In 2005, former Assistant Secretary of Education Diane Ravitch wrote, "We should thank President George W. Bush and Congress for passing the No Child Left Behind Act ... All this attention and focus is paying off for younger students, who are reading and solving mathematics problems better than their parents' generation."
Four years later, Ravitch has changed her mind.
"I was known as a conservative advocate of many of these policies," Ravitch says. "But I've looked at the evidence and I've concluded they're wrong. They've put us on the wrong track. I feel passionately about the improvement of public education and I don't think any of this is going to improve public education."