“…Four of these variables were measures of cognitive and linguistic processes associated with individual differences in mathematics development: working memory, listening comprehension, nonverbal reasoning, and processing speed (e.g., Fuchs, Geary, Fuchs, Compton, & Hamlett, 2014;Fuchs, Gilbert, Powell, Cirino, Fuchs, Hamlett, Seethaler, & Tolar;2016;Geary, Bailey, & Hoard, 2009;Swanson & Beebe-Frankenberger, 2004), factors for which increases in arithmetic fluency could plausibly compensate in children's subsequent mathematics learning. The fifth variable, word-reading skill, was included given evidence of developmental parallels between early calculation and word reading (Chu, vanMarle, & Geary, 2016;G€ obel, Watson, Lerv ag, & Hulme, 2014;Koponen, Salmi, Eklund, & Aro, 2013), evidence that students with concurrent math and reading difficulty experience worse outcomes in each area than do peers with difficulty in one domain (Cirino, Fuchs, Elias, Powell, & Schumacher, 2015;Willcutt et al, 2013), and prior evidence that such comorbidity is associated with less adequate response to generally effective intervention (Fuchs, Fuchs, & Prentice, 2004;Fuchs, Geary, et al, 2013). We relied on these same five variables to investigate pathways associated with responsiveness versus unresponsiveness to intervention.…”