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In this paper a model based design approach is described helping to improve the process of automotive embedded software development. The methodology contains a prototypical development process which shows great improvement towards the more and more upcoming non-functional demands faced by automotive software development like reusability, scalability and resource efficiency. This is achieved by use of increased formalism, continuousness and open standards. The whole hereby proposed and surrounding development process is introduced including all essential artifacts, process steps and formal or automated transitions between them. Significantly important is the Abstract Automotive Software Architecture (ABSOFA), a meta model based software architecture modeling concept for structuring automotive software fully abstracting from realization, implementation and platform details. The meta model as well as the modeling language itself are based on the Unified Modeling Language (UML).