ITU‐T's Technical Reports and Specifications 153 In order to provide a complete list of KPIs that can be used for city and municipal administrations, city residents, development and other organizations of operating in SSC (e.g., producers, service providers, planning units), as well as evaluation or ranking agencies, the FG‐SSC has developed a series of documents: Technical Specifications on “Overview of key performance indicators in smart sustainable cities”. Technical Specifications on “Key performance indicators related to the use of information and communication technology in smart sustainable cities”. Technical Specifications on “Key performance indicators related to the sustainability impacts of information and communication technology in smart sustainable cities”. Technical Report on “Key performance indicators definitions for smart sustainable cities”. The Technical Specifications define standardized KPIs with the aim to provide criteria to evaluate existing cities (e.g., single cities from the administrative point of view, or the union of small cities in the same area that share some services), but not to compare them. It will enable cities and municipal administrations to understand the progress of SSC development and design suitable strategies, city residents to know the details of development of SSC, and development and operation organizations of SSC to fulfil the tasks related to information provision. The evaluation principles chosen to define dimensions, sub‐dimensions and indicators are the following: comprehensiveness (i.e., should cover all SSC aspects), comparability (i.e., should be able to compare scientifically different phases of urban development and different cities), availability (i.e., quantitative data must be accessible and scientific), independency (i.e., the indicators in the same dimension must be independents), simplicity (i.e., concepts and calculation must be simple and intuitive) and timeliness (i.e., ability to produce KPIs with respect to emerging issues in SSC construction). The dimensions of KPIs can be categorized as follows (shown in Figure 2): Information and Communication Technology Environmental sustainability Productivity Quality of life Equity and social inclusion Physical infrastructure