Autism Spectrum Disorder (ASD) has undergone significant reclassification over time. Historically, it was divided into subtypes including Infantile Autism, Asperger’s Syndrome, Pervasive Developmental Disorder-Not Otherwise Specified (PDD-NOS), Childhood Disintegrative Disorder (CDD), and Rett Syndrome. These subtypes were recognized based on varying social, communicative, and behavioural challenges. In 2013, the DSM-5 unified these categories under a single diagnosis of ASD, reflecting a spectrum of symptoms with varying severity. This modern classification emphasizes persistent social communication deficits and restricted, repetitive behaviours, with levels indicating the required support. This shift enhances diagnostic consistency and personalized support for individuals with autism.

The DSM-5, published by the American Psychiatric Association in 2013, is an essential tool for diagnosing mental disorders, reflecting decades of evolving research since its first edition in 1952. The manual is divided into three sections: an introduction, detailed diagnostic criteria across 20 chapters, and emerging measures and models. Despite its utility, the DSM-5 has faced criticism for reducing diagnostic categories, medicalizing normal behaviours, potential pharmaceutical influence, and a lack of transparency in its revision process. Used globally, often alongside the WHO’s ICD, the DSM-5 remains a crucial yet controversial framework in mental health diagnostics.

Asperger’s Syndrome, first identified by Dr. Hans Asperger in 1944, describes individuals with normal intelligence and language development but significant social and communication challenges. British psychiatrist Dr. Lorna Wing brought Asperger’s work to global attention in the 1980s, emphasizing the unique profiles within the autism spectrum. Asperger’s Syndrome was officially recognized in diagnostic manuals in the 1990s but was merged into Autism Spectrum Disorder (ASD) in the DSM-5 in 2013. This consolidation has been controversial, with critics arguing it overlooks the specific needs of those with Asperger’s. Despite this, the legacy of Asperger and Wing continues to influence the understanding and support of autism spectrum conditions.

Autism Spectrum Disorder (ASD) is a complex developmental condition characterized by social, communication, and behavioural challenges. Initially identified in the early 20th century, ASD was distinctively described by Dr. Leo Kanner in 1943 and Dr. Hans Asperger in 1944. The understanding and diagnostic criteria of autism evolved over time, with the DSM-5 in 2013 consolidating various subtypes under the single diagnosis of ASD, emphasizing a spectrum of symptoms. Advances in genetic and neurological research have deepened understanding, while advocacy and support organizations have promoted awareness and acceptance. The neurodiversity movement and self-advocacy efforts highlight the strengths of individuals with autism, fostering greater societal acceptance and inclusion.