Janja Vrzel, a student of Ecotechnology, who visited Ludwig-Maximilians-Universität Munich in Germany, prepared her doctoral dissertation at the Jožef Stefan International Postgraduate School, covering a wide range of knowledge, ranging from geochemistry, hydrogeology, hydrology, processing of large databases and programming, and has received additional assistance in hydrological modeling in this mobility. Collaboration proved to be an exceptional contribution to the quality of her doctoral dissertation, since the original plan for the simulation of groundwater flow was expanded. She individually simulated both the most important groundwater sources in this system. This is a hydrological model with precise spatial and temporal resolution. At the same time, the mobility contributed significantly to the development of a student's career, she visited a number of international events and learned how to work at one of the most successful universities on a global scale, she also improved both her English and German.