EN
The paper deals with the problem of distinction between knowledge and true belief in Plato’s dialogue Theaetetus. It is focused on the part Theaet. 201a-c, where according to some commentators, Plato specified the necessary and sufficient conditions for achieving knowledge. The aim of the paper is to find out, whether talking about necessary or sufficient conditions is relevant in the wider context of the other dialogues and also in Theaetetus itself.