Aristotle rarely sets down hard and fast rules in the practical sciences because those fields are naturally inclined to a degree of vagueness. Aristotle is generally credited with being the first thinker to recognize that knowledge is compartmentalized. For example, he recognizes that the practical sciences, such as ethics or politics, are far less precise in their methods and procedures than, say, logic. This is not a failure of ethics and politics to live up to some ideal, but rather just the nature of the beast. Ethics and politics deal with people, and people are quite variable in their behavior. In the Politics, Aristotle seems to waver in determining what kind of constitution is best, but this is not so much ambiguity on his part as a recognition that there is no single best constitution. A thriving democracy relies on an educated and unselfish population, and failing that, another form of government might be preferable. Similarly, in Nicomachean Ethics, Aristotle does not lay down any hard and fast rules regarding virtue because different behaviors are virtuous in different situations. The vagueness of Aristotle’s recommendations regarding the practical sciences are then a part and parcel of his general view that different forms of study require different approaches.