<p>It's pretty play based. I'm not sure if you'll be allowed in the room or not (I've not been in the room when DS received the ADOS because parents can influence the child's behavior without meaning too), but I have seen the ADOS being done as well. It's very low pressure. The examiner will have certain toys available (they are specifically chosen for the test) and the examiner will attempt different types of interactions. He'll score your child on answering to his name, themes of free play, how the toys are used, joint attention, and familiar scenarios like eating. </p>