© 2025 Vista Higher Learning Vista’s Bridges: A Study of Reading Growth in MLs 9 noting that the items are built to measure the reading domains most predictive of secondary-level success in reading and aligned to state standards. The publisher reports robust correlations between mid-year Diagnostic scores and end-ofyear state summative exams. The iReady Reading assessment is reported on a scale ranging from 100–800, covering grades K through 12, and provides an overall score and several subtest scores. However, the subtests are shorter and end up being less reliable. For that reason, this study used the overall language score as the outcome measure. The extent to which students receiving instruction incorporating Bridges not only achieve significant growth in English reading skills, but also achieve significant growth in English reading skills beyond a control group of comparable students receiving instruction using traditional practices, is evidence of Bridges’ e ectiveness. How We Collected Student Data SEG merged the two files from the district to create the files used for data analysis. The files indicated whether students received instruction incorporating Bridges, along with their grade level, sex, ethnicity, race, an indication of whether the student was eligible for free lunch (as an indicator of economic level), and a unique student identifying number. Par cipants We used a matched group sampling model for this study. Given that random sampling is often not possible (as was the case for this study), an alternative is to create matched groups. The sampling model is illustrated in Figure 2. Figure 2 Sampling Approach Popula on (Sampling Pool; All ML Students) Matched Groups (Propensity Score Matching) Final Analy c Sample (A er A ri on)
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