In most schools, there is a buffer between classes. First bell rings, which means the period is over and you walk to your next class. There is a 2- to 3-minute window in which to travel. Second bell rings, which means no more walking, no more talking, you’re in your seat and the next period has begun.
In Namibia, one bell rings and one bell only. So there’s no way to determine if a student is late.
Worse still, the bell is hand-controlled, so if the secretary is busy or not around, the bell just doesn’t get rung. That means I could have prepared my lesson and timed it exactly so that it’s finished in 40 minutes…but all of a sudden I have seven extra minutes on my hands and I’m wondering what to do with 35 kids.
Seven unplanned minutes with 35 kids is a lot.
Here is what it looks like for students to meander on to the next class. I do sorely miss the fastidious schedules of most American schools:

































