COSIRES 2008 is the 9th in a series of international conferences on Computer Simulation of Radiation Effects in Solids, the first of which was held in Berlin (Germany) in 1992. This conference, which is held every two years, is the foremost international forum to address the theory, development and application of advanced computer simulation methodologies to the understanding and modeling of the interaction of energetic particles and clusters (from several eV to many MeV) with solids.