[caption id="attachment_44299" align="alignleft" width="150" caption="An effective teacher can alter a student's achievement by as much as 50 percentage points."]An effective teacher can alter a student's achievement by as much as 50 percentage points.[/caption]

Under No Child Left Behind, schools are required to make sure every teacher is “highly qualified,” which—according to the law—means teachers must be certified in the subject areas they teach. But amid a growing consensus that “highly qualified” doesn’t necessarily mean “highly effective,” a movement is under way to reshape how the nation views successful teaching.

The effort is particularly relevant...

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