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This policy of random assignment was instituted in 1974 specifically to prevent clustering of students from particular backgrounds at particular schools.In recent decades, many Korean school districts have loosened the policy and they now allow parents to express preferences or to "opt out" of particular schools. In Seoul, it's still a true random assignment with no opt-out.Defenders of same-sex schools hold fast to the belief that girls and boys benefit from separate academic instruction.
The analysis, by Erin Pahlke of Whitman College and Janet Shibley Hyde and Carlie M.
Allison of the University of Wisconsin-Madison, also found "trivial differences" in performance in math and science between the students in co-educational settings and those in single-gender settings in controlled studies.
The prevalence of single-sex public schools has risen and fallen over the years, yet the last decade has seen a major revival.
According to the National Association for Single Sex Public Education, only 34 single-sex public schools were in operation in 2004.
While single-sex schools have their advocates, they have proven controversial and raised questions about their effectiveness.