Students at Claremont Academy in Chicago and their scores have become a proof point in a broadening argument between adults and institutions over whether single-sex education does more good than harm, or whether it does any good at all. The battle pits the American Civil Liberties Union and women's groups against some who have been frequent allies…

Opportunity to learn via public education has origins in the mid-nineteenth-century as a response to Horace Mann's argument that educating girls as well as boys would build a collectively more prosperous society. Over the years, educational reform through the judicial and legislative branches of government has continued to balance opportunity to…