Preface.- Acknowledgments.- About the Contributors.-Part 1: The data shake: open questions and challenges for policy making.- Cha[ter 1. The data shake: an opportunity for experiment-driven policy making.- Chapter 2. data ownership and open data: the potential for data-driven policy making.- Chapter 3. Towards a public sector data culture: data as an individual and communal resource in progressing democracy.- Chapter 4. Innovation in data visualisation for public policy making.- Part 2: The PoliVisu project.- Chapter 5. Policy-related decision making in a smart city context: the polivisu approach.- Chapter 6. Turning data into actionable policy insights.- Chapter 7. Data-related ecosystems in policy making. the polivisu contexts.- Chapter 8. Making policies with data: the legacy of the polivisu project