To assess the effects of modified relaxation training on subsequent disruptive behaviour, two groups of six non-institutionalized mentally handicapped adults were compared. At the end of 3 weeks training, those given relaxation training showed 71% more relaxation after relaxation sessions and 74% less disruptive behaviour later in the day, whereas controls who were only told stories showed no decrease; aggression and verbal disruption showed the most consistent effects. This suggests that modified relaxation is rapidly effective in inducing relaxation and in reducing disruption.