In the preface to the first edition of the Critique of Pure Reason, published in 1781, Kant wrote:

However, the initial response to Kant's argument, which he also titled the “transcendental deduction of the categories” (A 85 /B 117), was largely one of incomprehension, and in the preface to the Metaphysical Foundations of Natural Science, published in 1786, Kant himself acknowledged that precisely “that part of the Critique which should have been the clearest was the most obscure, or even revolved in a circle” (4:474 n.). So in the second edition of the Critique, published the following year, Kant completely rewrote the transcendental deduction. He claimed that this revision touched only the manner of “presentation,” not the “propositions themselves and their grounds of proof” (B xxxvii-xxxviii). But in spite of Kant's efforts at clarification, the intervening two centuries have brought little agreement in the interpretation of the deduction, even on the fundamental question of whether the two editions of the Critique, in 1781 and 1787, try to answer the same question by means of the same argument. The last three decades alone have brought forth dozens of competing interpretations or “reconstructions” of Kant's transcendental deduction.