This book belongs to rich set that teaches with inspiration. It can help kids read correctly and quickly during the repetition of words and re-using it in different content. This set is divided into 4 categories. First category refers to the life cycle of a butterfly:
“Egg stage” contains simple words and limited content
“Caterpillar stage” contains short repetitive sentences.
“Cocoon stage” contains various short sentences.
“Butterfly stage” contains harder words and synonyms.
Every three stages target different levels (Beginner, Intermediate, and advanced). They vary from easiness to hard, in order to improve students in reading and understanding gradually.