68 ITU‐T's Technical Reports and Specifications Ref. No. Category Definitions/Features Key concept/ Keywords Source 7 Government \"A city that monitors and integrates conditions of all of its critical infrastructures including roads, bridges, tunnels, rails, subways, airports, sea‐ports, communications, water, power, even major buildings, can better optimize its resources, plan its preventive maintenance activities, and monitor security aspects while maximizing services to its citizens.\" Integrated infrastructure, resource optimization, preventive maintenance, monitors security, and maximizes services. Hall et al. (2009) 8 Academic The term \"smart city\" is not used in a holistic way but with reference to various aspects which range from ICT districts to smart inhabitants in terms of their educational level. In addition, the term often refers to the relation between city government and citizens (e.g. good governance or smart governance). There is often a strong reference to the use of modern technology in everyday urban life, which includes innovative transport systems, infrastructures and logistics as well as green and efficient energy systems. Additional 'soft factors' connected to urban life for a Smart City include: participation, security/safety, cultural heritage. In conclusion, the literature review reveals the following main dimensions (or clusters of aspects): (i) smart governance (related to participation). (ii) smart human capital (related to people). (iii) smart environment (related to natural resources). (iv) smart living (related to the quality of life) and smart economy (related to competitiveness). Living, governance, economy, infrastructure, ICT, citizens, transport, energy, urban life. Lombardi (2011)