The ideas from Reddie's Abbotsholme spread to schools such as Bedales School (1893), King Alfred School, London (1898) and St Christopher School, Letchworth (1915), as well as all the Friends' schools, Steiner Waldorf schools and those belonging to the Round Square Conference. The King Alfred School was radical for its time in that it provided a secular education and that boys and girls were educated together.[34] Alexander Sutherland Neill believed children should achieve self-determination and should be encouraged to think critically rather than blindly obeying. He implemented his ideas with the founding of Summerhill School in 1921.