The series of biennial MOLEC meetings started in 1976, when the first conference was held in Trento. Since that time the conference was held in Brandbjerg Hojskole (Denmark), Oxford (UK), Nijmegen (The Netherlands), Jerusalem (Israel), Aussois (France), Assisi (Italy), Bernkastel-Kues (Germany), Prague (Czech Republic), Salamanca (Spain), Nyborg Strand (Denmark), Bristol (UK), Jerusalem (Israel), Istanbul (Turkey), Nunspeet (The Netherlands), Trento (Italy), St. Petersburg (Russia), Curia (Portugal), Oxford (UK), Gothenburg (Sweden), and now in Toledo (Spain).

European Conference on the Dynamics of Molecular Systems focuses on the different aspects of atomic and molecular interactions, with emphasis on both experimental and theoretical studies of the dynamics of elastic, inelastic and reactive encounters between atoms, molecules, ions, clusters and surfaces.

The present edition of MOLEC is the XXI one, and this year is the 40th anniversary of MOLEC.