This chapter describes the first year of a PhD project considering the question of how a teacher training focusing on the implementation of interdisciplinary STEM modelling projects based on the context of a Segway can be designed successfully. It is quite ambitious to answer this question, since some deeper knowledge about physical, technical and mathematical concepts is needed. Nevertheless, based on 2-day teacher trainings, four interdisciplinary STEM modelling projects were implemented, in which grade 12 students have gained insight into the control of a Segway. After a short explanation of the mathematical background, we describe the design of the teacher training as well as the resulting modelling projects. The aim of this research is to identify successful factors of the teacher training which will be analysed in a forthcoming period of the project.