Knowing who an author's is may you determine his or her purpose for writing

Audience. knowing WHO the author is writing for often gives you better context and understanding of their purpose; for example, if you take into account like children's books, you see that a lot of them have specific morals or lessons behind them to help a child develop good character. if you misinterpreted a children's book to be for an adult, you wouldn't understand the author's purpose as well because you're trying to figure out how a lesson for children could apply to an adult.