Impact of Teacher Effectiveness on Student Achievement
The work of Bill Sanders, formerly at the University of Tennessee’s Value-Added Research and Assessment Center, has been pivotal in reasserting the importance of the individual teacher on student learning.4 One aspect of his research has been the additive or cumulative effect of teacher effectiveness on student achievement. Over a multi-year period, Sanders focused on what happened to students whose teachers produced high achievement versus those whose teachers produced low achievement results. He discovered that when children, beginning in 3rd grade, were placed with three high-performing teachers in a row, they scored on average at the 96th percentile on Tennessee’s statewide mathematics assessment at the end of 5th grade. When children with comparable achievement histories starting in 3rd grade were placed with three low-performing teachers in a row, their average score on the same mathematics assessment was at the 44th percentile, an enormous 52-percentile point difference for children who presumably had comparable abilities and skills. Elaborating on this body of research, Dr. Sanders and colleagues reported the following: Continue reading
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