Middle school teaching isn’t just about the curriculum. When students rotate from class to class, minutes are precious. Teachers must plan to structure a class period to everyone’s best advantage, anticipating a myriad of issues that will have to be resolved in the course of just one period. Each time they check off an item, two more appear. This chapter is devoted to that list—the small details that can make or break a program. Most of the topics apply not just to safety in science activities but also to safe teaching practices in general.