Transformation and class struggle: the concept of practice in Louis Althusser's philosophy

The following study is focused on the concept of practice in the philosophy of Louis Althusser. It analyses the modifications in concept in the theoretical production of the author during the sixties and the mid-seventies. The article explores the definition of the transforming nature of practices, as well as the impact of the concept of 'Theory of theoretical practice' in the general concept of practice. It establishes the abandonment of theory and practice as a couple towards the definition of multiple practices located in the Marxist social whole. Finally, the study presents the transformations in the concept of practice in the mid-seventies due to the importance of the concept of class struggle and the definition of philosophy as a battlefield. Finally, it shows the relevance of the principle of the primacy of practice and of the non-philosophical exterior formed by the multiple practices in the determination of a materialist position in philosophy.