The purpose of this study was to evaluate the impact of the Student Success Skills (SSS) school counseling curriculum (Brigman, Campbell, & Webb, 2004; Brigman & Webb, 2012) delivered in a naturalistic setting on students' metacognitive functioning. In this case, the authors use the term naturalistic setting to describe a typical school environment, one which lacks the additional supports (e.g., hiring national trainers) that would be present in a more controlled research study. SSS is an evidence-based, school counselor-delivered, social-emotional learning intervention that is designed to support students by teaching them three integral skill sets: (a) cognitive and metacognitive skills (e.g., goal setting, progress monitoring and memory skills); (b) social skills (e.g., interpersonal skills, social problem solving, listening and teamwork skills); and (c) self-regulation skills (e.g., managing attention, motivation and anger). Research has identified this curriculum as important in promoting students' academic achievement and success in school (Collaborative for Academic, Social, and Emotional Learning, 2015; Webb & Brigman, 2006).SSS was designed based on reviews of educational psychology research literature that identified critical skills such as information processing, emotional self-management, and positive social skills needed for student success (Bransford, Brown, & Cocking, 1999; Durlak, Weissberg, Dymnicki, Taylor, & Schellinger, 2011; Greenberg et al., 2003; Hattie, Biggs, & Purdie, 1996; Marzano, Pickering, & Pollock, 2001; Masten & Coatsworth, 1998; Wang, Haertel, & Walberg, 1994; Zins, Weissberg, Wang, & Walberg, 2004). The curriculum (Brigman & Webb, 2012) can be delivered in two formats: (1) the SSS classroom program and (2) the SSS small group program (Brigman et al., 2004), both of which are intended for use with students in grades 4 through 12. SSS is a highly structured, manualized program that consists of weekly 45-minute lessons. The classroom format includes five lessons, while the small group program includes eight lessons. Both sets of weekly lessons are intended to be delivered in chronological order over the corresponding number of consecutive weeks. A 45-minute booster session is delivered once a month for 3 months in the spring.Developers of SSS designed the curriculum to follow a scripted, manualized format; implementers are encouraged to follow the sequencing, format and language provided in order to ensure fidelity of treatment. If practitioners go off-script or change the recommended delivery of the lessons, it may result in less favorable outcomes that might not meet the same levels as have been found in past research. That being said, the SSS program comes with detailed manuals that include recommended verbiage, descriptive diagrams and supplemental handouts (Brigman & Webb, 2012). During each lesson, students learn and practice strategies in five distinct areas: (a) goal setting, progress monitoring and success sharing; (b) creating a caring, supportive and encouraging classroom environment; (c) cognitive and memory skills; (d) calming skills; and (e) building healthy optimism. Specific strategies are taught and practiced each week and are reviewed and reinforced during subsequent lessons. Between lessons, students are encouraged to apply the new strategies that were taught and to work on the academic and personal goals that they set for themselves during the SSS session. Teachers also are expected to cue students to use the strategies during regular classroom lesson time.Research has established the effectiveness of SSS in several quasi-experimental and experimental studies. SSS implementation has resulted in enhanced academic achievement as measured by standardized achievement tests (Brigman & Campbell, 2003; Brigman, Webb, & Campbell, 2007; C. Campbell & Brigman, 2005; Webb, Brigman, & Campbell, 2005) and district math and reading achievement measures (Lemberger, Selig, Bowers, & Rogers, 2015). …