S.B.
I was a member of a co-op preschool for 4 years and they had great ideas for conflict resolution. It is important for him to learn the impact his actions have on others. It sounds so simple but saying something like "It hurts Brians skin when you pinch him" or "look at Holly, she is crying because you pushed her" can go far in helping him to understand others. If say, he is angry because he is not being heard,saying to him "you are/were angry because so and so isn't listening to you" can let him know he is being heard.I know it can sound silly but kids act out strongly if they don't feel heard. Imagine HIS frustration. Also I always make sure to say "it is NOT okay to hurt our friends.You need to use your words", and then role play scenarios w/him where he can use his verbal rather than physical.