Certification validity period; It is valid for one year based on the first audit date in the certification process. Surveillance audits are conducted annually and a new document is issued to the company every year. The company is contacted 2 (two) months before the expiration of the document validity period and a new audit is planned. The certification contract is renewed every 3 years. If there is a change in scope or address, the contract is renewed and signed without changing the contract expiration date, taking into account the first document date.