The challenge of holding police to account is a fundamental one for any society that values the rule of law, liberty, and freedom for citizens. This book argues that conventional approaches to the problem of 'guarding the guards' need to be extended, since new technologies and modes of managing and delivering policing can be considered as forms of governance capable of developing accountability. It argues that social media, surveillance technology, promotion of ethics and integrity, cultural change, and strategies such as evidence-based policing need to be considered as efforts to direct and control officer behavior, and are, therefore, practices of accountability.