ySKILLS is a four-year research project that aims to improve wellbeing and resilience by enhancing digital skills. To get closer to that goal, the project first developed a digital skills testing tool. The objective of the project was the development of a granular measurement tool for digital skills and knowledge that can be used for large-scale population research. The youth Digital Skills Indicator (yDSI) was developed through consultation with experts, cognitive interviews, pilot surveys and performance tests with young people across Europe.