The 1980s and 1990s have seen several authoritarian governments voluntarily cede power to constitutionally elected democratic governments. John Londregan uses Chile as a case study of this phenomenon, exploring what sorts of guarantees are required for those who are ceding power and how those guarantees later work out in practice. He constructs an analytical model of a democratic transition and provides a new statistical technique for analyzing legislative votes, based on a detailed empirical analysis of Chile's legislative politics.