Intensive Interaction is a form of behavioural intervention developed by Nind and Hewett and extensively practised in schools and other institutions caring for people with profound intellectual disability who require special support in order to develop (non-verbal) interpersonal communication. Whilst the term Intensive Interaction can describe the attitude and behavioural style of staff throughout their contact with subjects, it can also, as in this study, refer to specific scheduled times in which the approach is adopted by staff with individual pupils or service users.