A school-teacher friend recommended these books to me, so, knowing she is great teacher/mother I was anxious to grab one and see how my son liked it. Well, he has flown through it! I love the repitition of the book, but its almost not challenging enough for him. However, for the sake of building a good foundation, not wanting to rush him and since he did just turn 4 in March I will order the books in order. My son loves being able to work in his "new school book" and enjoy's knowing he can do it on his own although we work together on it. I will continue to use these book while building a great foundation in reading!