@futurebird That does sound frustrating, especially if you have a good flow with the lesson and then have to stop suddenly. I'm not a school teacher, but I mentor a robotics team, and we always code in pairs with one student "driving" and the other just observing for errors. It means we stop less for small silly things like typos, but also enforces the idea that there *will* be errors, it's just how coding works. I'll say, "it takes four eyeballs," and then they don't feel too bad about messing up. Usually then the students can check in with their partner first if something is wrong, and not just immediately call an adult over. I don't know how this would translate to a classroom setting though, might get loud.