This is the first edition (there is an updated one) of a graded thesaurus and advice for authors, teachers, and anyone else who wants to write for children. The main part is a thesaurus where you can look up a word you want to use. You will find the grade where it is introduced into reading in the U.S. along with alternatives with the grades where they are used. At least as useful is the information such as how long sentences are ideally at different grades and what subjects are taboo. I will note that tech words like internet are dropped down one year earlier in the second edition and the authors have added national benchmarks and subject matter in the newer edition.