I use a classroom “Red-Yellow-Green Light” which is used as a behavior chart for each child. If a student does not make good choices they will be asked to change their color. A “Code of Conduct” explaining why your child was asked to move his color will be sent home and should be signed and returned to me the following day.
Also in my classroom I use a ticket reward system. Students who are on task and completing their work, go above and beyond what is expected of them or is caught being nice or doing a helpful deed will receive a ticket. Once they have received ten tickets they are allowed to pick a prize from the treasure chest.