Vendor Inspection is the inspection and validation of new equipment. Vendor inspection of equipment can take place throughout the supply chain - during the manufacturing process, prior to the equipment leaving manufacturing site as well as during transportation and on-site arrival.

A Factory Acceptance Test (FAT) follows the qualification stage of the design qualification (DQ) and it includes a series of testing done on equipment, carried out at the system manufacturer’s site in order to verify that the vendor has accomplished responsibilities and regulatory and client user requirements.