This recent JRC report, from our colleagues in T.1 Unit, aims to be a practical guide to adopting innovative solutions for data sharing at the local level by leveraging the sandboxing approach. It is conceived as a practical orientation for a wide range of public administrators who are eager to develop or improve, data ecosystems in their local contexts. The term 'sandbox' refers to an environment that allows us to safely experiment with innovative solutions that allow for an agile and inclusive approach to foster hands-on experience for testing new applications or new organisational approaches.