This project reframes key challenges that underlie modern policing in a socio-technical world; a world instrumented with mobile and ubiquitous computing technologies, in which many citizens and communities live, work and play, but which must also manage threats to their wellbeing and their rights. The project aims to support a new engagement between authorities (such as the police) and communities of citizens in order to better investigate (and in the long term reduce) potential or actual threats to citizen security, safety, and privacy. This includes both empowering the police by opening up new ways of citizens providing data in ways that protect privacy and anonymity, and empowering citizens by using these new technologies to also hold the police to account. We will be harnessing many of the so-called Internet of Things, Smart City and Smart Home technologies to encourage and allow citizens to help the police collect and analyse disparate data to improve public safety at both local and ultimately national levels. The project will adopt a multi-disciplinary approach, drawing on the disciplines of software engineering for ubiquitous systems, social and cognitive psychology, and digital forensics / policing.