Gwendolyn, there are times when a student is taking so much of the attention of the class that some level of immediate action is necessary. The goal is to have the least negative impact on all parties as possible. We want our overall classroom to move forward while allowing the unruly student to understand the impact they are having on the class. Another good technique that can be used is to let the student know you understand they seem confused about the subject matter and thus are acting out in class which is not the correct method of seeking help so please plan on meeting with me after class so I may better assist you. This gives the student an easy way out, lets them know you are unhappy with their behavior and allowing the rest of the class to continue on with the lesson plan.
James Jackson