ITU‐T's Technical Reports and Specifications 95 Ref. No. Category Definitions/Features Key concept/ Keywords Source 74 ITU Smart sustainable cities are well managed, integrated physical and digital infrastructures that provide optimal services in a reliable, cost effective, and sustainable manner while maintaining and improving the quality of life for its citizens. Key attributes of a smart sustainable city are mobility, sustainability, security, reliability, flexibility, technology, interoperability and scalability. Foundational aspects include economy, governance, society and environment with vertical infrastructures such as mobility, real estate and buildings, industrial and manufacturing, utilities ‐electricity and gas, waste, water and air management, safety and security, health care and education. All of these are woven into a single fabric with ICT infrastructure as a core. Well managed, integrated, digital infrastructure, optimize services, sustainability, quality of life, mobility, security, reliability, flexibility, technology, interoperability, scalability, economy, governance, society, environment, real estate and buildings, industrial and manufacturing, utilities ‐ electricity and gas, waste, water and air management, safety and security, health care and education, integrated, ICT. FG‐SSC‐0013 (2014) 75 ITU/ Government It is a city with a large, efficient and widespread technological network that fosters dialogue between citizens and everyday objects. It integrates the huge amount of information available to generate intelligence and improve daily life in a lifestyle that is increasingly \"smart\". It combines innovation with the environment, mobility and quality of life. It is a new phenomenon, complex and rapidly changing. Technological innovation moves in several directions (green buildings, smart mobility, e‐health, e‐government, etc.). ICT, integrated, quality of life, innovation, environment, mobility, green buildings, health, environment governance. FG‐SSC‐0014 (2013)