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1909–1915: International recognition and growth of Montessori education

As early as 1909, Montessori's work began to attract the attention of international observers and visitors. Her work was widely published internationally and spread rapidly. By the end of 1911, Montessori education had been officially adopted in public schools in Italy and Switzerland and was planned for the UK. By 1912, Montessori schools had opened in Paris and many other Western European cities, and were planned for Argentina, Australia, China, India, Japan, Korea, Mexico, Switzerland, Syria, the US and New Zealand. Public programs in London, Johannesburg, Rome, and Stockholm had adopted the method in their school systems. Montessori societies were founded in the United States (the Montessori American Committee) and the United Kingdom (the Montessori Society for the United Kingdom). In 1913 the first International Training Course was held in Rome, with a second in 1914.

Montessori's work was widely translated and published during this period. Il Metodo della Pedagogia Scientifica was published in the US as The Montessori Method: Scientific Pedagogy as Applied to Child Education in the Children's Houses, where it became a best seller. British and Swiss editions followed. A revised Italian edition was published in 1913. Russian and Polish editions came out in 1913, and German, Japanese, and Romanian editions appeared in 1914, followed by Spanish (1915), Dutch (1916), and Danish (1917) editions. Pedagogical Anthropology was published in English in 1913. In 1914, Montessori published, in English, Doctor Montessori's Own Handbook, a practical guide to the didactic materials she had developed.