In the period from July 8 to July 13, 1990, in Montreal, the 33rd IUPAC International Symposium on Macromolecules was held. More than 2000 participants from 45 countries took part in the conference. Honorary chairman of this symposium was Professor Herman F. Mark (Brooklyn Polytechnic University, New York) and president of the Organizing Committee was Prof. Robert E. Prud'homme (Universite Laval, Quebec City, Canada). The symposium included 7 plenary lectures, 4 divisions, and an exhibition.