The development of modern driving assistant systems (assisted as well as automated) requires extensive testing and exact specification to ensure the quality of the developed systems. Therefore, scenarios are used throughout the whole process to act as accompanying artifact to assist within the design, implementation and testing procedures. Depending on the respective use case, different levels of abstraction, used natural languages and degrees of completeness are used for the scenarios. Due to the lack of an appropriate method for the specification of abstract scenarios that satisfies those needs for efficient usage, the language stiEF (acronym for “scenario-accompanied, text-based, iterative Evaluation of automated driving Functions”) was designed. This paper provides all details about the syntax and semantics of stiEF for the freeway domain. This enables the reader to read, understand, write and use stiEF for scenario descriptions.

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