Over a century of research on peer relationships has revealed that friendships have a special role in young children's development of social competence and are distinctive from the contributions of adults or near-age relatives (Ladd, 2005). Close relationships with peers provide many opportunities for children to develop positive social behaviors, learn conflict-resolution skills, manage strong emotions, and contribute to their perceptions of self, such as self-concept and self-esteem (Ladd, 2005). Conversely, experiences of peer exclusion or bullying can lead to feelings of loneliness, depression, and anxiety. This may be one reason why the attainment of friendships and social interaction skills have been definitively named as critical outcomes of inclusive early childhood programs. For example, the Division for Early Childhood (DEC) and the National Association for the Education for Young Children (NAEYC) wrote a joint position statement on inclusion in 2009. Likewise, the U.S. Department of Health and Human Services (DHHS) and the U.S. Department of Education (ED) in 2015 jointly developed a policy statement on early childhood inclusion in 2015. These statements emphasize that early childhood is a critical period for young children to learn skills necessary to beginning and maintaining friendships. The Division for Early Childhood and National Association for the Education for Young Children (2009) joint position statement on inclusion states that the development of friendships is an outcome of high-quality, inclusive classrooms. In their policy statement, the U.S. Department of Health and Human Services and the U.S. Department of Education (2015) identify friendships with peers as an outcome that should be nurtured within inclusive early childhood environments for every child no matter how mild or severe their disabilities. Likewise, one of the three child outcomes that State Early Intervention and Preschool Special Education programs report to the Office of Special Education Programs (OSEP) refers to children's social-emotional skills and their ability to develop social relationships with both peers and adults (see www.ectacenter.org). The mastery of social-emotional skills is considered a functional outcome for children with disabilities (Odom, McConnell, & McEvoy, 1992). These skills help children participate and succeed in their everyday communities, including home and school environments, ensuring their equal participation and access. As such, a goal of preschool 763543T ECXXX10.