Parliamentary Democracy provides a comparative study of the parliamentary regimes since 1789. The book covers the road to parliamentarization of former constitutional monarchies and the creation of parliamentary regimes by exercising the constitution-making power of the people. What has been called democratization in most of the 'transitology' literature was until 1918 mostly only 'parliamentarization'. Democratization of the regimes frequently caused a certain destabilization of the parliamentary regimes by new parties and extremist movement entering the political arena. This is the first book to cover the entire range of parliamentary systems, including the semi-presidential systems.