Aristotle's approach to Homer and statesmanship was different from Plato's. Politics and Poetry were two of his research topics. His theoretical treatise, "Politics" is not a presentation, like Plato's, of an ideal state according to some philosophy, but is a presentation and classification of real states as they were then, discovered by research. Similarly, Homer does not play a role in any censorial evaluation of Aristotle as a critic, but appears in a professional study of poetry, the "Poetics", with regard to the difficulty with some of his language. Aristotle's main study of Homer did not survive. It is listed in Diogenes Laërtius' "Life of Aristotle" as "Six books of Homeric problems".