 The distinction between propositional and manifestational revelation is very general, and a more fine-grained classification of conceivable means of revelation is desirable. We have already seen that propositional (or non-manifestational) revelation can be subdivided into “the causation model” and “the communication model”. Beyond this, the theologian Avery Dulles has suggested a typology useful for categorizing theories of manifestational revelation. He divides contemporary theological accounts of revelation into five major classes depending on “their central vision of how and where revelation occurs” (Dulles 1992: 27). Besides propositional revelation (which he calls “Revelation as Doctrine”), Dulles discerns four basic models for manifestational revelation.