ABSTRACT This research is an effort to analyze differences between the Communism and Orthodox Marxism\u27 concept of revolution. This research proceeds through describing each standpoints and arguments that supporting their concept of revolution. The material objects of this research are Kautsky\u27s standpoint as the leader of Orthodox Marxism, and Lenin\u27s standpoint as the main man of Communism. The formal object of this research is a political philosophy\u27 perspective as a paradigm that being used to examined revolution concept that forwarded by Lenin and Kautsky in order to gain a new understanding about their concepts of revolution. This research is using philosophical hermeneutic method, which is the method to understands the Len...