Konkretni aranžmani i rezervne mjere u sprovedbi slobode kretanja naznačeni su u Šengenskoj konvenciji, koju je tih pet zemalja potpisalo 1990, a koja je stupila na snagu nakon nekih pet godina.
The specific arrangements and safeguards for implementing freedom of movement were spelled out in the Schengen Convention signed by the five countries in 1990, entering into force about five years later.