38 ITU‐T's Technical Reports and Specifications Glossary API Application Programming Interface BAS Building Automation System BREEAM Building Research Establishment Environmental Assessment Methodology BRT Bus Rapid Transit FG‐SCC ITU‐T Focus Group on Smart Sustainable Cities GDP Gross Domestic Product GIS Geographic Information System GPS Global Positioning System GRP Gross Regional Product GSM Global System for Mobile communication HSPA High Speed Packet Access HTML HyperText Markup Language HVAC Heating, Ventilation, Air Conditioning IAQ Indoor Air Quality ICT Information and Communication Technology IoT Internet of Things IP Internet Protocol IPv6 Internet Protocol version 6 IT Information Technology ITS Intelligent Transport System KPI Key Performance Indicator LEED Leadership in Energy and Environmental Design LF Labour Force LTE Long‐Term Evolution M2M Machine‐to‐Machine MOOC Massive Open Online Course MWh Megawatt hour NO Nitrogen Oxides PC Personal Computer PPP Purchasing Power Parity PSIM Physical Security Information Management QoL Quality of Life R&D Research and Development RFID Radio Frequency Identification Device SCADA Supervisory Control and Data Acquisition SCC Smart Sustainable Cities SDO Standards Development Organization SG Study Group SNS Social Network Service SO Sulfur Oxides