Would transfer right at 6 years old. Montessori is imploding in the primary and secondary areas (http://www.city-data.com/forum/houston/1754438-school-woods-vs-oak-school-montessori-4.html) There is no guidance from Maria Montessori by the time you get into middle and high school. Many of these schools are translating the method for 3 year olds to 8 or 15 year olds with disastrous consequences.