National Groups are the principal working groups within the IDDRG. National Groups are created by member countries and also some member countries working in close cooperation can create regional groups, like

• the North-American Deep-drawing Research Group (NADDRG) including
  
• the USA and
• Canada

• the Scandinavian Deep-drawing Research Group including
• Sweden,
• Finland and
• Norway

• the Benelux Deep-drawing Research Group (BDDRG) including
  
• Belgium
• The Netherlands and
• Luxembourg