Edited by thought leaders in the fields of urban informatics and urban interaction design, this book brings together case studies and examples from around the world to discuss the role that urban interfaces, citizen action, and city making play in the quest to create and maintain not only secure and resilient, but productive, sustainable and viable urban environments. The book debates the impact of these trends on theory, policy and practice. The individual chapters are based on blind peer reviewed contributions by leading researchers working at the intersection of the social / cultural, technical / digital, and physical / spatial domains of urbanism scholarship. The book will appeal not only to researchers and students, but also to a vast number of practitioners in the private and public sector interested in accessible content that clearly and rigorously analyses the potential offered by urban interfaces, mobile technology, and location-based services in the context of engaging people with open, smart and participatory urban environments.