In the previous diagnostic manual DSM-IV, selective mutism was included in the chapter on other disorders in toddlers, children and adolescents. In the new manual DSM-5, SM was instead included among anxiety disorders. This new categorisation of the diagnosis highlights an increased focus on underlying social anxiety problems. In clinical groups, children with SM are often described as anxious, shy, sensitive, clingy and needy. On the other hand, there are also accounts of children with SM being passive-aggressive, stubborn, oppositional and controlling (Dummit, Klein, Tancer, 1997).