Question:What type of audit is conducted when a customer audits suppliers to make purchasing decisions?

ASecond-party auditis conducted by customers on their suppliers to verify whether the supplier's processes or products meet the purchasing requirements.

ISO 19011:2018 Clause 3.11defines second-party audits as:“Audits conducted by a customer on their suppliers or by organizations on others with whom they have a contractual interest.”

This is referenced by ISO/IEC 42001:2023 when explaining supply chain risk management in AI systems (Clause 8.1).