ITU‐T's Technical Reports and Specifications 855 First‐level index Second‐level index Third‐level index Functional improvement of city Waterworks Drainage system Water saving application Gas system Garbage classification and disposal Heat supply system Lighting system Underground pipelines and spatial integrated administration Smart governance and service Governance service Decision‐making support Open information Online service Governance service integrated system Basic public services Basic public education Employment services Social insurance Social services Health care Public culture and sports Service for the handicapped Basic housing guarantee Application service Intelligent transport system (ITS) Smart energy Smart environmental protection Smart land resource administration Smart emergency response