This book consists of a selection of papers which throw new light on old problems in one of Plato's most difficult dialogues. The papers included fall into three broad categories: a) those dealing directly with the ostensible aim of the dialogue, the various definitions of a sophist from different perspectives (T. Robinson, F. Casadesus, J. Monserrat-P. Sandoval, A. Bernabe, M. Narcy and K. Dorter; b) a number which tackle a specific question brought up in the dialogue, and that is, how Plato relates to Heraclitus and to Parmenides in the matter of his understanding of being and non-being...