This book familiarizes the English-speaking reader with the debate on the originality of Gramsci's thought and its importance for the development of Marxist theory. The contributors present the principal viewpoints regarding Gramsci's theoretical contribution to Marxism, focussing in particular on his advances in the study of the superstructures, and discussing his relation to Marx and Lenin and his influence in Eurocommunism. Different interpretations are put forward concerning the elucidation of Gramsci's key concepts, namely: hegemony, integral state, war of position and passive revolution.