There exist various implementations of Montessori. AMI was founded by Dr. Montessori [0] and certifies schools so that parents can have some assurance of adherence to a standard. The many materials in a Montessori classroom, including things that look like a dollhouse, don't exist for unstructured play but are learning tools for the guide and student to use in their work. Once the student gets a lesson using a material, then they can choose to practice using the material in their self-directed work periods, which can be in groups.
My kids had a mostly positive mixed experience in Montessori. In addition to evaluating how a child comes to grip with the method, there is also how they work with their guide. My observation is that even skilled practitioners don't always achieve a strong rapport with every student. In those situations the Montessori classroom's weakness is that there is only one guide for all subjects as opposed to a traditional school's subject-specific teachers.
0. https://en.wikipedia.org/wiki/Association_Montessori_Interna...
