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ANSI/ISO TC135 Technical Advisory Group (TAG)

The International Organization for Standardization (ISO) is a worldwide federation of national standards bodies from more than 145 countries, one from each country. ISO is a non-governmental organization established in 1947 and based in Geneva, Switzerland. Its mission is to promote the development of standardization and related activities in the world with a view to facilitating the international exchange of goods and services, and to developing cooperation in the spheres of intellectual, scientific, technological and economic activity. ISO's work results in international agreements which are published as International Standards and other types of ISO documents. The American National Standards Institute (ANSI) is a member of the worldwide federation of National Standards Bodies. ANSI is the sole member for the USA.

ISO standards are developed through technical committees comprising of experts from the industrial, technical and business sectors. These experts may be joined by others with relevant knowledge, such as representatives of government agencies, testing laboratories, consumer associations, environmentalists, academic circles and so on. The experts participate as national delegations, chosen by the ISO national member institute for the country concerned. These delegations are required to represent not just the views of the organizations in which their participating experts work, but of other stakeholders too. For NDT ISO standards, the technical committee responsible is the ISO TC135 group.

Each country will provide representation for the TC135 Group. For the US, ASNT under the authority of ANSI represents the US voice as it relates to the ISO NDT Standards and ISO TC135. Within the US, we are known as the ANSI/ISO TC135 TAG (Technical Advisory Group). The key functions and responsibilities for any TAG is as follows:

  • Determine the U.S. position on an ISO draft International Standard, draft technical report, committee drafts, ISO questionnaires, draft reports of meetings, etc.
  • Provide adequate U.S. representation to ISO committee meetings, designate heads of delegation and members of delegations, and ensure compliance with the ANSI Guide for U.S. Delegates to IEC/ISO Meetings (including preparation and submission of a Head of Delegation report by the designated Head of Delegation).
  • Determine U.S. positions on agenda items of ISO committee meetings and advise the U.S. delegation of any flexibility it may have on these positions.
  • Nominate U.S. technical experts to serve on ISO Working Groups.

Further information may be found on

Documentation Associated With the ANSI/ISO TC135 TAG

ANSI/ISO TC135 TAG – Meeting information

Contact with questions:
Michelle Thomas