Friendly banter and spontaneous discussion between co-teachers can be a useful and educational part of a team-taught class. But it’s important to ensure that the instructors stay on schedule and on-topic. This can be done by setting a few ground rules between co-teachers: When is it OK to interrupt each other, and when is it better to take turns speaking? How will you handle the situation when your interaction with your co-teacher clouds the main points you want your students to learn? What can you do when your co-teacher’s feedback contradicts your own? How will you grade your students with a single voice?