All 50 states and the District of Columbia now are using student achievement or test results to measure school accountability -- an increase from 32 states that were doing so in 2002, according to data from the Education Commission of the States. Data also show that 37 states and D.C. are using growth or improvement for school accountability. There also has been an increase in the number of states issuing letter grades to schools, with 14 now using the practice -- up from one (Florida) in 2002.

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