Autism Spectrum Disorder vs. Asperger’s: What Has Changed, and What It Means for Your Child

Written by Reshani Satharasinghe, Clinical Director of Autism Partnership Singapore

Over the years, I have met many parents who come to me with the same question: “What is the difference between Autistic Disorder and Asperger’s Syndrome?”

Some parents tell me their child was diagnosed with Asperger’s, not autism. Others hear from friends or online sources that Asperger’s is milder and wonder whether their child truly needs intervention — or whether Applied Behavior Analysis (ABA) is necessary at all.

This confusion is completely understandable. The terminology around autism has changed significantly over the past decade, and many websites still use outdated language. I hope this article provides clarity and helps parents make informed decisions about support and treatment.

Asperger’s Disorder and Autistic Disorder Were Separate Diagnoses

The Diagnostic and Statistical Manual (DSM) is commonly used by healthcare professionals worldwide to classify disorders using specific, standardized criteria.

In the previous version of the DSM (DSM-IV-TR), Asperger’s Syndrome and Autistic Disorder were considered separate diagnoses within a broader classification known as Pervasive Developmental Disorders.

Below is a simplified comparison of the diagnostic criteria:

Asperger’s Syndrome	Autism Disorder
Restricted/repetitive behavior and interest	Restricted/repetitive behavior and interest
No language delay before age of 3	Significant delays in language (e.g., no single words by age 2, no phrases by age 3)
No intellectual impairment	Often accompanied by intellectual disability (though not always)

Because children with Asperger’s often had stronger language and cognitive skills, many people believed it represented a milder form of autism. However, in clinical practice, this distinction was often misleading.

Clinicians often found that this group of children STILL struggled significantly with social understanding, peer relationships, flexibility and emotional regulation. In spite of having good language skills, children with “Asperger’s” often displayed significant behavioural issues and required intensive intervention in order to address these issues.

DSM-IV Diagnostic Criteria for Asperger’s Disorder

DSM-IV Criteria for a Diagnosis of Autism

Why Asperger’s Is No Longer a Diagnosis

In 2013, the diagnostic system changed. Instead of separating autism into different categories, the term Autism Spectrum Disorder (ASD) was introduced in the DSM-5.

This change occurred for several key reasons:

Clinicians could not consistently distinguish between Asperger’s and high-functioning Autistic Disorder.
Research demonstrated that autism is a spectrum of traits, with strengths and challenges that vary tremendously across individuals. Separating it into subtypes was misleading and didn’t accurately predict needs or outcomes.
The older labels did not clarify what type of support a child really needed. There was a risk that parents might misinterpret or misunderstand that an Asperger’s diagnosis meant their child did not require treatment or support.

Today, a child who would have previously been diagnosed with Asperger’s would likely receive a diagnosis of Autism Spectrum Disorder (ASD). It is important to understand that this change does not mean the child’s challenges have changed. It simply reflects a more accurate and useful way of understanding autism.

DSM-5 Fact Sheets

Why Parents Still Hear the Term “Asperger’s”

Many adults still identify with the term because it was the diagnosis they received when they were young. Furthermore, some countries and older online articles continue to use it. This is why parents still come across the term and wonder whether ASD and Asperger’s are different.

Clinically, however, ASD is now the accepted and updated terminology worldwide.

What Parents Need to Know

Regardless of the name—ASD or Asperger’s—what truly matters is comprehending your child’s unique strengths and challenges. A diagnosis should never limit expectations. Instead, it helps us identify which skills to teach and how to support your child more effectively.

In my experience, I have seen many children make remarkable growth and progress when they received consistent, individualised ABA intervention. The challenges they faced were much more complex compared to what parents initially thought. Every child’s programme needs to be well thought out and individualised, to help them navigate the complexities of the social world.

By teaching them to manage the challenges they face and build the skillsets they need to participate meaningfully in daily life, they will then have the potential to form meaningful friendships.

At the heart of any intervention model, especially the AP Method™, holds hope that every child can progress when support is tailored, purposeful, and developmentally informed.

Reshani Satharasinghe (M.Sc., ABA-AP)
BCBA, Clinical Director

References:
The American Psychiatric Association’s
CDC – Clinical Testing and Diagnosis for Autism Spectrum Disorder