The NATO Advanced Study Institute on Physios of St ong Fields was held at Maratea/Italy from 1-14 June, 1986. The school was devoted to the advances, theoretical and experimental, in physics of strong fields made during the past five years. The topic of the first week was almost exclusively quantum electrodynamics, with dis- cussions of symmetry breaking in the ground state, of the physics of strong fields in heavy ion collisions and of precision...