There are many reasons why discipline can be a problem in your classroom. One of the reasons could be your teaching style. If you aren't reaching every one of your students, they can become bored, disinterested and restless. As mentioned in the section on instruction, every student has their own learning style and an area where they excel.
D.O stands for Doctor of Osteopathic medicine. Dr. Still developed osteopathic medicine in 1874. He believed that every illness has a cause and every cause has a location. You find the location to make one healthy.
Most of us are familiar with the medical designation MD (or Doctor of Medicine) which we have seen countless times on office doors, medical directories, and even TV shows like Marcus Welby, MD, Trapper John, MD, and Doogie Howser, MD. A designation that you may be less familiar with is DO (or Doctor of Osteopathic Medicine).