To assess the degree to which a mand repertoire that was taught to children with autism would generalize from adults to peers, three preschool-aged children diagnosed with Autism were first taught to mand with adult instructors, and then were tested for generalization across three subsequent phases that involved parents, siblings, and peers. Limited generalization of the mand occurred in the parent phase of the study; manding transferred from instructors to parents without direct teaching for all three participants. However, for none of the subjects did manding transfer to interactions with siblings or peers without direct teaching. The results of the study implicate the need to teach children with Autism to mand from a variety of people, especially peers. (Contains 3 figures.)