This dissertation follows the deconstruction of a traditional concept of language and the development of an enlarged notion of writing presented by Derrida in the first part of the book Of grammatology. The first chapter approaches the perception of a degradation of the writing in relation to speaks inherent to the traditional concept of language that marks all western thought, inscribing it in what the philosopher calls a metaphysics enclosure. Pointing a movement of overflow of the concept of language, that can be felt better than never in the XX century, Derrida announces the possibility of a radical notion of writing that allows us to think differently than the binary opposition logic. The second chapter is dedicated to Derrida’s reading of Saussure’s “Course in general linguistics” and his deconstruction of the logocentric concept of the linguistic sign and the presentation of some of his most important quasi-concepts as trace and différance. Finally, the third chapter brings the discussion about the condition of (im)possibility of every scientific project taking into account Derrida’s quasi-concept of writing.