Beginning this week, Tulsa, Okla., schools will be evaluated using value-added scores that measure students' academic achievement over time. The initiative, funded in part by the Bill & Melinda Gates Foundation, comes as schools statewide prepare to use value-added scores in the 2013-14 school year. District officials say they do not expect the controversy that has surrounded value-added initiatives in other districts, such as Los Angeles, because the local union has been involved in planning.

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