In book 4 of the politics, Aristotle refines his classification of regimes and discusses "the middling regime,which he seems to identify as " best for most cities an most human beings". Then he go's on to sayhow to avoid revolution in various regimes, even offering the tyrant advice as to how to avoid being overthrown.
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For an easy to understand summary, I suggest you link the following article. On another note, gradesaver has a complete summary of Aristotle's politics right here, and also has an essay on the subject. Just click on the link Aristotle's Politics above.