There is a general lack of consensus as to which executive functioning aspects are problematic in ASD specifically. Symptoms overlap with other disorders, so the source isn’t clear. It cannot be proven if executive dysfunction is the root of ASD symptoms as opposed to a symptom in itself. These difficulties are also not entirely universal, appearing to be affected by IQ and age, with some executive functions more difficult to others. Measurements are imperfect and may be affected by other factors. Perhaps its greatest potential is as an endophenotype.