ITU‐T's Technical Reports and Specifications 49 Table of Contents Page 1 Introduction ........................................................................................................... 53 1.1 Scope .............................................................................................................. 53 2 Goals and motivation for a comprehensive definition ............................................ 54 2.1 Goals ............................................................................................................... 54 2.2 Lack of standardized terminologies ............................................................... 54 2.3 Need for a comprehensive definition............................................................. 55 3 Observations from literature .................................................................................. 55 3.1 Attributes ........................................................................................................ 55 3.2 Core themes ................................................................................................... 55 3.3 Infrastructure – Physical, service and digital .................................................. 56 4 Definitions and analysis .......................................................................................... 56 4.1 Sources of information ................................................................................... 56 4.2 Methodology .................................................................................................. 56 4.3 Approach ........................................................................................................ 57 5 Results .................................................................................................................... 58 5.1 Keyword analysis from definitions ................................................................. 58 5.2 Keyword grouping .......................................................................................... 60 5.3 Important terms to be included in a standardized definition ........................ 62 6 Recommended definition ....................................................................................... 63 6.1 Criteria for definition ...................................................................................... 63 6.2 Specification ................................................................................................... 64 6.3 Agreed definition by FG‐SSC ........................................................................... 64 7 Conclusions ............................................................................................................ 65 Annex 1 Definitions of a smart sustainable city .............................................................. 66 Annex 2 References for definitions ................................................................................. 113 Annex 3 Glossary of terms .............................................................................................. 122