90 ITU‐T's Technical Reports and Specifications Ref. No. Category Definitions/Features Key concept/ Keywords Source 58 Government/ International organization In preparing this report, we used the smart sustainable city model, which identifies the presence and convergence of six areas: economy, mobility, environment, citizenship, quality of life, and, finally, management. A city can be defined as smart when it displays a positive performance in these six areas, and when it has been built based on a \"smart\" combination of elements (communication, infrastructure, economic development) and on purposeful and independent citizen activities (participation, education) that make sound management of natural resources through participatory governance. Convergence, integration, economy, mobility, environment, citizenship, quality of life, communication, infrastructure, economic development, citizen participation, education, natural resource management, participatory governance. Azkuna (2012b) 59 Government/ International organization A type of city that uses new technologies to make them more liveable, functional, competitive and modern, the promotion of innovation and knowledge management, bringing together six (6) key fields of performance: economy, mobility, environment, citizenship, quality of life and, finally, management. Liveable, technology, citizens, quality of life, management, economy. Azkuna (2012c) 60 Government/ International organization Smart sustainable cities combine diverse technologies to reduce their environmental impact and offer citizens better lives. This is not, however, simply a technical challenge. Organizational change in governments – and indeed society at large – is just as essential. Making a city smart is therefore a very multidisciplinary challenge, bringing together city officials, innovative suppliers, national and EU policymakers, academics and civil society. Diverse technology, environment, quality of life, city officials, suppliers, policy makers, academics, civil society. European Commission (2014)