Greater transparency is increasingly seen as the answer to a wide range of social issues by governments, NGOs and businesses around the world. However, evidence of its impact is mixed. Using case studies from around the world including India, Tanzania, the UK and US, Transparency and the open society surveys the adoption of transparency globally, providing an essential framework for assessing its likely performance as a policy and the steps that can be taken to make it more effective. It addresses the role of transparency in the context of growing use of surveillance and database driven decision making by governments and businesses. The book is written for anyone involved in the use of transparency whether campaigning from outside or working inside government or business to develop policies.