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During the past decades much work has been done for establishing tools and techniques that support the design of software user interfaces such as GUIÂ¿s (Graphical User Interfaces). As software user interfaces seemed to adapt continuously to requirements, the interaction techniques of physical user interfaces (e.g. desktop PC, Notebook, PDA) principally remained the same. Moreover, physical user interfaces have been disregarded when speaking about user interface design in general. It is therefore not surprising that the methodologies used for physical user interface design are rather non-formal. This makes it complicated to sufficiently incorporate e.g. tasks, interactions and preferences of the user during the design process. As a result, contemporary physical user interfaces such as PDAÂ¿s, Smartphones and Notebooks are far from being adequate for supporting the user in his tasks the best possible way. This is especially true when considering the diversity of potential tasks and interactions of end users in industrial environments. Due to this fact, the authors of this paper are convinced that there exists a need for highly-specialised- and adaptive physical user interfaces. These new user interfaces can only turn out to be truly useful when appropriate methods are applied which are able to incorporate the specific context of the end user and of the environment during the entire design process. The authors of this paper invoke that model-based techniques have proven to be a well-established approach when it comes to designing useful software user interfaces. In analogy, it is argued that model-based techniques provide a promising approach when supporting the design of physical user interfaces such as wearable computing devices.