My children's school anti bullying policy defines bullying as something that only happens over a period of time and cannot be a one off incident. I don't find this helpful and over the years, I think this has confused my children and made them feel that one off incidents are somehow less serious. My son was seriously beaten up on two occasions but didn't see that as bullying and it wasn't treated as bullying. Just wondering why it is necessary to make this distinction and what other views are.