Urban development and alterations in local/urban/sub-urban expansion plans is usually based on the analysis of spatial indicators and how they induce the future development in a specifi c area. For this structural reason the alterations of urban plans mainly occur under a surface observation and analysis of the spatial characteristics. Examining the issue under a more comprehensive framework we also focus on other characteristics such as social and economic policies, health and education, transportation, commercial, etc. that dominate on the devel- opment. Thus, urban sustainability indicators from a broad spectrum of activities should be introduced during urban planning. This paper investigates and analyzes the use of such urban sustainability indicators in spatial planning through the use of geographical information systems (GIS) designed for this reason. In the mid-90s, the European Commission prepared a report called 'European Sustainable Cities Report' (1). In this report, the Commission recognized the need for sustainability indicators as a tool for quantifying the return of sustainability. Since sustainability is a rational policy objective, it is possible to measure whether we have hysteresis or progress. In addition, the World Bank uses indica- tors as performance measures. All institutions involved in indicators' defi nition appear to consent that indicators are a useful tool, both for assessing policy measures and policy making as well. In both cases, these organizations stress their limitations. The use of sustainability indicators is capable of playing a catalytic role in supporting planners, decision, and policy makers as well as other relevant stakeholders to assess urban development on one hand, while on the other to endorse the planning and implementation of sustainable spatial policies. Furthermore, the expansion and development (local) plans implemented in a more general (met- ropolitan) approach will also be supported and monitored. In addition, decision makers and more policy makers will be enabled to discard groundless and purblind individual demands and requests, often based on speculation and personal gains rather than the chase of durable sustainability and societal benefi ts. The paper aims to introduce the integration of urban sustainability indicators into the spatial plan- ning process through geographical information systems (GIS). An appropriate sustainability indicators framework set is introduced. Furthermore, the procedure continues throughout the design and development of the appropriate information technology infrastructure to support the update, monitoring, and reporting of these indicators. Finally, these indicators are used as an urban policy tool in the decision making process. In section 2, an introduction in urban sustainability indicators is mentioned. The background information and the defi nition of an indicative proposed set of indicators, spread in various thematic areas (e.g. social, economy, environment, etc.), are explained. This set originates from the URBAN- GUARD project, which took place in Cyprus as an EU co-funded project via LIFE scheme. In this section, the spatial dimension of indicators is discussed while a proposed geodatabase model for
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