The title of the Politics literally means ""the things concerning the polis"" and it is considered to be the ""philosophy of human affairs"". After studying a number of real and theoretical city-states' constitutions, Aristotle classified them according to various criteria. On one side stand the true (or good) constitutions, which are considered such because they aim for the common good, and on the other side the perverted (or deviant) ones, considered such because they aim for the well being of only a part of the city.