@ellythomas : Sometimes I have had the same issues. I can usually just stop the lecture and the disruptive students will stop.Or move over to the area and then stop the lecture. When the students hear me stop lecturing they know and I remind them it's there time away from lab. When I have too stop lecturing. And lab work must be completed to continue. This usually works then If needed I give a down grade for unprofesional behavior to 7,now this has there attention. I then work a deal into this that I can remove some if they can behave for the remainder of course and if not, the grade stays. I have yet had to leave them at 7.
