The Cracking the ABC Code Learn to Read series, consisting of 20 books, has been designed to help children develop decoding and fluency skills. Each book uses decodable content words which children can read using their phonic knowledge. It is expected that children using the Learn to Read series already have a good grasp of the alphabet and can easily blend these sounds into words (e.g., can, fun). Each book focuses on a different digraph (e.g., ch, sh, th) and the introduction of these digraphs match the Cracking the ABC Code Multisensory Reading Level 2 books. Again, this knowledge is cumulative in that once a digraph has been introduced words containing those digraphs will continue to be used in subsequent books.
In addition, the books introduce children to 200 high frequency words, representing 70% of our everyday language. These high frequency words may or may not be words that children can decode given their current phonic knowledge, but are words that are frequently used and consequently important to learn in order to achieve reading fluency. The words are introduced in sets of 20 with the same key words used in different sentence structures multiple times throughout two consecutive books (e.g., Books 1 & 2, Books 3 & 4, etc). Once high frequency words have been introduced, they are continually used throughout the series.