The notion of subject is a multiple, polyvalent, overdetermined concept, in short, a problematic concept. Aiming at its clarification the place statute of the subject is discussed starting with the consideration of its respective processes of constitution in so much in Jurgen Habermas as in Michel Foucault. It is examined, fundamentally, the relation of the subject toward language and history. By the way of the subjective constitution highly different productive modalities are distinguished, that, at the same time, imply divergent theoretical concepts, causing contrasted subjective modalities, with extremely discordant possibilities and ways of action. Recovering certain concepts of the Critical Theory there is proposed a type of dialogical subjectivity, that collects these differences without annulling them or to ignore them.