Viscoelastic Interfaces Driven in Disordered MediaThis book offers an in depth study of two well known models of avalanche dynamics, modified minimally by the inclusion of relaxation. Many complex systems respond to continuous inputs of energy by accumulation of stress over time, interrupted by sudden energy releases called avalanches. The first model studied is the viscoelastic interface driven over disorder, which is shown to display the fundamental features of friction. In the mean field limit,