The Cargese Summer Institute 1B75 on Weak and Electromagnetic Interactions at High Energies was organized by the Universite Pierre et Marie Curie (M. LEVY et J. L. BASDEVANT), the Katholieke Universiteit te Leuven (R. GASTMANS) and the Universite Catholique de Louvain (D. SPEISER et J. WEYERS) who made in 1973 the first contacts with some lecturers, who, on the advice of NATO, joined th their efforts and worked in common. It was the 16 Summer Insti- rd tute held at Cargese and the 3 one organized by the two depart- ments of Theoretical Physics at Leuven and Louvain-Ia-Neuve. When the two groups decided (independently) on the subject of the school, they could not know how lucky their choice eventually would turn out to be : rarely has it been possible ~o present an audience with such a great number of new and decisive discoveries who are likely to stimulate the imagination of theoreticians and the research projects of experimentalists alike. Such were the decisive confirmation of the neutral currents, the di-muon events, the slowly decaying new particles, etc. The organizers were grate- ful indeed that they could find physicists from almost all great centers of high energy physics who had themselves participated in these discoveries. Although the theorists could not match during the last two years the spectacular success of their experimental colleagues, there has been enough important programs, especially in field theory : renormalization of gauge theories, the Brout- Englert-Higgs mechanism, etc…