762 ITU‐T's Technical Reports and Specifications 5 Overview of key performance indicators (KPIs) in a city context KPIs of SSC consist of two series of deliverables: KPI definitions and KPI metrics and evaluation. The series of KPI definitions deliverables include: Technical specifications on key performance indicators (KPIs) related to the use of information and communication technology (ICT) in smart sustainable cities [ITU‐T L.KPIs‐ICT]. This document lists the KPIs focusing on ICT usage in SSCs. Technical specifications on key performance indicators (KPIs) related to the sustainability impacts of information and communication technology (ICT) in smart sustainable cities [ITU‐T L.KPIs‐impact]. This document lists the KPIs proposed for ICT impact on sustainability. Technical report on Supplement on key performance indicators (KPIs) for smart sustainable cities [ITU‐T L.KPIs‐Sup.]. This document provides information regarding KPIs and evaluation index systems of smart cities, KPIs of sustainable cities, etc. The Technical Specifications, under development within the Focus Group on Smart Sustainable Cities (FG‐SSC), are expected to cover the examples of metrics and examples of evaluation of indicators of [ITU‐T L.KPIs‐ICT] and [ITU‐T L.KPIs‐impact], and are expected to become ITU‐T Recommendations. 6 Key performance indicators 6.1 Dimensions of KPIs Technical Specifications on KPIs take into consideration the definition of SSC from ITU‐T FG‐SSC [ITU‐T TR SSC Def.], the City Prosperity Index of UN‐Habitat [UN‐Habitat report], and [ISO 37120]. The proposed set of KPIs focuses specifically on a set of ICT‐related indicators for smart sustainable cities and does not cover all KPIs of cities contained in [ISO 37120]. The dimensions of KPIs can be categorized as shown in Figure 1: Information and Communication Technology2 Environmental sustainability Productivity Quality of life Equity and social inclusion Physical infrastructure. 2 In the UN‐Habitat prosperity index, ICT forms part of the general ‘Infrastructure’ category. In the FG‐SSC structure, ICT is defined as a separate category to highlight the focus of ITU.