We could see why Mary Ann is a master teacher, a distinction given to the school's best teachers and an important component of a teacher-evaluation system in Eagle County.

WSJ: Bill Gates on the Importance of Measurement

He said that student-achievement data is only one component of the district's teacher-evaluation system, which relies heavily on principal observations.

WSJ: Seattle Teachers Protest Exams

Another important component to Shah's methodology comes from his firm's strict evaluation standards.

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