Preface (R.A. Broglia and J.R. Schrieffer). 50 years of the Mott phenomenon: insulators, magnets, solids and superconductors as aspects of strong-repulsion theory (P.W. Anderson). Collective motion in Fermi droplets (G. Bertsch). The quantum Hall effect (R. Schrieffer and D.P. Arovas). Quantum effects in heavy-ion reactions (D.M. Brink). Heavy fermions (T.M. Rice). Theory of relaxation, phase transitions and tunnelling in nuclei (R.A. Broglia). The quantum mechanics of a macroscopic variable: some recent results and current issues (A.J. Leggett). Moments at the relativistic borderline: nuclei and rotation superconductors (G. Baym). Numerical simulations of many-electron condensed-matter systems (D.J. Scalapino). The lattice strong interactions: an introduction (E. Marinari).