Individuals with intellectual disabilities commonly engage in a variety of problematic behaviours such as aggression and self-injury. This paper discusses the value of using a communicative model to study these behaviour problems. First, the reciprocal nature of behaviour problems is outlined. Next, research on the use of functional communication training as a treatment for behaviour problems is reviewed in terms of its initial effectiveness, generalisation, and maintenance, as well as the mechanisms responsible for behaviour change. Finally, recommendations are made for future research and training efforts aimed at reducing severe behaviour problems.