ITU‐T's Technical Reports and Specifications 69 Ref. No. Category Definitions/Features Key concept/ Keywords Source 9 Academic The 'eco‐cities' theme does not stand alone but is situated in a complex array of relevant variations of sustainable development, sustainable urban development, sustainable communities, bioregionalism, community economic development, appropriate technology, social ecology, green movement. Ecology, technology, communities. Roseland (1997) 10 Academic A sustainable city is one in which its people and businesses continuously endeavour to improve their natural, built and cultural environments at neighbourhood and regional levels, whilst working in ways which always support the goal of global sustainable development. Business, natural environment, built environment, cultural environment. Haughton et al. (1994) 11 Academic We say that a sustainable city is one in which the community has agreed on a set of sustainability principles and has further agreed to pursue their attainment. These principles should provide the citizenry with a good quality of life, in a liveable city, with affordable education, health care, housing, and transportation. Quality of life, lovable city, education, health care, housing Munier (2007) 12 Academic A sustainable city can broadly be defined as \"one that has put in place action plans and policies that aim to ensure adequate resource availability and (re)utilization, social comfort and equity and economic development, and prosperity for future generations\". Policies, resource availability, social comfort, economic development, future generations. Jingzhu (2011a) 13 Academic A sustainable city is one that relates its use of resources and its generation and disposal of wastes to the limits imposed on such activities by the planet and its organisms. Resources, waste, planet and organisms. Jingzhu (2011b)