The Autism Diagnostic Observation Schedule – Toddler Module (or ADOS-T; Luyster et al., 2009) is a semi-structured assessment of social engagement, communication, and play using a set of planned “presses” within a naturalistic social interaction. It is intended for children under 30 months of age who have nonverbal mental age of at least 12 months. Other guidelines for use include independent walking and minimal language; once the child masters three-word phrases, the Toddler Module is no longer considered appropriate.
Eleven activities are included in the Toddler Module, along with 41 overall codes. Two algorithms are associated with the module, including one for all children between 12 and 20 months of age and nonverbal children between 21 and 30 months of age and a second algorithm for verbal children between 21 and 30 months of age. These algorithms include formal cutoffs, which are primarily intended for research use and provide binary cl...