In Little Kitty, the fifth and final book in the series, the difficulty level increases as there is an overall lower number of total words with the highest number of unique words. Being the hardest book in the series, it has the least repetitive and predictable phrase structure and has no within-text supports. In other words, the overall repetition and predictability decreases in this book along with a corresponding increase in the complexity of words and sentence structure. In this book, the difficulty level of the sight words rises as this book has the most unique common kindergarten, first grade, and second grade sight words. This book contains the highest number of total first and second grade sight words. Lastly, this book also introduces a semicolon as punctuation.
The developmental skills highlighted in this book are developing a more advanced vocabulary for verbs and descriptive language. The words in this book are the most challenging to read with the most dynamic sentence structure. This book introduces longer sentences as well as the introduction of longer combined phrases within sentence structure.