Despite the enthusiasm and the absence of definitive research on the pros and cons of single-sex classes, a 2011 article in Science, titled "The Pseudoscience of Single-Sex Schooling," by a new organization called American Council for CoEducational Schooling (ACCES) came out with the astonishing conclusion that single-sex education is…

Over the past decade, the Gurian Institute has trained more than forty thousand teachers in more than two thousand schools and districts, both coed and single-sex. The institute's trainers have worked with public and private schools, Montessori schools, and a variety of charter and independent schools in fifteen countries; it has therefore been…