The cooperative simulation environment MoSAIC (Modular and Scalable Application Platform for ITS Components) is a modular and scalable architecture for multi-driver simulation. It allows the Institute's existing simulators to be linked together and operated from a central control position. MoSAIC is used for designing, developing and evaluating cooperative and standard driver assistance systems. The MoSAIC lab, a laboratory infrastructure specifically designed for multi-driver scenarios with three interlinked driving-fit seat simulators, can be used in particular to test cooperative assistance functions in a simulated environment before real-world testing. MoSAIC also enables us to link several of the Institute's laboratories.