Barcelona, Singapore, Berlin, London, … What have these cities in common? They all want to become the first smart-cities. However, what do we mean by “Smart-Cities”? Have cities been not smart so far? Which concepts underlie this trendy locution? A smart-city is not only a connected city, where millions of data are crunched to offer new services, but also a resilient, energy and resource efficient and sustainable city. What a great program!