The current great interest in the question of parliamentarism versus presidentialism coincides, not surprisingly, with the wave of democratization and the writing of new democratic constitutions that has swept the world since the mid-1970s, beginning in Southern Europe and spreading to Latin America, East Asia, eastern Europe, the Soviet Union and South Africa. The book is a comparative study of Parliamentary system and the Presidential system. The necessity of maintaining and equilibrium between the Presidency and democracy; also between Parliamentarism and democracy; also between Parliamentarism and democracy is a central theme of this book. The book is primarily a study in American and British public law. The approach is partly historical; partly analytical and critical. For the Presidency unfolds a daily drama of the reciprocal interplay of human character and legal concept that no other office on earth can quite emulate. Besides, the book also treats the intermediate democratic forms such as French-style semi-presidential model. It was also adopted in Portugal and Sri Lanka and has been also proposed in several Latin American countries, and certain political experts and politicians recommend it for India. And, therefore, receives the greatest attention. The main subject of the debate has been the respective advantages and disadvantages of Parliamentary and Presidential government. The second important subject is the origins and causes of these alternative forms of government. And, therefore, receives the greatest attention. The main subject of the debate has been the respective advantages and disadvantages of Parliamentary and Presidential government.