Studies have shown that teachers find it difficult to prepare contents in the area of embedded systems and hardware/software co-design for school students. The goal of this paper is to support them by obtaining a clearly structured representation of the key concepts from this area in order to be able to derive concrete competence goals based on them later on. We apply a method for identifying the key concepts of a subject area within computer science, which has already been tested in the field of data management, to embedded systems and the related hardware/software co-design. Here, we present the procedure (literature selection, content analysis, concept clustering, and structuring) and the results of this process.