Thecomplexity of nowadays car manufacturing processes increases constantly due to the increasing number of electronic and digital\nfeatures in cars as well as the shorter life cycle of car designs, which raises the need for faster adaption to new carmodels. However,\nthe ongoing digitalization of production and working contexts offers the chance to support the worker in production using digital\ninformation as well as innovative, interactive, and digital devices.Therefore, in this work we investigate a representative production\nstep in a long-term project together with a German car manufacturer, which is structured into three phases. In the first phase, we\ninvestigated the working process empirically and developed a comprehensive and innovative user interface design, which addresses\nvarious types of interactive devices. Building up on this, we developed the device score model, which is designed to investigate\ninteractive system and user interface in production context due to ergonomics, UI design, performance, technology acceptance,\nand user experience. This work was conducted in the second phase of the project, in which we used this model to investigate\nthe subjective suitability of six innovative device setups that implement the user interface design developed in phase one in an\nexperimental setup with 67 participants at two locations in south Germany.The major result showed that the new user interface\ndesign run on a smart phone is the most suitable setup for future interactive systems in car manufacturing. In the third and final\nphase, we investigated the suitability of the two best rated devices for long term use by two workers using the system during a full\nshift. These two systems were compared with the standard system used.The major conclusion is that smartphones as well as AR\nglasses show very high potential to increase performance in production if used in a well-designed fashion.
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