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It's also really hard to judge "Montessori" since many schools claim the name but are not accredited by AMI (Association Montessori Internationale) or AMS (American Montessori Society).

This is my biggest complaint about the Montessori schools in our area. It seems like anyone can open one and claim to be Montessori. Most are not accredited but try to get around it by claiming they have teachers accredited by the AMS and AMI. Correct me if I'm wrong but doesn't the school itself need to submit for accreditation?