MIGDAS-2 vs ADOS-2: How Autism Assessment Tools Differ
11 July 2026 · Hunter Children's Clinics
If your child is being assessed for autism, you may come across the names of different assessment tools. Two that are often mentioned are the MIGDAS-2 and the ADOS-2. This article explains, in plain language, what each one is and how they differ. Neither is presented as better than the other, because the right choice depends on the individual child.
What is the MIGDAS-2?
MIGDAS-2 stands for the Monteiro Interview Guidelines for Diagnosing the Autism Spectrum, second edition. It is a conversational, sensory and interest based framework. Rather than a fixed set of tasks, it guides the clinician through a flexible conversation shaped by the things your child is interested in and how they experience the world through their senses. It gathers information from the child, from parents or carers, and, where relevant, from educators.
What is the ADOS-2?
ADOS-2 stands for the Autism Diagnostic Observation Schedule, second edition. It is a semi structured, standardised observational assessment. It uses a set of planned activities designed to create opportunities for the clinician to observe communication, social interaction and play. The clinician records and scores what they observe against defined criteria.
How they differ
The essence of the difference is what each tool produces. The ADOS-2 is a standardised, structured observation: the clinician guides your child through a set of planned activities and codes what they observe, producing scores that can be compared across children. The MIGDAS-2 is a qualitative, sensory-based framework: rather than a score, it builds a rich, strengths-based description of how your child communicates, relates and experiences the world through their senses, drawing on your child, your family, and often teachers.
Put simply, the ADOS-2 asks "how do this child's behaviours compare on a standardised measure?", while the MIGDAS-2 asks "what is this child's way of experiencing and communicating, described in their own terms?" One is standardised and quantitative; the other is individualised, qualitative and neurodiversity-affirming, describing a child's style and strengths rather than counting difficulties.
That difference in approach matters. Because the MIGDAS-2 centres a child's sensory experience and inner world, it can be especially helpful for children who have learned to mask their differences, who are highly verbal, or whose presentation does not fit the pattern that structured tests were originally built around, situations where a purely behavioural observation, on its own, can miss things. The ADOS-2, in turn, brings the strengths of a standardised, widely-recognised measure.
They are not rivals. Used together, a standardised observation and a sensory, strengths-based profile give a fuller and more accurate picture than either alone, which is why many clinicians value both.
| ADOS-2 | MIGDAS-2 | |
|---|---|---|
| What it is | Standardised, structured observation of set activities | Qualitative, sensory-based interview and observation |
| What it produces | Coded scores that compare across children | A strengths-based written profile, no numeric score |
| Its focus | Observed social-communication behaviours | The child's language, relationships and sensory experience |
| Information from | Direct observation of the child | The child, family and often teachers |
| Often helpful when | A standardised measure is needed | A child masks, is highly verbal, or presents atypically |
Neither tool diagnoses autism on its own. A diagnosis draws together developmental history, information from home and school, and clinical judgement, and the two tools can be used together.
How clinicians choose
An autism assessment is never based on a single tool alone. Clinicians consider the whole picture, including developmental history, information from home and school, and standardised measures. They select the tool, or combination of tools, that best suits the individual child and the questions being asked. At Hunter Children's Clinics, our psychology team uses the MIGDAS-2 where possible, with the ADOS-2 and the Autism Diagnostic Interview, Revised (ADI-R) available where they are clinically indicated, as part of a broader psychology assessment.
What the tools have in common
Despite their differences, both tools share the same goal: to gather good quality information that, alongside history and other measures, helps a clinician reach a sound conclusion. Neither tool diagnoses autism on its own. A diagnosis is a clinical judgement that draws together many sources of information, and the assessment tool is one part of that wider process.
What this means for families
For parents, the practical message is reassuring. You do not need to choose the tool yourself, and you do not need to worry that one label on a form determines the outcome. The clinician makes that decision based on your child, and they can explain their reasoning to you. If you have questions about which approach will be used, it is completely reasonable to ask at the initial consultation. Understanding the process can help both you and your child feel more comfortable going in.
You can read more about our approach on our autism assessment page, and see current fees on our fees and referrals page.
This article is general information only and is not a substitute for individual medical advice. If you have concerns about your child, please speak with your GP or paediatrician.
Related reading: the cost of an autism assessment in Newcastle, and what to expect from a parent-only intake session.
