Unlike the "Critique of Pure Reason", which was written in the synthetic style, Kant wrote the "Prolegomena" using the analytical method. He divided the question regarding the possibility of metaphysics as a science into three parts. In so doing, he investigated the three problems of the possibility of pure mathematics, pure natural science, and metaphysics in general. His result allowed him to determine the bounds of pure reason and to answer the question regarding the possibility of metaphysics as a science.