My mentor teacher uses a good technique to open most lessons. He passes back old papers, tests, homeworks, etc and always begins with a recap of the night’s reading or the previous day’s lesson. He closes lessons with a brief recap and passes out new homeworks if applicable. Most notably, and I have started adopting some of these practices, during lessons he deals with interruptions/transitions very well. (These interruptions include kids needing passes to the bathroom, late arriving students, and transitioning to different segments of the lecture/discussion.) He takes the passes and without missing a beat signs them and says “zoom’ to the kids to reinforce the need to return quickly to class. Similarly, he takes tardy slips without reaction and the student simply takes a seat and enters the class at that point in the discussion. My favorite classroom management technique is simply walking around and keeping the room fluid and engaging with the students.