 Aristotle ends this chapter by saying that practical wisdom belongs to the second part of the rational soul, i.e., the part whose object is what is contingent. Its virtue is the ability to form opinion (doxa) with respect to what is contingent (1140a1–1140b30). Of course, craft also belongs to this part of the rational soul. So, it appears that both of these intellectual virtues, which deal with contingent reality, form (scil. true) opinions. In the case of technê, the opinions are the basis for production; and in the case of phronêsis, the opinions are the basis for living well. By making explicit the role of opinion in dealing with contingent reality, Aristotle has marked the fundamental difference between epistêmê, as scientific knowledge, and technê.