Not only economic, urban systems are also ecological and social in nature. Correspondingly, sustainability is a circumstantial and complex concept. Measuring urban sustainability must therefore include people's attitudes and opinions towards a city. Consequently, an appropriate mechanism must be developed to specify the basic needs of residents and the limitations of the environment. Such a mechanism provides a monitoring function and displays complete information. Local governments are responsible for only a fraction of urban generation, accounting for their ability to fully grasp its context. Providing residents and governmental authorities with necessary information, through dialogue, is essential with respect to sustainability. Among various measurement tools, the Urban Indicators Programme (UIP) of UNCHS is appropriate for assessing development. This article examines the feasibility of applying UIP to evaluate the sustainability of Taipei City. The UIP includes key indicators and local indicators. Based on principles of sustainability, this work finally selects 49 indicators for use in Taipei's UIP (Table 1). A ten-year data set (1989-1998) is also collected to assess Taipei's sustainability. Analysis results indicate that Taipei City performs well in the categories of background information, local government, and housing. Additionally, only four to five years of data are available concerning infrastructure and environmental management. Moreover, no data are available for thirteen indicators. No complete perspective of the sustainability of Taipei City can presently be taken.