ISO 9001
The most widely recognised standard is ISO 9001, a basic quality management system that can be used in industries of any size, anywhere in the world. Registration to ISO 9001 (or other quality/management standards) provides objective proof that a business has implemented an effective quality management system, and that it satisfies all of the requirements of the applicable standard. An external, impartial expert called a registrar or CB (Certification Body) conducts an on-site audit to determine whether or not a company is in conformance to the standard. If they are found to be in conformance, they will be issued a certificate showing their address, scope of operations and the seals of the accreditation bodies that give the registrar its legitimacy.
The latest revision of the ISO 9001 standard was released in September 2015.