Government agencies utilize urban heat vulnerability as a critical reference indicator for determining the need for mitigation activities. This concept has been frequently defined as the propensity of cities to incur negative impacts in response to the extremely high temperature. To face the impacts and challenges of heat vulnerability from various sectors -urban structure, building status, population, exposure, emissions, human health, and economy -a qualitative Multi-sector Causal Network (MCN) was designed to enable the application of decision-making crossing different governance departments. In this research, further quantitative analysis of the causality existing in the MCN was conducted to demonstrate the cause-effect flows, providing three levels of heat vulnerability indicators for future assessment based on the MCN. As a result, the research demonstrates that the abstract idea of urban heat vulnerability can be concretized by the outcomes it generates, which will aid urban decision-makers in the future in allocating resources more rationally to meet the requirements of diverse sectors in a balanced manner. Also, compared with other sectors, the study reveals that the economic sector has lagged in the research area of heat vulnerability, despite its importance in the network.
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