Introduction.- Geological and structural setting and evolution.- Geophysical structure.- Architecture and evolution of the magmatic feeding system I.- Architecture and evolution of the magmatic feeding system II.- Geochemistry of distal tephra and its implications on tephra chronology.- Rheological properties of magmas and their influence on mixing processes and eruption dynamics.- Magma chamber dynamics.- Geochemistry of the hydrothermal system.- Current degassing and hydrothermal dynamics.- Current seismicity.- Ground deformation and source modelling.- Reconstruction of the last eruption from chronicles.- Slope instability in pyroclastic terrains.- Millenary human inhabitation and present urbanization.- Campi Flegrei volcanic hazards assessment.