In this work, researcher Pascal Richard attempts to understand the role of legal norms within the philosophical discourse of law. He analyses the concept of "norm" by invoking the philosophy of language and the philosophy of mind. In the first section, "Rules as Intentional Systems", he seeks to demonstrate the intentional function of legal rules and introduces what he calls the intentional strategy that guides us to necessary behaviours. The norm has a dual nature, oscillating between the form of an "action plan" and an "interpretive scheme". In the second section, "Intentionality Constructed within the Ordinary Use of Rules", he explores being "about something" in the ordinary use of language. The legal practitioner weaves a relationship between language and the world, which can be either the path pursued by our language or the one evoked by our mental states. He addresses numerous cognitive obstacles, the necessarily relative perspective (Parallaxe), the role of comparative law, and the role of society and social norms. In short, the author aims to reveal how society and its legal norms are constructed.