When the company eliminated formal reviews in the 1990s, it didn't replace them with another clear-cut feedback system.

WSJ: Performance Reviews Lose Steam

Under Yang, Lenovo fine-tuned a feedback system that shot detailed sales data back to Lenovo executives in Beijing almost daily.

FORBES: Not East or West

The Facebook ad system is largely self-serve and provides real-time feedback on the size of the target audience and the suggested bid range to achieve impressions.

FORBES: Credits Can Make Facebook Some Serious Coin

Knowing how to identify and measure great teaching is a huge step toward providing better feedback and support for teachers and building a better education system for all our children -- but it's just one step.

CNN: Bill Gates: Invest in better teaching

As them if they really support the idea that a long-term stable natural system can be dominated by extraordinarily high levels of positive feedback.

FORBES: Truthmarket Challenge Demonstrates Everything That Is Wrong With the Global Warming Debate

Ms. Stavney's work as a master teacher is informed by a three-year project our foundation funded to better understand how to build an evaluation and feedback system for educators.

WSJ: Bill Gates on the Importance of Measurement