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Abstract
Cities must improve their quality without an increase, or ideally with a decrease, in the amount of environmental load to become more sustainable. In order to monitor city's progress towards sustainable development goals, a Comprehensive Assessment System for Built Environment Efficiency (CASBEE) tool, named CASBEE-City has been developed. All cities in Japan are assessed from the following two aspects: environmental load (L) on the external environment and quality (Q), which represents the citizens' quality of life inside the city. Built environment efficiency (BEE = Q/L) is then calculated for the comprehensive assessment of each city. A high BEE value indicates that the city has excellent environmental efficiency. The assessment results are visually displayed on the map by using a geographic information system so that citizens, local government officers, and all other stakeholders can easily understand the actual status of their city in comparison with other cities in the country. This assessment and the visualization of the results are expected to support the realization of future sustainable cities.