- The Opportunity Scholarship Program (OSP) was a federally-funded school voucher program established in 2003 to provide vouchers of up to $7,500 for low-income students in Washington D.C. to attend private schools. - Early studies of OSP found no statistically significant impact on student achievement in reading or math test scores overall, though some subgroups saw modest gains in reading. - By 2009, funding to OSP was reduced due to a lack of evidence that the program was improving student outcomes overall. The program was phased out, though students already enrolled could continue with vouchers through high school graduation.