Hi, my good friend has 2 boys who came to stay. They seemed to use screaming as a way of communicating and I would dash upstairs thinking that someone had been murdered, fatally wounded ... etc ... etc. They were much improved when I gave them a couple of examples when screaming was GOOD AND NECESSARY and like the boy who cried wolf if they used daily screaming the real screams would be ingnored. Simple but it worked ... meanwhile I have my own dire problem with 10 year old who refuses to go to her room for 10 minutes having thumped her sister in the car, thrown all school bags across wooden floor scratching it and then smashed a hairbrush!! Good luck!!