"You might want to think in terms of how the Corellian system works, at least initially," Leia offered. "The Senate here is broken into solar systems of planets. Each Senator represents million or billions of beings, which might be a bit large-scale for you at such an early stage. The Corellian system is unusual--it has three distinct and sentient species, and five planets capable of sustaining life. Each planet elects a leader, then those five decide on a prime minister for the system."