When asked how I keep such a well-managed classroom, my first response is that I keep my kids busy all day long. There is no down-time in my classroom. I offer no free choice, work/ homework passes, free time earned by filling a marble jar, or even a time when my students eat snack without being engaged in instruction. If you keep your students engaged in quality instruction from the beginning of the day to the end, I guarantee you will notice a difference in you classroom immediately. Behavior problems occur in classrooms when downtime is offered.
One thing my first graders will learn quick is there is always something to do in Mr. Giso's classroom. The words "I'm done" are banned from the first day of school, as there is always the next project to start. As a visual, I simply have a "What to Do When I'm Done..." sign.