Development of scientific and objective methodologies for the assessment of tourism sustainability is an ecessary feature of the idea of sustainable development. If sustainable development is one of the tourism industry’s major contemporary objectives, then the industry needs to be able to measure its performance and impacts in this area. This study addresses a question that has arisen in the 1990s in tourism, namely: How can progress towards sustainable tourism development be measured? The question is basedon the premise that if tourism contributes towards a sustainable society, then the extent to which it is doing so should be measured. The purpose of this study is to develop a procedure for assessing tourism sustainability in terms of system quality. The contribution of the current study is, therefore, to present a practical and useful model for the assessment of tourism sustainability. The major contributions of this paper are as follows: First, to incorporate systematically existing political, economic, socio-cultural and environmental impact studies (the supply side), and tourism service quality considerations (the demand side) into the sustainability assessment process. Thus, this research seeks to improve the utility of existing tourism impact and service quality studies. Second, to provide quantitative data on tourism sustainability assessment, enabling stakeholders to understand easily and clear ly the viability of a tourist destination. Third, to propose a succinct and accessible presentation format in order to illustrate sustainability levels of tourism indicators. Finally, to encourage stakeholders to apply appropriate information in the process of tourism planning and development (e.g. decision on priorities in policy implementation and resource allocation, marketing and promot ion strategy, and involvement of stakeholders).