The amount of software in cars grows exponentially. Driving forces of this development are cheaper and more powerful hardware and the demand for innovations by new functions. The rapid increase of software and software based functionality brings various challenges (see [21], [23], [25], [26]) for the automotive industries, for their organization, key competencies, processes, methods, tools, models, product structures, division of work, logistics, maintenance, and long term strategies. From a software engineering perspective, the automotive industry is an ideal and fascinating application domain for advanced techniques. Although the automotive industry may adopt general results and solutions from the software engineering body of knowledge gained in other domains, the specific constraints and domain specific requirements in the automotive industry ask for individual solutions and bring various challenges for automotive software engineering. In cars we find literally all interesting problems and challenging issues of software and systems engineering.

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Service-oriented software systems rapidly gain importance across application domains: They emphasize functionality (services), rather structural entities (components), as the basic building block for system composition. More specifically, services coordinate the interplay of components to accomplish specific tasks. In this article, we establish a foundation of service orientation: Based on the Focus theory of distributed systems (see Broy and Stølen [2001]), we introduce a theory and formal model of services. In Focus, systems are composed of interacting components. A component is a total behavior. We introduce a formal model of services where, in contrast, a service is a partial behavior. For services and components, we work out foundational specification techniques and outline methodological development steps. We show how services can be structured and how software architectures can be composed of services and components. Although our emphasis is on a theoretical foundation of the notion of services, we demonstrate utility of the concepts we introduce by means of a running example from the automotive domain.

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