Once Upon a Time is a series of ten workbooks, designed for the K-2 beginning reader. In order of difficulty they are: The Three Bears, The Three Billy Goats Gruff, The Three Little Pigs, The Gingerbread Man, The Little Red Hen, The Boy Who Cried Wolf, The Elves and the Shoemaker, Jack and the Beanstalk, Chicken Licken, and Little Red Riding Hood.