 The evidence Vlastos uses varies for this claim, but is of several types: stylometric data, internal cross references, external events mentioned, differences in doctrines and methods featured, and other ancient testimony (particularly that of Aristotle). The dialogues of Plato’s Socratic period, called “elenctic dialogues” for Socrates’s preferred method of questioning, are Apology, Charmides, Crito, Euthyphro, Gorgias, Hippias Minor, Ion, Laches, Protagoras, and book 1 of the Republic. The developmentalists’ Platonic dialogues are potentially a discrete sequence, the order of which enables the analyst to separate Socrates from Plato on the basis of different periods in Plato’s intellectual evolution. Finally,