To participate in the EU's single market, Iceland, Liechtenstein and Norway are party to the Agreement on a European Economic Area (EEA), while Switzerland has a set of bilateral agreements with the EU.
To participate in the EU's single market, Iceland, Liechtenstein and Norway are party to the Agreement on a European Economic Area (EEA), with compliance regulated by the EFTA Surveillance Authority and the EFTA Court. Switzerland instead has a set of bilateral agreements with the EU.