The ISO and its affiliated IEC are the two major global standards-making groups. They are concerned with establishing standards that promote interchange of products, agreement upon methods of evaluation and resolution of nonfunctional differences among national standards. They are structured as an international federation of the more than 50 national standards organizations. The US is represented by ANSI. The ISO and the IEC, through their many focused technical subcommittees, provide the deliberative, judicial, and administrative forums which develop consensus and give substance to the international standards effort and to the finished standards.