ADOS-2 Module 4

This revision improves an instrument already viewed as “the gold standard” for observational assessment of autism spectrum disorder (ASD).

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 ASD from one year olds with no speech, to adults who are verbally fluent.

Like its predecessor, the ADOS-2 is a semi-structured, standardised assessment of communication, social interaction, play, and restricted and repetitive behaviours.

It presents various activities that elicit behaviours directly related to a diagnosis of ASD. By observing and coding these behaviours, you can obtain information that informs diagnosis, treatment planning, and educational placement.

Because it can be used with a wide range of children and adults, the ADOS-2 is an essential addition to any hospital, clinic or school that serves individuals with developmental disorders.

Five Modules

The ADOS-2 includes five modules, each requiring just 40 to 60 minutes to administer. The individual being evaluated is given only one module, selected on the basis of his or her expressive language level and chronological age. Following guidance provided in the manual, you choose the module that’s appropriate for the individual you’re evaluating.

Standardised Administration, Coding, and Scoring

Each ADOS-2 module has its own Protocol Booklet, which structures the administration and guides you thorough coding and scoring. As you administer activities, you observe the examinee and take notes. Immediately afterwards, you code the behaviours observed. Then you use the Algorithm Form for scoring.

In Modules 1 to 4, algorithm scores are compared with cut off scores to yield one of three classifications: Autism, Autism Spectrum, and Non-spectrum. In the Toddler Module, algorithms yield “ranges of concern” rather than classification scores.

Improved Protocol Booklets, Revised Algorithms, and a New Comparison Score

Administration and coding procedures for the ADOS-2 are functionally identical to those for the ADOS. Modules 1 to 4 retain the same basic activities and codes, though some codes have been expanded and several new codes have been added. Protocol Booklets for these modules have been significantly improved – they now provide clearer, more explicit administration and coding instructions.

In the ADOS-2, algorithms for Modules 1 to 3 have been revised to achieve more accurate and useful results. These updated algorithms provide a more uniform basis for comparing results across the three modules that are used with children and young adolescents.

A new Comparison Score for Modules 1 to 3 allows you to compare a child’s overall level of autism spectrum-related symptoms to that of children diagnosed with ASD who are the same age and have similar language skills.  This score also makes it easier to monitor an individual’s symptoms over time


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