Jensen wrote:
Somewhere I read, that the difficulty distinguishing the subtypes (many overlaps) made scientific results unreliable, so it was decided, in order to give it all akind of a new start, to regard it all as a spectrum of the same disorder and name severity by number, - aspergers being level 1.
Hmm, I'm aware of the issues distinguishing between the diagnoses and how they were given inconsistently, because the DSM stated that as their reasoning for the changes in the DSM-5. I know that AS and HFA are often considered equivalent to the diagnosis of ASD level 1 under the DSM-5.
Was it a recent article? As far as I know, the DSM and ICD are the only manuals used for ASD diagnoses and as ASPartOfMe mentioned, ICD-11 won't be out until 2017 and they still seem to be debating whether they're going to keep AS as a diagnosis.