ITU‐T's Technical Reports and Specifications 71 Ref. No. Category Definitions/Features Key concept/ Keywords Source 19 Academic A smart city is referred to as the safe, secure, environmentally green, and efficient urban centre of the future with advanced infrastructures such as sensors, electronics, and networks to stimulate sustainable economic growth and a high quality of life. Safe, secure, environment, green, efficient, urban, future, infrastructure, sensor, electronics, networks, sustainability, economy, quality of life. Schaffers et al. (2012a) 20 Academic Major aspects highlighted in this paper balance different economic and social demands as well as the needs implied in urban development, while also encompassing peripheral and less developed cities. Economic, social, urban development. Schaffers et al. (2012b) 21 Academic A smart city as a high‐tech intensive and advanced city that connects people, information and city elements using new technologies in order to create a sustainable greener city, a competitive and innovative commerce and an increase in the quality of life with a straightforward administration and maintenance system of the city. Advanced, high‐tech, information, sustainability, green, competitive, innovation, commerce, quality of life, administration, maintenance. Schaffers et al. (2012c) 22 Academic A \"smart city\" is a city well performing in a forward‐looking way in the six characteristics (smart economy, smart people, smart governance, smart mobility, smart environment, smart living) built on the 'smart' combination of endowments and activities of self‐decisive, independent and aware citizens. Citizens, economy, people, governance, mobility, environment, living. Chourabi et al. (2012a)