Kant's Revolutionary Theory of Modality is a comprehensive study of Immanuel Kant's views on modal notions of possibility, actuality or existence, and necessity. Abaci locates Kant's views on these notions in their broader historical context, establishes their continuity and transformation across Kant's precritical and critical texts, and determines their role in the substance as well as the development of Kant's philosophical project. He makes two overarching claims. First, Kant's precritical views on modality, which appear in the context of his attempts to revise the ontological argument...