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In this paper a new high-level system design approach for electronic systems is presented. It supports object-oriented system modeling of software intensive components with the Unified Modeling Language and time-discrete and time-continuous modeling concepts. Our approach supports structural and behavioral modeling with front-end tools and simulation/emulation with back-end tools. The XMI (XML Metadata Exchange) format and the UML metamodel is used for an exchange and storage of CASE data. The CASE tool chain, which we present in this paper, supports concurrent engineering with versioning and configuration management and provides tool adaptors for MATLAB/Simulink and ARTiSAN Real-Time Studio. Using the Unified Modeling Language notation for an overall system design cycle, the focus of this paper lies on the subsystem coupling of different modeling domains and a new code generation approach.