Author's Purpose - Easy as PIE!

In reading class a couple of weeks ago, we focused on the "Text Element" AUTHOR'S PURPOSE.  We learned that an author generally has 3 reasons for writing: To Persuade (talk us into something or convince), To Inform (to teach or tell us something), and To Entertain (to allow us to have fun while we're reading).  We figured out that the story in our reading books (My Brother Martin) was written to INFORM of us of Martin Luther King, Jr's early life (and what maybe motivated him to become such an advocate for African-Americans' rights).  We did a couple of activities to learn more about this skill (Author's Purpose), including making "pie plates" where we cut out examples of books (from book orders) that we thought "demonstrated" each of the three reasons.