This meeting was devoted to review the physics potential of the LEP accelerator at CERN. A detailed representation of the experimental techniques and most relevant physics issues was given.

This volume is devoted to HERA physics (HERA is the electron-proton collider at DESY, Hamburg). The lectures cover the main areas of current research in the field of deep inelastic scattering at high energies, at both the theoretical and the experimental level. Particularly interesting are the presentations on data from both HERA experiments, namely H1 and ZEUS.