The Order of the Arrow was founded by Dr. E. Urner Goodman and Carroll A. Edson in 1915 at the Treasure Island Camp of the Philadelphia Council, Boy Scouts of America. It became an official program experiment in 1922 and was approved as part of the Scouting program in 1934.
1 The manual's fourth edition recognizes the disorder as attention deficit hyperactivity disorder, with three subgroups. Â·. 2  1996. 3  The second drug to treat ADHD symptoms, Adderall (dextroamphetamine and amphetamine) is approved by the FDA.
The term 'mental retardation' was introduced by the American Association on Mental Retardation in 1961 and soon afterwards was adopted by the American Psychiatric Association (APA) in its Diagnostic and Statistical Manual for Mental Disorders (DSM-5).