Dealing with the source will have a more long-term effect in addition to dealing with the here and now situation. Secondly, identifying triggers to the aggression can help the adult head off a problem before it starts. Probably the most important part of handling an aggressive incident is to keep calm. Children need role models of adults who are able to handle their own feelings. It gives the child a sense of security to know that even though he may be out of control, the adult can maintain his own self control.
Many children respond to a soothing touch, but others just get more upset.
Know what works with each child. If you use a time out method, do not refer to it as a punishment, but as a useful tool to help a person cool off. Model to the child that you use time out yourself when you feel stress coming on. Help a child find words to express his feelings rather than using his fists. After an aggressive incident ask the child to think of as many ways as he can of what he could do differently if the circumstances were repeated.