Arne Duncan, U.S. secretary of education, has encouraged school districts to adopt bold strategies to improve the nation's worst-performing high schools, including converting them into charter schools.
Only a handful of districts have chosen the charter option. A recent report from a Washington think tank said Philadelphia and Los Angeles were in the forefront.
"Philadelphia has much to teach the nation," Cynthia Brown, vice president of education policy at the Center for American Progress, said when the center released its report.
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