The ISO 9001 Supplier Audit also called In-Depth Factory Audit, Complete Supplier Evaluation or even Supplier Quality Management Assessment is a vendor qualification operation aiming to verify the compliance of your supplier quality management system face to ISO 9001 standard requirement. This audit is performed during the sourcing phase before selecting a vendor.
It aims to verify wether the quality management system of your supplier is really and properly set up according to ISO 9001 standard.
During a ISO 9001 Supplier Audit the auditor will visit the premises of your supplier and will assess its capability to comply with the ISO 9001 quality standard on a manufacturing point of view. He will especially follow and analyze your vendor capability to implement the quality management principle of ISO 9001 standard for manufacturing process.

This especially include the following:

Production scope: Supplier has established some target, KPI and threshold for its production, etc.
Control of records: Capability to control its activities by implementing document included in organizational system
Quality policy: Existence of an internal quality assurance system supervised by specialized personnel.
Internal communication: Regular coordination of personnel from all departments regarding progress as a whole.
Management Review: Assessment of management’s role in implementing and maintaining the required quality policy.
Human resource management: Competence, training, and awareness of human resource issues.
Work environment: Maintenance of a safe, sanitary and efficient production facility.
Purchasing: Maintenance of an organized network of reliable raw material and component suppliers.
Control of nonconforming product: Isolation and disposal of units that do not conform to the client’s specifications.