Where are the biggest smart cities - and why are they smart?

The idea of "smart cities" is gaining steam around the globe as cities are speeding the development of automated processes and services in an effort to better serve residents. Wireless carriers, network vendors and systems integrators are all looking for a piece of the pie, as research firm Gartner predicts there will be 9.7 billion connected things in smart cities by 2020.

But what does it even mean for a city to be considered "smart?" How does one assess how much progress a city has made in becoming smarter? MachNation co-founder and CTO Dima Tokar noted that smart cities are still an "evolving trend, rather than a predefined concept." This FierceWireless:Europe special report looks at some of the smartest cities in the world and dives deep into the three top criteria that define smart cities. 

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