Focussing on two metaphysical doctrines of central importance to Plato's thought - the 'Theory of Forms' and the doctrine of 'Being and Becoming' - he suggests a continuous progress can be traced through Plato's works.

Focussing on two metaphysical doctrines of central importance to Plato's thought - the 'Theory of Forms' and the doctrine of 'Being and Becoming' - he suggests a continuous progress can be traced through Plato's works.