Our school is adopting the PBIS model next year. I'm totally on board with the idea. But I'm really wondering how you stay positive in the following two situations. First one: A student does something really egregious like draws on the wall, writes in a book, etc. Second one: Student does something not so egregious, but something which it's very, very, very important that they not do. Best example: Talking to a neighbor during a test and compromising the integrity of the test. How does a "positive classroom" work in these situations?