Our interest in SUS is to detect, define, and address externalities associated with urban living and environments, focusing on ultimately improving human and planetary wellbeing. This requires systemic understanding on urban areas as parts of local and global systems, and urbanization as process that unfolds and affects multiple levels of human behavior, ranging from consumption choices to wellbeing outcomes. We aim to develop new knowledge on how different types of built environments interact with social and ecological sustainability, and thus ultimately help planning better cities. To accomplish these aims, we use mostly quantitative methods but also focus on developing theoretical understanding of urban sustainability. The research on SUS is at heart transdisciplinary and conducted in close collaboration with methods from economics and spatial sciences, as well interacting with relevant theories in political and economic geography, urban sociology as well as urban and spatial planning.