A: ADD (Attention Deficit Disorder) was a term formerly used to designate Attention
Deficit Disorder (ADD) distinct from Attention Deficit Disorder Hyperactivity Disorder (ADHD). Sometimes AD/HD will still be referred to in a shorthand fashion as “ADD”.
The terms ADD and ADHD have been replaced in the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) by the single term AD/HD. AD/HD as currently viewed is comprised of three sub-variants. One of these is AD/HD with predominantly inattention. This sub-variant is what was previously simply called “ADD”.