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Montessori materials are NOT toys, but educational materials. Proper use requires appropriate training.
Montessori materials may contain small, rough, sharp, or other elements that could cause injury or damage if used improperly.
It may therefore only be used by children under the supervision of appropriately trained persons and in an appropriate environment.
This book contains a collection of international lectures by Maria Montessori (from the years 1935-1939) on children's rights, on the basics of her pedagogy and didactics, on peace and social education and on the four levels of education from early education through primary school to secondary school to the university.