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Abstract-Sustainability has become a fundamental element for most countries in this new era. Its concept is found to be very complex and difficult to measure. As it is essential to obtain relevant information to take long term management decision, sustainability should be measured urgently. The subject is treated using an appropriate technique namely the fuzzy approach. It further seems appropriate to deal with ambiguity and vague situations where mathematical formula is ineffective. The model describes how fuzzy logic can be applied in measuring development sustainability using indicators. The model intends to treat inputs from individual components (economic, environmental and social) and they are combined using fuzzy rule bases to provide an overall measure of sustainability. It may then be addressed to scientists and policy makers as they move towards a sustainable path in the near future.