ProcedureWritten consent and assent was obtained prior to beginning the intake appointment. If the adolescent with ASD met inclusion criteria during the intake, adolescents with ASD and their caregivers completed a variety of self-report measures on social, emotional, and adaptive functioning. Then, at that same appointment, adolescents with ASD and their caregivers were escorted to the laboratory for completion of a physiological assessment. Each adolescent with ASD and caregiver returned to the laboratory for a separate appointment consisting of a 10-min peer interaction with an unfamiliar, gender-matched, typically developing adolescent. Prior to beginning the interaction, the adolescent confederate was instructed to act friendly and naturally with the adolescent with ASD, to convey interest in what the adolescent with ASD said, and to follow the participant’s lead in the conversation. These instructions were given to elicit the most natural and non-contrived interaction as possible. During the consent procedure, the adolescents with ASD were told that they would be interacting with a same-age peer for 10 min as part of the study. When the participants with ASD arrived for their peer interaction appointment, they were reminded that they would ‘‘hang out’’ with a peer similar in age. During this second appointment, participants were escorted to a small, private room where the typically developing adolescent confederate was seated at a table. The adolescent with ASD was directed to sit across from the typically developing confederate. The graduate research assistant introduced the adolescent with ASD to the typically developing confederate and said that the two adolescents could play Jenga, work on a puzzle, and/or chat and hang out for 10 min. A Sony HDRCX330 HD Flash Memory Camcorder (9.2 megapixels) was mounted on a tripod and placed perpendicular and approximately five feet away from the table to record the interactions. The graduate research assistant pressed the record button on the video camera, exited the room, and returned after 10 min. This procedure was repeated at post-test with a different, unfamiliar, typically developing adolescent confederate.