Prolegomena to Any Future Metaphysics That Will Be Able to Present Itself as a Science (German: Prolegomena zu einer jeden k nftigen Metaphysik, die als Wissenschaft wird auftreten k nnen) is a book by the German philosopher Immanuel Kant, published in 1783, two years after the first edition of his Critique of Pure Reason. One of Kant's shorter works, it contains a summary of the Critique's main conclusions, sometimes by arguments Kant had not used in the Critique. Kant characterizes his more accessible approach here as an "analytic" one, as opposed to the Critique's "synthetic" examination of successive faculties of the mind and their principles. The book is also intended as a polemic. Kant was disappointed by the poor reception of the Critique of Pure Reason, and here he repeatedly emphasizes the importance of its critical project for the very existence of metaphysics as a science. The final appendix contains a detailed rebuttal to an unfavorable review of the Critique.