An estimated 33% of preschool-age children in the United States exhibit challenging behaviors (Rescorla et al., 2011), defined as "any repeated pattern of behavior. .. , that interferes with or is at risk of interfering with optimal learning or engagement in prosocial interactions with peers and adults" (Smith & Fox, 2003, p. 6). Many troublesome behaviors are common among young children, but it is the intensity, frequency, and co-occurrence with other behaviors that distinguish challenging from normal behavior (Campbell, 2002). Without early intervention, challenging behavior in preschool children can evolve into more substantial concerns later in life (Dunlap et al., 2006) and can have a negative effect on the safety and productivity of the learning environment (Carter & Pool, 2012). Teachers need resources to prevent and to extinguish such behaviors (Gilliam, 2005), as well as effective interventions for teaching young children social skills and benefit whole classes and individuals (Dunlap et al., 2006). Positive Behavior Interventions and Supports (PBIS) PBIS is a framework emphasizing the use of praise and reinforcement to support the needs of all students (Sugai et al., 2000). PBIS stresses teaching as the main tool to create comprehensive, durable, and relevant behavior change. Instead of using coercion to modify behavior, PBIS seeks to restructure the learning environment, including teacher behavior. Studies have shown PBIS to be effective in improving individual student behavior as well as the behavior of whole classes (Blair, Fox, & Lentini, 2010; Duda, Dunlap, Fox, Lentini, & Clarke, 2004). Several considerations make implementation of PBIS strategies in early childhood settings uniquely challenging (Frey, Lingo, & Nelson, 2008). Preschools differ from K-12 classrooms in organizational structure, sometimes being part of a larger school environment and sometimes functioning independently. Early childhood educators often receive less training in managing behavior and are less receptive to ideas about rewards and punishments (Frey, Park, Browne-Ferrigno, & Korfhage, 2010). Increased 653226P BIXXX10.