Sous son impulsion, plusieurs grands projets européens tels que le Marché Intérieur ("l'Objectif 1992"), les "paquets Delors I et II", la relance du dialogue social européen, l'Acte Unique (1986, son "traité favori ») ont vu le jour.
Mr Delors was the driving force behind many major European projects, including the Single Market (the 1992 Objective), the Delors Packages I and II, the revival of European social dialogue and the Single European Act (1986, his "favourite treaty").