Angela WillnerdAngela Willnerd, first grade teacher in Fremont, Nebraska, uses math manipulatives to illustrate effect sizes to her students. The four cubes in her left hand represent the average effect size of .40 from over 250 influences upon student learning. Sh uses this visual to explain that an effect size of .80 is double the learning of a .40, an effect size of 1.20 is triple the learning of a .40 and so on. The 23 cubes in Ms. Willnerd's right hand represent almost six times the average learning from classrooms utilizing the processes explained in How to Create a Perfect School. Read More Read Less