The distinctive feature of the Trattato teorico-pratico di diritto penale must be found in the objective that it proposes: explain the correlation between the applied problems (the practice) of the criminal law and the reasons (the theory) at the base of their solutions, on the basis of Kant's motto " this may be true in theory but it does not apply in practice" (and vice versa). In addressing the professionals as its natural recipients or at least the main, the essay deliberately directs this dialectic to the praxis. In the analysis of individual institutions or criminal offenses, the compass is therefore made up of the issues that arise in the application of the criminal rule; the main purpose is to investigate the aporias and the critical points reported as a priority by the case-law practice clarifying the genesis and assumptions of resolution. Without forgetting, of course, the need to provide a clear picture of the state of the art and of the hermeneutical outcomes consolidated in every single sector of the criminal territory “intra codicem” and relevant to some complementary regulations of particular importance. Moving from a dynamic conception of the legal-criminal experience, the treaty wishes to provide a guide, conveying the meaning that the criminal standard (general or special part) assumes in the judicial field. In the basic belief that one of the possible antidotes to the crisis of the traditional criminal law, determined by the increasing social complexity, is represented by a greater critical awareness of the reasons and operational rules that govern the formation of the Courts’ guidelines.