Good question. Since No Child Left Behind we have been in a rut of school reform movements characterized by "one size fits all". Educators and researchers such as Diane Ravitch, who initially supported such corporate-backed educational "reforms" have looked at the results after 10 years and have changed their minds, finding that "one size" simply doesn't fit all children, especially those who are not "average" for one reason or another. I've been opposed to corporate-style accountability since they were introduced in the early 1980s but in the U.S., the business community has more influence than those of us in education.