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This paper describes the concept of the operating system ERCOS (Embedded Real-time Control Operating System). ERCOS has been specially designed to meet the functionality and performance requirements in the area of automotive applications. The ever increasing functional requirements for modern electronic control units are introducing considerable complexity in the area of software development. It is well known that real-time operating systems provide powerful means to handle complex functions under real-time constraints. Past experience, however, has shown that the efficiency and flexibility of operating systems was very often inadequate for automotive applications. To overcome these insufficiencies the operating system ERCOS has been designed with dedicated support for automotive requirements. This has been achieved by supplementing the run-time part of the operating system by powerful off-line tools.