Many plans and initiatives, little progress.
The 1950s saw plans for both a Nordic free-trade area and a Nordic customs union, but Sweden, Norway and Denmark opted to join EFTA in 1960 instead.
Finland became an associate member of EFTA in 1961, and Iceland joined in 1970. For a brief period, all of the Nordic countries were part of the same free-trade area.
However, co-operation in the EEC was closer and more binding than that in EFTA. In July 1961, the United Kingdom applied for EEC membership, followed by Denmark and Norway.
The application process for all three countries stalled due to President de Gaulle's opposition to British membership. Negotiations ground to a halt in January 1963.
In fact, the problems within the EEC made a permanent treaty on Nordic co-operation seem more desirable. The treaty was finally ratified in Helsinki on 23 March 1962, which is why the Nordic “constitution” is known as the Helsinki Treaty.
From 1968 until early 1970, intense negotiations on Nordic economic co-operation within a framework dubbed “Nordek” foundered when Finland stated it could not take part because of its relationship with the Soviet Union.
However, this setback led to another initiative, and the Nordic Council of Ministers was established in 1971.