ITU‐T's Technical Reports and Specifications 65 7 Conclusions This Technical Report provides an insight into what is meant by a \"smart sustainable city (SSC)\" and the underlying factors that make a city smart. This Technical Report analysed approximately 120 existing definitions of smart sustainable cities from various sources to determine a common theme identifying a smart sustainable city. In addition, this Technical Report considered the key indicators and categories which should be taken into account for a smart sustainable city. A list of 30 key terms to be included in a standardized definition were also identified. Although this Technical Report is based on secondary data sources, it can be extremely useful to understand the concept of a smart sustainable city. Similarly, this Technical Report can form the basis of developing a standard definition of a global smart sustainable city and subsequently can be used to develop a framework to measure the performance of a smart sustainable city. Finally, a proposed comprehensive definition of a smart sustainable city has been presented.