Originally published in 1990. This book discusses in a philosophically responsible and illuminating way the progress of the dialogue and its separate sections to improve our understanding of Plato's work on Theaetetus. An early coverage of this dialogue, this investigation predated a surge in study of Plato's piece which examined Socratic and pre-Socratic thought. The author's argument is that the Theaetetus engages in re-evaluation of earlier doctrines of middle-period Platonism as well as reaffirming theories about knowledge. An important work in Platonic studies and epistemology.