Key Words with Peter and Jane uses the most frequently met words in the English language as a starting point for learning to read successfully and confidently. The Key Words reading scheme is scientifically researched and world renowned. In book 4b, Peter and Jane meet the animals at a farm in 41 new words including, 'work', 'thanks', 'stop' and 'horses'. Once this book has been completed, the child moves on to book 4c.