Plato also gives another example of the limited nature and scope of the poets knowledge of truth. He says that there are three skills- that of the user, of the manufacturer, and of the artist. While the user has the greatest practical knowledge, the manufacturer gains this knowledge because he has to produce the article to the satisfaction of the user. The artist has neither the knowledge of the user nor of the manufacturer. He can neither make the article nor use it and therefore does not understand it. Thus while the user and the manufacturer can serve the society, the poet cannot.