Positive behavioral interventions and supports (PBIS; Sugai & Horner, 2006) is an application of multitiered systems of support logic that establishes interventions to address student behavior within the school. PBIS is a popular intervention framework used in more than 20,000 schools across 45 states (Bradshaw, Waasdorp, & Leaf, 2015; Simonsen, Myers, & Briere, 2011). At the Tier 1 level, a school-wide PBIS system is implemented in which all students are taught basic behavioral expectations and are rewarded for meeting those expectations (Sugai & Horner, 2006). At Tier 2, check-in/check-out (CICO; Hawken & Horner, 2003) is perhaps the most common intervention strategy within a PBIS framework (Bruhn, Lane, & Hirsch, 2014; Debnam, Pas, & Bradshaw, 2012) and is thought to bridge the gap between Tier 1 and Tier 3 services (Wolfe et al., 2016). Description of CICO CICO is a mentor-based behavioral intervention that is comprised of five core treatment components. Specifically, CICO includes (a) a daily check-in meeting with an adult, during which behavioral expectations are introduced and defined; (b) the use of a daily progress report (DPR) that the student carries throughout the day to monitor behavior; (c) teacher provided feedback on the DPR about the student's behavior at regularly scheduled intervals; (d) a daily checkout which often includes reinforcement contingent upon appropriate behavior; and (e) home-school communication, typically using the DPR (Crone, Hawken, & Horner, 2010; Mitchell, Adamson, & McKenna, 2017). CICO has been identified as highly effective for reducing problem behavior and somewhat effective for increasing appropriate behavior in recent systematic reviews (e.g., Maggin, Zurheide, Pickett, & Baillie, 2015; Wolfe et al., 2016). Yet, Maggin et al. (2015) and Wolfe et al. (2016) noted that CICO was less effective or ineffective for students whose problem behavior was maintained by a function other than adult attention, a finding that has been reported in previous CICO research. For example, McIntosh, Campbell, Carter, and Dickey (2009) found that CICO produced large, desirable effects on problem behaviors (d = 1.04), office discipline referrals (d = 0.78), and prosocial behavior (d = 0.99) for 778032P BIXXX10.