Introducing data spaces into society makes us designers of a new world exploiting the sharing of data in a totally new way. As designers, we need to know what we are doing, business activities will not be the same as before, business processes will be re-engineered, and new skills are necessary to build data ecosystems. This track will bring together leading initiatives that are paving the way for what could become functional implementations of European-governed data sharing spaces. We want to help data space designers to understand and delineate what is required to create a successful data space and what kind of business perspectives and building blocks are needed. Furthermore, we want to be able to evaluate the maturity level of current implementations and their learnings in order to support convergence on a wider scale.