© 2025 Vista Higher Learning Reading and Writing Growth with Vista’s Engage 10 How We Collected Student Data The district provided SEG Measurement with existing student data files for grades 9–12 ML students. These included: • Fall 2024 AZELLA Placement Test test results (pre-instruction baseline) • Spring 2025 AZELLA test results (post-instruction outcomes) Each record contained a unique student ID, ensuring that results could be matched across testing periods. Student background data, including sex and ethnicity, were also included. All files were reviewed for accuracy and completeness before being merged into a single dataset containing one record per student. This combined file was used to analyze reading and writing growth and subgroup outcomes for the study. Participants The study sample included 171 high school MLs (grades 9–12) who had both pre- and postinstruction AZELLA scores available. This approach allowed for valid, “apples-to-apples” comparisons of student progress across the school year. Performance classifications followed Arizona’s benchmark categories—Pre-Emergent, Emergent, Basic, Intermediate, and Proficient. In most analyses, the first three levels were combined into a single Basic category, consistent with state reporting conventions. To provide statewide context, 2023 AZELLA Technical Manual data were used to compare average reading and writing scores by grade, sex, and race. Because 2024–2025 statewide results had not yet been released, the 2023 data served as a suitable proxy for benchmarking. The study sample included 171 high school MLs … who had both pre- and post-instruction AZELLA scores available. This approach allowed for valid, “apples-to-apples” comparisons of student progress across the school year.
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