Self-injurious behaviour (SIB) was defined in the original study (Oliver et al., 1987) as repeated, self-inflicted, non-accidental injury producing bruising, bleeding or other temporary or permanent tissue damage, and repetitive behaviours that had the potential to do so if preventative measures were not taken. The study therefore included people whose self- injury was very clear and did not include those people who merely showed stereotyped behaviour. (1) It is included in "Conditions for further study" in DSM-V and is coded in ICD under Intentional self-harm X71-X83.