Our results are inherently unpredictable and may be materially affected by many factors, such as fluctuations in foreign exchange rates, changes in global economic conditions and consumer spending, world events, the rate of growth of the Internet and online commerce and the various factors detailed below.

ENGADGET: Amazon posts $21.27 billion in 2012 Q4 revenues, makes tinier profit of $97 million

They are doomed because good teaching is much too complex, and much too affected by too many factors, to be helpfully incentivized by any centrally-planned scorecard.

FORBES: Death To Education Reform