This is a fun and useful book. For each letter of the alphabet it shows an animal that starts with that letter and teaches the reader to do the sign for that animal. The book does a decent job of showing you what to do, although in a few instances the illustrations with arrows and the written description of the sign still weren't quite enough for me to be positive I was doing it accurately. But I have almost zero knowledge of sign language, so presumably someone with more expertise would have no issues. My four-year-old really enjoyed this, although the fact that we were attempting sign language went over his head. He was more interested in inventing his own signs for the animals.