 In fact, it remains a matter of dispute whether the division of Plato’s works into three periods—early, middle, late—does correctly indicate the order of composition, and whether it is a useful tool for the understanding of his thought (See Cooper 1997, vii–xxvii). Of course, it would be wildly implausible to suppose that Plato’s writing career began with such complex works as Laws, Parmenides, Phaedrus, or Republic. In light of widely accepted assumptions about how most philosophical minds develop, it is likely that when Plato started writing philosophical works some of the shorter and simpler dialogues were the ones he composed: Laches, or Crito, or Ion (for example). (Similarly, Apology does not advance a complex philosophical agenda or presuppose an earlier body of work; so that too is likely to have been composed near the beginning of Plato’s writing career.) Even so, there is no good reason to eliminate the hypothesis that throughout much of his life Plato devoted himself to writing two sorts of dialogues at the same time, moving back and forth between them as he aged: on the one hand, introductory works whose primary purpose is to show readers the difficulty of apparently simple philosophical problems, and thereby to rid them of their pretensions and false beliefs; and on the other hand, works filled with more substantive philosophical theories supported by elaborate argumentation. Moreover, one could point to features of many of the “Socratic” dialogues that would justify putting them in the latter category, even though the argumentation does not concern metaphysics or methodology or invoke mathematics—Gorgias, Protagoras, Lysis, Euthydemus, Hippias Major among them.