This book analyses the public accountability of political actors in contemporary democratic states. Accountability as understood here is a necessary condition of democracy: delegation of power with transparency and supervision over those who are chosen to exercise the power of the state. The authors identify paths of executing accountability in the electoral process, as well as in traditional instruments of parliamentary scrutiny and other relationships between the legislative, executive and judicial branches. They track how well-known mechanisms of democracy fulfil the need to report on the exercising of an entrusted power. They also explore how new developments in the constitutional framework, that is, the post-evaluation of legislation, and beyond it in mass social movements, Big Tech companies and social media, are changing the classic and established concepts of accountable power. The book will be a valuable resource for academics, researchers and policymakers working it the areas of Constitutional Law and Politics and Accountability Studies.