© 2025 Vista Higher Learning Reading and Writing Growth with Vista’s Engage 15 Grade 9–12 ML students achieved substantial growth in reading skills after receiving English language instruction incorporating Engage. Writing Growth Results Students also showed statistically significant growth in writing. Average writing scores increased from 205.97 (pre) to 223.09 (post)—a gain of 17.12 points (T=6.9; df=171; p< .001; d=.54). By grade, writing e ect sizes ranged from .39 to .74, with the strongest gains in grade 10 (d=.74). Figure 3 shows steady writing growth from before and after using the program. Writing scores improved substantially across grades following Engage instruction. Change in Proficiency Levels Beyond mean score gains, we examined shifts among AZELLA proficiency categories (Basic, Intermediate, Proficient). A di erent view of growth emerges from examining the proficiency classifications achieved by students and the change in classification following instruction. Students are placed into one of three categories describing their level of proficiency based on the AZELLA results. On the AZELLA scale, ranging from 100 to 500, a score of 250 or above is classified as Proficient. Scores between 100 and 229 are classified as Basic; scores between 230 and 249 are categorized as Intermediate. Figure 3: Average Writing Scores Before and After Engage Instruction Pre Instruction; 205,97 Post Instruction; 223,09 200 205 210 215 220 225 Pre Instruction Post Instruction AZELLA Scaled Score Test Timing Pre Instruction Post Instruction
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