This scholarly book has been written as a timely and comprehensive reference for several classes of readers who are interested in the interplay between computing, ICT, sustainable development, sustainability science, urbanization, and urban vii design and planning. It is therefore intended to help to explore the field of smart sustainable cities in its complexity, heterogeneity, and breadth, the many faces of a topical subject that is of major importance for the future, and that encompasses so much of modern urban life in an increasingly technologized, computerized, and urbanized world. Indeed, sustainable urban development is currently at the centre of debate in light of several ICT visions becoming concurrently achievable and deployable computing paradigms, and shaping the way cities will evolve in the future and tackle complex challenges with support of advanced technologies.