The Key Words reading scheme is scientifically researched and world renowned. In book 8b, Peter and Jane's family look after a friend's house in 91 new words including ' sunny', 'private', 'room' and 'dressing'. Once this book has been completed, the child moves on to book 9b. The Key Words with Peter and Jane books work because each of the key words is introduced gradually and repeated frequently. This builds confidence in children when they recognise these key words on sight (also known as the 'look and say' method of learning). Examples of key words are: the, one, two, he.