Purple level books include an increased proportion of longer sentences, with a more challenging vocabulary. Some Purple books have short chapters to challenge and encourage reading stamina. Purple level books include longer and more complex sentences with the inclusion of complex (i.e. ‘when’) and simple (i.e. ‘and’) connectives. Story features such as plot, character and setting are developed in more detail, and the text in the nonfiction books is presented in a variety of ways.