HUTwin aims to create model-based interacting digital twins (DTs) to understand human-device interaction. Digital Twins are becoming common in the predictive maintenance of complex systems. These twins are mainly based on sensor information of the real system during its lifetime. The Twin predicts the behaviour of the system and thereby the required maintenance actions during the lifetime. The twin will help to speed up the innovation process, can help the engineering process, and can predict quality and reliability of the produced system. Special cases of Twins are those that try to predict human-device interaction either in the development phase or during the lifetime of the device.