Are you spending as much class time squelching skirmishes and fighting for students' attention as you are on fractions and essays? The book Rules in School can help you regain instructional time by developing class rules and consequences for infractions at the start of the year.
This ariticle states that setting up rules for computer usage ahead of time helps to eliminate problems later. A lot of good suggestions that should start at a young age and continue to reinforce throughtout their schooling.
Ask some principals to identify the most difficult part of their day, and it will be recess, a time when fights and visits to the nurse's office skyrocket. But before you decide to eliminate this important opportunity for physical activity, consider the causes of the chaos.
This site provided by the University of Nebraska at Omaha and several partner organizations promotes learning about the brain and nervous system for children.