Outer regions of the Milky Way.- Resolved stellar populations as tracers of outskirts.- Star formation in the outskirts of galaxies.- Disk fading and regrowth in early-type galaxies.- Imaging haloes and disks.- Outer regions of elliptical galaxies.- ISM in outskirts (HI, CO, etc).- Observing and modelling metallicities.- The outer regions seen at high redshifts.- Evolution of outer structure.- Constraints from numerical modelling.-Accretion: Theory and modelling.- Future prospects: Deep imaging of galaxy outskirts using telescopes large and small.