May 28, 2019
Teachers' effectiveness ripples out beyond their own students and affects the experiences of their pupils' future peers. Ignoring these "spillover" effects underestimates a teacher's value by at least 30 percent.
Although many personal, family, and neighborhood factors contribute to a student's academic performance, a large body of research suggests that—among school-related factors—teachers matter most. RAND researchers examine and evaluate methods of measuring teacher effectiveness, as well as the critical relationship between teacher effectiveness and student achievement.