LinCO - both developmental paeds we have discussed our DDs ADD with consider CAPD to be real, but a symptom of ADD and not an independent disorder. At the very least they are very commonly co-morbid, as are dyslexia, dysgraphia, dyspraxia, etc. And certainly I have spoken to numerous parents of gifted kids with ADD whose CAPD symptoms just disappeared with medication for the ADD. Likewise dramatic improvements in handwriting and general motor planning.