Pure reason is mainly inspired by the Critique of Pure Reason and the Critique of Practical Reason. She looks for the different epistemological leaps and falls that Kant explicitly or implicitly manifested throughout his research. Pure reason therefore implies understanding, theoretical reason and practical reason. In this book, it is not simply a question of talking about this pure reason, but of providing an epistemological instrument that can help any researcher to develop his own epistemological approach, or to learn to philosophize!