This study examined parental and professional beliefs about the efficacy of various treatment strategies forADHD. Method: Parents of children with and without ADHD and seven medical and nonmedical professional groups (N = 673)completed a questionnaire examining their beliefs about the efficacy of various treatment regimes. Results: Principlecomponent analysis identified four factors'school-based interventions, medical and allied health interventions, parentinterventions, and nontraditional interventions. Although there were some group differences in the level of endorsementfor these factors, there was a high degree of concordance between the groups. The school-based interventions factor wasthe most highly endorsed, whereas the nontraditional interventions factor was the least endorsed by the sample as a whole.Conclusion: The results suggest that the low level of interdisciplinary interaction that has been reported in the literature isnot due to differences in beliefs about the efficacy of various treatment strategies for ADHD.