If the child is upset, let him calm down and ask him to draw it out for you or tell a story of what happened. Also, work with the professionals so you can learn to work with the behavior. Overall, you can’t give one specific technique for each case; it is a matter of getting a whole toolbox of different types of techniques and seeing which one they respond to best.
David Wolffe, author of Peace: The Other Side of Anger—Helping Teens with Anger Management, is certified as a peer mediation specialist from the International Center for Conflict Resolution of Columbia University Teachers College. He founded P.E.A.C.E., Inc. to help teens express anger and manage conflict in positive ways.