A better way to deal with disruptive students in middle and high school. Print these out on quarter- or half- sheets and hand them to students who are off-task or disruptive. Or laminate a few and have dry- or wet-erase markers on hand.
The ultimate site for understanding Positive Behavioral Interventions and Supports (PBIS). Sources for teachers and parents both. Plenty of resources are provided for understanding PBIS and effectively putting it to use.