"'Saturday 14th August 2001: Today has been a horrible, hateful day. Daniel has pushed me to my absolute wits' end. Sometimes it really does feel like he is the original child from hell.' For Alison, life with her son Daniel sometimes seemed like an endless torrent of disobedience, backchat, rudeness, name-calling and aggression. Upon starting school, where his aggression and lack of concentration concerned teachers, Daniel was given a vague diagnosis...