2
1 Transition from the common rational knowledge of morality to the philosophical
3
2 Transition from popular moral philosophy to the metaphysic of morals, part 1
4
3 Transition from popular moral philosophy to the metaphysic of morals, part 2
5
4 Transition from popular moral philosophy to the metaphysic of morals, part 3
6
5 Final step from the metaphysic of morals to the critique of the pure practical reason