Aristotle did not agree with Plato’s ideas about an ideal government. Instead, he believed in a government that worked for the common good through realistic means. Aristotle spent much of his time traveling to compare the constitutions of the various city-states where he identified six types of constitutions in use by the city-states of Greece at that time, and he labeled them either “true” or “despotic.” This gave Aristotle a great basis and credibility on which to claim the most desirable form of government.
What is the best attainable regime? Why?
Aristotle believes that the best attainable regime is polity, but believed the best theoretical regime is an aristocracy because it is the regime in which judges according to virtue and chooses its rulers on the basis of virtue. Aristotle recognizes that in its pure form such a standard is impossibly high, because it requires knowledge of what true virtue is, always as the ability to recognize true virtue in others. Therefore only “so-called” aristocracy is possible, and real aristocracy is unobtainable.