This essay develops a comparison between the two versions of the Kantian deduction of the pure concepts of the understanding as present in the first (1781) and second (1787) editions of KrV. Emphasis is stressed on the discrepancies between the two versions of the objective deduction, that is, the one which demonstrates that the categories are conditions of possibility of the objects of experience.
Transcendental deduction; understanding; categories; imagination; sensibility