The book describes the achievements of the DREAMS project. The aim of this European project is to achieve security, safety, real-time performance in systems, in which different safety requirements are demanded (e.g., airplanes, hospital equipment). The book introduces the basic terms and concepts of mixed-criticality and real-time embedded systems. The core part of the book is to present different technologies that are demanded to realize such systems and at the end, it is shown, how the introduced technologies can come into handy in three different application domains (avionics, wind-power and health-care)