Autism Diagnostic Observation Schedule - Second Edition (ADOS-2)

Purpose: To assess and diagnose Autism Spectrum Disorder across age, developmental level and language skills
Age: 1+ years of age
Time: 40-60 minutes

The Autism Diagnostic Observation Schedule 2nd ed. (ADOS-2) is a semi-structured, standardised assessment of communication, social interaction, play, and restricted and repetitive behaviours. By observing and coding these behaviours, you can obtain information that informs diagnosis, intervention, treatment planning, and educational placement.

With updated protocols, revised algorithms, a new Comparison Score, and a Toddler Module, the ADOS-2 provides a highly accurate picture of current symptoms, unaffected by language. It can be used to evaluate almost anyone suspected of having autism spectrum disorder (ASD)—from 1-year-olds with no speech to adults who are verbally fluent.

Each ADOS-2 module has its own Protocol Booklet, which structures the administration and guides clinicians through coding and scoring. As the clinician administers activities, they observe the examinee and take notes. Immediately afterward, the clinician codes the behaviors observed. Then the clinician uses the Algorithm Form for scoring.

In Modules 1–4, algorithm scores are compared with cutoff scores to yield one of three classifications: autism, autism spectrum, or non-spectrum. The difference between autism and autism spectrum classifications is one of severity, with the former indicating more pronounced symptoms.

The Toddler Module is designed specifically for children between 12 and 30 months of age who do not consistently use phrase speech. Toddler Module algorithms provide “ranges of concern” rather than classification scores. These ranges help clinicians form clinical impressions, but the ranges avoid formal classification—which may not be appropriate at such a young age. The Toddler Module quantifies risk for ASD and guides further monitoring.

Please note: Training DVDs are while stocks last.

ADOS-2 administration and coding are highly standardized. Therefore, valid assessment requires training. A variety of training options are available:

1. ADOS-2 Clinical Workshops: Live In-person or online training; These workshops provide instructor-led introductory training on the ADOS-2. Not provided by ACER, please find your local provider
2. ADOS-2 Training Program: Self-study for learning all five modules of the ADOS-2. Available via ACER
   
3. ADOS-2 Training Program Upgrade: Self-study for learning the Toddler Module of the ADOS-2. Available via ACER