Minnesota Public Radio slideshow:
Schools' testing burden grows under new federal law.
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David Heistad, director of research, evaluation and assessment for Minneapolis public schools, says measuring gains is the only fair way to judge schools. (MPR Photo/Tim Pugmire)

David Heistad, director of research, evaluation and assessment for Minneapolis public schools, says measuring gains is the only fair way to judge schools.

(MPR Photo/Tim Pugmire)
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