Attention Deficit Disorder with/without Hyperactivity (ADD/ADHD) is a neuro-developmental disorder that affects up to 6% of the children and the adolescents, and up to 4% of the adults in the general population. In French-speaking countries and in France more specifically, there is almost no validated instrument for the diagnosis of ADD/ADHD. Thomas E. Brown created scales to rate symptoms of ADD/ADHD from age 3 to adulthood. There are observer-rated forms (teacher and parent) and self-rated forms (adolescent and adult). Following WHO's guidelines all the forms of the BADDS were translated into French and back-translated into English. Dr Brown compared both English forms to ensure that the meaning of all items had been correctly caught. Students in Paris and children diagnosed with ADD/ADHD in Nice filled out the BADDS. Preliminary analyses are presented. A large epidemiologic study is planned to collect normative data in the French general population.