ADOS-2 is an abbreviation of Autism Diagnostic Observation Schedule, second edition. We use the ADOS-2 in our ASD assessment pathway. It is an observational assessment that takes place in person and which takes around 60 minutes for the clinician to administer. You will work through a series of tasks, some of which may be unusual but which need to be completed to make the assessment valid. It is known internationally as a ‘gold standard’ tool in the assessment and diagnosis of ASD.