[caption id="attachment_108789" align="alignleft" width="150"] Critics note there is little, if any, evidence that basing evaluations on test scores will improve student achievement, and they argue it is being implemented at a large scale too quickly.[/caption]

One of the key disagreements driving Chicago teachers to the picket lines this week is also a central component of President Barack Obama's education policy: evaluating instructors in part on how much their students improve.

Through its $4 billion Race to the Top competition and No Child Left Behind waivers, the Obama administration has...

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