Thirteen years – almost to the day – after formulating its Basic Principles of the International Socialist Division of Labour, at a ‘Summit’ of Communist Party First Secretaries (in Moscow in June 1962), Comecon established its Agreed Plan for Multilateral Integration Measures, at a meeting of Heads of Government in Budapest in June 1975. The causes of delay to economic integration within Eastern Europe's trading bloc have been political, but the foundation of the body in 1949 was as political in origin as was the renewed impetus given to economic collaboration by the invasion of Czechoslovakia in 1968. Indeed, as a brief retrospective readily shows, international politics have been instrumental in every turning-point in Comecon's life of 27 years (one fewer than its nearest Western counterpart the O.E.E.C, since 1961 the O.E.C.D.).