Only three of the 11 education interventions have demonstrated statistically significant achievement impact overall in either reading or math. (educationnext.org)
Additionally, findings on student achievement impact in other content areas were mixed, though in many cases were positive in two of the three models used. (leadingeducators.org)
Based on the estimates of variation in teacher quality identified above, Figure 2 shows the overall achievement impact through a cycle of K — 12 instruction. (educationnext.org)