Besides the ‘technical’ learnings of the Design Thinking experience, i.e. prototyping and rapid ideation exercises, a social environment is created in which mistakes are accepted. Our students consistently highlighted the atmosphere in class as one of the most decisive –and original- components that enabled them to generate out-of-the-box ideas. From a teacher-viewpoint, the development of this psychologically safe atmosphere stands out as crucial success factor. And a very difficult one to implement. Short warm-up games in the beginning and the playground-like lecture room, lay the foundation to open up and leave institutionalized ways of problem-solving and team interaction behind ("quantity of solutions over quality of solutions"). While students were working through their ideation and prototyping cycles, we were able to capture a variety of behavioral changes through observation. Design Thinking forces students to act on a problem very early in the process. We are all trained to solve problems in a structured manner and Design Thinking disrupts this routine. This approach might feel uncomfortable in the beginning, but will be rewarded later on: we frequently observe how impressed students are after they completed crafting a seemingly hasty solution to a problem. They look at their output realizing that imperfection and preliminary, "raw" results are not harmful and nothing you have to be ashamed for, but provide deep insights to successfully continue with the refinement of your product or to even drop it and start from scratch. At the end of last year's term, we conducted a short survey, in which students reflected on their individual take-aways from the course. Students described these personal aha! moments that they experienced throughout the course, their personal growth and changes in thinking style which they want to preserve and transfer to other problem statements. We believe our setup with interviews, observations and a tool for students' self-assessment will deliver tangible results to make this transformation visible.