Asperger Syndrome (AS) is believed to be first described as ‘autistic psychopathy’ in German by Hans Asperger.^{[1]_SpringerLink-2|[2]} He distinguished his cases from autism which later became known as ‘Asperger’s Syndrome’.^[3] In 1981, Lorna Wing published Asperger’s works in English.^[4] In 1994, DSM-4 classified Asperger Syndrome (AS) as a subtype in the category of pervasive developmental disorders (PDD). In 2013, DSM-5 combined 4 of the 5 subtypes of pervasive developmental disorders (PDD) under the Autism Spectrum Disorder (ASD) category.^[5]

• In 1938, Hans Asperger described ‘autistic psychopaths’ in German.^[1]
• In 1943, Leo Kanner described 11 cases with ‘infantile autism’ in his paper.^[6]
• In 1944, Hans Asperger, described four children with ‘autistic psychopathy’ in his thesis.^{_SpringerLink-2|[2]}
• Asperger used the term ‘autistic psychopathy’ to describe the cases in his studies and distinguished them from autism, which later were became known as ‘Asperger’s Syndrome’.^[3] 
• In 1981, Lorna Wing published Asperger’s works in English (translated from German).^[4]
• In 1991, Uta Frith translated Asperger’s thesis into English. Frith, Uta (1991). Autism and Asperger syndrome. Cambridge New York: Cambridge University Press. ISBN 978-0521386081.
• In 1994, DSM-4 classified Asperger Syndrome (AS) as a subtype in the category of pervasive developmental disorders (PDD).
• In 2013, DSM-5 combined 4 of the 5 subtypes of pervasive developmental disorders (PDD) under the Autism Spectrum Disorder (ASD) category.^[5]

Template:Pervasive developmental disorders