Researchers and professionals in the appropriate subject areas will find this book an essential update on where research has got to in what is, after all, a hugely important area. It constitutes the refereed proceedings of the 7th International Workshop on Systems, Architectures, Modeling, and Simulation, held in Samos, Greece, in July 2007. The 44 revised full papers presented together with 2 keynote talks were thoroughly reviewed and selected from 116 submissions