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This open access book outlines the latest results in analysing, assessing, and managing terrorist risk in the urban outdoor built environment. In detail, contents refer to the outdoor Open Areas (such as streets, squares, urban parks and other public spaces in our cities) exposed to such violent events considering the physical elements and properties of the built environment and users. PThe built environment features, including layout, use and management, are combined with terrorist threats issues and user behaviours in emergency conditions, to determine a set of complementary tools for the reduction of risk and increase of urban resilience. The contents hence provide different levels of tool analysis, for risk scenario definition, risk assessment, mitigation strategies design and effectiveness evaluation, considering traditional approaches about the issue along with simulation-based approaches relying on understanding and representing user behaviors. This “behavioural design” approach offers the opportunity to manage the level of risk for specific real urban cases over going the normative limitations in Europe that are only referred to few countries and sometimes deal with the prevention of violent acts by intelligence activities as the exclusive way to face this issue. In addition, the focus on the characters of cultural and historic places and their resilience is increasing by means of introduction of mitigation and compatible solutions providing a complementary chapter for the design of resilient cities in all of their peculiarities (peripheries, consolidated, and historical). In this sense, it is one of the first organized attempts to analyse the main limitations of current solutions in these outdoor Open Areas and, at the same time, to clearly introduce the importance of human behaviours and the various choices in emergency evacuation conditions, thanks to the proposed behavioural-based simulation approach. The attention is focused on a critical aspect for historic spaces, where morphological conditions are fixed values. Thus, this book represents a sort of guidelines about these user-related issues during such violent events and is useful to both professionals and researchers in the areas of security and urban administration.

The book provides an overview of the Slow Onset Disasters (SLOD) in the urban built environment discussing potential strategies to assess and mitigate multiple climate change related risks. Climate change evidence has been reported in the last decades, suggesting that the anthropogenic activities are accelerating these changes towards a warmer and more polluted environment. In this context, SLODs have been linked to climate change related disasters and have been stated to have a higher impact risk within dense built environment (BE). Therefore, the book presents a description of the most relevant SLODs, their significance, and confluence, the way in which scientists and entities are monitoring their progression at different scales, a structured risk assessment strategy and the deconstruction of the BE characteristics that make it more prone to SLODs risk. In addition, it highlights the necessity of adapting the traditional risk assessment methods, to account for different vulnerabilitytypes, including the morphology and materiality of the BE, and the BE users'characteristics. In fact, individual features influence users'responses and tolerance to environmental stressors, because of age, health, gender, habits, and behaviour, thus impacting the users'vulnerability. Exposure can then amplify these issues, since it defines the number of users that can be effectively affected by the SLOD. Starting from this perspective, the book first traces literature-based correlations between individual features, use behaviour, and individual response to the SLOD-altered open spaces. Then, a novel methodology, to quantify the variations of users'vulnerability and exposure, is offered, to support designers in quickly defining input scenarios for risk assessment and mitigation. Lastly, it demonstrates, through a case study, the SLOD risk assessment framework proposed and the evaluation of the efficacy of risk mitigation strategies.