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'Value-added' formulas strain collaboration

from Education Week

More than half the states now require districts to take student achievement into account when evaluating a teacher's performance. Value-added, or growth, models track individual students' test scores from year to year, which advocates say can help isolate the effect of the instruction that students receive during one school year from their academic backgrounds and prior education experiences. Critics — including many teachers' unions — argue that annual test scores do not give a full picture of student growth, and that the statistical models used for the measures are not designed to evaluate teachers. more

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