Cities are changing in pace with the rest of the world. Very quickly. As digitalisation creeps into every aspect of city dwellers’ lives, the emergence of more fluid and faster interconnected urban systems is definitely not far away. Technology can be an excellent accelerator, provided that the real uses and needs in changing cities are clearly identified at the earliest possible stage. SUEZ is focussing on six challenges to build a model of the city of tomorrow that meets the expectations of local authorities, who are demanding well-being and a high standard of communal life for their inhabitants.