A group of twelve pupils from an emotional and behavioural difficulties (EBD) school were transferred to a mainstream comprehensive school. They were supported by a specialist teacher and two Educational Support Assistants. The behaviour of the pupils was monitored. The behaviour of the EBD pupils was found to be very similar to that of the other pupils in the school. Only two of the EBD boys showed behaviour significantly worse than their peers. On the whole, the EBD pupils behaved extremely well in well-run classes, but their behaviour deteriorated in less well-organised lessons. Their behaviour tended to decline over the course of the school day, and the behaviour of all the pupils in the school was shown to be worse for the last period of the day. The implications of this research on the whole concept of EBD is discussed, as is the role, attitudes and practice of both teachers and educational psychologists. (Contains 7 tables.)