It was a bi-partisan bad idea with flawed assumptions, beginning with the idea that we can use a limited instrument to measure "proficiency." Quote from within:
The biggest downside of the law, she said, was the games that states played with the definition of proficiency.
"By letting every state set their own benchmark, define their own standard and use their own assessment, combined with the requirement of 100 percent proficiency, they basically incented states to keep dumbing down and lowering their cut score in order to get more kids across the bar," Weiss explains. "And that has done a huge disservice to our educational system. Huge."