This volume is the first comprehensive analysis of a new type of executive instability without regime instability in Latin America referred to as "presidential breakdown." It includes a theoretical introduction framing the debate within the institutional literature on democracy and democratization, and the implications of this new type of executive instability for presidential democracies. Two comparative chapters analyze the causes, procedures, and outcomes of presidential breakdowns in a regional perspective, and country studies provide in-depth analyses of all countries in Latin America that have experienced one or several presidential breakdowns: Argentina, Bolivia, Brazil, Dominican Republic, Ecuador, Guatemala, Paraguay, Peru, and Venezuela. The book also includes an epilogue on the 2009 presidential crisis in Honduras.