@ellythomas : I would ask the students that were causing the disruption, to step outside the class for a moment and I would have a talk with them about being professional in the class, just as they would be on the job. I would let them know that there is zero tolerance for that behavior. I like to give my other students a friendly reminder that their behavior in class is a direct reflection of what kind of professional they will be. It makes them stop and think. They are in training for the real world while they are in class. Having a mix of ages makes it difficult, I know. But I do believe that the majority is there to learn, and make a better future for themselves. Perhaps a "friendly" reminder to the entire class of why they are there, and what they hope to accomplish with their new education.