Realizing that behavior that is acceptable at one time may drive us to distraction at another, we must nevertheless aim for consistency in setting and maintaining limits. Involve the children in setting some simple class rules - 3 to 5 at most. Be consistent in reminding children of their rules. Convey your expectations to the children often, using a variety of techniques. This is a technique that focuses on what the child is doing well, understanding that positive attention tends to increase the chances of the child learning the behavior.
Praise is the most common form of positive reinforcement.
Lisa is sitting like a pretzel. I'm so proud of your helping to clean up. Let's work to clean up. I'll help too. You're so nice Alana.