Co-educational training s. for boys and girls together. The practices were different in different countries and at different times. Mixed education, also known as mixed education, co-ed or coed, is an educational system in which men and women are educated together. While the training of singles was more frequent until the 19th century, mixed sex training became the norm in many cultures, especially in Western countries. However, in many Muslim countries, the training of singles remains widespread. The relative benefits of both systems have been debated. Since the Second World War, co-education has been established in many developing countries; China and Cuba are remarkable examples. There are, however, many other countries where social conditioning and religious sanctions have limited their success.
In most Arab countries, for example, girls at puberty drop out of school. The first co-educational college to be founded was the Oberlin Collegiate Institute in Oberlin, Ohio. December 1833 opened with 44 students, including 29 men and 15 women. Full equality for women did not happen until 1837, and the first three women who obtained a bachelor`s degree did so in 1840.  By the end of the 20th century, many universities, exclusively for people with sex, had become co-educated. The Scottish Dollar Academy was the first day and mixed boarding school in the UK. Founded in 1818, it is the oldest in-house and daytime education centre in the world that still exists. In England, the first non-mixed public boarding school was the Bedales School, founded in 1893 by John Haden Badley and mixed in 1898. The Ruckleigh School in Solihull was founded in 1909 by Cathleen Cartland as a non-denominational co-educational preparation school, before others followed. Many single schools have begun to accept both sexes in recent decades: for example, Clifton College began welcoming girls in 1987.  Hl.