The present volume deals with the problem of the application of transcendental philosophy to practical philosophy. In honour of Marco Ivaldo, some of the leading experts on Fichte have teamed up to treat the subject diachronically. From Kant to contemporary philosophy, some of the main philosophical positions (Kant, Fichte, Hegel, Husserl, Deleuze, and many others) are examined in view of their compatibility with the transcendental-philosophical approach in a practical way.