It's important to note that these aren't meant to be done in isolation. The researchers concluded that if educators knew which factors produced the greatest positive gains in student achievement, they could do more of the effective practices and fewer of the negative or ineffective practices. The research produced data on over 250 aspects/actions' impact on student learning in terms of effect size. They called this Visible Learning, what action was observed and the effect size or impact it had on student learning. From this research, they were able to quantify the effect size on learning from each action/evidence on the impact on student learning. John Hattie, Viviane Robinson and a group of educational researchers analyzed data of over 800 meta-analyses from thousands of studies on every aspect of school and instruction. Effective instructional leaders often examine actions within a school through the lens of evidence=impact, what do teachers/students do and what is the impact on student learning.
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