An Author's Purpose PowerPoint to explain how a writer needs to Persuade, to Inform, and to Entertain. Makes it easy as P.I.E. to understand how to identify an author's purpose when reading. The slide show has engaging slides with animation. Students will learn in this lesson what to look for when determining and identifying author's purpose, determine the difference between fact and opinion, and then practice identifying the different types of authors purpose in the activity on the last slides.