Understanding autism
The levels describe how much support someone needs, not how autistic they are. That distinction is the whole thing, and it is the part most explanations skip.
Adult Autism Assessment Perth arranges autism and ADHD assessments for adults and adolescents across Perth and WA. Here is what the levels actually describe.
The three levels were introduced in the DSM-5, the diagnostic manual published by the American Psychiatric Association, in 2013. Before that, diagnoses were split into separate labels — autistic disorder, Asperger's syndrome, PDD-NOS. Those were merged into one diagnosis, autism spectrum disorder, with a level attached to describe support needs.
That is why an adult diagnosed today may hold a "level", while an adult diagnosed in 2005 holds "Asperger's" and no level at all. Both are valid. Neither is an upgrade on the other.
Each level is assigned separately across two areas:
So a person can be Level 1 in one and Level 2 in the other, and frequently is. A single number on a report is a summary, not the whole picture.
Critically, the level describes how much support a person needs — not how autistic they are, and not how much they are struggling internally.
Social difficulties that are noticeable without support. Trouble starting conversations, responses that read as unusual, difficulty making and keeping friendships. Inflexibility that interferes with functioning in at least one context. Difficulty switching between activities, and problems with organisation and planning that get in the way of independence.
Often strategies rather than services: workplace adjustments, structure, explicit communication, recovery time. Many adults diagnosed later in life are Level 1.
Marked difficulties in social communication that are apparent even with supports in place. Limited initiation of social interaction, and reduced or unusual responses to others. Inflexibility and difficulty coping with change that is obvious to a casual observer and interferes across contexts. Distress when routines are disrupted.
Ongoing and more structured: regular support with daily living or work, formal accommodations, and frequently NDIS-funded supports.
Severe difficulties in verbal and non-verbal social communication, with very limited initiation of interaction and minimal response to social approaches from others. Extreme difficulty coping with change, and repetitive behaviours that markedly interfere with functioning in all spheres.
Substantial daily support, generally lifelong, usually with significant funded services.
Yes. It can be reassessed, and support needs genuinely shift — a person who copes at Level 1 with a stable job and routine may need substantially more support after burnout, a bereavement or a change in health. The diagnosis does not change; the support need does.
Not always. Many adult reports describe support needs in prose rather than assigning a number, particularly where the purpose is workplace or study adjustments. If a level matters for something specific — an NDIS application, for instance — say so when you enquire, so the report is written to answer it.
The levels are defined in the DSM-5 (American Psychiatric Association, 2013). Australian assessment practice is set out in the National Guideline for the Assessment and Diagnosis of Autism in Australia. Plain-language explanations are also published by Amaze and Aspect.
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