Abstract
Introduction Increasing numbers of children who behave in a defiant and aggressive way are being excluded from school. Outside school the victims of these children's aggression have included young children and elderly people. At the extreme, two children recently convicted of murder in England were only 10 years old. Often these children are portrayed as inexplicably “evil” or “possessed.” In fact a great deal is known about the factors leading to such behaviour, and how to prevent it.1

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