Socrates and Io are already talking at cross-purposes. Socrates appears to want to talk about the rhapsode's ability (as part of his techne) to understand the intent (dianoia) of a poet, while Io states that it is the hardest part of the techne to perfect the expression of the intents (dianoiai) of a poet. Io is motivated to present the poems as beautifully as possible, not as informatively as possible.