The group "Physics of defects and plasticity" includes 13 researchers, with a strong expertise in the study of defects in materials using theoretical and experimental methods, and with national and international collaborations. 3 researchers are theoreticians, all active in performing various kinds of numerical simulations (DFT, ab initio and classical molecular dynamics) with different standard tools, and are strongly involved in the project. Calculations are performed using local PC clusters, as well as with access to National Computing Centers. There is also a large experimental component in the group, with expertise in the structural and electrical characterization of defects (DLTS, TEM, RX,...), working in close collaboration with theoreticians.