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OKLAHOMA CITY - An accountability measure that goes into effect this year has an Oklahoma City charter school facing possible closure.

Changes made to the state's charter school regulations in 2015 included a trigger to close a charter school that finishes in the bottom 5 percent of all Oklahoma schools for three consecutive years. The charter school's sponsor would be required to close the school at the end of its contract or defend its decision to keep the school open to the state Board of Education.

A charter school's ranking is determined by the numerical rating that is assigned with the annual A through F report card. The rating from 2014, 2015 and this year — which is expected to be released later this month — are averaged to determine if a school is in the bottom 5 percent.

Two Oklahoma City charter schools are likely to be bottom 5 percent performers when the ratings are released this month — Justice Alma Wilson SeeWorth Academy and Harper Academy.