In full, Prolegomena to Any Future Metaphysics That Will Be Able to Come Forth as Science (De. Prolegomena zu einer jeder künftigen Metaphysik, die als Wissenschaft wird auftreten können). Published 1783.

This relatively short work is an explication of Immanuel Kant's much larger Critique of Pure Reason (q.v.). In it, Kant explains the principle aims and results of the Critique, as well as his methodology. The Prolegomena, intended to arouse interest in and defend against criticism the Critique, serves as a good introduction to the content, if not the proofs, of Kant's critical philosophy. The Prolegomena was published between the first (A) and second (B) editions of the Critique of Pure Reason.