This study examined the efficacy of a supplemental, multicomponent adolescent reading intervention for middle school students who scored below proficient on a state literacy assessment. Using a within-school experimental design, we randomly assigned 483 students in grades 6 to 8 to a business-as-usual control condition or to the Strategic Adolescent Reading Intervention (STARI), a supplemental reading program involving instruction to support word reading skills, fluency, vocabulary and comprehension, and peer talk to promote reading engagement and comprehension. We assessed behavioral engagement by measuring how much of the STARI curriculum activities students completed during an academic school year and we collected intervention teachers' ratings of their students' reading engagement. STARI students outperformed control students on measures of word recognition (d = .20), efficiency of basic reading comprehension (d = .21), and morphological awareness (d = .18). Reading engagement in its behavioral form, as measured by students' participation and involvement in the STARI curriculum, mediated the treatment effects on each of these three posttest outcomes. Intervention teachers' ratings of their students' emotional and cognitive engagement explained unique variance on reading posttests. Findings from this study support the hypothesis that (a) behavioral engagement fosters struggling adolescents' reading growth and (b) teachers' perceptions of their students' emotional and cognitive engagement further contribute to reading competence.Keywords: adolescent literacy, reading intervention, reading engagement, experimental design,
ENGAGING ADOLESCENT READERS 3Engaging Struggling Adolescent Readers to Improve Reading SkillsThe roughly one-quarter of U.S. eighth graders who score below basic on national assessments of reading (NCES, 2015) struggle with the reading demands of secondary school.They are challenged by expectations that they summarize textbook passages, use context to determine word meaning, and make text-based inferences. For many adolescents with reading difficulties, gaps in decoding and fluency compromise basic comprehension (Catts, Compton, Tomblin, & Bridges, 2012;Schatschneider, Fletcher, Francis, Carlson, & Foorman, 2004;Verhoeven & van Leeuwe, 2008). As a consequence, adolescent reading interventions often target word-and sentence-level skills in addition to skills related to meaning construction.Despite calls for increased attention to the needs of struggling adolescent readers (Biancarosa & Snow, 2004; Kamil et al., 2008), however, the impacts of existing multicomponent interventions have often been modest, especially when moved to scale in low performing schools and with teacher, rather than researcher, implementation (Edmonds et al., 2009;Scammacca et al., 2007;Solis, Miciak, Vaughn, & Fletcher, 2014;Wanzek et al., 2013).Student motivation and engagement are frequently cited as barriers to the success of adolescent literacy interventions (Kamil et al., 2008;Manset-Williamson & Nelson, 20...