A range of 36 books, over 12 levels, the series focuses on gradually introducing and repeating the most widely-used words first, to help children read quickly and easily. 

The purpose of the Key Words series is to introduce the 2000 “key words” most commonly used in English to readers, and to apply these key words to sentence-type articles.

The collection has 36 books in the set. Each book encourages the young children to have a grip of “keywords” in the English language, in a fun and exciting way.