured by the requirements defined by QS concerning the performance capability of the laboratories.