The clinical utility of parent and teacher rating of Attention Deficit Hyperactivity Disorder (ADHD) symptoms was studied by Receiver Operating Cuwe Analysis. The sample comprised 124 subjects with ages between 4 and 12 years old (62 children with Learning disorders or ADHD and 62 controls, paired by sex and age). The results show that teacher and parent ratings permit un accurate classification of subjects in a control or clinical group. Cut-off points for parent and teacher ratings were established for the DSM-IVA DHD symptoms checklist and the attention profiles from Achenbach's CBCL and TRF.