General Theory of Constitutions and Citizenship[Plato.Stqnford.edu] Aristotle states that "the politician and lawgiver is wholly occupied with the city-state, and the constitution is a certain way of organizing those who inhabit the city-state" (III.1.1274b36-8). His general theory of constitutions is set forth in Politics III. He begins with a definition of the citizen (politês), since the city-state is by nature a collective entity, a multitude of citizens. Citizens are distinguished from other inhabitants, such as resident aliens and slaves; and even children and seniors are not unqualified citizens (nor are most ordinary workers). After further analysis he defines the citizen as a person who has the right (exousia) to participate in deliberative or judicial office (1275b18‐21). In Athens, for example, citizens had the right to attend the assembly, the council, and other bodies, or to sit on juries. The Athenian system differed from a modern representative democracy in that the citizens were more directly involved in governing. Although full citizenship tended to be restricted in the Greek city-states (with women, slaves, foreigners, and some others excluded), the citizens were more deeply enfranchised than in modern representative democracies because they were more directly involved in governing. This is reflected in Aristotle's definition of the citizen (without qualification). Further, he defines the city-state (in the unqualified sense) as a multitude of such citizens which is adequate for a self-sufficient life (1275b20-21).
Aristotle defines the constitution (politeia) as a way of organizing the offices of the city-state, particularly the sovereign office (III.6.1278b8‐10; cf. IV.1.1289a15‐18). The constitution thus defines the governing body, which takes different forms: for example, in a democracy it is the people, and in an oligarchy it is a select few (the wealthy or well born). Before attempting to distinguish and evaluate various constitutions Aristotle considers two questions. First, why does a city-state come into being? He recalls the thesis, defended in Politics I.2, that human beings are by nature political animals, who naturally want to live together.