This research project researched the effects of exaggerated feedback in playful digital interfaces on sustainable behaviour change. During this project, there was a focus on understanding the impact your design and research setup can have on users and society. I learned how to do A/B testing, semi-structured interviews and collect both qualitative and quantitative data (U&S). Which I later learned to characterise, compute and analyse through, for example, box plots or t-tests (MD&C).