I obtained this book recently as I was beginning to compete with my dog; I quickly have almost worn it out. I am taking classes in AKC Rally but can only compete in APDT because my dog is an "All American" (mixed breed). So I needed to have this kind of side by side comparison of the exercises. In addition, she gives you step by step instructions for each one. Although the title mentions using a clicker, it is not necessary to use one in order to find the book useful.