UNESCO, Paris

Paris, 14.-16. Juni 1989 

"Science and Technology for the Future: A fresh Look at International Co-operation"

Berlin, 25.-27. September 1990 

"Science and Technology for the Future of Europe: New Forms of Co-operation between East and West", Reichstag und Schloß Bellevue

Acapulco, 3-6. December 1990

"Science and Technology for the Future of Latin America"