Sometimes dealing with unruly or disruptive students can be very taxing and time consuming. I can usually tell after the first class who my disruptive students will be. It is often helpful to talk to these students ona one-on-one basis to try to come to some type of an understanding about these students and to try to find out why they are they are the way they are. It us often useful to give them small group projects to work on. I try to never let them take charge of a class and disrupt the class. I will pull them out and talk to them individually if need be.